The iPhotoExporter plugin protocols dumped from class-dump can be quite confusing. Here’s some of the things I’ve uncovered while building exporter .

(how to get started building a plugin: http://www.stone.com/The_Cocoa_Files/Writing_PlugIns.html )

ExportPluginProtocol methods

/* This method is called by the exportManager to update the export status sheet.

• Allocate an exportProgress struct (see below) and supply the proper values to
• update the status sheet. *(?) I’m assuming the calling method cleans up your allocated struct, freeing it
• yourself causes a fault. */
• (exportProgress*)progress;

/* Passing YES in your exportProgress from -progress; causes the exportManager to

• subsequently call this method. */
• (void)lockProgress;

/* This method is called when the user clicks “Export” from the export settings pane.

• Here is a good place to call -[exportManager startExport] to drop the export
• status sheet. */
• (void)startExport:(id)fp12;

/* This is called after the export status sheet is dropped. */

• (void)performExport:(id)fp12;

/* Called by clicking “cancel” on the export status sheet */

• (void)cancelExport;

Anonymous Structs (add these to your ExportPluginProtocol.h)

typedef struct { unsigned long progressCount; //progressbar current unsigned long progressTotal; //progressbar total NSString* progressString; //progress message BOOL indeterminant; //progressbar type //locks the progress; will cause -lockProgress; (I don’t know what this is supposed to do) BOOL lockProgress; BOOL isDone; //YES will close the window } exportProgress;

— KelvinNishikawa –