当第一个ip坏时，使用winhttp连接到多宿主主机
我试图确认这里描述的功能：
http://msdn.microsoft.com/en-us/library/aa384066(VS.85).aspx
WINHTTP_OPTION_CONNECT_RETRIES设置或
检索无符号长整数
包含数量的值
WinHTTP试图连接到一个
主办。 Microsoft Windows HTTP服务
（WinHTTP）只尝试一次
Internet协议（IP）地址。对于
例如，如果您尝试连接到
一个拥有10个IP的多宿主主机
地址和
WINHTTP_OPTION_CONNECT_RETRIES已设置
到7，然后WinHTTP只尝试
连接到前七个IP地址。
给定相同的10个IP地址，
如果WINHTTP_OPTION_CONNECT_RETRIES是
设置为20，WinHTTP尝试每个
10只一次。如果是连接
尝试后仍然失败
指定的尝试次数，或者是否
连接超时之前已过期
然后，请求被取消。该
默认值
WINHTTP_OPTION_CONNECT_RETRIES是五
尝试。
实际上有效。
我的代码是：
int main()
{
DWORD dwDownloaded = 0;
LPSTR pszOutBuffer;
BOOL bResults = FALSE;
HINTERNET hSession = NULL,
hConnect = NULL,
hRequest = NULL;
// Use WinHttpOpen to obtain a session handle.
hSession = WinHttpOpen( L"WinHTTP Example/1.0",
WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,
WINHTTP_NO_PROXY_NAME,
WINHTTP_NO_PROXY_BYPASS, 0 );
DWORD data;
DWORD dwSize = sizeof(DWORD);
if (hSession)
{
// Use WinHttpQueryOption to retrieve internet options.
if (WinHttpQueryOption( hSession,
WINHTTP_OPTION_CONNECT_RETRIES,
&data, &dwSize))
{
printf("Connection Retries: %u nn",data);
}
else
{
printf( "Error %u in WinHttpQueryOption.n", GetLastError());
}
}
else
{
printf("Error %u in WinHttpOpen.n", GetLastError());
}
dwSize = 0;
// Specify an HTTP server.
if( hSession )
hConnect = WinHttpConnect( hSession, L"google.com",
INTERNET_DEFAULT_HTTP_PORT, 0 );
// Create an HTTP request handle.
if( hConnect )
hRequest = WinHttpOpenRequest( hConnect, L"GET", NULL,
NULL, WINHTTP_NO_REFERER,
NULL,
NULL );
// Send a request.
if( hRequest )
bResults = WinHttpSendRequest( hRequest,
WINHTTP_NO_ADDITIONAL_HEADERS, 0,
WINHTTP_NO_REQUEST_DATA, 0,
0, 0 );
// End the request.
if( bResults )
bResults = WinHttpReceiveResponse( hRequest, NULL );
// Keep checking for data until there is nothing left.
if( bResults )
{
do
{
// Check for available data.
dwSize = 0;
if( !WinHttpQueryDataAvailable( hRequest, &dwSize ) )
printf( "Error %u in WinHttpQueryDataAvailable.n",
GetLastError( ) );
// Allocate space for the buffer.
pszOutBuffer = new char[dwSize+1];
if( !pszOutBuffer )
{
printf( "Out of memoryn" );
dwSize=0;
}
else
{
// Read the data.
ZeroMemory( pszOutBuffer, dwSize+1 );
if( !WinHttpReadData( hRequest, (LPVOID)pszOutBuffer,
dwSize, &dwDownloaded ) )
printf( "Error %u in WinHttpReadData.n", GetLastError( ) );
else
printf( "%s", pszOutBuffer );
// Free the memory allocated to the buffer.
delete [] pszOutBuffer;
}
} while( dwSize > 0 );
}
// Report any errors.
if( !bResults )
printf( "Error %d has occurred.n", GetLastError( ) );
// Close any open handles.
if( hRequest ) WinHttpCloseHandle( hRequest );
if( hConnect ) WinHttpCloseHandle( hConnect );
if( hSession ) WinHttpCloseHandle( hSession );
getchar();
return 0;
}
123.123.123.123 google.com
66.102.7.99 google.com
ping google.com
ipconfig /displaydns
没有找到相关结果
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