How to create the C++ DLL for Windows Mobile and how to import it in C#

Question

Hi All,
     Please can u guide me for creating DLL on C++ and using it in C#
     1) Steps to create the DLL using C++ for Windows Mobile
     2) And where to place the DLL after builiding to make use of it in my C# project
Thanks in Advance!!!
Thanks & Regards,
Sharan

Answer 1

Hello all,
I know this is an old thread but i have to give it a try ( i am stuck with an almost identical problem but cant solve it since 5 days googling and reading.
I am developing an app for Unitech HT660e which has Win CE. THe app is complete but now i need some more control over the barcode scanner. In order to gain controll i need to use USI.dll which is explained in this documentation (chapter 2 has the link to
the SDK which contains the USI.dll ) :
http://www.datacol.co.nz/pdf/uni_prog-guide_1.21.pdf
But i also get : Cant find PInvoke DLL 'USI.dll'.
In chapter 4 is SysIOAPI.DLL mentioned which i cant fin.
Chapter 17 has USICF.dll which may be interesting bcos this one can be added as reference and "using USICF" . I am using compact framework 3.5 for this and the emulator is "usa windows mobile 5.0 pocket pc r2 emulator". 
Reading your post i noticed i can use the "Pocket PC 2003 SE Emulator" but it gives me the same error.
Maybe i need to include a path in my code but i tried this as well...and get the same problem. Maybe i am missing something.
Here is my code:
using USICF;
using System.Runtime.InteropServices;
namespace SmartDeviceProjectzaDLLtesting
    public partial class Form1 : Form
        [DllImport("USI.dll", EntryPoint = "VibrationOn")]   //ignorethis?:,CallingConvention=CallingConvention.Winapi)]//Cdecl)]    //EntryPoint = "VibrationOn")]
        public static extern void VibrationOn(bool bEnable);
        public Form1()
            InitializeComponent();
        private void Form1_Load(object sender, EventArgs e)
           // USICF.USIClass usiba = new USICF.USIClass(this); // this gives an exception as well
           VibrationOn(true); // thiis causes the exception
 //           VibrationOn(false);