C++ http请求

实例 代码

#include "stdafx.h"
#include <stdio.h>
#include <windows.h>
#include <wininet.h>
#include <iostream>
#include <string>
using namespace std;

#define MAXSIZE 1024
#pragma comment(lib, "Wininet.lib") 


bool  Urlopen(const _TCHAR* url, BYTE *&urlContent)
{
	HINTERNET hSession = InternetOpen(_T("UrlTest"), INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
	if(hSession != NULL)
	{
		HINTERNET hHttp = InternetOpenUrl(hSession, url, NULL, 0, INTERNET_FLAG_DONT_CACHE, 0);
		if (hHttp != NULL)
		{
			urlContent = new (std::nothrow) BYTE[MAXSIZE];
			if(NULL == urlContent)
			{
				return false;
			}
			memset(urlContent, 0, MAXSIZE);
			ULONG Number = 1;

			bool bInternetReadFile = false;

			bInternetReadFile = InternetReadFile(hHttp, urlContent, MAXSIZE - 1, &Number);
			if(!bInternetReadFile)
			{
				return false;
			}

			if(Number <= 0 || Number >= <span style="font-family: Arial, Helvetica, sans-serif;">MAXSIZE</span>)
			{
				return false;
			}

			urlContent[Number] = '\0';

			InternetCloseHandle(hHttp);
			hHttp = NULL;

			return true;
		}
		InternetCloseHandle(hSession);
		hSession = NULL;
	} 

	return false;
}

int _tmain(int argc, _TCHAR* argv[])
{
	wstring wstr = _T("http://120.25.242.254/WxService/test?UserId=niebingyu&OrgCode=YUTONGXUN5.0");

	BYTE* byte = NULL;
	
	bool bUrlopen = false;
	bUrlopen = Urlopen(wstr.c_str(), byte);
	if(NULL == byte)
	{
		cout<<"byte is NULL"<<endl;
		return 0;
	}

	if(!bUrlopen)
	{
		cout<<"Urlopen return false"<<endl;
		return 0;
	}

	cout<<byte<<endl;

	if(NULL != byte)
	{
		delete byte;
		byte = NULL;
	}

	return 0;
}