截图代码

static void savePNGImage(CGImageRef imageRef, NSString *path)

1. {
2. NSURL *fileURL = [NSURL fileURLWithPath:path];
3. CGImageDestinationRef dr = CGImageDestinationCreateWithURL(( CFURLRef)fileURL, kUTTypePNG , 1, NULL);
4. CGImageDestinationAddImage(dr, imageRef, NULL);
5. CGImageDestinationFinalize(dr);
6. CFRelease(dr);
7. }
8. static void save()
9. {
10. CGDirectDisplayID displayID = CGMainDisplayID();
11. CGImageRef imageRef = CGDisplayCreateImage(displayID);
12. NSString *path = [@"~/Desktop/public.png" stringByExpandingTildeInPath];
13. NSLog(@"save file: %@", path);
14. savePNGImage(imageRef, path);
15. CFRelease(imageRef);
16. }

按钮点击　调用　

1. -(IBAction) btnScreenShot:(id) sender{
2. printf("screen short start\n");
3. save();
4. }

关联事件后，触发后，　将在桌面保存　png　桌面截图