Hi
I am having an issue with a window I am creating - in its wndproc, if I call
PostMessage(hWn d, WM_QUIT, 0, 0) in response to WM_DESTROY, then GetMessage
returns a non-zero value and the loop carries on. But if I post quit message
in response to WM_CLOSE - it works fine!
I thought you were supposed to post WM_QUIT in response to WM_DESTROY though?
4  2115 
You're not supposed to use PostMessage for WM_QUIT. Use PostQuitMessage
instead.
"Bonj" <Bo**@discussio ns.microsoft.co m> wrote in message
news:E6******** *************** ***********@mic rosoft.com... Hi
I am having an issue with a window I am creating - in its wndproc, if I
call
PostMessage(hWn d, WM_QUIT, 0, 0) in response to WM_DESTROY, then
GetMessage
returns a non-zero value and the loop carries on. But if I post quit
message
in response to WM_CLOSE - it works fine!
I thought you were supposed to post WM_QUIT in response to WM_DESTROY
though?
Please read my other posts on the same issue for the reasons as to why I don't.
"Alexander Grigoriev" wrote: You're not supposed to use PostMessage for WM_QUIT. Use PostQuitMessage
instead.
"Bonj" <Bo**@discussio ns.microsoft.co m> wrote in message
news:E6******** *************** ***********@mic rosoft.com... Hi
I am having an issue with a window I am creating - in its wndproc, if I
call
PostMessage(hWn d, WM_QUIT, 0, 0) in response to WM_DESTROY, then
GetMessage
returns a non-zero value and the loop carries on. But if I post quit
message
in response to WM_CLOSE - it works fine!
I thought you were supposed to post WM_QUIT in response to WM_DESTROY
though?
Anyway, during WM_DESTROY, HWND may be already invalid. Actually, the reason
for failure is that when you do GetMessage, the window will already be
destroyed and the message will be discarded as invalid.
You're better with PostThreadMessa ge(GetCurrentTh readId(), WM_QUIT).
"Bonj" <Bo**@discussio ns.microsoft.co m> wrote in message
news:58******** *************** ***********@mic rosoft.com... Please read my other posts on the same issue for the reasons as to why I
don't.
"Alexander Grigoriev" wrote:
You're not supposed to use PostMessage for WM_QUIT. Use PostQuitMessage
instead.
"Bonj" <Bo**@discussio ns.microsoft.co m> wrote in message
news:E6******** *************** ***********@mic rosoft.com... > Hi
> I am having an issue with a window I am creating - in its wndproc, if I
> call
> PostMessage(hWn d, WM_QUIT, 0, 0) in response to WM_DESTROY, then
> GetMessage
> returns a non-zero value and the loop carries on. But if I post quit
> message
> in response to WM_CLOSE - it works fine!
> I thought you were supposed to post WM_QUIT in response to WM_DESTROY
> though?
>
>
I eventually found the cause of this ish.
It was that I was calling
while(GeMessage (&msg, hWnd, 0, 0) != 0)
instead of
while(GetMessag e(&msg, NULL, 0, 0) != 0)
and due to this, PostQuitMessage doesn't actually post a message to the
hWnd, just to the thread. So the WM_QUIT message was being issued correctly,
it just wasn't getting through!
"Alexander Grigoriev" <al***@earthlin k.net> wrote in message
news:u4******** ******@TK2MSFTN GP09.phx.gbl... Anyway, during WM_DESTROY, HWND may be already invalid. Actually, the
reason for failure is that when you do GetMessage, the window will already
be destroyed and the message will be discarded as invalid.
You're better with PostThreadMessa ge(GetCurrentTh readId(), WM_QUIT).
"Bonj" <Bo**@discussio ns.microsoft.co m> wrote in message
news:58******** *************** ***********@mic rosoft.com... Please read my other posts on the same issue for the reasons as to why I
don't.
"Alexander Grigoriev" wrote:
You're not supposed to use PostMessage for WM_QUIT. Use PostQuitMessage
instead.
"Bonj" <Bo**@discussio ns.microsoft.co m> wrote in message
news:E6******** *************** ***********@mic rosoft.com...
> Hi
> I am having an issue with a window I am creating - in its wndproc, if
> I
> call
> PostMessage(hWn d, WM_QUIT, 0, 0) in response to WM_DESTROY, then
> GetMessage
> returns a non-zero value and the loop carries on. But if I post quit
> message
> in response to WM_CLOSE - it works fine!
> I thought you were supposed to post WM_QUIT in response to WM_DESTROY
> though?
>
>
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