I am working on a project where an existing application written VC++ 6.0 needs to communicate with an application being written in VC#.NET. We have attempted to use RegisterWindowMessage, PostMessage, and PeekMessage. We have verified that we are getting common message IDs and that PostMessage is working. PeekMessage, however is not working, and in the VC++ app I have found that using ON_REGISTERED_MESSAGE to create a message handler in my class works.

The question I have not been able to answer is how to do the corresponding function in the C# application (ON_REGISTERED_MESSAGE).

Any help is appreciated.

If your C# app is a Windows Form, you can try to override the message loop:

for instance:

Code Snippet

namespace WindowsApplication1 {

public partial class Form1 : Form {

public Form1 () {

InitializeComponent ();

}

protected override void WndProc (ref Message m) {

const int myMessage = 0x12345; // whatever your ID is...

switch (m.Msg) {

case myMessage: {

// ...

} break;

default: {

base.WndProc (ref m);

} break;

}

}

}

}

This should allow you to trap any message that is received by your form.

HTH

--mc

If your C# app is a Windows Form, you can try to override the message loop:

for instance:

Code Snippet

namespace WindowsApplication1 {

public partial class Form1 : Form {

public Form1 () {

InitializeComponent ();

}

protected override void WndProc (ref Message m) {

const int myMessage = 0x12345; // whatever your ID is...

switch (m.Msg) {

case myMessage: {

// ...

} break;

default: {

base.WndProc (ref m);

} break;

}

}

}

}

This should allow you to trap any message that is received by your form.

HTH

--mc

I don't believe there is a simple method of doing that. The less-than-simple method would involve override your form's WndProc method.

Hello,

The WndProc overide did not work. I capture messages that seem to be sent from my application to my application, however we have a C++ app that is using PostMessage with the BROADCAST paramater to broadcast to all top level windows.

When the PostMessage is called, the code never even breaks in the WndProc override. Is there any way I can capture this message?