How to use RAPI.Invoke to call device winapi method from Desktop app

Question

I need to get Device Id from a desktop application, where Device is a Windows CE 5.0 based handheld terminal and it is connected to PC.

Getting this information from an application within the device is easy, I can use any of GetDeviceUniqueID or KernelIoControl WinApi methods for example:

    [DllImport("coredll.dll")]
    private extern static int GetDeviceUniqueID([In, Out] byte[] appdata,
                           int cbApplictionData,
                            int dwDeviceIDVersion,
                            [In, Out] byte[] deviceIDOuput,
                            out uint pcbDeviceIDOutput);

    public byte[] GetDeviceID(string AppString)
    {
        // Call the GetDeviceUniqueID
        byte[] AppData = Encoding.Unicode.GetBytes(AppString);
        int appDataSize = AppData.Length;
        byte[] DeviceOutput = new byte[20];
        uint SizeOut = 20;
        GetDeviceUniqueID(AppData, appDataSize, 1, DeviceOutput, out SizeOut);
        return DeviceOutput;
    }

But I need to get this from Desktop application.

There is a sample within Windows Mobile 5.X SDK to get this ID from Desktop app. Since I am using Windows CE that sample does not give an ID (It's for windows mobile).

I believe it is possible to use said method from desktop app using RAPI.Invoke() method (Or Opennetcf RAPI). But I can't figure how to use RAPI.Invoke with multi-parameter WinApi method e.g. GetDeviceUniqueID .

I have a sample code, also included C# signature of WinApi method as comment:

    //[DllImport("coredll.dll")]
    //private extern static int GetDeviceUniqueID([In, Out] byte[] appdata,
    //                       int cbApplictionData,
    //                        int dwDeviceIDVersion,
    //                        [In, Out] byte[] deviceIDOuput,
    //                        out uint pcbDeviceIDOutput);

    private void buttonGetDeviceID_Click(object sender, RoutedEventArgs e)
    {
        // RAPI
        RAPI rapi = new RAPI();
        rapi.Connect(true);
        // How do I pass several parameters inside a byte[] ?
        rapi.Invoke(@"\Windows\coredll.dll", "GetDeviceUniqueID", inputData, out outputData);
        //Process outputData
    }

Also there is a similar question here but does not provide any solution.

Answer 1

I found the answer here. In a nutshell; There is no direct way, I need to create a Win32 dll with C where call to WINAPI will be made and deploy it to \Windows folder. After that I can use it with RAPI.Invoke().

Also this is the link to article containing implementation.