小编and*_*hay的帖子

我想从后台服务捕获屏幕截图.私有API很好,因为我不需要提交到应用商店.我已经尝试过UIGetScreenImage,它无法在后台应用程序中运行.

我正在使用以下来自SO的代码.IOSurfaceCreate给我返回null.任何帮助赞赏.

CFMutableDictionaryRef dict;
        IOSurfaceRef screenSurface = NULL;

        char pixelFormat[4] = {'A','R','G','B'};
        dict = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);

        uint32_t width ;
        uint32_t height;
        void *pitch;
        void *bPE;
        void *size;
        CFDictionarySetValue(dict, kIOSurfaceIsGlobal, kCFBooleanTrue);
        CFDictionarySetValue(dict, kIOSurfaceBytesPerRow, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &pitch));
        CFDictionarySetValue(dict, kIOSurfaceBytesPerElement, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &bPE));
        CFDictionarySetValue(dict, kIOSurfaceWidth, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width));
        CFDictionarySetValue(dict, kIOSurfaceHeight, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height));
        CFDictionarySetValue(dict, kIOSurfacePixelFormat, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, pixelFormat));
        CFDictionarySetValue(dict, kIOSurfaceAllocSize, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &size));

        IOSurfaceRef destSurf = IOSurfaceCreate(dict);
        IOSurfaceAcceleratorRef outAcc;
        IOSurfaceAcceleratorCreate(NULL, 0, &outAcc);

        CFDictionaryRef ed = (__bridge CFDictionaryRef)[NSDictionary dictionaryWithObjectsAndKeys: nil];
        IOSurfaceAcceleratorTransferSurface(outAcc, screenSurface, …