如何从ImageMagick Image获取c缓冲区 [英] How to get c buffer from ImageMagick Image

问题描述

我使用ImageMagick的iPhone端口。我试图循环通过动画gif的帧，并将每个帧转换为UIImage。我知道我可以初始化一个UIImage与NSData，我可以初始化一个const void *。那么如何获得缓冲区和图像的长度？

这里是代码：

  MagickReadImage（wand，filename）; 
 
 while（MagickHasNextImage（wand））{
 Image * myImage = GetImageFromMagickWand（wand）; 
 // HELP ME PLEASE 
 const void * myBuff = myImage-> blob; //猜测这是正确的方式获取缓冲区？ 
 int myLength = //不知道如何获取长度
 NSData * myData = [[NSData alloc] initWithBytes：myBuff length：myLength]; 
 UIImage myImage = [[UIImage alloc] initWithData：myData]]; 
 MagickNextImage（wand）; 
} 
  

解决方案现在我有解决方案：

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

I'm using the iPhone port of ImageMagick. I'm trying to loop through the frames of an animated gif and turn each frame into an UIImage. I know I can init a UIImage with NSData which I can init with a const void *. So how to I get the buffer and length of the image?

Here's the code:

    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);
    }

解决方案

I have the solution now:

    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];

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