Is it possible to print IKImageBrowserView In Cocoa programmatically? - cocoa

Question

I want to take print of IKImageBrowserView with (content) images. I tried the following code
if (code == NSOKButton) {
NSPrintInfo *printInfo;
NSPrintInfo *sharedInfo;
NSPrintOperation *printOp;
NSMutableDictionary *printInfoDict;
NSMutableDictionary *sharedDict;
sharedInfo = [NSPrintInfo sharedPrintInfo];
sharedDict = [sharedInfo dictionary];
printInfoDict = [NSMutableDictionary dictionaryWithDictionary: sharedDict];
[printInfoDict setObject:NSPrintSaveJob
forKey:NSPrintJobDisposition];
[printInfoDict setObject:[sheet filename] forKey:NSPrintSavePath];
printInfo = [[NSPrintInfo alloc] initWithDictionary:printInfoDict];
[printInfo setHorizontalPagination: NSAutoPagination];
[printInfo setVerticalPagination: NSAutoPagination];
[printInfo setVerticallyCentered:NO];
printOp = [NSPrintOperation printOperationWithView:imageBrowser
printInfo:printInfo];
[printOp setShowsProgressPanel:NO];
[printOp runOperation];
}
because IKImageBrowserView is Inherits from NSView but print preview is showing null image. Please help me to over come this problem. Thanks in advance.....

Answer 1

/*
1) allocate a c buffer at the size of the visible rect of the image
browser
*/
NSRect vRect = [imageBrowser visibleRect];
NSSize size = vRect.size;
NSLog(#"Size W = %f and H = %f", size.width, size.height);
void *buffer = malloc(size.width * size.height * 4);
//2) read the pixels using openGL
[imageBrowser lockFocus];
glReadPixels(0,
0,
size.width,
size.height,
GL_RGBA,
GL_UNSIGNED_BYTE,
buffer);
[imageBrowser unlockFocus];
//3) create a bitmap with those pixels
unsigned char *planes[2];
planes[0] = (unsigned char *) (buffer);
NSBitmapImageRep *imageRep = [[NSBitmapImageRep alloc]
initWithBitmapDataPlanes:planes pixelsWide:size.width
pixelsHigh:size.height bitsPerSample:8 samplesPerPixel:4 hasAlpha:YES
isPlanar:NO colorSpaceName:NSDeviceRGBColorSpace bitmapFormat:0
bytesPerRow:size.width*4 bitsPerPixel:32];
/*
4) create a temporary image with this bitmap and set it flipped
(because openGL and the AppKit don't have the same pixels coordinate
system)
*/
NSImage *img = [[NSImage alloc] initWithSize:size];
[img addRepresentation:imageRep];
[img setFlipped:YES];
[imageRep release];
/*
5) draw this temporary image into another image so that we get an
image without any reference to our "buffer" buffer so that we can
release it after that
*/
NSImage *finalImage = [[NSImage alloc] initWithSize:size];
[finalImage lockFocus];
[img drawAtPoint:NSZeroPoint
fromRect:NSMakeRect(0,0,size.width,size.height)
operation:NSCompositeCopy fraction:1.0];
[finalImage unlockFocus];
//[NSString stringWithFormat:#"/tmp/%#.tiff", marker]
NSData *imageData = [finalImage TIFFRepresentation];
NSString *writeToFileName = [NSString stringWithFormat:#"/Users/Desktop/%#.png", [NSDate date]];
[imageData writeToFile:writeToFileName atomically:NO];
//6) release intermediate objects
[img release];
free(buffer);
After this I send imageData for print, which works great for me.