示例
#include <string>
#include <iostream>
#include <windows.h>
#include <winhttp.h>
#pragma comment(lib,"winhttp.lib")
#pragma comment(lib,"user32.lib")
void main()
{
DWORD dwSize = 0;
DWORD dwDownloaded = 0;
LPSTR pszOutBuffer = NULL;
HINTERNET hSession = NULL,
hConnect = NULL,
hRequest = NULL;
BOOL bResults = FALSE;
hSession=WinHttpOpen(L"User-Agent",WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,WINHTTP_NO_PROXY_NAME,WINHTTP_NO_PROXY_BYPASS,0);
if(hSession)
{
hConnect=WinHttpConnect(hSession,L"192.168.0.8",INTERNET_DEFAULT_HTTP_PORT,0);
}
if(hConnect)
{
hRequest=WinHttpOpenRequest(hConnect, L"POST",L"login.html",L"HTTP/1.1", WINHTTP_NO_REFERER,WINHTTP_DEFAULT_ACCEPT_TYPES,0);
}
LPCWSTR header=L"Content-type: application/x-www-form-urlencoded/r/n";
SIZE_T len = lstrlenW(header);
WinHttpAddRequestHeaders(hRequest,header,DWORD(len), WINHTTP_ADDREQ_FLAG_ADD);
if(hRequest)
{
std::string data="name=host&sign=xx11sad";
const void *ss=(const char *)data.c_str();
bResults=WinHttpSendRequest(hRequest, 0, 0,const_cast<void *>(ss),data.length(), data.length(), 0 );
////bResults=WinHttpSendRequest(hRequest,WINHTTP_NO_ADDITIONAL_HEADERS, 0,WINHTTP_NO_REQUEST_DATA, 0, 0, 0 );
}
if(bResults)
{
bResults=WinHttpReceiveResponse(hRequest,NULL);
}
if(bResults)
{
do
{
// Check for available data.
dwSize = 0;
if (!WinHttpQueryDataAvailable( hRequest, &dwSize))
{
printf( "Error %u in WinHttpQueryDataAvailable.\n",GetLastError());
break;
}
if (!dwSize)
break;
pszOutBuffer = new char[dwSize+1];
if (!pszOutBuffer)
{
printf("Out of memory\n");
break;
}
ZeroMemory(pszOutBuffer, dwSize+1);
if (!WinHttpReadData(hRequest, (LPVOID)pszOutBuffer, dwSize, &dwDownloaded))
{
printf( "Error %u in WinHttpReadData.\n", GetLastError());
}
else
{
printf("%s", pszOutBuffer);
}
delete [] pszOutBuffer;
if (!dwDownloaded)
break;
} while (dwSize > 0);
}
if (hRequest) WinHttpCloseHandle(hRequest);
if (hConnect) WinHttpCloseHandle(hConnect);
if (hSession) WinHttpCloseHandle(hSession);
system("pause");
}
下面的代码示例在请求中包含 If-Modified-Since 标头。 将解释响应标头以确定目标文档是否已更新。
C++
DWORD dwSize = sizeof(DWORD);
DWORD dwStatusCode = 0;
BOOL bResults = FALSE;
HINTERNET hSession = NULL,
hConnect = NULL,
hRequest = NULL;
// Use WinHttpOpen to obtain a session handle.
hSession = WinHttpOpen( L"A WinHTTP Example Program/1.0",
WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS,
0 );
// Specify an HTTP server.
if( hSession )
hConnect = WinHttpConnect( hSession,
L"www.microsoft.com",
INTERNET_DEFAULT_HTTP_PORT,
0 );
// Create an HTTP Request handle.
if( hConnect )
hRequest = WinHttpOpenRequest( hConnect,
L"GET",
NULL,
NULL,
WINHTTP_NO_REFERER,
WINHTTP_DEFAULT_ACCEPT_TYPES,
0 );
// Add a request header.
if( hRequest )
bResults = WinHttpAddRequestHeaders( hRequest,
L"If-Modified-Since: Mon, 20 Nov 2000 20:00:00 GMT",
(ULONG)-1L,
WINHTTP_ADDREQ_FLAG_ADD );
// Send a Request.
if( bResults )
bResults = WinHttpSendRequest( hRequest,
WINHTTP_NO_ADDITIONAL_HEADERS,
0,
WINHTTP_NO_REQUEST_DATA,
0,
0,
0 );
// End the request.
if( bResults )
bResults = WinHttpReceiveResponse( hRequest, NULL);
// Use WinHttpQueryHeaders to obtain the header buffer.
if( bResults )
bResults = WinHttpQueryHeaders( hRequest,
WINHTTP_QUERY_STATUS_CODE | WINHTTP_QUERY_FLAG_NUMBER,
NULL,
&dwStatusCode,
&dwSize,
WINHTTP_NO_HEADER_INDEX );
// Based on the status code, determine whether
// the document was recently updated.
if( bResults )
{
if( dwStatusCode == 304 )
printf( "Document has not been updated.\n" );
else if( dwStatusCode == 200 )
printf( "Document has been updated.\n" );
else
printf( "Status code = %u.\n",dwStatusCode );
}
// Report any errors.
if( !bResults )
printf( "Error %d has occurred.\n", GetLastError( ) );
// Close open handles.
if( hRequest ) WinHttpCloseHandle( hRequest );
if( hConnect ) WinHttpCloseHandle( hConnect );
if( hSession ) WinHttpCloseHandle( hSession );
要求
| |
最低受支持的客户端 | Windows XP、Windows 2000 Professional 和 SP3 [仅限桌面应用] |
最低受支持的服务器 | Windows Server 2003、具有 SP3 的 Windows 2000 Server [仅限桌面应用] |
目标平台 | Windows |
标头 | winhttp.h |
Library | Winhttp.lib |
DLL | Winhttp.dll |
可再发行组件 | Windows XP 和 Windows 2000 上的 WinHTTP 5.0 和 Internet Explorer 5.01 或更高版本。 |