WM_COMMAND catching

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Rayslava

Joined: 07 Mar 2006
Posts: 7
Location: Moscow, Russia

Rayslava 07 Mar 2006, 20:45

So I'm a newbie in winapi programming and I've got a question:
I have a window and a LISTBOX on it, my aim is to get clicks and keyboard shortcuts from it.
So i am catching a WM_COMMAND message, then I filter message from my listbox thet way

Code:

cmp     ebx,[edithwnd]
je        edit

And then after the label `edit` I don't know what to do...

Code:

cmp     [wparam],WM_LBUTTONDOWN
je        about

doesn't work as I say.
P.S.
Please don't laugh at me and forward to Google, RTFM etc.
Cool

07 Mar 2006, 20:45

Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc 07 Mar 2006, 21:02

IIRC you need WM_KEYDOWN or WM_KEYUP or WM_CHAR for keyboard, not WM_COMMAND. Or did I misunderstand something? Post some code, maybe there's an easier way?

07 Mar 2006, 21:02

Reverend

Joined: 24 Aug 2004
Posts: 408
Location: Poland

Reverend 07 Mar 2006, 21:34

Win32 Reference wrote:

WM_COMMAND
wNotifyCode = HIWORD(wParam); // notification code
wID = LOWORD(wParam); // item, control, or accelerator identifier
hwndCtl = (HWND) lParam; // handle of control

Let's say you have your WinProc defined like: hwnd, umsg, wparam, lparam. So:
hwnd = hwnd Smile

umsg = WM_COMMAND
wparam.hiword = notification code
wparam.loword = item id
lparam = control's hwnd

I suggest checking first the 'umsg' value for WM_COMMAND and then 'lparam' for the handle of listbox (or whatever). If both compares match you can be sure that someone clicked/focused/etc. on your listbox Smile

07 Mar 2006, 21:34

Rayslava

Joined: 07 Mar 2006
Posts: 7
Location: Moscow, Russia

Rayslava 08 Mar 2006, 06:31

Code:

proc WindowProc, hwnd,wmsg,wparam,lparam

        push    ebx esi edi
        mov     eax,[wmsg]
...
        cmp     eax,WM_COMMAND
        je      wmcommand
...

That's beginning of windowproc.

Code:

wmcommand:
        mov     ebx,[lparam]

        cmp     ebx,[edithwnd]
        je      edit

And this part also works fine.

Code:

 edit:
        cmp     [wparam],WM_LBUTTONDOWN
        je      about
        jmp     finish

And I have a suspicion, that in this part I'd use

Quote:

wNotifyCode = HIWORD(wParam);

.
I've read the manual, but what I have to compare NotifyCode with?
It's clear to me that my bug is hiding over here, but...

08 Mar 2006, 06:31

shoorick

Joined: 25 Feb 2005
Posts: 1614
Location: Ukraine

shoorick 08 Mar 2006, 08:52

for me it is not clear what exactly you do and what exactly you wish to do. what "edithwnd" means if you say about there is a list box? and what WM_COMMAND are you expecting from listview? zip your code please and post, and tell specific what behavior you are expecting of it.
regards!

08 Mar 2006, 08:52

shoorick

Joined: 25 Feb 2005
Posts: 1614
Location: Ukraine

shoorick 08 Mar 2006, 08:54

wNotifyCode = HIWORD(wParam); >

movzx eax,word [wParam + 2]

08 Mar 2006, 08:54

Rayslava

Joined: 07 Mar 2006
Posts: 7
Location: Moscow, Russia

Rayslava 08 Mar 2006, 09:48

Quote:

I have a window and a LISTBOX on it, my aim is to get clicks and keyboard shortcuts from listbox.

I get WM_COMMAND message, I can filter messages from my listbox, using lparam and then Program should select if the message is WM_LBUTTONDOWN or another... So my only problem is to get WM_message number from wparam.
For example there is a notify Message BN_CLICKED, but what messages I should check to get mouse clicks, keyboard buttons and how to convert wmNotify codes to WM_messages?
For example, how could I get a key that was pressed in the listbox window?

Description:	Source	Download
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08 Mar 2006, 09:48

Reverend

Joined: 24 Aug 2004
Posts: 408
Location: Poland

Reverend 08 Mar 2006, 19:56

Possible wNotfyCode values: (check win32 reference for their meaning)
LBN_DBLCLK
LBN_ERRSPACE
LBN_KILLFOCUS
LBN_SELCANCEL
LBN_SELCHANGE
LBN_SETFOCUS

Example. Let's say you want to catch when someone doubleclicks on your listbox. First, catch WM_COMMAND (in [umsg]), then check listbox handle (in [lparam]) and then LBN_DBLCLK (in word [wparam + 2]). If all these conditions are met - someone doubleclicked the listbox.

And something from my coding experience. Most of the time I just skip wNotifyCode checking. Usually I just process the message if it's WM_COMMAND and if the handle match. But if you must eg. differ between single- and doubleclick then freely try the combination with wNotifyCode.

08 Mar 2006, 19:56

shoorick

Joined: 25 Feb 2005
Posts: 1614
Location: Ukraine

shoorick 09 Mar 2006, 05:54

as far as i know there is no WM_COMMAND sent to the parent window when you press a key within the list box: that message will be sent by buttons, accelerators, menus. to catch listview notification messages you have to process WM_NOTIFY message: check for LVN_KEYDOWN for key pressed.

09 Mar 2006, 05:54

shoorick

Joined: 25 Feb 2005
Posts: 1614
Location: Ukraine

shoorick 09 Mar 2006, 06:13

when enter pressed in listview and not processed by it, then WM_COMMAND with wParam=IDOK will sent to the parent window. to catch VK_RETURN in listview you have to subclass listview and return DLGC_WANTALLKEYS to WM_GETDLGCODE message in subclassed routine. check there: http://board.flatassembler.net/topic.php?t=4786

09 Mar 2006, 06:13

Rayslava

Joined: 07 Mar 2006
Posts: 7
Location: Moscow, Russia

Rayslava 09 Mar 2006, 10:22

Thanks

09 Mar 2006, 10:22

shoorick

Joined: 25 Feb 2005
Posts: 1614
Location: Ukraine

shoorick 09 Mar 2006, 13:45

as well as i've been mixing listbox and listview and thus misguided you a little, so, here is my little help: a box working i think as well as you hope (just not with colour). also, i saw your source: you have to use FindClose when you finish use handle with FindNext.

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09 Mar 2006, 13:45

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