HTTP/HTTPS download demo using WinINet

httpdl.cpp

//WinINet HTTP Get
//http://blog.csdn.net/wzx19840423/article/details/6536342
//HTTPS: https://support.microsoft.com/zh-cn/kb/168151
#include<iostream>
#include<Windows.h>
#include<WinInet.h>
#pragma comment(lib,"WinInet.lib")
int main()
{
	HINTERNET hOpen = InternetOpen(TEXT("KaikiUpdate"), INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);//打开连接，获得Internet句柄
	if (!hOpen)std::cout << "Error InternetOpen.\n";
	HINTERNET hConnect = InternetConnect(hOpen, TEXT("lxfly2000.github.io"), INTERNET_DEFAULT_HTTPS_PORT,
		TEXT(""), TEXT(""), INTERNET_SERVICE_HTTP, 0, 0);//连接，获得连接句柄
	if (!hConnect)std::cout << "Error InternetConnect.\n";
	HINTERNET hReq = HttpOpenRequest(hConnect, TEXT("GET"), TEXT("/Kaiki/update.xml"),
		HTTP_VERSION, TEXT(""), NULL, INTERNET_FLAG_SECURE, 0);//打开请求，获得请求句柄
	if (!hReq)std::cout << "Error HttpOpenRequest.\n";
	BOOL status = HttpSendRequest(hReq, NULL, 0, NULL, 0);//发送
	if (status == FALSE)std::cout << "Error HttpSendRequest.\n";//断网时在这里出错
	char szBuffer[1024] = "";
	DWORD dwByteRead = 0;
	FILE *fp = NULL;
	fopen_s(&fp, "dl.xml", "wb");
	do
	{
		status = InternetReadFile(hReq, szBuffer, ARRAYSIZE(szBuffer), &dwByteRead);
		if (status == FALSE)std::cout << "Error InternetReadFile.\n";
		std::cout << szBuffer;
		fwrite(szBuffer, dwByteRead, 1, fp);
		ZeroMemory(szBuffer, dwByteRead);
	} while (dwByteRead);
	fclose(fp);
	InternetCloseHandle(hReq);
	InternetCloseHandle(hConnect);
	InternetCloseHandle(hOpen);
	return 0;
}