WndProc (stack clean up?)This is a discussion on WndProc (stack clean up?) within the ASM x86 ASM 370 forums in Programming Languages category; When using a window procedure, do I need to clean up the stack or will windows clean up the stack for me? Do I need the RET 16 or can I just RET? For example: WndProc: push ebp mov ebp, esp cmp [ebp+12], dword WM_CREATE ; window message jz wm_create jmp default wm_create: jmp default default: push dword [ebp+20] push dword [ebp+16] push dword [ebp+12] push dword [ebp+8] call [DefWindowProcA] leave ret 16... | ||||||||
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#1
07-30-2008, 09:02 PM
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 WndProc (stack clean up?) When using a window procedure, do I need to clean up the stack or will windows clean up the stack for me? Do I need the RET 16 or can I just RET? For example: WndProc: push ebp mov ebp, esp cmp [ebp+12], dword WM_CREATE ; window message jz wm_create jmp default wm_create: jmp default default: push dword [ebp+20] push dword [ebp+16] push dword [ebp+12] push dword [ebp+8] call [DefWindowProcA] leave ret 16  |
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#2
07-31-2008, 02:04 AM
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| Re: WndProc (stack clean up?) "bwaichu@yahoo.com" <spamtrap@crayne.org> wrote: > >When using a window procedure, do I need to clean up the stack or will >windows clean up the stack for me? Do I need the RET 16 or can I just >RET? You need the "RET 16". The standard calling sequence in Win32 uses "callee cleanup". -- Tim Roberts, timr@probo.com Providenza & Boekelheide, Inc. |
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#3
07-31-2008, 07:41 AM
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| Re: WndProc (stack clean up?) On Wed, 30 Jul 2008 18:02:04 -0700 (PDT), "bwaichu@yahoo.com" <spamtrap@crayne.org> wrote: >When using a window procedure, do I need to clean up the stack or will >windows clean up the stack for me? Do I need the RET 16 or can I just >RET? > >For example: > >WndProc: > > push ebp > mov ebp, esp > > cmp [ebp+12], dword WM_CREATE ; window message > jz wm_create > jmp default > >wm_create: > > jmp default > >default: > > push dword [ebp+20] > push dword [ebp+16] > push dword [ebp+12] > push dword [ebp+8] > call [DefWindowProcA] > > leave > ret 16 > I don't know about other assemblers, but in MASM you can use a PROTO to take care of all this automatically. Best regards, Bob Masta DAQARTA v4.00 Data AcQuisition And Real-Time Analysis www.daqarta.com Scope, Spectrum, Spectrogram, Sound Level Meter FREE Signal Generator Science with your sound card! |
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#4
08-04-2008, 10:22 PM
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| Re: WndProc (stack clean up?) Yes, PROTO works if you don't forget to tell MASM to ".model flat, stdcall" in the beginning of the source file. It’s the 'stdcall' that does the trick here. "Bob Masta" <NoSpam@daqarta.com> wrote in message news:4891a453.746852@news.sysmatrix.net... > On Wed, 30 Jul 2008 18:02:04 -0700 (PDT), "bwaichu@yahoo.com" > <spamtrap@crayne.org> wrote: > >>When using a window procedure, do I need to clean up the stack or will >>windows clean up the stack for me? Do I need the RET 16 or can I just >>RET? >> >>For example: >> >>WndProc: >> >> push ebp >> mov ebp, esp >> >> cmp [ebp+12], dword WM_CREATE ; window message >> jz wm_create >> jmp default >> >>wm_create: >> >> jmp default >> >>default: >> >> push dword [ebp+20] >> push dword [ebp+16] >> push dword [ebp+12] >> push dword [ebp+8] >> call [DefWindowProcA] >> >> leave >> ret 16 >> > > I don't know about other assemblers, but in MASM you can use a PROTO > to take care of all this automatically. > > Best regards, > > > Bob Masta > > DAQARTA v4.00 > Data AcQuisition And Real-Time Analysis > www.daqarta.com > Scope, Spectrum, Spectrogram, Sound Level Meter > FREE Signal Generator > Science with your sound card! > |
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