Asynchronous http connection

[Guest prathima]

Hi everybody,

I am trying to download a webpage/file using asynchronous wininet APIs.

Here is my code...

CString url = _T("");

edurl.GetWindowTextW(url);

HINTERNET hInternet, hConnect, hRequest;

hConnectedEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

hRequestOpenedEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

hRequestCompleteEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

hReceivedResponseEvent = CreateEvent(NULL, FALSE, FALSE, NULL);

hInternet = InternetOpen(L"", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, INTERNET_FLAG_ASYNC);

if (hInternet == NULL)

{

AfxMessageBox(_T("InternetOpen failed, error"));

GetLastError();

CloseHandle(hInternet);

return;

}

// Setup callback function

if (InternetSetStatusCallback(hInternet,

InternetCallback) == INTERNET_INVALID_STATUS_CALLBACK)

{

AfxMessageBox(_T("InternetSetStatusCallback failed, error"));

GetLastError();

CloseHandle(hInternet);

return;

}

hConnect = InternetConnect(hInternet,url,INTERNET_DEFAULT_HTTP_PORT,NULL,NULL,INTERNET_SERV

CE_HTTP,0, 1);

if (hConnect == NULL)

{

if (GetLastError() != ERROR_IO_PENDING)

{

AfxMessageBox(_T("InternetConnect failed, error"));

GetLastError();

CloseHandle(hInternet);

CloseHandle(hConnect);

return;

}

// Wait until we get the connection handle

WaitForSingleObject(hConnectedEvent, INFINITE);

}

DWORD dwOpenRequestFlags;

DWORD dwInfoBufferLength =MAXINFO-1;

BYTE byInfoBuff[10000]="";

// DWORD dwBytesAvailable,dwBytesAvailableFile=0;

// DWORD dwError;

// HANDLE hTempFile;

TCHAR tcVersion[] = L"HTTP/1.1";

TCHAR *pptcAcceptTypes[] ={

L"text/skmobile",

L"text/skive",

L"text/html",

L"text/*",

L"image/gif",

L"image/png",

L"image/x-xbitmap",

L"image/jpeg",

L"*/*",

NULL

};

dwOpenRequestFlags =INTERNET_FLAG_KEEP_CONNECTION

|INTERNET_FLAG_RELOAD ;

hRequest = HttpOpenRequest(hConnect, TEXT("GET"), NULL, (LPCTSTR)tcVersion,NULL,(LPCTSTR * )pptcAcceptTypes, dwOpenRequestFlags, 2);

if (hRequest == NULL)

{

if (GetLastError() != ERROR_IO_PENDING)

{

AfxMessageBox(_T("HttpOpenRequest failed, error"));

GetLastError();

CloseHandle(hInternet);

CloseHandle(hConnect);

CloseHandle(hRequest);

return;

}

// Wait until we get the request handle

WaitForSingleObject(hRequestOpenedEvent, INFINITE);

}

// sending the specified request to the HTTP server

if (!HttpSendRequestEx(hRequest, NULL, 0,NULL,2))

{

if (GetLastError() != ERROR_IO_PENDING)

{

AfxMessageBox(_T("HttpSendRequest failed, error"));

GetLastError();

CloseHandle(hInternet);

CloseHandle(hConnect);

CloseHandle(hRequest);

return;

}

}

WaitForSingleObject(hRequestCompleteEvent, INFINITE);

CHAR buffer[1024];

DWORD dwRead = sizeof(buffer)-1;

INTERNET_BUFFERS ib = { sizeof(INTERNET_BUFFERS) };

ZeroMemory (& ib, sizeof (INTERNET_BUFFERS));

ib.lpvBuffer = buffer;

ib.dwBufferLength = dwRead;

BOOL bOk = InternetReadFileEx( hRequest, &ib, IRF_ASYNC, 2 );

DWORD err = GetLastError();

if(!bOk && GetLastError()==ERROR_IO_PENDING)

{

WaitForSingleObject(hReceivedResponseEvent, INFINITE);

}

while( bOk && ib.dwBufferLength!=0 )

{

m_StrContent += buffer;

bOk = InternetReadFileEx( hRequest, &ib, IRF_ASYNC, 2 );

if(!bOk && GetLastError()==ERROR_IO_PENDING)

{

WaitForSingleObject(hReceivedResponseEvent, INFINITE);

}

}

UpdateData(FALSE);

CloseHandle(hInternet);

CloseHandle(hConnect);

CloseHandle(hRequest);

I am getting error 120 on calling InternetReadFileEx in emulator.

If anybody has any clue on what is the problem in my code plz let me know.

Thanks

Prathima