Opening COM1 port using CreateFile is returning invalide handle

i have connected my wince device with pc.now from my code i am using following code to open COM1 port and write on it. but it is not opening.Why?

WCHAR* m_PortNam = L"COM1";
m_hCOM = CreateFile(m_PortName,         // Specify port device: default "COM1"
        GENERIC_WRITE,                      // Specify mode that open device.
        0,                                  // the devide isn't shared.
        NULL,                               // the object gets a default security.
        OPEN_EXISTING,                      // Specify which action to take on file. 
        0,                                  // default.
        NULL); 

                         // default.
if(m_hCOM != INVALID_HANDLE_VALUE)
{


}
else开发者_Go百科
{
    //always going here
}

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In Windows CE, the port name must include the colon:

TCHAR *m_PortName = _T("COM1:");