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;