我正在尝试使用 protobuf 数据在 url 上发出 POST 请求。我不知道如何/在哪里添加二进制数据。下面是我的 C++ 程序。 "
void sendContent()
{
using namespace std;
int Error = 0;
//CString str;
CURL* curl;
CURLcode res;
struct curl_slist *headerlist = NULL;
curl_global_init(CURL_GLOBAL_ALL);
curl = curl_easy_init();
headerlist = curl_slist_append(headerlist, "Content-Type: application/x-protobuf");
//Set URL to recevie POST
curl_easy_setopt(curl, CURLOPT_VERBOSE, true);
curl_easy_setopt(curl, CURLOPT_POST, true);
curl_easy_setopt(curl, CURLOPT_HEADER, true);
curl_easy_setopt(curl, CURLOPT_URL, "http://localhost:9090/info");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
res = curl_easy_perform(curl);
curl_easy_cleanup(curl);
curl_global_cleanup();
}"
最佳答案
您应该通过curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
设置数据指针。同时,您应该通过curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE_LARGE, length_of_data);设置数据大小
。
您可以在 there 中找到 libcurl 发布示例.
然后我复制下面的程序。
#include <stdio.h>
#include <curl/curl.h>
int main(void)
{
CURL *curl;
CURLcode res;
/* In windows, this will init the winsock stuff */
curl_global_init(CURL_GLOBAL_ALL);
/* get a curl handle */
curl = curl_easy_init();
if(curl) {
/* First set the URL that is about to receive our POST. This URL can
just as well be a https:// URL if that is what should receive the
data. */
curl_easy_setopt(curl, CURLOPT_URL, "http://postit.example.com/moo.cgi");
/* Now specify the POST data */
/* size of the POST data */
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE_LARGE, length_of_data);
/* binary data */
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
/* Perform the request, res will get the return code */
res = curl_easy_perform(curl);
/* Check for errors */
if(res != CURLE_OK)
fprintf(stderr, "curl_easy_perform() failed: %s\n",
curl_easy_strerror(res));
/* always cleanup */
curl_easy_cleanup(curl);
}
curl_global_cleanup();
return 0;
}
关于C++:如何通过 curl 调用使用 HTTP post 请求发送二进制数据(protobuf 数据),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59045074/