create device handle by using c# dll

[TanTan]

Hi,

I am using Labview 8.5.1, would like to create a device handle for below C# function.

IntPtr hardwareDetector = CodeUtil.NativeMethods.Code_CreateHardwareDetector(null);

I have attached my sample vi. May i know is it a correct way? I have attached the user manual for the dll too.

Is it Null = empty string?

Devide Handle in Unsigned 32 bits?

Thanks.