同樣的程式代碼，同樣的資料請求，WinHttpSendRequest介面在win10和win8系統下執行正常。
在win7下執行回傳false。getlasterror得到12029.
在win7下開啟http debuger抓包工具后，執行又正常了。
在win7下開啟fiddler抓包工具，執行回傳false，但是抓包工具沒有抓到請求資料。
ps:在win10系統下，開啟fiddler也抓不到請求資料。但是代碼執行正常。回傳true。
求大神指導下，這個奇怪問題，大概怎么分析調查。
uj5u.com熱心網友回復：
12029 ERROR_WINHTTP_CANNOT_CONNECT試試MSDN的參考例子
DWORD dwSize = 0;
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);
// Specify an HTTP server.
if (hSession)
hConnect = WinHttpConnect( hSession, L"www.microsoft.com",
INTERNET_DEFAULT_HTTPS_PORT, 0);
// Create an HTTP request handle.
if (hConnect)
hRequest = WinHttpOpenRequest( hConnect, L"GET", NULL,
NULL, WINHTTP_NO_REFERER,
WINHTTP_DEFAULT_ACCEPT_TYPES,
WINHTTP_FLAG_SECURE);
// 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 memory\n");
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);
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