崩溃CGDataProviderCreateWithCopyOfData：vm_copy失败：状态1 [英] Crash CGDataProviderCreateWithCopyOfData: vm_copy failed: status 1

问题描述

我遇到以下错误而导致的崩溃：

CGDataProviderCreateWithCopyOfData：vm_copy failed：status 1

我有多个问题，您可以帮忙。

1. vm_copy中的状态1代表什么失败？



2. 这个崩溃发生只有当我在数据复制的内循环中设置断点时。然后恢复并删除断点。如果没有断点，函数执行，但我得到一个空白图像。




3. 当我执行CGBitmapContextCreateImage时，会发生此错误。有谁知道如何解决这个问题？

   - （UIImage *）convertBitmapRGBA8ToUIImage：（UInt8 **）img 
：（int）width 
：（int）height 
 {
 
 CGImageRef inImage = m_inFace .img.CGImage; 
 
 UInt8 * piData = calloc（width * height * 4，sizeof（UInt8））; 
 
 int iStep，jStep; 
 for（int i = 0; i  {
 iStep = i * width * 4; 
 for（int j = 0; j< width; j ++）
 {
 jStep = j * 4; 
 piData [iStep + jStep] = img [i] [j]; 
 piData [iStep + jStep + 1] = img [i] [j]; 
 piData [iStep + jStep + 2] = img [i] [j]; 
 
} 
} 
 
 CGContextRef ctx = CGBitmapContextCreate（piData，
 CGImageGetWidth（inImage），
 CGImageGetHeight（inImage），
 CGImageGetBitsPerComponent（inImage），
 CGImageGetBytesPerRow（inImage），
 CGImageGetColorSpace（inImage），
 CGImageGetBitmapInfo（inImage）
）; 
 
 CGImageRef imageRef = CGBitmapContextCreateImage（ctx）; 
 UIImage * finalImage = [UIImage imageWithCGImage：imageRef]; 
 CGContextRelease（ctx）; 
 CGImageRelease（imageRef）; 
 free（piData）; 
 return finalImage; 
 
} 
  

解决方案

a href =http://www.opensource.apple.com/source/xnu/xnu-1456.1.26/osfmk/mach/kern_return.h =nofollow> kern_return.h 头文件：

  #define KERN_INVALID_ADDRESS 1 
 / *指定的地址目前无效。 
 * / 
  

这对应于与 vm_copy相关的错误代码失败：状态1

我怀疑这是一个与内存对齐相关的问题，因为 vm_copy文档说明地址[es]必须在页面边界<

要确保使用正确对齐的缓冲区，您应该使用相同的方式分配 piData 输入图片：

  size_t bytesPerRow = CGImageGetBytesPerRow（inImage ）; 
 UInt8 * piData = calloc（bytesPerRow * height，sizeof（UInt8））; 
  

然后使用 bytesPerRow 循环中的中的code> width * 4 ，即：

  iStep = i * bytesPerRow; 
  

这应该可以解决你的问题（注意：我假设 CGImageGetWidth 和 width 是相同的）。

I am facing a crash with following error:

"CGDataProviderCreateWithCopyOfData: vm_copy failed: status 1."

I have multiple questions and you can help.

1. What does status 1 stand for in vm_copy failed?

2. This crash happens only when I set a break point in the inner for loop of data copy. And then resume and remove the breakpoint. If there is no breakpoint, function executes but I get a blank image. How do I ensure that even if I don't set a break point, such crashes are caught and application stops execution?

3. This error comes when I execute CGBitmapContextCreateImage. Does anyone know how to resolve this?

-(UIImage *) convertBitmapRGBA8ToUIImage:(UInt8**)img 
                                    :(int) width
                                    :(int) height 
{

CGImageRef inImage = m_inFace.img.CGImage;

UInt8*piData = calloc( width*height*4,sizeof(UInt8));

int iStep,jStep;
for (int i = 0; i < height; i++) 
{
    iStep = i*width*4;
    for (int j = 0; j < width; j++) 
    {
        jStep = j*4;
        piData[iStep+jStep] =img[i][j];
        piData[iStep+jStep+1] =img[i][j];
        piData[iStep+jStep+2] = img[i][j];

    }
}

CGContextRef ctx = CGBitmapContextCreate(piData,
                                         CGImageGetWidth(inImage),  
                                         CGImageGetHeight(inImage),  
                                         CGImageGetBitsPerComponent(inImage),
                                         CGImageGetBytesPerRow(inImage),  
                                         CGImageGetColorSpace(inImage),  
                                         CGImageGetBitmapInfo(inImage) 
                                         ); 

CGImageRef imageRef = CGBitmapContextCreateImage(ctx);  
UIImage *finalImage = [UIImage imageWithCGImage:imageRef];
CGContextRelease(ctx);
CGImageRelease(imageRef);
free(piData);
return finalImage;

}

解决方案

The kern_return.h header file gives:

#define KERN_INVALID_ADDRESS        1
  /* Specified address is not currently valid.
   */

This corresponds to the error code related to vm_copy failed: status 1.

I suspect this is a problem related to memory alignment, since the vm_copy documentation states that address[es] must be on a page boundary.

To make sure you work with properly aligned buffers, you should allocate your piData buffer with the same stride than your inImage input image:

size_t bytesPerRow = CGImageGetBytesPerRow(inImage);
UInt8*piData = calloc(bytesPerRow*height,sizeof(UInt8));

Then use this bytesPerRow value instead of width*4 within your for loop, i.e:

iStep = i*bytesPerRow;

This should solve your problem (Note: I assume that CGImageGetWidth(inImage) and width are the same).

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