Combo Box Problem

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Razneb

Joined: 10 Feb 2005
Posts: 12

Razneb

My problem is that even though I send a message to the control's handle, it does't add the string to the combo box's list. Here's my code.

Code:

stdcall control,Cmb1Handle,CmbClassName,NULL,WS_CHILD+WS_VISIBLE+CBS_DROPDOWNLIST,[hWnd],16,140,130,25,1005
        invoke SendMessage,[Cmb1Handle],CB_SETITEMDATA,0,Cmb1Title
        invoke SendMessage,[Cmb1Handle],CB_ADDSTRING,0,Cmb2Title

I know it's not the call to the control procedure, that works just fine. Other than that I have no idea what the problem is. I've tried alot of things, like just sending the CB_ADDSTRING message, etc.

Any help would be appreciated. Thanks in advanced.

12 Apr 2005, 02:09

coconut

Joined: 02 Apr 2004
Posts: 326
Location: US

coconut

does your control proc return the handle of the newly created combobox? the sendmessage calls look ok, perhaps the error is elsewhere. show some more code, like the control proc

12 Apr 2005, 02:23

Razneb

Joined: 10 Feb 2005
Posts: 12

Razneb

My control procedure returns the control's handle to the target variable's address.

Code:

proc control,Handle,Class,lpText,Style,hParent,x,y,w,h,ID
    invoke CreateWindowEx,0,[Class],[lpText],[Style],[x],[y],[w],[h],[hParent],[ID],[hInstance],NULL
    mov ebx,[Handle]
    mov [ebx],eax
    invoke SendMessage,eax,WM_SETFONT,[hFont],0
    return
endp

12 Apr 2005, 02:29

IronFelix

Joined: 09 Dec 2004
Posts: 141
Location: Russia, Murmansk region

IronFelix

Try to use EDX or ECX register instead of EBX (EBX,ESI,EDI must be saved and restored in function, if you use them).
Regards.

12 Apr 2005, 08:41

Razneb

Joined: 10 Feb 2005
Posts: 12

Razneb

Still doesn't work, but thanks for the extra info IronFelix. I didn't know that.

12 Apr 2005, 21:01

coconut

Joined: 02 Apr 2004
Posts: 326
Location: US

coconut

i have modified your code as follows. the problem was in the height of the combobox, make it large enough to display items inside it

calling create_control:

Code:

 stdcall create_control,hwnd_cb,_class_cb,0,WS_CHILD+WS_VISIBLE+CBS_DROPDOWNLIST,[hwnd],16,40,130,100,1005
        ;invoke  SendMessage,[hwnd_cb],CB_SETITEMDATA,0,_title
        invoke  SendMessage,[hwnd_cb],CB_ADDSTRING,0,_class
        invoke  SendMessage,[hwnd_cb],CB_ADDSTRING,0,_class

and the create_control proc:

Code:

proc create_control,handle,_class_name,_caption,style,parent,x,y,w,h,control_id
        push    ebx esi edi
        invoke  CreateWindowEx,0,[_class_name],[_caption],[style],[x],[y],[w],[h],[parent],0,[hinstance],[control_id]
        mov     ecx,[handle]
        mov     [ecx],eax
        ;invoke  SendMessage,eax,WM_SETFONT,[hFont],0
        pop     edi esi ebx
        return
endp

Description:		Download
Filename:	CB.ASM
Filesize:	2.35 KB
Downloaded:	156 Time(s)

12 Apr 2005, 22:44

Razneb

Joined: 10 Feb 2005
Posts: 12

Razneb

Thanks for all the help, works fine now.

13 Apr 2005, 02:36

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