get a message send by postmessage

Hello,
I'm trying to make an graphic user interface for an app running in dos mode; This app (programmed in c) send messages using the PostMessage API.
I cant call this app and tell it to send the message to my GUI by putting a GetForegroundWindow in the command line, but how can I get back those messages. I tried PeekMessage but I always obtain a message the text (MyMessage.message) of which is 512.

So, what did I do wrong ?
Thanks for any help.

Up there, does really nobody uses PostMessage ?

No, you're doing it right. The reason you're getting 512 is because that's the "code" for the WM_MOUSEMOVE event. Because you move your mouse almost all the time, it will appear like it's the only message.

Add this to a Form with a Timer and a ListBox.

VB Code:

Private Declare Function GetMessage Lib "user32" Alias "GetMessageA" (lpMsg As MSG, ByVal hwnd As Long, ByVal wMsgFilterMin As Long, ByVal wMsgFilterMax As Long) As Long
Private Type POINTAPI
    x As Long
    y As Long
End Type
Private Type MSG
  hwnd As Long
  message As Long
  wParam As Long
  lParam As Long
  time As Long
  pt As POINTAPI
End Type
 
 
Private Sub Timer1_Timer()
    
    Dim tMSG As MSG
    
    GetMessage tMSG, hwnd, 0, 0
    List1.AddItem tMSG.message
    List1.ListIndex = List1.ListCount - 1
    
End Sub

Now try different things like clicking the mouse buttons, or clicking the title bar etc. and you'll see that different messages appear in the listbox.

Not even the MouseMove (512) messages are showing up?

Also, change the Timer's interval to a lower value. Maybe it's "too slow" to catch some of the messages.

Yes I've got them, and all the number correspnding to movement upon other windows, controls....

Thus, when I let the mouse stand still, I have a 0 at each timer interval :confused:

Maybe someone know what message 0 is.
One more thing, when I get the name of the sender (using another API the name of which I don't remeber, but which give the sender name knowing it's Hwnd) there is a name when I move the mouse on another window but here the name is >< (I mean nothing, Null) :confused: