Need help with RegisterWindowMessage and SendMessage from c++ to c#

Question

I have this code in C#:

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
static extern uint RegisterWindowMessage(string lpProcName);

[DllImport("user32.dll")]
private static extern IntPtr SendMessage(
   IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

and I need to convert this from C++ to C#:

UINT UWM_UART_CTRL_TRS = ::RegisterWindowMessage(_T("BT_UARTCTRL_TRANSFER"));
::SendMessage(HWND_BROADCAST, UWM_UART_CTRL_TRS, 0, 0);

and this:

UINT UWM_UART_CTRL_TRS = ::RegisterWindowMessage(_T("BT_UARTCTRL_TRANSFER"));
::SendMessage(HWND_BROADCAST, UWM_UART_CTRL_TRS, 1, 0);

Thanks in advance

Answer 1

Should be pretty straight forward. You'll need to change the PInvoke definitions to public inside the class that contains them:

public class Win32Api
{
   [DllImport("user32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
   public static extern uint RegisterWindowMessage(string lpString);

   [DllImport("user32.dll", SetLastError = true)]
   public static extern IntPtr SendMessage(
      IntPtr hWnd, uint Msg, IntPtr wParam, IntPtr lParam);
}

Then for the calls, they would look like this:

uint UWM_UART_CTRL_TRS = Win32Api.RegisterWindowMessage("BT_UARTCTRL_TRANSFER");
Win32Api.SendMessage(HWND_BROADCAST, UWM_UART_CTRL_TRS, (IntPtr)0, (IntPtr)0);

and this:

uint UWM_UART_CTRL_TRS = Win32Api.RegisterWindowMessage("BT_UARTCTRL_TRANSFER");
Win32Api.SendMessage(HWND_BROADCAST, UWM_UART_CTRL_TRS, (IntPtr)1, (IntPtr)0);