get a message send by postmessage

[ciler]

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.

[ciler]

Up there, does really nobody uses PostMessage ?

[Megatron]

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.

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.

[Megatron]

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.

[ciler]

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

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)