libcurl下载文件简易demo

size_t test_save(void *ptr, size_t size, size_t nmemb, void *stream)
{
	size_t sizes = size * nmemb;
	DWORD dwHasWritten;
	WriteFile((HANDLE)stream,ptr,sizes,&dwHasWritten,NULL);
	return sizes;
}

int test_get(const char *url, HANDLE hFile)
{
	CURL *pCurl = curl_easy_init();
	int responseCode = -1;
	CURLcode returnCode = CURLE_OK;
	do
	{
		if (!pCurl)
		{
			break;
		}
		returnCode = curl_easy_setopt(pCurl, CURLOPT_CONNECTTIMEOUT, 10); //设置连接超时时间
		CURL_BREAK_IF_NOT_OK(returnCode);

		returnCode = curl_easy_setopt(pCurl, CURLOPT_URL, url);              //设置请求链接
		CURL_BREAK_IF_NOT_OK(returnCode);

		returnCode = curl_easy_setopt(pCurl, CURLOPT_WRITEDATA, hFile);      //设置CURLOPT_WRITEFUNCTION的最后一个参数值
		CURL_BREAK_IF_NOT_OK(returnCode);

		returnCode = curl_easy_setopt(pCurl, CURLOPT_WRITEFUNCTION, test_save); //设置接收到数据之后的回调函数
		CURL_BREAK_IF_NOT_OK(returnCode);

		returnCode = curl_easy_perform(pCurl);                                    //开始传输
		CURL_BREAK_IF_NOT_OK(returnCode);

		returnCode = curl_easy_getinfo(pCurl, CURLINFO_RESPONSE_CODE, &responseCode); //获取返回信息
	} while (0);
	if (pCurl)
	{
		curl_easy_cleanup(pCurl);
	}
	return responseCode;
}

	HANDLE hFile = CreateFileW(L"d:\22.exe", GENERIC_WRITE, FILE_SHARE_WRITE | FILE_SHARE_READ/*|FILE_SHARE_DELETE*/, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
	if (INVALID_HANDLE_VALUE != hFile)
	{
		test_get("http://dldir1.qq.com/qqfile/qq/QQ8.4/18380/QQ8.4.exe", hFile);
	}
	CloseHandle(hFile);
	hFile = NULL;