Question

我试图对图像施加多重影响。 I ve创建了一个单独的档案,处理我可以发送并接收经过修改的副本的效应处理。为了节省处理时间,我首先把图像装入单独的处理档案,并把它储存在记忆中,而不是在我每次想要修改时装上图像。流动量为:获得、开发、改造、开发、展示。一切都持续到最后一步。回归的图像在二分之一的屏幕上显示,然后在X射线上坠毁,有<条码>EXEC_ACCESS:代码1错误。我一再走过这部法典,可以找到问题。任何帮助都受到高度赞赏。谢谢!

www.un.org/spanish/ecosoc 网址:

I m 采用Xcode 4.3.1, 自动参照法

Using Line Breaks, I can verify that the crash happens when the line self.imageView.image = [self.imageManipulation displayImage]; is executed. The image IS updated, but then the program immediately crashes. Using NSZombie, i get an error -[Not A Type retain]: message sent to deallocated instance 0x2cceaf80

从我的角度来看,主计长我使用:

[self.imageManipulation getImageData:self.imageView.image];
[self.imageManipulation modifyRGB];
self.imageView.image = [self.imageManipulation displayImage];

我的图像管理文件包括:

@implementation ImageManipulation
static unsigned char *rgbaDataOld;
static unsigned char *rgbaDataNew;
static int width;
static int height;

- (void)getImageData:(UIImage *)image
{
    CGImageRef imageRef = [image CGImage];

    width = CGImageGetWidth(imageRef);
    height = CGImageGetHeight(imageRef);

    rgbaDataOld = malloc(height * width * 4);
    rgbaDataNew = malloc(height * width * 4);

    NSUInteger bytesPerPixel = 4;
    NSUInteger bytesPerRow = bytesPerPixel * width;
    NSUInteger bitsPerComponent = 8;

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef context = CGBitmapContextCreate(rgbaDataOld, width, height, bitsPerComponent, bytesPerRow, colorSpace, kCGImageAlphaPremultipliedLast | kCGBitmapByteOrder32Big);

    CGContextDrawImage(context, CGRectMake(0, 0, width, height), imageRef);

    CGColorSpaceRelease(colorSpace);
    CGContextRelease(context);
    CGImageRelease(imageRef);
}

//modify rgb values 
- (void)modifyRGB
{
    for (int byteIndex = 0 ; byteIndex < width * height * 4; byteIndex += 4)
    {
        rgbaDataNew[byteIndex] = (char) (int) (rgbaDataOld[byteIndex] / 3) + 1;
        rgbaDataNew[byteIndex+1] = (char) (int) (rgbaDataOld[byteIndex+1] / 3 + 1);
        rgbaDataNew[byteIndex+2] = (char) (int) (rgbaDataOld[byteIndex+2] / 3) + 1;
        rgbaDataNew[byteIndex+3] = (char) (int) 255;
    }    
}

//set image
- (UIImage *)displayImage
{
    CGContextRef context;

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    context = CGBitmapContextCreate(rgbaDataNew, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedLast ); 

    CGImageRef imageRef = CGBitmapContextCreateImage (context);
    UIImage *outputImage = [UIImage imageWithCGImage:imageRef];  

    CGColorSpaceRelease(colorSpace);    
    CGContextRelease(context);  
    CGImageRelease(imageRef);
    return outputImage;
}

@end

Answer 1

我改变了我的dispayImage()方法,以获得UIImageView财产和返回VOID。这样,所有工作都是通过<>UIImageView进行的,而不是局部性的,任何工作都不回过。

我的猜测是,在坠毁之前,我使用的返回UIImage办法,因为所交回的参考线被放在第二位完成的方法上。这也使我得以在没有任何影响的情况下使用。

这里采取的新做法:

- (void)displayImage:(UIImageView *)image { CGContextRef context; CGImageRef imageRef = [image.image CGImage]; CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); context = CGBitmapContextCreate(rgbaDataNew, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedLast ); imageRef = CGBitmapContextCreateImage (context); image.image = [UIImage imageWithCGImage:imageRef]; CGColorSpaceRelease(colorSpace); CGContextRelease(context); CGImageRelease(imageRef); image = nil; }

Thank you to everyone that offered help! I learned a tremendous amount just from your suggestions. This was my first time using bt and NSZombie and now I m using them religiously! Thanks again!

Answer 2

你们释放图像,使UIImage自动释放。

确保你保留“UIImage”,以防止发生此类事件:

- (UIImage *)displayImage
{
    CGContextRef context;

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    context = CGBitmapContextCreate(rgbaDataNew, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedLast ); 

    CGImageRef imageRef = CGBitmapContextCreateImage (context);
    UIImage *outputImage = [[UIImage imageWithCGImage:imageRef] retain]; 

    CGColorSpaceRelease(colorSpace);    
    CGContextRelease(context);  
    CGImageRelease(imageRef); //this line would cause outputImage to be released
    return outputImage;
}

Answer 3

在<代码>上<0>。请通过<_strong将图像保留给编辑人:

UIImage __strong *outputImage = [UIImage imageWithCGImage:imageRef];

或者如果你选择:

__strong UIImage *outputImage = [UIImage imageWithCGImage:imageRef];

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