libcurl HTTP 请求将响应保存到变量中 - c++

发布于 2024-08-23 22:36:37 字数 427 浏览 9 评论 0 原文

我正在尝试将 HTTP 请求返回的数据保存到变量中。

下面的代码将自动打印请求的响应，但我需要它将响应保存到字符或字符串。

int main(void)
{
        char * result;
        CURL *curl;
        CURLcode res;
        curl = curl_easy_init();
        if(curl) {
            curl_easy_setopt(curl, CURLOPT_URL, "http://www.browsarity.com/");

            res = curl_easy_perform(curl);
            curl_easy_cleanup(curl);
        }
        return 0;
 }

原文

I'm trying to save the returned data from HTTP request into a variable.

The code below will automatically print the respond of the request, but I need it to save the respond to a char or string.

int main(void)
{
        char * result;
        CURL *curl;
        CURLcode res;
        curl = curl_easy_init();
        if(curl) {
            curl_easy_setopt(curl, CURLOPT_URL, "http://www.browsarity.com/");

            res = curl_easy_perform(curl);
            curl_easy_cleanup(curl);
        }
        return 0;
 }

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孤城病女 2024-08-30 22:36:37

我认为您必须编写一个函数来通过 CURLOPT_WRITEFUNCTION 作为写入回调传递（请参阅这个）。或者，您可以创建一个临时文件并通过 CURLOPT_WRITEDATA 传递其文件描述符（该页面上列出的下一个选项）。然后，您会将临时文件中的数据读回字符串中。这不是最漂亮的解决方案，但至少您不必弄乱缓冲区和函数指针。

编辑：由于您不想写入文件，因此类似这样的方法可能会起作用：

#include <string>

size_t write_to_string(void *ptr, size_t size, size_t count, void *stream) {
  ((string*)stream)->append((char*)ptr, 0, size*count);
  return size*count;
}

int main(void) {
  // ...
  if (curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "http://www.browsarity.com/");

    string response;
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_to_string);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);

    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);

    // The "response" variable should now contain the contents of the HTTP response
  }
  return 0;
}

免责声明：我还没有测试过这个，而且我有点生疏在 C++ 上，但你可以尝试一下。

I think you will have to write a function to pass as a write callback via CURLOPT_WRITEFUNCTION (see this). Alternatively you could create a temporary file and pass its file descriptor via CURLOPT_WRITEDATA (the next option listed on that page). Then you would read back the data from the temporary file into a string. Not the prettiest of solutions, but at least you don't have to mess with buffers and function pointers.

EDIT: Since you don't want to write to a file, something like this might work:

#include <string>

size_t write_to_string(void *ptr, size_t size, size_t count, void *stream) {
  ((string*)stream)->append((char*)ptr, 0, size*count);
  return size*count;
}

int main(void) {
  // ...
  if (curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "http://www.browsarity.com/");

    string response;
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_to_string);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);

    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);

    // The "response" variable should now contain the contents of the HTTP response
  }
  return 0;
}

DISCLAIMER: I haven't tested this, and I'm a bit rusty on C++, but you can try it out.

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人间☆小暴躁 2024-08-30 22:36:37

以下是一个示例 http://code. google.com/p/aws4c/source/browse/trunk/aws4c.c#637。

T.Yates 是对的，你必须创建一个接收数据的函数。并使用 CURLOPT_WRITEFUNCTION 让 CURL 了解您的函数。

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迎风吟唱 2024-08-30 22:36:37

为了使代码更容易理解，我将使用类似这样的 write_to_string 函数。

size_t write_to_string(void *ptr, size_t size, size_t nmemb, std::string stream)
{
  size_t realsize = size * nmemb;
  std::string temp(static_cast<const char*>(ptr), realsize);
  stream.append(temp);
  return realsize;
}

To make the code more understandable, I would have the write_to_string function something like this.

size_t write_to_string(void *ptr, size_t size, size_t nmemb, std::string stream)
{
  size_t realsize = size * nmemb;
  std::string temp(static_cast<const char*>(ptr), realsize);
  stream.append(temp);
  return realsize;
}

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