Marshalling struct with embedded pointer from C# to unmanaged driver

Question

I\'m trying to interface C# (.NET Compact Framework 3.5) with a Windows CE 6 R2 stream driver using P/Invoked DeviceIoControl() calls . For one of the IOCTL codes, the driv

Answer 1

When marshaling a struct which has an inline pointer, you need to define the value as an IntPtr and not an array

[StructLayout(LayoutKind.Sequential)]
public struct IoctlWriteRegsIn
{
    public uint Address;
    public IntPtr Buffer;
    public uint Size;
}