I'm putting together some code that will write an icon file (obtained
via NSWorkspace) to a gif.
I had prototyped the code with a simple command-line tool with
hard-coded values for file sources, destinations, and image sizes.
However, when I try to abstract the code, I am now getting weird error
messages:
<Error>: CGImageCreate: invalid image size: 0 x 0.
2009-03-13 10:40:48.805 Wish[20760:10b] Could not create CGImageRef -
w:0, h:0, bps:8, bpp:32, bpr:512, alpha:0x1,
cSpace:NSCalibratedRGBColorSpace, hasAlpha:1, isPlanar:0
Fri Mar 13 10:40:48 Macintosh.local Wish[20760] <Error>:
CGImageDestinationFinalize image destination does not have enough images
CGImageDestinationFinalize failed for output type 'com.compuserve.gif'
objc[20760]: FREED(id): message release sent to freed object=0x466430
The basic code is below:
-(int) makeIcon: (NSString *) filePath imagewidth: (float) width
imageheight: (float)height outputfile:(NSString *)imagePath {
NSApplicationLoad();
//set up autorelease pool
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
//retrieve the icon
NSImage *icon = [[NSWorkspace sharedWorkspace] iconForFile:filePath];
//get bitmap representation of icon
NSBitmapImageRep *resizeicon = (NSBitmapImageRep *)[icon
bestRepresentationForDevice:nil];
//set the icon size
[resizeicon setSize:NSMakeSize(width, height)];
[resizeicon setPixelsWide: width];
[resizeicon setPixelsHigh:height];
//convert icon to gif, write to file
[[resizeicon representationUsingType:NSGIFFileType properties:nil]
writeToFile:imagePath atomically:NO];
//release memory
[icon release];
[resizeicon release];
[pool release];
return 0;
}
The prototype code, below, actually works as designed, so I'm not sure
what the problem is. Any advice is appreciated.
#import <Cocoa/Cocoa.h>
int main (int argc, char *argv[]) {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSImage *icon = [[NSWorkspace sharedWorkspace]
iconForFile:@"/Applications/AppKiDo.app"];
NSBitmapImageRep *resizeicon = (NSBitmapImageRep *)[icon
bestRepresentationForDevice:nil];
[resizeicon setSize:NSMakeSize(48.0, 48.0)];
[resizeicon setPixelsWide:48.0];
[resizeicon setPixelsHigh:48.0];
[[resizeicon representationUsingType:NSGIFFileType properties:nil]
writeToFile:@"/Users/kevin/Desktop/bar.gif" atomically:NO];
[pool release];
return 0;
}
Thanks....
--
Kevin Walzer
Code by Kevin
http://www.codebykevin.com
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