Dialog Handle

[Hunk]

Is it possible to get the handle of a dialog box by using its Control ID only?

[fearless]

Could maybe use CreateDialogParam as it returns a handle to the dialog and uses the dialogs control id as a parameter: http://msdn.microsoft.com/en-us/library/windows/desktop/ms645445%28v=vs.85%29.aspx

Maybe something like:

Code Select Expand

MyOtherDlgProc PROTO :DWORD, :DWORD, :DWORD, :DWORD

.const
IDD_OTHERDIALOG EQU 1000 ; dialog resource is set to 1000

.data?
hOtherDlg dd ? ; dialog handle

.code
Invoke CreateDialogParam, hInstance, IDD_OTHERDIALOG, NULL, OFFSET MyOtherDlgProc, NULL
mov hOtherDlg, eax ; save as handle to dialog in our var
Also as an alternative you could always save your dialogs handle from WM_INITDIALOG of your dialog to a global var, that can be accessed easily?

Code Select Expand

.ELSEIF eax == WM_INITDIALOG
   mov eax, hWin
   mov hOtherDlg, eax ; got hWin for this dialog, so save it for later use

[dedndave]

GetDlgItem function (you need the handle of the parent window, of course)
it works for non-dialog windows, as well
http://msdn.microsoft.com/en-us/library/windows/desktop/ms645481%28v=vs.85%29.aspx

[fearless]

lol, i was just thinking that as well dave, GetDlgItem might be an easier option.

[donkey]

A dialog box does not in itself have a control ID, only controls have that. It does however have a resource ID and GetDlgItem will not return the handle of the dialog with that since it can be used to create multiple dialogs from a single resource. Since the resource ID is only used at creation to load the template and is not saved by Windows there is no way I know of to extract a handle from it. You will have to use fearless's suggestion and save the handle of the dialog when it is created or walk the window list for your program using FindWindow or some such function using the dialog title or class.

[dedndave]

it might, if it is a child window

i mean, apparently, he has a control ID of something and wants the handle   :bg

[donkey]

it might, if it is a child window   :P

Outside of simple tab controls I have never seen a dialog that has the WS_CHILD style set, though they may be used in property sheets, not much experience with those. I think he might be confusing a resource ID with a control ID.

[dedndave]

yah - the best way to get a dialog box handle is when you receive WM_INITDIALOG in the DialogProc
get it from the hwndDlg parameter and store it in a global

[NoCforMe]

You want the handle to a dialog box that's actually open, right? Well, it's not what you asked for, but it's really easy to get this, and you don't even need the dialog ID. Just  use

Code Select Expand


    INVOKE GetWindow, MainWinHandle, GW_ENABLEDPOPUP
    MOV dialogHandle, EAX


This gets the handle to the currently-enabled popup of your main window, which would be the dialog. Now, if you need to distinguish among several different dialogs which could be up, that's a different story, but if you know a particular dialog is open, this will get you its handle.