CECreateFileW function call does not return a valid file handle

[cliu]

My problem happens in my c# Windows ce 5.0 project. I am trying to open a serial port on a Symbol HHT by using CECreateFileW function of platform invoke from the coredll.dll as follows:

CECreateFileW(F ileName, GENERIC_WRITE | GENERIC_READ, 0, IntPtr.Zero, OPEN_EXISTING, 0, IntPtr.Zero);

where Filename is "COM1".
This call always returns "-1", i.e. a invalid file handle.
Anyone could help? Please.

[Plater]

Is this a .NET question? Seems more like C++.
If it IS .NET then Why not use the SerialPort object? It's available in the Compact Framework.