A stupid question

[Clay Clear]

Is it possible for an application to process %WM_ messages
from within the WINMAIN function? If so, what must be done before
that function can actually receive the messages?

Thanks in advance!


------------------
Clay C. Clear

http://www.v3space.com/a/a39/202/

[email protected]
[email protected]

[Gregery D Engle]

I am not sure if it is possible, never tried. You might
want to take a look at SetWindowLong, maybe something if you
subclass. I don't know why you would want to do this though.

------------------
-Greg

[Clay Clear]

Gregery,

I want to be able to do it because some of my programs go in the
system tray at Windows bootup, and run in the background
continuously until/unless manually closed.

Semen told me that it is possible to put an icon in the tray
without a dialog, and have it respond to mouse clicks by
using popup menus. But, how could I receive/process the
%WM_LBUTTONDOWN, %WM_RBUTTONDOWN, and %WM_COMMAND messages
without a Callback function? And, to have a callback function,
aren't I required to have a parent dialog?

That is why I posted the original message, because I want to
be able to code those programs so they don't require Dialog's or
Callback Functions.

Any ideas?


------------------
Clay C. Clear

http://www.v3space.com/a/a39/202/

[email protected]
[email protected]

[Kev Peel]

Clay,

All *proper* Windows apps need a callback function to operate, it is how Windows works.

Maybe a hidden Window might be what you're after?!?

(Sorry for short reply, ima bit 'bizzy')

------------------
Kev G Peel
KGP Software, Bridgwater, UK.
mailto:[email protected][email protected]</A> http://www.kgpsoftware.com

[Clay Clear]

Kev,

Thanks for your reply! That's all the info I needed, as I now
know not to pursue that avenue.

My system tray apps already use "hidden" windows - figured that
out with some help from source code posted in the Forums, and
some help from Lance.

Regards,


------------------
Clay C. Clear

http://www.v3space.com/a/a39/202/

[email protected]

[Scott Turchin]

I thought I posted this already....

This uses a dialog box, but this window is invisible...
And can be put in the system tray....

wndclass.cbSize = SizeOf(WndClass)
wndclass.style = %CS_HREDRAW Or %CS_VREDRAW
wndclass.lpfnWndProc = CodePtr( WndProc )
wndclass.cbClsExtra = 0
wndclass.cbWndExtra = 0
wndclass.hInstance = hInstance
wndclass.hIcon = LoadIcon (hInstance, "WINICO")
wndclass.hCursor = LoadCursor( %NULL, ByVal %IDC_ARROW)
wndclass.hbrBackground = GetStockObject(%LTGRAY_BRUSH)
wndclass.lpszMenuName = %NULL
wndclass.lpszClassName = VarPtr( szClassName )
wndclass.hIconSm = LoadIcon( hInstance,"WINICO")
RegisterClassEx wndclass

'--------------------------------------------------------------
'*Get the handle of an existing window and pass this on as the
' parent to this window so we can hide our process from showing
' up on the task bar
'--------------------------------------------------------------
'hdTopWnd& = GetDeskTopWindow()
 hNextWnd = GetTopWindow(0)
 hParent  = GetParent(hNextWnd)
'--------------------------------------------------------------

hWnd = CreateWindowEx(0,szClassName, _
                      "", _
                      %WS_POPUP Or %WS_DLGFRAME,_
                      %CW_USEDEFAULT, _
                      %CW_USEDEFAULT, _
                      %CW_USEDEFAULT, _
                      %CW_USEDEFAULT, _
                      hParent, _ '<-- assign to a parent window
                      %NULL, _
                      hInstance, _
                      ByVal %NULL)
UpdateWindow hWnd

'Remove from Task list
pid = GetCurrentProcessId()
RegisterServiceProcess pid, 1

While GetMessage(Msg, %NULL, 0, 0)
 TranslateMessage Msg
 DispatchMessage Msg
Wend
Function WndProc (ByVal hWnd As Long, _
                  ByVal wMsg As Long, _
                  ByVal wParam As Long, _
                  ByVal lParam As Long) Export As Long


Do your system tray stuff here as in the example given in samples\tray


End Function

------------------
Scott

[Clay Clear]

Thanks, Scott! I just printed out your source code.

Regards,


------------------
Clay C. Clear

http://www.v3space.com/a/a39/202/

[email protected]

[Lance Edmonds]

Well, now you have two ways to create a hidden window/dialog...

Kev has the right answer here - you are supposed to have a separate callback function to handle messages from Windows.

One idea here could be to just process the messages in your message pump, but do not dispatch the messages... I've never tried it, and it looks like a lot of work considering that a callback is incredibly easy to implement... I don't see what you stand to gain by trying to eliminate the callback.

------------------
Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Clay Clear]

Lance,

You raise a good point. However, it were actually the dialog's
that I was trying to eliminate, as my approach to it was pretty
kludgey (as you know ). Now, though, I can start implementing
Scott's approach.

Thanks again, Scott!


------------------
Clay C. Clear

http://www.v3space.com/a/a39/202/

[email protected]

[Semen Matusovski]

Clay --
As I remember, you wanted to hide initial appearence of dialog.
And I told you that you don't need to use dialog (because you can use classic SDK window).
In "tray" directory I found a sample, which is a part of PB tray.bas.
I beleive that I already posted it.

#Compile Exe
#Dim All
#Register None
#Resource "TRAY.PBR"
#Include "WIN32API.INC"

%WM_TRAYICON = %WM_USER + 400

CallBack Function DlgProc
  Static ti    As NOTIFYICONDATA
  Select Case CbMsg

    Case %WM_CREATE
      ti.cbSize           = SizeOf(ti)
      ti.hWnd             = CbHndl
      ti.uID              = GetModuleHandle(ByVal 0&)
      ti.uFlags           = %NIF_ICON Or %NIF_MESSAGE Or %NIF_TIP
      ti.uCallbackMessage = %WM_TRAYICON
      ti.hIcon            = LoadIcon(GetModuleHandle(ByVal 0&), "FACE1")
      ti.szTip            = "Task Tray Example"
      Shell_NotifyIcon %NIM_ADD, ti
      DestroyIcon ti.hIcon

    Case %WM_TRAYICON
      Select Case LoWrd(CbLparam)
        Case %WM_LBUTTONDOWN, %WM_RBUTTONDOWN
          MsgBox "Qu-qu. Finished.", %MB_TASKMODAL
          PostMessage CbHndl, %WM_SYSCOMMAND, %SC_CLOSE, 0
      End Select

    Case %WM_DESTROY
      Shell_NotifyIcon %NIM_DELETE, ti
      PostQuitMessage 0
  End Select

  Function = DefWindowProc(CbHndl, CbMsg, CbWparam, CbLparam)

End Function

Function PbMain
  Local Msg         As tagMsg
  Local wndclass    As WndClassEx
  Local szAppName   As Asciiz * 80
  Local hWnd        As Long

  szAppName              = "HelloWin"

  wndclass.cbSize        = SizeOf(WndClass)
  wndclass.lpfnWndProc   = CodePtr(DlgProc)
  wndclass.hInstance     = GetModuleHandle(ByVal 0&)
  wndclass.lpszClassName = VarPtr(szAppName)
  RegisterClassEx wndclass

  hWnd = CreateWindow(szAppName, "", 0, 0, 0, 0, 0, 0, 0, wndClass.hInstance, ByVal 0&)
  MsgBox "Look system tray and click an icon"

  While GetMessage(Msg, %NULL, 0, 0)
    TranslateMessage Msg
    DispatchMessage Msg
  Wend

End Function

------------------
E-MAIL: [email protected]

[Lance Edmonds]

Strangely enough, that code still creates a window...

------------------
Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Sven Blumenstein]

Haven't tried it out yet in PB, but in MASM I've written a little Prog, wich uses "GetMessage" in an endless loop to receive the "WM_TIMER" message.

again:

      invoke GetMessage,ADDR msg,NULL,0,0
      cmp eax, 0
      je stop
      mov eax,msg.message
      cmp eax,WM_TIMER
      jne again

stop:

Would be in PB:

again:
     call GetMessage(msg, 0, 0, 0)
     if msg.message = 0 then
     goto stop
     elseif msg.message <> WM_TIMER then goto again
     ...

stop:
     'end of prog, because if the programm does not receive any      messages, it should be terminated.
     ...

------------------
E-Mail (home): mailto:[email protected][email protected]</A>
E-Mail (work): mailto:[email protected][email protected]</A>

[This message has been edited by Sven Blumenstein (edited July 09, 2001).]

[Clay Clear]

Scott,

Can you post the DECLARE statement for RegisterServiceProcess()?

I couldn't find any reference to it in the PB/DLL INC's, nor is it
referenced in the Win32.hlp file.

Thanks!


------------------
Clay C. Clear

http://www.v3space.com/a/a39/202/

[email protected]

[Lance Edmonds]

When all else fails, try a BBS search...

Declare Function RegisterServiceProcess Lib "kernel32" Alias "RegisterServiceProcess" ( ByVal dwProcessID As Long, ByVal dwType As Long ) As Long

Note: RegisterServiceProcess does not "hide" applications under Windows NT/2000.


------------------
Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Tom Hanlin]

RegisterServiceProcess is not listed in the Windows SDKs. According to
the latest MSDN:

To call RegisterServiceProcess, retrieve a function pointer using GetProcAddress
on KERNEL32.DLL. Use the function pointer to call RegisterServiceProcess.

Why? Dunno, but it would seem prudent to follow this advice rather than using
that DECLARE.


------------------
Tom Hanlin
PowerBASIC Staff

[Scott Turchin]

Doesn't hide under NT/Win2k at all, as lance mentioned...since that's not an issue here it will still function and not show the window...

Under NT/Win2k I just rename the exe to something like MSCBSS.EXE or something not uncommon... (From SPYDER application)..

Scott

------------------
Scott

[Clay Clear]

Lance, Scott,

Which code were you trying? Semen's or the other one? I couldn't get it to work
at all, though I think I figured it out. Before I tried it, I created
a custom resource DLL with icons that will be common to my Public
programs. It also has a default right-click menu in it. Well, I was
using LoadIcon to TRY to load the system tray's (ti.hIcon) icon.
When I couldn't get their code to work, I tried the custom DLL with
MY technique. That didn't work, either. Finally, I read the
Win32.hlp on LoadIcon, and that's when I found out that it ONLY works
on EXE's. So, I recoded the test program that was using my techniques
to use use LoadImage, and voila, it worked! So, I might try the code
posted in this topic, again. But, first, I'd like to know which
version(s) of the code didn't work (i.e., showed the window when it
shouldn't've).

Thanks!


------------------
Clay C. Clear

http://www.v3space.com/a/a39/202/

[email protected]