使用curl库，以post方式向服务器发送json数据

//使用curl库，以post方式向服务器发送json数据
//json数据的组合可以参考jsoncpp库，也可以按json格式自己组合字符串

//注意事项，以下代码不可以多线程执行，如果多线程执行，需要加锁进行控制，否则会运行崩溃

#include <curl/curl.h>
#include <string>
#include <exception>

int main(int argc, char *argv[]) 
{
	char szJsonData[1024];
	memset(szJsonData, 0, sizeof(szJsonData));
	std::string strJson = "{";
	strJson += "\"user_name\" : \"test\",";
	strJson += "\"password\" : \"test123\"";
	strJson += "}";
	strcpy(szJsonData, strJson.c_str());
	try 
	{
		CURL *pCurl = NULL;
		CURLcode res;
		// In windows, this will init the winsock stuff
		curl_global_init(CURL_GLOBAL_ALL);

		// get a curl handle
		pCurl = curl_easy_init();
		if (NULL != pCurl) 
		{
			// 设置超时时间为1秒
			curl_easy_setopt(pCurl, CURLOPT_TIMEOUT, 1);

			// 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(pCurl, CURLOPT_URL, "http://192.168.0.2/posttest.svc");
			//curl_easy_setopt(pCurl, CURLOPT_URL, "http://192.168.0.2/posttest.cgi");

			// 设置http发送的内容类型为JSON
			curl_slist *plist = curl_slist_append(NULL, 
				"Content-Type:application/json;charset=UTF-8");
			curl_easy_setopt(pCurl, CURLOPT_HTTPHEADER, plist);

			// 设置要POST的JSON数据
			curl_easy_setopt(pCurl, CURLOPT_POSTFIELDS, szJsonData);

			// Perform the request, res will get the return code 
			res = curl_easy_perform(pCurl);
			// Check for errors
			if (res != CURLE_OK) 
			{
				printf("curl_easy_perform() failed:%s\n", curl_easy_strerror(res));
			}
			// always cleanup
			curl_easy_cleanup(pCurl);
		}
		curl_global_cleanup();
	}
	catch (std::exception &ex)
	{
		printf("curl exception %s.\n", ex.what());
	}
	return 0;
}

参考文档curl压缩包\docs\examples\http-post.c

curl压缩包下载地址：http://curl.haxx.se/download.html