VC使用Http Get方法获取页面内容
http://blog.csdn.net/mrxyz098/article/details/27992049
该函数可以用于读取指定页面信息。如页面代码为：
<html><body>
hello world
</body>
</html>
该函数读取到的内容将是：hello world
#include <Wininet.h>
#pragma comment(lib, "Wininet.lib")
BOOL HttpRequestGet(IN const CString& sHomeUrl, IN const CString& sPageUrl, OUT CString &sResult)
{
LONG nPort = 80;
HINTERNET hInternet;
DWORD nGetSize;
LPSTR lpszData = NULL;
DWORD dwSize = 0;
DWORD dwDownloaded = 0;
hInternet = InternetOpen(_T("Mozilla/4.0 (compatible; Indy Library)"),
INTERNET_OPEN_TYPE_DIRECT, NULL, NULL, 0);
if (NULL == hInternet)
{
sResult.Format(_T("Open link error. ErrCode=[%u]"), GetLastError());
InternetCloseHandle(hInternet);
return FALSE;
}
// 打开http session
HINTERNET hSession = InternetConnect(hInternet, sHomeUrl,
(INTERNET_PORT)nPort, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0);
CString sHtmlHeader;
sHtmlHeader = _T("Content-Type: application/x-www-form-urlencoded\r\n");
sHtmlHeader += _T("Accept: text/html, */*\r\n");
sHtmlHeader += _T("User-Agent: Mozilla/4.0 (compatible;Indy Library)\r\n");
LPSTR pszResponse = new char[640 * 1024];
memset(pszResponse, 0, 640 * 1024);
HINTERNET hRequest = HttpOpenRequest(hSession, _T("GET"), sPageUrl,
_T("HTTP/1.1"), _T(""), 0, INTERNET_FLAG_NO_AUTH |
INTERNET_FLAG_DONT_CACHE | INTERNET_FLAG_NO_CACHE_WRITE, 0);
int iTimeout = 10000;
InternetSetOption(hRequest, INTERNET_OPTION_CONNECT_TIMEOUT,
&iTimeout, sizeof(iTimeout));
InternetSetOption(hRequest, INTERNET_OPTION_SEND_TIMEOUT,
&iTimeout, sizeof(iTimeout));
InternetSetOption(hRequest, INTERNET_OPTION_RECEIVE_TIMEOUT,
&iTimeout, sizeof(iTimeout));
InternetSetOption(hRequest, INTERNET_OPTION_DATA_SEND_TIMEOUT,
&iTimeout, sizeof(iTimeout));
InternetSetOption(hRequest, INTERNET_OPTION_DATA_RECEIVE_TIMEOUT,
&iTimeout, sizeof(iTimeout));
InternetSetOption(hRequest, INTERNET_OPTION_LISTEN_TIMEOUT,
&iTimeout, sizeof(iTimeout));
BOOL bResult = HttpSendRequest(hRequest, sHtmlHeader.GetBuffer(),
sHtmlHeader.GetLength(), _T(""), 0);
sHtmlHeader.ReleaseBuffer();
if (FALSE == bResult)
{
sResult.Format(_T("Send request error. ErrCode=[%u]"), GetLastError());
InternetCloseHandle(hRequest);
InternetCloseHandle(hSession);
InternetCloseHandle(hInternet);
delete[]pszResponse;
return FALSE;
}
nGetSize = 0;
// 循环读取数据
do
{ // 检查在http response 还有多少字节可以读取
if (!InternetQueryDataAvailable(hRequest, &dwSize, 0, 0))
{
break;
}
// 读取数据
if (FALSE == InternetReadFile(hRequest,
(LPVOID)&pszResponse[nGetSize], dwSize, &dwDownloaded))
{
nGetSize += dwSize;
if (dwDownloaded == 0 || nGetSize > 600 * 1024)
{// 没有剩余数据
break;
}
}
} while (FALSE);
pszResponse[nGetSize] = 0;
sResult = ATL::CA2T(pszResponse);
InternetCloseHandle(hRequest);
InternetCloseHandle(hSession);
InternetCloseHandle(hInternet);
delete[]pszResponse;
if (sResult.Find(_T("<html>")) != -1)
{
sResult = _T("An unknown error occurred.");
return FALSE;
}
return TRUE;
}
void main()
{
// 如页面地址是：http://www.myWebSite.com/Temporary/index.ashx?username=mrxyz098&password=123
CString sHomeUrl(_T("www.myWebSite.com"));
CString sPageUrl(_T("Temporary/index.ashx?username=mrxyz098&password=123"));
CString sResult(_T(""));
HttpRequestGet(sHomeUrl, sPageUrl, sResult);
system("pause");
}