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REALbasic Plug-in Development

Volume Number: 18 (2002)
Issue Number: 07
Column Tag: Getting Started

by Erick J. Tejkowski

REALbasic Plug-in Development

Plugging Made Easy

Introduction

Back in late 1999, we first discussed REALbasic plug-ins in MacTech. Since then, much has changed. REAL Software has released several improvements to the REALbasic plug-in SDK, countless developers have created plug-ins, and lots more plug-in code is out there for you to explore. Because so much has changed, we revisit the topic of REALbasic plug-in development this month. As we did nearly three years ago, we will examine the process of creating plug-ins for REALbasic. We will start with a brief description of the plug-in SDK features. Then, we will prepare the compiler for REALbasic plug-ins. Finally, we will code some plug-in examples so you can see how it all works. In the process, we will discuss what has changed in the SDK during the past three years. If you are completely new to REALbasic plug-in programming, this article should give you a good start on learning the skill.

Plug-in Fundamentals

When we last looked at the REALbasic plug-in SDK in 1999, plug-ins could be compatible either 68K or PPC Macintosh applications. Since then, REAL Software added Microsoft Windows and Macintosh Carbon targets to the list of REALbasic’s abilities. Starting with REALbasic 4, they also removed support for the 68K target. This means that the current REALbasic plug-in SDK supports the creation of PPC, Carbon, and Win32 plug-ins. Each plug-in can contain any combination of these targets, but it must always be compatible with the platform where you are using REALbasic. For example, if you plan to use the plug-in with a Classic version of REALbasic, your plug-in must have a PPC-compatible version for it to work. Likewise, the Carbon version of REALbasic requires a Carbon-compatible version of the plug-in.

A REALbasic plug-in consists of one or more code resources. The following list shows each possible target platform and its corresponding resource name:

  • Carbon – ‘PLCN’
  • PowerPC (PPC) – ‘PLPC’
  • Win32 – ‘PL86’

Plug-in resources start at resource ID #128 and increment from there on. However, you will seldom or never have more than one resource for each target. Thus, most plug-ins that you build will have one resource (#128) for each target (i.e. ‘PLPC’, ‘PLCN’, and ‘PL86’).

The current REALbasic plug-in SDK gives you the ability to create the following items:

  • Classes
  • Class Extensions
  • Controls
  • Functions
  • Database Engines

In this article, we will look at how to implement each of these, except database engines.

Before you embark upon any REALbasic plug-in development, you should first visit REAL Software’s web site and pick up a copy of the latest plug-in SDK. The SDK URL appears at the end of this article in the Bibliography section.

Prepare the Compiler

To begin creating REALbasic plug-ins, you will need a compiler. The tool of choice here is Metrowerk’s CodeWarrior. Since REALbasic plug-ins must contain PEF code resources, Apple’s Project Builder is not suitable for the task. Project Builder can only create Mach-O code.

The easiest way to build a plug-in is to use one of the example projects included with the REALbasic plug-in SDK as a base. If you prefer to start from scratch instead, create a folder in the Finder named “MacTech Plug-in”. Next, open your copy of the REALbasic plug-in SDK and copy the folders named “Glue Code” and “Includes” into the “MacTech Plug-in” folder. Then, launch CodeWarrior.

Create a new project in CodeWarrior using the Mac OS C Stationery. In the resulting New Project dialog that appears, select the Mac OS Toolbox: MacOS Toolbox PPC project stationery as shown in Figure 1.


Figure 1. Choose Mac OS Toolbox PPC Project Stationery to begin building a plug-in

Since a REALbasic plug-in is a code resource, you need to make some changes to the settings of your CodeWarrior project. From the Targets tab, control-click the target named “Classic Toolbox Debug” and select clear from the resulting popup menu. If you based your project on the Classic Toolbox stationery, the remaining target will be named “Classic Toolbox Final”.

Select Classic Toolbox Final Settings from the Edit menu. This displays the settings panels for the current target. In the Target Settings Panel, change the Target Name to “PPC Plug-in”. Next, choose the Access Paths Panel and add a path to the “Includes” folder you copied earlier. Then, select the PPC Target Panel and adjust it to look like Figure 2. Note that the Creator field has changed since we last examined plug-ins in 1999. It is now ‘RBv2’.


Figure 2. PPC Target Settings Panel

Finally, select the PPC Linker Panel and change it to match Figure 3. When you are finished, close the Settings window to return to the Project window.


Figure 3. PPC Linker Panel Settings

If you would like to create targets for Carbon or Win32, consult the REALbasic Plug-in SDK in the “Targeting New Platforms” section. The process works much the same way, but you will need to make a few tweaks specific to each platform.

Again, your best bet for starting out is to use one of the plug-in examples available in the SDK. Those examples have already made the necessary project settings for each platform. Simply copy the folder that contains one of these projects, and rename it to your liking. Once opened, you may want to alter the “Filename” setting in the PPC or X86 Target Panels for each target. You may also need to change the Access Paths Panel to match your directory structure. Other than that, a pre-made plug-in is ready to go and can greatly simplify your life. Use them whenever possible!

Global Methods

By this point, you should have a plug-in project shell that needs some code. As mentioned earlier, we will look at implementing global functions, classes, class extensions, and controls. The plug-in will focus on QuickTime. QuickTime has a large set of functions that are compatible for PPC, Carbon, and Win32. This simplifies matters, because you can often use the same code for multiple targets; even decidedly “Mac-looking” code works with Win32. It is also handy for REALbasic users, because REALbasic does not have some of these QuickTime features.

The simplest construct you can create in a REALbasic plug-in is a global method. Simply create a function as you normally would. For example, Listing 1 shows how to toggle the HighQuality setting of a REALmovie.

Listing 1: Toggle the HighQuality Setting of a REALmovie

SetMoviePlayHintsFunc

static void SetMoviePlayHintsFunc( REALmovie theMovie, Boolean theState)
{
	QT::Movie aMovie;
	
	//get the QT movie from the REALmovie struct
	aMovie = REALgetMovieMovie( theMovie );
	
	//if we have a movie, set it's highQuality on/off
	if (aMovie)
	{
		if (theState)
			SetMoviePlayHints
				(aMovie, hintsHighQuality, hintsHighQuality);
		else
			SetMoviePlayHints(aMovie, 0, hintsHighQuality);
	}

}

Note the REALmovie parameter in the SetMoviePlayHintsFunc function. A REALbasic user will want to pass a REALbasic movie to this function. We must then convert it to a QuickTime movie for use with standard QuickTime API calls. REALgetMovieMovie does this job for us. REALgetMovieMovie is a function provided by the REALbasic Plug-in SDK. The documentation for the Plug-in SDK lists all of the functions that are available to plug-in developers. The bulk of the SDK functions help you to convert back and forth between REALbasic and C/C++ data types and structures.

To let your plug-in know about this function, you must define it using code like that shown in Listing 2.

Listing 2: Define a Global Function

SetMoviePlayHintsMethod 
REALmethodDefinition SetMoviePlayHintsMethod = 
	{ (REALproc) SetMoviePlayHintsFunc, REALnoImplementation, "SetMoviePlayHints(theMovie as Movie, state as Boolean)" };

SetMoviePlayHintsMethod is the name of the REALmethod within the plug-in code. When you call from REALbasic, the SetMoviePlayHintsFunc function in turn is called. The last part of the REALmethodDefinition shows how the call appears to REALbasic users. Choose your phony parameter names carefully here, because they are what appear in the Tips window of REALbasic. Figure 4 shows what the Tips Window looks like when invoked for the SetMoviePlayHints method.


Figure 4. The Tips Window displays a function’s parameter names, but no data types.

The final step in adding a global function to a REALbasic plug-in is to register it. Every REALbasic plug-in has a PluginEntry function. It is here that you register the plug-in’s methods, classes, extensions, and controls. Listing 3 shows how to register the SetMoviePlayHintsMethod via a PluginEntry function.

Listing 3: The PluginEntry Function

The PluginEntry function is the entry point of a plug-in. Here you register the various items (classes, controls, methods, etc..) that you want included in the plug-in. 

void PluginEntry(void)
{
	REALRegisterMethod(&SetMoviePlayHintsMethod);
}

Class Extensions

Global methods are useful and easy to implement, but soon you will discover that they do not fill all of your REALbasic plug-in needs. Suppose, for example, that you wished to add some properties or methods to an existing REALbasic class. The REALbasic Plug-in SDK gives you the means to accomplish a task like this via a Class Extension.

To illustrate Class Extensions, we will add a new property to the MoviePlayer control to permit users to play every frame of a QuickTime movie. The properties are defined in Listing 4.

Listing 4: Define a Class Extension Property

MoviePlayerProperties
REALproperty MoviePlayerProperties[] = {
{ nil, "PlayEveryFrame", "Boolean", 0, (REALproc) GetPlayEveryFrame, (REALproc) SetPlayEveryFrame },
};

This defines a new Boolean property of the MoviePlayer called PlayEveryFrame. The “getter” function for the property is GetPlayEveryFrame, while its “setter” is SetPlayEveryFrame. Listing 5 shows the definition of the setter and getter functions for this new property.

Listing 5: MoviePlayer Class Extension Properties

GetPlayEveryFrame and SetPlayEveryFrame

Set and get the value of Class Extension’s Property with these two functions. 

static Boolean GetPlayEveryFrame(REALmoviePlayer instance, long param)
{
	Boolean everyFrame = false;
	MovieController thePlayer;
	
	thePlayer = REALgetMoviePlayerController(instance);
	MCDoAction
		(thePlayer, mcActionGetPlayEveryFrame, &everyFrame);
	
	return (everyFrame);
		
}

static void SetPlayEveryFrame(REALmoviePlayer instance, long param, Boolean state)
{
	
	MovieController thePlayer;
	
	thePlayer = REALgetMoviePlayerController(instance);
	if (state)
		MCDoAction
			(thePlayer, mcActionSetPlayEveryFrame, (QT::Ptr)true);
	else
		MCDoAction
			(thePlayer, mcActionSetPlayEveryFrame, (QT::Ptr)false);
	
}

Setter and getter functions for properties look like most C functions, but they have a few unique aspects that distinguish them from, say, a global method. First off, getter and setter functions for properties have two requisite parameters. In this example, they are:

REALmoviePlayer instance, long param

The first parameter is the class to which the control belongs. The second parameter (a long) is an extra variable for passing information around the plug-in. We do not use it in this example, but it is required in the function’s definition and prototype. The setter function has an additional parameter, which corresponds to the data type of the REALbasic property being added via the Class Extension.

With the properties declared and the setter/getter functions in place, the next step is to place them into a Class Extension Definition. Listing 6 illustrates the MoviePlayer Class Extension definition.

Listing 6: Defining a Class Extension

MoviePlayerExtension 
REALclassDefinition MoviePlayerExtension = {
	kCurrentREALControlVersion,
	"MoviePlayer",
	nil,
	0,
	0,
	nil,
	nil,
	MoviePlayerProperties,
	sizeof(MoviePlayerProperties) / sizeof(REALproperty),
};
 

A Class Extension uses a reference to a REALclassDefinition structure. The fields of this structure are shown in Listing 7. Each field is optional, but you need to include all fields up to and including the last one you want to use. In our Class Extension, we chose to stop after defining the MoviePlayerProperties, since we do not need any field beyond that.

Listing 7: REALclassDefinition Fields

	1. version the version of the plug-in architecture that the control was built under; 
		just pass the constant kCurrentREALControlVersion
	2. name: the name of the class as used in REALbasic 
	3. superName: the name of the class's superclass; 
		must be a built-in class or a plug-in class registered prior to this one 
    4. dataSize: the size of the custom data structure allocated for each object. 
		NOTE: this data structure must be the same size on all platforms 
		(use padding if necessary)! 
    5. forSystemUse: reserved (set to zero) 
    6. constructor: function to call to initialize your custom data 
    7. destructor: function to call to destroy your custom data 
    8. properties: a reference to the array of property declarations for the class 
    9. propertyCount: the number of properties for the class 
   10. methods: a reference to the array of method declarations for the class 
   11. methodCount: the number of method declarations for the class 
   12. events: a reference to the array of event declarations for the class 
   13. eventCount: the number of event declarations for the class 
   14. eventInstances: a reference to an array of event handlers for the class 
   15. eventInstanceCount: the number of event handlers there are 
   16. interfaces: a comma-delimited string of names of the interfaces 
		supported by this control 
   17. bindDescriptions: a reference to an array of binding descriptions for this control 
   18. bindDescriptionCount: the number of binding descriptions there are

Finally, register the Class Extension as you did with the global method earlier.

PluginEntry v2 
void PluginEntry(void)
{
	REALRegisterMethod(&SetMoviePlayHintsMethod);
	REALRegisterClassExtension(&MoviePlayerExtension);
}

Controls

Class Extensions are limited creatures. Since Class Extensions extend existing structures, you are not permitted to add custom data to them . Classes and Controls, on the other hand, are defined by you, so you can add as much custom data to them as desired. Since Classes and Controls are so closely related, we will limit our discussion to Controls. Any pointers you pick up about Controls will usually carry over to Classes.

To demonstrate how to create a REALbasic Control, we will build a simple viewer for displaying the various images one might fine in a multiple image file. QuickTime supports a few image file formats that allow multiple images in one file. Some of the more popular ones include Photoshop (.psd) and multi-page TIFF (.tif).

The first step is to create a data structure that will store the image being displayed by the control.

MultiImageData 
struct MultiImageData
{
	REALpicture 	theImage;
};

To make sure that the Control redraws correctly, we need to define a Behavior for the Control. The REALbasic Plug-in SDK lists all of the possible behaviors you might include, but we will only concern ourselves with one: redrawFunction, the third field in a Behavior structure. Simply name the function you will use to redraw the Control in the third field when defining the Control’s Behaviors.

MultiImageBehaviour
REALcontrolBehaviour MultiImageBehaviour = {
	nil,			 					// init the control
	nil,								// dispose
	MultiImageDraw	 		// redraw the control
};

Keep in mind that the MultiImageDraw function is responsible for drawing the Control while the REALbasic application runs as well as when it is displayed in a window in the IDE. In the IDE, we will fill in the Control with a blue color. During runtime, we will draw an image (if we have one loaded).

MultiImageDraw
static void MultiImageDraw(REALcontrolInstance instance)
{
	
	QT::Rect myRect;
	short myWidth,myHeight;
	RGBColor fillCol = {0,0,0};
		
	// get a reference to the control's data structure
	ControlData
		(MultiImageControl, instance, MultiImageData, data);
	
	// how big is the control?
	REALGetControlBounds(instance, &myRect);
	 		
	// if we are in the IDE, simply draw 
	// a blue box
	if (!REALinRuntime())
	{
		//fill in the control with blue 
		fillCol.red = 0;
		fillCol.green = 0;
		fillCol.blue = 65535;
		RGBForeColor(&fillCol);
		PaintRect(&myRect);
	}		
	else
	{
		//draw an image, if we are in the Runtime
		myWidth = myRect.right - myRect.left;
		myHeight = myRect.bottom - myRect.top;
		 		
		if (data->theImage)
		{
			REALDrawPicturePrimitive(data->theImage, &myRect, 0);
		}
	}
}

The Control will have two methods to tell us how many images are in a file and to draw a specific image in the Control. Define them as shown in Listing 8:

Listing 8: MultiImageControl Methods

MultiImageMethods, LoadImage, and ImageCountfunc
REALmethodDefinition MultiImageMethods[] = {
	{ (REALproc) LoadImage, REALnoImplementation, "LoadImageFile(FolderItem as FolderItem, pgNum as integer)"},
	{ (REALproc) ImageCountfunc, REALnoImplementation, "ImageCount(FolderItem as FolderItem) as integer" },
};

static void LoadImage
	(REALcontrolInstance instance, 
	REALfolderItem myRF, long pgNum)
{
	//get a reference to the control's data structure
	ControlData
		(MultiImageControl, instance, MultiImageData, data);
	
	int imgCount;
	imgCount = ImageCountfunc(instance, myRF);
	if ( imgCount > 0)
	{
		//get an image based on 1-based index 
		data->theImage = GetImageByIndexfunc(myRF, pgNum);

		//refresh the control's iamge
		MultiImageDraw(instance);

	}
	else
	{
		data->theImage = nil;
	}	
}


static int ImageCountfunc(REALcontrolInstance instance, REALfolderItem myRF)
	{
	//returns image count of a file 
		
		ComponentInstance 	gImporter;
		unsigned long			myCount;
		OSErr							myErr = QT::noErr;
		FSSpec							myFSpec;
	
		myCount = 0;
		ControlData
			(MultiImageControl, instance, MultiImageData, data);
		
		if (!REALFSSpecFromFolderItem(&myFSpec, myRF))
			return;

		myErr = GetGraphicsImporterForFile(&myFSpec, &gImporter);
		if (myErr != QT::noErr) return (myErr);
		myErr = GraphicsImportGetImageCount 
										(gImporter, &myCount);
		if (myErr != QT::noErr) return (32);
		
		if (gImporter != NULL)
			CloseComponent(gImporter);
		return myCount;
		
	}

You might have noticed that these Control functions have a parameter much like the Properties of the Class Extension presented earlier. This is required and gives you access to the instance of the control. This in turn permits you to access the Control’s data structure.

Next, define the control. Again, consult the SDK to see all the possible fields in the REALcontrol structure.

MultiImageControl
REALcontrol MultiImageControl = {
	kCurrentREALControlVersion,
	"MultiImageViewer",              // name of control
	sizeof(MultiImageData),
	0,	// for invisible controls, use: REALinvisibleControl
	128,				// PICT resource for toolbar 
	129,				// PICT resource for toolbar (depressed)
	320, 240,	// the default size of the control 
	nil,				// no properties this time...
	0,					// sizeof(properties)
	MultiImageMethods,	// the methods
	sizeof(MultiImageMethods) / sizeof(REALmethodDefinition),
	nil,				// the events
	0,					// sizeof(events)
	&MultiImageBehaviour
};

Finally, register the Control in the PluginEntry.

REALRegisterControl(&MultiImageControl);

The complete plug-in code is shown in Listing 9.

Listing 9: MacTechPlugin.cpp

// MacTechPlugin.cpp
// Demonstrates a simple REALbasic plug-in 
//
// Targets: Classic, Carbon
//
// REALbasic version used in demo: 4.0.2 
//
// CodeWarrior version used in demo: 6 - 
// Version 7 should also work without any project changes


#include "MacTechPlugin.h"


//**********************
//      GLOBAL METHOD
//**********************

static void SetMoviePlayHintsFunc
			( REALmovie theMovie, Boolean theState )
{
	QT::Movie aMovie;
	
	//get the QT movie from the REALmovie struct
	aMovie = REALgetMovieMovie( theMovie );
	
	//if we have a movie, set it's highQuality on/off
	if (aMovie)
	{
		if (theState)
			SetMoviePlayHints
				(aMovie, hintsHighQuality, hintsHighQuality);
		else
			SetMoviePlayHints(aMovie, 0, hintsHighQuality);
	}

}

//********************************************
//      CLASS EXTENSION - MoviePlayer
//********************************************

REALproperty MoviePlayerProperties[] = {
	{ nil, "PlayEveryFrame", "Boolean", 0, (REALproc) GetPlayEveryFrame, (REALproc) SetPlayEveryFrame },
};

static Boolean GetPlayEveryFrame(REALmoviePlayer instance, long param)
{
	Boolean everyFrame = false;
	MovieController thePlayer;
	
	thePlayer = REALgetMoviePlayerController(instance);
	MCDoAction
		(thePlayer, mcActionGetPlayEveryFrame, &everyFrame);
	
	return (everyFrame);
		
}

static void SetPlayEveryFrame(REALmoviePlayer instance, long param, Boolean state)
{
	
	MovieController thePlayer;
	
	thePlayer = REALgetMoviePlayerController(instance);
	if (state)
		MCDoAction
			(thePlayer, mcActionSetPlayEveryFrame, (QT::Ptr)true);
	else
		MCDoAction
			(thePlayer, mcActionSetPlayEveryFrame, (QT::Ptr)false);
	
}



//********************************************
//		CONTROL  - 	MultiImage viewer 
//		- for image files that might 
//		hold more than one image 
//		(.psd, .tif, etc...)
//********************************************

extern struct REALcontrol MultiImageControl;


struct MultiImageData
{
	REALpicture 	theImage;
};


static void MultiImageDraw(REALcontrolInstance instance)
{
	
	QT::Rect myRect;
	
	short myWidth,myHeight;
	RGBColor fillCol = {0,0,0};
		
	// get a reference to the control's data structure
	ControlData
		(MultiImageControl, instance, MultiImageData, data);
	
	// how big is the control?
	REALGetControlBounds(instance, &myRect);
	 		
	// if we are in the IDE, simply draw 
	// a blue box
	if (!REALinRuntime())
	{

		//fill in the control with blue 
		fillCol.red = 0;
		fillCol.green = 0;
		fillCol.blue = 65535;
		RGBForeColor(&fillCol);
		PaintRect(&myRect);

	}		
	else
	{
		//draw an image, if we are in the Runtime
		myWidth = myRect.right - myRect.left;
		myHeight = myRect.bottom - myRect.top;
		 		
		if (data->theImage)
		{
			REALDrawPicturePrimitive(data->theImage, &myRect, 0);
		}
	}
}

static void LoadImage(REALcontrolInstance instance, REALfolderItem myRF, long pgNum)
{
	//get a reference to the control's data structure
	ControlData
			(MultiImageControl, instance, MultiImageData, data);
	
	int imgCount;
	imgCount = ImageCountfunc(instance, myRF);
	if ( imgCount > 0)
	{
		//get an image based on 1-based index 
		data->theImage = GetImageByIndexfunc(myRF, pgNum);

		//refresh the control's iamge
		MultiImageDraw(instance);

	}
	else
	{
		data->theImage = nil;
	}	
}


//returns image count of a file 
static int ImageCountfunc(REALcontrolInstance instance, REALfolderItem myRF)
	{
		
		ComponentInstance 	gImporter;
		unsigned long				myCount;
		OSErr							myErr = QT::noErr;
		FSSpec							myFSpec;
	
		myCount = 0;

		ControlData
			(MultiImageControl, instance, MultiImageData, data);
		
		if (!REALFSSpecFromFolderItem(&myFSpec, myRF))
			return;

		myErr = GetGraphicsImporterForFile(&myFSpec, &gImporter);
		if (myErr != QT::noErr) return (myErr);
		myErr = GraphicsImportGetImageCount 
										(gImporter, &myCount);
		if (myErr != QT::noErr) return (32);
		
		if (gImporter != NULL)
			CloseComponent(gImporter);
		return myCount;
		
	}


//load an image into the control using 1-based index
static REALpicture GetImageByIndexfunc(REALfolderItem myRF, int indx)
	{
		
		ComponentInstance 	gImporter;
		QT::Rect						myRect;
		unsigned long				myCount, myIndex;
		OSErr							myErr = QT::noErr;
		OSErr							err = QT::noErr;
		FSSpec							myFSpec;
	
	if (!REALFSSpecFromFolderItem(&myFSpec, myRF))
		return;

		myErr = GetGraphicsImporterForFile(&myFSpec, &gImporter);
		if (myErr != QT::noErr) return (REALpicture)NULL;
		myErr = GraphicsImportGetImageCount 
												(gImporter, &myCount);
		if (myErr != QT::noErr) return (REALpicture)NULL;
		
		//loop through all of the layers
		//and look for the one we want
		//(i.e. indx)
		for (myIndex = 1; myIndex <= myCount; myIndex++) 
		{
			if (myIndex == indx)
			{
				myErr = GraphicsImportSetImageIndex
												(gImporter, myIndex);
				if (myErr!=QT::noErr) goto bail;
				GraphicsImportGetNaturalBounds(gImporter, &myRect);
				
				//Do the GWorld stuff
				GWorldPtr world;
				myErr = NewGWorld
									( &world, 8, &myRect, NULL, NULL, 0);
				if (err != QT::noErr) return (REALpicture)NULL;
				
				//set port and draw
				GraphicsImportSetGWorld 
									(gImporter, (CGrafPtr)world, NULL);
				GraphicsImportDraw(gImporter);
				
				if (gImporter != NULL)
					CloseComponent(gImporter);

				return (REALBuildPictureFromGWorld(world, true));
				
			}
			
		}
		
		bail:
		if (gImporter != NULL)
			CloseComponent(gImporter);
		return (REALpicture)NULL;
	}
	

REALclassDefinition MoviePlayerExtension = {
	kCurrentREALControlVersion,
	"MoviePlayer",
	nil,
	0,
	0,
	nil,
	nil,
	MoviePlayerProperties,
	sizeof(MoviePlayerProperties) / sizeof(REALproperty),
	nil,
	0,
	nil,
	0,
};

REALmethodDefinition MultiImageMethods[] = {
	{ (REALproc) LoadImage, REALnoImplementation, "LoadImageFile(FolderItem as FolderItem, pgNum as integer)" },
	{ (REALproc) ImageCountfunc, REALnoImplementation, "ImageCount(FolderItem as FolderItem) as integer" },
};


REALcontrolBehaviour MultiImageBehaviour = {
	nil,			 				// init the control
	nil,							// dispose
	MultiImageDraw	 	// redraw the control
};


REALcontrol MultiImageControl = {
	kCurrentREALControlVersion,
	"MultiImageViewer",        // name of control
	sizeof(MultiImageData),
	0,						
	128,				// PICT resource for toolbar 
	129,				// PICT resource for toolbar (depressed)
	320, 240,			// the default size of the control	nil,		
						// no properties this time...
	0,					// sizeof(properties)
	MultiImageMethods,	// the methods
	sizeof(MultiImageMethods) / sizeof(REALmethodDefinition),
	nil,				// the events
	0,					// sizeof(events)
	&MultiImageBehaviour
};


REALmethodDefinition SetMoviePlayHintsMethod = 
	{ (REALproc) SetMoviePlayHintsFunc, REALnoImplementation, "SetMoviePlayHints(theMovie as Movie, state as Boolean)" };


#pragma mark -
void PluginEntry(void)
{
	
	REALRegisterMethod(&SetMoviePlayHintsMethod);
	REALRegisterClassExtension(&MoviePlayerExtension);
	REALRegisterControl(&MultiImageControl);
	
}

Conclusion

This time we looked at how to build a REALbasic plug-in consisting of a global method, a Class Extension, and a Control. Although we only scratched the surface of plug-in possibilities, this at least gives you a good start for beginning plug-in development. Check the various resources listed in the bibliography if you need more help and above all, happy plugging!

Bibliography

The Internet provides the bulk of information about REALbasic plug-in development. Start at REAL Software’s site and download the latest SDK. Then, sign up for the REALbasic plug-in list. Many talented plug-in programmers frequent the lists and often provide valuable assistance.

REALsoftware
http://www.realsoftware.com
The mother ship... visit here often.

REALbasic Plug-in SDK
http://webster.realsoftware.com/download/release.html
Required visiting! The SDK provides all the files you need to get started programming REALbasic plug-ins.

REALbasic Plug-ins List
http://webster.realsoftware.com/support/internet.html
Need help? Join the REALbasic Plug-ins list and ask away!

Thomas Tempelmann
http://www.tempel.org/rb/index.html
Here you’ll find many great REALbasic plug-in code examples.

REALbasic Plugin Programming
Erick Tejkowski
http://www.mactech.com/articles/mactech/Vol.15/15.10/REALbasicPlugin/index.html
The original MacTech REALbasic plug-in article from 1999.

Erick Tejkowski is the author of REALbasic for Dummies. You can reach him at etejkowski@mac.com.

 

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Software Updates via MacUpdate

Cocktail 8.3.1 - General maintenance and...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
QuarkXPress 11.0.0.0 - Desktop publishin...
With QuarkXPress, you can communicate in all the ways you need to -- and always look professional -- in print and digital media, all in a single tool. Features include: Easy to Use -- QuarkXPress is... Read more
A Better Finder Rename 9.50 - File, phot...
A Better Finder Rename is the most complete renaming solution available on the market today. That's why, since 1996, tens of thousands of hobbyists, professionals and businesses depend on A Better... Read more
PDFpenPro 7.1.1 - Advanced PDF toolkit f...
PDFpenPro allows users to edit PDF's easily. Add text, images and signatures. Fill out PDF forms. Merge or split PDF documents. Reorder and delete pages. Create fillable forms and tables of content... Read more
Garmin Express 4.0.18.0 - Manage your Ga...
Garmin Express is your essential tool for managing your Garmin devices. Update maps, golf courses and device software. You can even register your device. Update maps Update software Register your... Read more
jAlbum Pro 12.6.4 - Organize your digita...
jAlbum Pro has all the features you love in jAlbum, but comes with a commercial license. With jAlbum, you can create gorgeous custom photo galleries for the Web without writing a line of code!... Read more
jAlbum 12.6.4 - Create custom photo gall...
With jAlbum, you can create gorgeous custom photo galleries for the Web without writing a line of code! Beginner-friendly, with pro results Simply drag and drop photos into groups, choose a design... Read more
Microsoft Remote Desktop 8.0.16 - Connec...
With Microsoft Remote Desktop, you can connect to a remote PC and your work resources from almost anywhere. Experience the power of Windows with RemoteFX in a Remote Desktop client designed to help... Read more
Spotify 1.0.4.90. - Stream music, create...
Spotify is a streaming music service that gives you on-demand access to millions of songs. Whether you like driving rock, silky R&B, or grandiose classical music, Spotify's massive catalogue puts... Read more
djay Pro 1.1 - Transform your Mac into a...
djay Pro provides a complete toolkit for performing DJs. Its unique modern interface is built around a sophisticated integration with iTunes and Spotify, giving you instant access to millions of... Read more

Create Your Perfect Vacation Day With Ma...
The Make My Day app, by Lonely Planet, gives you access to a new series of mobile guidebooks that focus on some of the worlds most famous cities. [Read more] | Read more »
Jelly Reef (Games)
Jelly Reef 1.0 Device: iOS Universal Category: Games Price: $1.99, Version: 1.0 (iTunes) Description: You are the ocean. Touch the sea with your fingers and guide jellyfish through a roguelike underwater world. | Read more »
This Week at 148Apps: April 20-24, 2015
The Apps of April How do you know what apps are worth your time and money? Just look to the review team at 148Apps. We sort through the chaos and find the apps you're looking for. The ones we love become Editor’s Choice, standing out above the many... | Read more »
The Dynamic Duo of Tile and Your Apple W...
If you often lose things like your wallet, keys, purse, or pants, Tile could be your new best friend. [Read more] | Read more »
Desktop Dungeons: Enhanced Edition is Co...
Desktop Dungeons, the puzzle roguelike game, is adventuring onto your mobile devices soon, giving you all the excitement of Desktop Dungeons wherever you go. [Read more] | Read more »
Now You Can Control ProCamera 8 With You...
ProCamera 8 + HDR, the photo, video, and editing app by Cocologics, recently updated to add Apple Watch controls and a few other fun functions. [Read more] | Read more »
Discover Your Reflexes With Minimalist G...
Discover O, BYOF Studios, may look simple at first with its' color matching premise and swipe controls, but as you speed up the task becomes more daunting. [Read more] | Read more »
Here's Another Roundup of Notable A...
Now that the Apple Watch is publically available (kind of), even more apps and games have been popping up for it. Some of them are updates to existing software, others are brand new. The main thing is that they're all for the Apple Watch, and if you... | Read more »
Use Batting Average and the Apple Watch...
Batting Average, by Pixolini, is designed to help you manage your statistics. Every time you go to bat, you can use your Apple Watch to track  your swings, strikes, and hits. [Read more] | Read more »
Celebrate Studio Pango's 3rd Annive...
It is time to party, Pangoland pals! Studio Pango is celebrating their 3rd birthday and their gift to you is a new update to Pangoland. [Read more] | Read more »

Price Scanner via MacPrices.net

Sale! New 11-inch 128GB MacBook Air for $799,...
Best Buy has the new 2015 11″ 1.6GHz/128GB MacBook Air on sale for $799.99. That’s $100 off MSRP, and it’s the lowest price available for this new model from any reseller. Choose free home shipping... Read more
Final day for Best Buy’s 4 Day Sale: Up to $3...
Best Buy has the new 2015 13″ 1.6GHz/128GB MacBook Air on sale for $799.99 through April 27th. That’s $200 off MSRP, and it’s the lowest price available for this new model from any reseller. Choose... Read more
College Student Deals: Additional $50 off Mac...
Take an additional $50 off all MacBooks and iMacs at Best Buy Online with their College Students Deals Savings, valid through May 9, 2015. Anyone with a valid .EDU email address can take advantage of... Read more
Save up to $300 on a new Mac, $30 on an iPad,...
Purchase a new Mac or iPad at The Apple Store for Education and take up to $300 off MSRP. All teachers, students, and staff of any educational institution qualify for the discount. Shipping is free,... Read more
Zoho Business Apps for Apple Watch Put Select...
Pleasanton, California based Zoho has launched Zoho Business Apps for Apple Watch, a line of apps that extends Zoho business applications to let users perform select functions from an Apple Watch.... Read more
Universal Stylus Initiative Launched to Creat...
OEMs, stylus and touch controller manufacturers have announced the launch of Universal Stylus Initiative (USI), a new organization formed to develop and promote an industry specification for an... Read more
Amazon Shopping App for Apple Watch
With the new Amazon shopping app for Apple Watch, Amazon customers with one of the wearable devices can simply tap the app on the watch to purchase items in seconds, or save an idea for later. The... Read more
Mac Pros on sale for up to $260 off MSRP
B&H Photo has Mac Pros on sale for up to $260 off MSRP. Shipping is free, and B&H charges sales tax in NY only: - 3.7GHz 4-core Mac Pro: $2799, $200 off MSRP - 3.5GHz 6-core Mac Pro: $3719.99... Read more
Apple refurbished Time Capsules available for...
The Apple Store has certified refurbished Time Capsules available for $100 off MSRP. Apple’s one-year warranty is included with each Time Capsule, and shipping is free: - 2TB Time Capsule: $199, $100... Read more
Intel Compute Stick: A New Mini-Computing For...
The Intel Compute Stick, a new pocket-sized computer based on a quad-core Intel Atom processor running Windows 8.1 with Bing, is available now through Intel Authorized Dealers across much of the... Read more

Jobs Board

*Apple* Support Technician IV - Jack Henry a...
Job Description Jack Henry & Associates is seeking an Apple Support Technician. This position while acting independently, ensures the proper day-to-day control of Read more
*Apple* iOS Specialist - TCML (United States...
AppleiOS Specialist Senior Apple /iOS Administrator/Engineer responsible for configuration and distribution of desktop, laptop and mobile devices to State Employees Read more
*Apple* Client Systems Solution Specialist -...
…drive revenue and profit in assigned sales segment and/or region specific to the Apple brand and product sets. This person will work directly with CDW Account Managers Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Support Technician IV - Jack Henry a...
Job Description Jack Henry & Associates is seeking an Apple Support Technician. This position while acting independently, ensures the proper day-to-day control of Read more
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