如何將CGImageRef寫入png文件。 CGImageDestinationCreateWithURL返回nil

Question

- (void)takeScreenShot { 
    CGImageRef screenShot = CGWindowListCreateImage(CGRectInfinite, kCGWindowListOptionOnScreenOnly, kCGNullWindowID, kCGWindowImageDefault); 
    CGImageWriteToFile(screenShot, [@"~/code/screenshot.png" stringByExpandingTildeInPath]); 
} 

BOOL CGImageWriteToFile(CGImageRef image, NSString *path) { 
    CFURLRef url = (__bridge CFURLRef)[NSURL fileURLWithPath:path]; 
    CGImageDestinationRef destination = CGImageDestinationCreateWithURL(url, kUTTypePNG, 1, NULL); 
    if (!destination) { 
     NSLog(@"Failed to create CGImageDestination for %@", path); 
     return NO; 
    } 

    CGImageDestinationAddImage(destination, image, nil); 

    if (!CGImageDestinationFinalize(destination)) { 
     NSLog(@"Failed to write image to %@", path); 
     CFRelease(destination); 
     return NO; 
    } 

    CFRelease(destination); 
    return YES; 
} 

無法爲 創建CGImageDestination /Users/"username"/Library/Containers/"bundleidentifier"/Data/code/screenshot.png

所以沒有返回目的地。 最好我想寫〜/ code/screenshot.png，但如果它是沙盒的東西，也可以寫入「沙箱」

如何將屏幕截圖寫入一個我可以稍後訪問的文件？

我從Saving CGImageRef to a png file?

Answer 1

@import MobileCoreServices; // or `@import CoreServices;` on Mac 
@import ImageIO; 

BOOL CGImageWriteToFile(CGImageRef image, NSString *path) { 
    CFURLRef url = (__bridge CFURLRef)[NSURL fileURLWithPath:path]; 
    CGImageDestinationRef destination = CGImageDestinationCreateWithURL(url, kUTTypePNG, 1, NULL); 
    if (!destination) { 
     NSLog(@"Failed to create CGImageDestination for %@", path); 
     return NO; 
    } 

    CGImageDestinationAddImage(destination, image, nil); 

    if (!CGImageDestinationFinalize(destination)) { 
     NSLog(@"Failed to write image to %@", path); 
     CFRelease(destination); 
     return NO; 
    } 

    CFRelease(destination); 
    return YES; 
} 

適應代碼你要的ImageIO和MobileCoreServices添加到您的項目，也必須添加標題。