c++ - 未为 cURL 启用 IDN 支持

Question

我在使用 cURL 将图像放入动态内存缓冲区时遇到了一些问题。

使用的代码如下:

struct memoryStruct {
  char *memory;
  size_t size;
};

static void* CURL_realloc(void *ptr, size_t size)
{
  /* There might be a realloc() out there that doesn't like reallocing
     NULL pointers, so we take care of it here */
  if(ptr)
    return realloc(ptr, size);
  else
    return malloc(size);
}

size_t WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
  size_t realsize = size * nmemb;
  struct memoryStruct *mem = (struct memoryStruct *)data;

  mem->memory = (char *)CURL_realloc(mem->memory, mem->size + realsize + 1);

  if (mem->memory) 
  {
    memcpy(&(mem->memory[mem->size]), ptr, realsize);
    mem->size += realsize;
    mem->memory[mem->size] = 0;
  }

  return realsize;
}




int main()
{
  std::string everything = "https://upload.wikimedia.org/wikipedia/commons/1/1e/Stonehenge.jpg";
  CURL *curl;       // CURL objects
  CURLcode res;
  memoryStruct buffer; // memory buffer

  curl = curl_easy_init(); // init CURL library object/structure

  if(curl) {

        // set up the write to memory buffer
        // (buffer starts off empty)

        buffer.memory = NULL;
        buffer.size = 0;

        // (N.B. check this URL still works in browser in case image has moved)

        curl_easy_setopt(curl, CURLOPT_URL, everything);
        curl_easy_setopt(curl, CURLOPT_VERBOSE, 1); // tell us what is happening

        // tell libcurl where to write the image (to a dynamic memory buffer)

        curl_easy_setopt(curl,CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
        curl_easy_setopt(curl,CURLOPT_WRITEDATA, (void *) &buffer);

        // get the image from the specified URL

        res = curl_easy_perform(curl);


        curl_easy_cleanup(curl);
        free(buffer.memory);

  }
  return 0;
}

作为错误输出，我收到如下错误信息:

但是我不确定是否理解所显示的错误。我的猜测是我应该为 curl 启用 IDN 支持吗？但是我不确定如何进行。这是否意味着我必须在启用 IDN 的情况下重新编译库？ (如果我找到了怎么做)

谢谢你的帮助

Answer 1

您正在将一个 std::string 对象传递给 curl_easy_setopt，而您应该传递一个 C 字符串。它实际上是在尝试解决天知道的问题。

curl_easy_setopt(curl, CURLOPT_URL, everything.c_str());