AfxMessageBox from a worker thread?
Erich Hermann
I have my main thread handling all the MFC-window stuff. In a worker
thread, started by the main-thread, I want to display a message box.
1. AfxMessageBox( "text" ) leads to an error deep in mfc-code
2. MessageBox( (HWND)AfxGetMainWnd(), "text", "heading", MB_XXX )
doesn't display a message box and returns immediatedly.
3. MessageBox( NULL, "text", "heading", MB_XXX ) displays the message
box behind the windows, i.e. can only be seen when changing via the
task list to the message-task.
3a. MB_XXX, all values are ignored: MB_OK, MB_TOPMOST, MB_SYSTEMMODAL,
...
- Why is version 1. not working?
- How can I display the message box in from of the apps window, so
that it can be seen by the user.
- Why are the MB_XXX's ignored in 3./3a.
Please help.
Erich
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John Fisher
<3608f044...@news.fr.bosch.de>...
>Hi,
>
>I have my main thread handling all the MFC-window stuff. In a worker
>thread, started by the main-thread, I want to display a message box.
>
>1. AfxMessageBox( "text" ) leads to an error deep in mfc-code
>
>2. MessageBox( (HWND)AfxGetMainWnd(), "text", "heading", MB_XXX )
>doesn't display a message box and returns immediatedly.
Number 2 is pretty close, change (HWND)AfxGetMainWnd() to
AfxGetMainWnd()->m_hWnd. That should work, but it might be better on
initialization of your thread to get the hWnd you desire and save it in a
member variable of the thread (if you know the window will stay there as
long as your thread needs it).
>
>3. MessageBox( NULL, "text", "heading", MB_XXX ) displays the message
>box behind the windows, i.e. can only be seen when changing via the
>task list to the message-task.
>
>3a. MB_XXX, all values are ignored: MB_OK, MB_TOPMOST, MB_SYSTEMMODAL,
>...
>
>- Why is version 1. not working?
It appears that your thread doesn't have a valid window for AfxMessageBox()
to use.
>
>- How can I display the message box in from of the apps window, so
>that it can be seen by the user.
>
>- Why are the MB_XXX's ignored in 3./3a.
No idea. Should be fixed with solution to number 2.
>
>Please help.
>
>Erich
--
John
God is the ultimate programmer. He designed the universe!
Uwe Kotyczka
the thread (via the ,say, m_pTrheadInfo) when calling it.
Did not try this, it's just an idea.
Erich Hermann schrieb:
> Hi,
>
> I have my main thread handling all the MFC-window stuff. In a worker
> thread, started by the main-thread, I want to display a message box.
>
> 1. AfxMessageBox( "text" ) leads to an error deep in mfc-code
>
> 2. MessageBox( (HWND)AfxGetMainWnd(), "text", "heading", MB_XXX )
> doesn't display a message box and returns immediatedly.
>
Erich Hermann
>Number 2 is pretty close, change (HWND)AfxGetMainWnd() to
>AfxGetMainWnd()->m_hWnd. That should work, but it might be better on
>initialization of your thread to get the hWnd you desire and save it in a
>member variable of the thread (if you know the window will stay there as
>long as your thread needs it).
AfxGetMainWnd()->m_hWnd is ok. But ...
>>- Why are the MB_XXX's ignored in 3./3a.
>
>No idea. Should be fixed with solution to number 2.
MB_XXX's are still ignored (I don't get the buttons, the icon, ...)
and I could not bring the message box in front of all the other
windows. Problem: when the message box is to be displayed, my
main-window may be behind some other windows or even hidden (SW_HIDE).
So I tried this, before opening the message box:
AfxGetMainWnd()->ShowWindow(SW_RESTORE);
if (IDNO == MessageBox( AfxGetMainWnd()->m_hWnd, s,
"Heading", MB_TOPMOST || MB_YESNO || MB_ICONHAND
|| MB_SYSTEMMODAL )) {
...
}
ARGHH, it works fine, if the window is hidden, but when it's
minimized, it's displayed behind the other windows!?! :-(
BTW, how do I get the display status of a Window?