Inside Macintosh: QuickTime Components
Apple's standard image-compression dialog component fully implements the functional interface for components of this type. As a result, this component allows you to customize the dialog box by enabling the custom button or by defining a filter function. In most cases your application should be able to use the component that is supplied by Apple. However, if you want to create your own standard image-compression dialog component, you should read this section.
Apple has defined a component type value for standard image-compression dialog components. All components of this type have the same type and subtype values. You can use the following constants to specify the type and subtype.
#define StandardCompressionType 'scdi'
#define StandardCompressionSubType 'imag'
Apple has defined a functional interface for standard image-compression dialog components. For information about the functions your component must support, see the next section, "Standard Image-Compression Dialog Components Reference." You can use the following constants to refer to the request codes for each of the functions your component must support.
#define scPositionRect 2 /* SCPositionRect */
#define scPositionDialog 3 /* SCPositionDialog */
#define scSetTestImagePictHandle 4 /* SCSetTestImagePictHandle */
#define scSetTestImagePictFile 5 /* SCSetTestImagePictFile */
#define scSetTestImagePixMap 6 /* SCSetTestImagePixMap */
#define scGetBestDeviceRect 7 /* SCGetBestDeviceRect */
#define scRequestImageSettings 10 /* SCRequestImageSettings */
#define scCompressImage 11 /* SCCompressImage */
#define scCompressPicture 12 /* SCCompressPicture */
#define scCompressPictureFile 13 /* SCCompressPictureFile */
#define scRequestSequenceSettings 14 /* SCRequestSequenceSettings */
#define scCompressSequenceBegin 15 /* SCCompressSequenceBegin */
#define scCompressSequenceFrame 16 /* SCCompressSequenceFrame */
#define scCompressSequenceEnd 17 /* SCCompressSequenceEnd */
#define scDefaultPictHandleSettings 18 /* SCDefaultPictHandleSettings */
#define scDefaultPictFileSettings 19 /* SCDefaultPictFileSettings */
#define scDefaultPixMapSettings 20 /* SCDefaultPixMapSettings */
#define scGetInfo 21 /* SCGetInfo */
#define scSetInfo 22 /* SCSetInfo */
#define scNewGWorld 23 /* SCNewGWorld */