您需要free个字节，因为NSData不拥有它的所有权:它不知道该数组是临时数组还是动态数组，因此它会复制它.

You need to free the bytes, because NSData does not take ownership of it: it cannot know if the array is a temporary or a dynamic, so it makes a copy of it.

要解决此问题，请替换

return [NSData dataWithBytes:bytes length:c];

使用

NSData *res = [NSData dataWithBytes:bytes length:c];
free(bytes);
return res;