WinCE

Hi guys,

Here is a code for changing the current usb client function from Serial to Mass storage dynamically.

/*
* #FUNCTION
*
* @Function: GetUfnController
* @Return: INVALID_HANDLE_VALUE - USB Function device was not found
*   Otherwise, if found
* @Parameters: 
* @Description:
*  Function to get the handle of a USB Client device.
*/
HANDLE GetUfnController()
{
HANDLE hUfn = NULL;
// Get a handle to the bus driver
DEVMGR_DEVICE_INFORMATION di;
memset(&di, 0, sizeof(di));
di.dwSize = sizeof(di);

#ifdef _SEARCH_WITH_GUID_
BYTE rgbGuidBuffer[sizeof(GUID) + 4]; // +4 because scanf writes longs
memset(&rgbGuidBuffer[0],0,sizeof(GUID) + 4);
LPGUID pguidBus = (LPGUID) rgbGuidBuffer;
LPCTSTR pszBusGuid = _T("E2BDC372-598F-4619-BC50-54B3F7848D35");
// Parse the GUID
if (FALSE == ConvertStringToGuid(&pszBusGuid[0],pguidBus) )
return INVALID_HANDLE_VALUE;
HANDLE hf = FindFirstDevice(DeviceSearchByGuid, pguidBus, &di);
#else
HANDLE hf = FindFirstDevice(DeviceSearchByLegacyName, L"UFN1:", &di);
#endif /* _SEARCH_WITH_GUID_ */
if (hf != INVALID_HANDLE_VALUE) {
hUfn = CreateFile(di.szBusName, GENERIC_READ, FILE_SHARE_READ,NULL, OPEN_EXISTING, 0, NULL);
CloseHandle(hf);
}
else {
hUfn = INVALID_HANDLE_VALUE;
}
return hUfn;
} /* GetUfnController */

/*
* #FUNCTION
*
* @Function: ChangeClient
* @Return: TRUE - Client Function change was succesful
*   FALSE - Client Function change failed
* @Parameters:
*   hUfn - Handle to the USB client device
*   pszNewClient - New usb function to be loaded
* @Description:
*  Function to switch the active usb client function driver
*/
BOOL ChangeClient(HANDLE hUfn, LPCTSTR pszNewClient)
{
if(hUfn == INVALID_HANDLE_VALUE || pszNewClient == NULL)
return ERROR_INVALID_PARAMETER;
DWORD dwRet = ERROR_SUCCESS;
UFN_CLIENT_NAME ucn;
_tcscpy(ucn.szName, pszNewClient);
BOOL fSuccess = DeviceIoControl(hUfn,
IOCTL_UFN_CHANGE_CURRENT_CLIENT, &ucn, sizeof(ucn), NULL, 0, NULL, NULL);
return fSuccess;
} /* ChangeClient */

/*
* #FUNCTION
*
* @Function: ConnectionStatus
* @Return: TRUE - Active sync session is active
*          FALSE - Active sync session is not detected
* @Parameters: 
* @Description:
*  Function to Check the connection status of ActiveSync
*/
BOOL ConnectionStatus(VOID)
{
RASCONN   rsconn[10];
DWORD   dwcb, dwConnections;
RASCONNSTATUS rasStatus;
BOOL   bConnected = FALSE;

// Enumerate active connections
dwcb = sizeof(rsconn);
rsconn[0].dwSize = sizeof(RASCONN);
if(RasEnumConnections(rsconn, &dwcb, &dwConnections) == 0) {
if(dwConnections == 0 || rsconn[0].hrasconn == NULL) {
DBG_PRINT ("No current connections\r\n");
}
else{
// Get first RAS connection status
rasStatus.dwSize = sizeof(rasStatus);
if(RasGetConnectStatus(rsconn[0].hrasconn, &rasStatus) != 0) {
 DBG_PRINT ("Could not get RAS connection status\r\n");
}
else{
 // Is it connected?
 if(rasStatus.rasconnstate != RASCS_Connected) {
  DBG_PRINT("Not connected\r\n");
 }
 else {
  if ((0 == wcscmp(L"direct",rasStatus.szDeviceType)) &&
      (0 == wcscmp(L"Serial on USB",rasStatus.szDeviceName))) {
   DBG_PRINT(TEXT("Got an activesync connection..\r\n"));
   bConnected = TRUE;
  }
 }
}
}
}
else {
DBG_PRINT ("Could not enumerate RAS connections\r\n");
}
return bConnected;
} /* ConnectionStatus */