How to use this WndProc in Windows Forms application?

Question

Please guide me how to use this WndProc in Windows Forms application:

private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam,         


        

Answer 1

You can use Application.AddMessageFilter Method.

[SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
public class TestMessageFilter : IMessageFilter
{
    public bool PreFilterMessage(ref Message m)
    {
        // Blocks all the messages relating to the left mouse button. 
        if (m.Msg >= 513 && m.Msg <= 515)
        {
            Console.WriteLine("Processing the messages : " + m.Msg);
            return true;
        }
        return false;
    }
}

Answer 2

The prototype for WndProc in C# is:

protected virtual void WndProc(ref Message m)

So, you need to override this procedure in your class, assumed that it's derived from Control.

protected override void WndProc(ref Message m)
{
    Boolean handled = false; m.Result = IntPtr.Zero;
    if (m.Msg == NativeCalls.APIAttach && (uint)m.Param == NativeCalls.SKYPECONTROLAPI_ATTACH_SUCCESS)
    {
        // Get the current handle to the Skype window
        NativeCalls.HWND_BROADCAST = m.WParam;
        handled = true;
        m.Result = new IntPtr(1);
    }

    // Skype sends our program messages using WM_COPYDATA. the data is in lParam
    if (m.Msg == NativeCalls.WM_COPYDATA && m.WParam == NativeCalls.HWND_BROADCAST)
    {
        COPYDATASTRUCT data = (COPYDATASTRUCT)Marshal.PtrToStructure(m.LParam, typeof(COPYDATASTRUCT));
        StatusTextBox.AppendText(data.lpData + Environment.NewLine);

        // Check for connection
        if (data.lpData.IndexOf("CONNSTATUS ONLINE") > -1)
            ConnectButton.IsEnabled = false;

        // Check for calls
        IsCallInProgress(data.lpData);
        handled = true;
        m.Result = new IntPtr(1);
    }

    if (handled) DefWndProc(ref m); else base.WndProc(ref m);
}