Question

This code used to work, however I think Xcode s new ARC may have killed it

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    CGDirectDisplayID displayID = CGMainDisplayID();
    CGImageRef image = CGDisplayCreateImage(displayID); //this is a screenshot (works fine)
    [self savePNGImage:image path:@"~/Desktop"];
}


-(void)savePNGImage:(CGImageRef)imageRef path:(NSString *)path {
    NSURL *outURL = [[NSURL alloc] initFileURLWithPath:path]; 
    //here xcode suggests using __bridge for CFURLRef?
    CGImageDestinationRef dr = CGImageDestinationCreateWithURL ((__bridge CFURLRef)outURL, (CFStringRef)@"public.png" , 1, NULL);    
    CGImageDestinationAddImage(dr, imageRef, NULL);
    CGImageDestinationFinalize(dr);
}

该法典将错误归为:

ImageIO: CGImageDestinationAddImage image destination parameter is nil

我假设的是,CGImageDestinationRef不是正在正确创建的。我没有能够发现这一点,即新的X条码并没有给我留下同样的错误,而我是错了吗?

Answer 1

您颁布的法典要么与阿农研中心合作,要么与阿农研中心合作,要么与非阿农研中心合作,因为你需要在路面上扩大til,然后再通过。

您所贴出的代码也泄露了通过<>CGDisplayCreateImage和CGImageDestinationCreateWithURL归还的物品。这里的一个例子是,该例子能够奏效,并且确实有漏漏:

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    CGDirectDisplayID displayID = CGMainDisplayID();
    CGImageRef imageRef = CGDisplayCreateImage(displayID); //this is a screenshot (works fine)

    NSString *path = [@"~/Desktop/public.png" stringByExpandingTildeInPath];
    [self savePNGImage:imageRef path:path];

    CFRelease(imageRef);
}

- (void)savePNGImage:(CGImageRef)imageRef path:(NSString *)path
{
    NSURL *fileURL = [NSURL fileURLWithPath:path]; 
    CGImageDestinationRef dr = CGImageDestinationCreateWithURL((__bridge CFURLRef)fileURL, kUTTypePNG , 1, NULL);

    CGImageDestinationAddImage(dr, imageRef, NULL);
    CGImageDestinationFinalize(dr);

    CFRelease(dr);
}

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