如何從ImageMagick獲取c緩衝區圖像

Question

我正在使用ImageMagick的iPhone端口。我試圖循環遍歷動畫gif的幀，並將每個幀轉換爲UIImage。我知道我可以用NSData初始化一個UIImage，我可以用一個const void *來初始化它。那麼如何獲得圖像的緩衝區和長度？

下面的代碼：

MagickReadImage(wand, filename); 

     while(MagickHasNextImage(wand)) { 
      Image *myImage = GetImageFromMagickWand(wand); 
      //HELP ME PLEASE 
      const void *myBuff =myImage->blob; //guessing this is the right way to get the buffer? 
      int myLength = ????? //no idea how to get the length 
      NSData *myData = [[NSData alloc] initWithBytes:myBuff length:myLength]; 
      UIImage myImage = [[UIImage alloc] initWithData:myData]]; 
      MagickNextImage(wand); 
    } 

Answer 1

我現在已經解決：

size_t my_size; 
    unsigned char * my_image = MagickGetImageBlob(wand, &my_size); 
    NSData * data = [[NSData alloc] initWithBytes:my_image length:my_size]; 
    free(my_image); 

    UIImage * image = [[UIImage alloc] initWithData:data];