CGBitmapContextCreate：无效的数据字节/行

我想在将图像显示回用户之前调整图像大小。

我得到的错误是错误：CGBitmapContextCreate：无效数据字节/行：对于8个整数位/组件，3个组件，kCGImageAlphaNoneSkipFirst应该至少为5504。

我也得到错误：CGContextDrawImage：无效的上下文0x0。

这是我正在使用的代码：

-(UIImage*)imageByScalingToSize:(CGRect)target :(UIImage*)old { UIImage* sourceImage = old; CGFloat targetWidth = target.size.width + 10; CGFloat targetHeight = target.size.height; CGFloat x = target.origin.x; CGFloat y = target.origin.y - 105; CGImageRef imageRef = [sourceImage CGImage]; CGBitmapInfo bitmapInfo = CGImageGetBitmapInfo(imageRef); CGColorSpaceRef colorSpaceInfo = CGImageGetColorSpace(imageRef); if (bitmapInfo == kCGImageAlphaNone) { bitmapInfo = kCGImageAlphaNoneSkipLast; } CGContextRef bitmap; if (sourceImage.imageOrientation == UIImageOrientationUp || sourceImage.imageOrientation == UIImageOrientationDown) { bitmap = CGBitmapContextCreate(NULL, targetWidth, targetHeight, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo); } else { bitmap = CGBitmapContextCreate(NULL, targetHeight, targetWidth, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, bitmapInfo); } if (sourceImage.imageOrientation == UIImageOrientationLeft) { CGContextRotateCTM (bitmap, radians(90)); CGContextTranslateCTM (bitmap, 0, -targetHeight); } else if (sourceImage.imageOrientation == UIImageOrientationRight) { CGContextRotateCTM (bitmap, radians(-90)); CGContextTranslateCTM (bitmap, -targetWidth, 0); } else if (sourceImage.imageOrientation == UIImageOrientationUp) { // NOTHING } else if (sourceImage.imageOrientation == UIImageOrientationDown) { CGContextTranslateCTM (bitmap, targetWidth, targetHeight); CGContextRotateCTM (bitmap, radians(-180.)); } CGContextDrawImage(bitmap, CGRectMake(x, y, targetWidth, targetHeight), imageRef); CGImageRef ref = CGBitmapContextCreateImage(bitmap); UIImage* newImage = [UIImage imageWithCGImage:ref]; CGContextRelease(bitmap); CGImageRelease(ref); return newImage; } 

Answer 1

尝试这个：

 bitmap = CGBitmapContextCreate(NULL, targetWidth, targetHeight, CGImageGetBitsPerComponent(imageRef), 0, colorSpaceInfo, bitmapInfo); 

bitsPerComponent

内存中像素的每个分量使用的位数。 例如，对于32位像素格式和RGB颜色空间，您将为每个组件指定8位的值。 有关支持的像素格式列表，请参阅“Quartz 2D编程指南”的“图形上下文”一章中的“支持的像素格式”。

如果这不能改善，请发布CGImageGetBitsPerComponent(imageRef)和CGImageGetBytesPerRow(imageRef) 。