CGImage载入的图片，查看bitmap详细信息的一段好用代码

在IOS中，载入一张图片到CGImage后，如果想查看图片的信息，这里有一段比较好的代码可以帮助你，其他的信息要显示可以参考苹果的API自己设置！

-(void)imageDump:(NSString*)file{    UIImage* image = [UIImage imageNamed:file];    CGImageRef cgimage = image.CGImage;    size_t width  = CGImageGetWidth(cgimage);    size_t height = CGImageGetHeight(cgimage);    size_t bpr = CGImageGetBytesPerRow(cgimage);    size_t bpp = CGImageGetBitsPerPixel(cgimage);    size_t bpc = CGImageGetBitsPerComponent(cgimage);    size_t bytes_per_pixel = bpp / bpc;    CGBitmapInfo info = CGImageGetBitmapInfo(cgimage);    NSLog(        @"\n"        "===== %@ =====\n"        "CGImageGetHeight: %d\n"        "CGImageGetWidth:  %d\n"        "CGImageGetColorSpace: %@\n"        "CGImageGetBitsPerPixel:     %d\n"        "CGImageGetBitsPerComponent: %d\n"        "CGImageGetBytesPerRow:      %d\n"        "CGImageGetBitmapInfo: 0x%.8X\n"        "  kCGBitmapAlphaInfoMask     = %s\n"        "  kCGBitmapFloatComponents   = %s\n"        "  kCGBitmapByteOrderMask     = %s\n"        "  kCGBitmapByteOrderDefault  = %s\n"        "  kCGBitmapByteOrder16Little = %s\n"        "  kCGBitmapByteOrder32Little = %s\n"        "  kCGBitmapByteOrder16Big    = %s\n"        "  kCGBitmapByteOrder32Big    = %s\n",        file,        (int)width,        (int)height,        CGImageGetColorSpace(cgimage),        (int)bpp,        (int)bpc,        (int)bpr,        (unsigned)info,        (info & kCGBitmapAlphaInfoMask)     ? "YES" : "NO",        (info & kCGBitmapFloatComponents)   ? "YES" : "NO",        (info & kCGBitmapByteOrderMask)     ? "YES" : "NO",        (info & kCGBitmapByteOrderDefault)  ? "YES" : "NO",        (info & kCGBitmapByteOrder16Little) ? "YES" : "NO",        (info & kCGBitmapByteOrder32Little) ? "YES" : "NO",        (info & kCGBitmapByteOrder16Big)    ? "YES" : "NO",        (info & kCGBitmapByteOrder32Big)    ? "YES" : "NO"    );    CGDataProviderRef provider = CGImageGetDataProvider(cgimage);    NSData* data = (id)CGDataProviderCopyData(provider);    [data autorelease];    const uint8_t* bytes = [data bytes];    printf("Pixel Data:\n");    for(size_t row = 0; row < height; row++)    {        for(size_t col = 0; col < width; col++)        {            const uint8_t* pixel =                &bytes[row * bpr + col * bytes_per_pixel];            printf("(");            for(size_t x = 0; x < bytes_per_pixel; x++)            {                printf("%.2X", pixel[x]);                if( x < bytes_per_pixel - 1 )                    printf(",");            }            printf(")");            if( col < width - 1 )                printf(", ");        }        printf("\n");    }}

效果如下：：：

===== a.png =====CGImageGetHeight: 5CGImageGetWidth:  3CGImageGetColorSpace: <CGColorSpace 0x4d08ff0> (kCGColorSpaceDeviceRGB)CGImageGetBitsPerPixel:     32CGImageGetBitsPerComponent: 8CGImageGetBytesPerRow:      20CGImageGetBitmapInfo: 0x00000003  kCGBitmapAlphaInfoMask     = YES  kCGBitmapFloatComponents   = NO  kCGBitmapByteOrderMask     = NO  kCGBitmapByteOrderDefault  = NO  kCGBitmapByteOrder16Little = NO  kCGBitmapByteOrder32Little = NO  kCGBitmapByteOrder16Big    = NO  kCGBitmapByteOrder32Big    = NOPixel Data:(00,00,00,FF), (FF,FF,FF,FF), (FF,00,00,FF), (00,FF,00,FF), (00,00,FF,FF)(00,00,00,FF), (FF,FF,FF,FF), (FF,00,00,FF), (00,FF,00,FF), (00,00,FF,FF)(FF,FF,FF,00), (FF,FF,FF,00), (FF,FF,FF,00), (FF,FF,FF,00), (FF,FF,FF,00)===== b.png =====CGImageGetHeight: 5CGImageGetWidth:  3CGImageGetColorSpace: <CGColorSpace 0x4d08ff0> (kCGColorSpaceDeviceRGB)CGImageGetBitsPerPixel:     24CGImageGetBitsPerComponent: 8CGImageGetBytesPerRow:      15CGImageGetBitmapInfo: 0x00000000  kCGBitmapAlphaInfoMask     = NO  kCGBitmapFloatComponents   = NO  kCGBitmapByteOrderMask     = NO  kCGBitmapByteOrderDefault  = NO  kCGBitmapByteOrder16Little = NO  kCGBitmapByteOrder32Little = NO  kCGBitmapByteOrder16Big    = NO  kCGBitmapByteOrder32Big    = NOPixel Data:(00,00,00), (FF,FF,FF), (FF,00,00), (00,FF,00), (00,00,FF)(00,00,00), (FF,FF,FF), (FF,00,00), (00,FF,00), (00,00,FF)(00,00,00), (FF,FF,FF), (FF,00,00), (00,FF,00), (00,00,FF)