SendMessage without waiting or PostMessage with Data

[alag20]

Hi Guys,
I need to send a string from c# application to another c# Application.

On receiving application side the code i have is below.

 
 protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case (int)Msg.WM_USER:
                    break;
                case (int)Msg.WM_COPYDATA:
                    COPYDATASTRUCT mystr = new COPYDATASTRUCT();
                    Type mytype = mystr.GetType();
                    mystr = (COPYDATASTRUCT) m.GetLParam(mytype);
                    //Here is where i want to do my processing but return the result
                    //to calling application.
                    break;
            }
 
            base.WndProc(ref m);
        }
 
 
 

Ideally i dont want to wait after extracting mystr for results to be returned, i just want it to act like PostMessage. The reason i cant use PostMessage is because it doesnt work with WM_COPYDATA. Please help guys!!!!!!!!!!!!

[alag20]

Okay guys!
After another day of messing around, i finally found the solution.

I am posting it here in case anyone else might need it as well.

You basically need to use ReplyMessage in Win32.dll in WndProc as shown below.

 
 protected override void WndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case (int)Msg.WM_USER:
                    break;
                case (int)Msg.WM_COPYDATA:
                    COPYDATASTRUCT mystr = new COPYDATASTRUCT();
                    Type mytype = mystr.GetType();
                    mystr = (COPYDATASTRUCT) m.GetLParam(mytype);
                    if (Win32.InSendMessage())
                        Win32.ReplyMessage(IntPtr.Zero); //Returns 0 to calling application
                    //Do your stuff here
                    break;
            }
 
            base.WndProc(ref m);
        }
 
 
 

[GaryTexmo]

I have no idea about any of this, I just wanted to say thanks for updating with your solution. This site seems to get a lot of google hits, so having this here is bound to help someone :)