Hi:
I've searched newsgroups and various archives, including MSDN & MFC sources,
but at this point failed to locate an accurate and simple implementation of
WndProc function for MSWindows window objects.
Something like:
class BaseWindow {
virtual LRESULT WndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM
lParam);
virtual OnPaint();
};
Then I would create a window pointing to a static StaticWndProc
static LRESULT CALLBACK StaticWndProc(H WND hwnd, UINT message, WPARAM
wParam, LPARAM lParam)
{
return DefWindowProc(h wnd, message, wParam, lParam);
}
But at certain point this static wndproc should be switched to the
BaseWindow::Wnd Proc or gain access to the instance of the BaseWindow object
somehow. What is the simplest technique to make it happen?
So far, I figured only a way to throw an exclusive global pointer of this to
GWL_USERDATA and retrieve the object instance from it within every event
thrown to the static window procedure.
BaseWindow* g_window_ptr;
static LRESULT CALLBACK InitWndProc(HWN D hwnd, UINT message, WPARAM wParam,
LPARAM lParam)
{
SetWindowLong( hWnd, GWL_USERDATA, (long) g_window_ptr );
SetWindowLong( hWnd, GWL_WNDPROC, (long) StaticWndProc__ v2 );
return DefWindowProc(h wnd, message, wParam, lParam);
}
static LRESULT CALLBACK StaticWndProc__ v2(HWND hwnd, UINT message, WPARAM
wParam, LPARAM lParam)
{
BaseWindow* l_window_ptr = (BaseWindow *) GetWindowLong( hWnd,
GWL_USERDATA );
return l_window_ptr->WndProc(hwnd , message, wParam, lParam);
}
What other simple ways do you use to build windows classes, inheriting
WndProc and event handlers? 6 6634
Check http://www.codeproject.com/system/chotkeyhandler.asp
It got an implementation of WndProc inside a C++ class.
--
Elias
"Beach Potato" <do************ *************** @yahoo.com> wrote in message
news:i8******** ********@newsre ad4.news.pas.ea rthlink.net... Hi:
I've searched newsgroups and various archives, including MSDN & MFC
sources, but at this point failed to locate an accurate and simple implementation
of WndProc function for MSWindows window objects. Something like:
class BaseWindow { virtual LRESULT WndProc( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam); virtual OnPaint(); };
Then I would create a window pointing to a static StaticWndProc
static LRESULT CALLBACK StaticWndProc(H WND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { return DefWindowProc(h wnd, message, wParam, lParam); }
But at certain point this static wndproc should be switched to the BaseWindow::Wnd Proc or gain access to the instance of the BaseWindow
object somehow. What is the simplest technique to make it happen?
So far, I figured only a way to throw an exclusive global pointer of this
to GWL_USERDATA and retrieve the object instance from it within every event thrown to the static window procedure.
BaseWindow* g_window_ptr; static LRESULT CALLBACK InitWndProc(HWN D hwnd, UINT message, WPARAM
wParam, LPARAM lParam) { SetWindowLong( hWnd, GWL_USERDATA, (long) g_window_ptr ); SetWindowLong( hWnd, GWL_WNDPROC, (long) StaticWndProc__ v2 ); return DefWindowProc(h wnd, message, wParam, lParam); }
static LRESULT CALLBACK StaticWndProc__ v2(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { BaseWindow* l_window_ptr = (BaseWindow *) GetWindowLong( hWnd, GWL_USERDATA ); return l_window_ptr->WndProc(hwnd , message, wParam, lParam); }
What other simple ways do you use to build windows classes, inheriting WndProc and event handlers?
Beach Potato wrote: Hi:
I've searched newsgroups and various archives, including MSDN & MFC sources, but at this point failed to locate an accurate and simple
This group is for the standard C++ languge and not Windows programming.
Please read this for pointers: http://www.slack.net/~shiva/welcome.txt
--
WW aka Attila
"Beach Potato" <do************ *************** @yahoo.com> wrote So far, I figured only a way to throw an exclusive global pointer of this to GWL_USERDATA and retrieve the object instance from it within every event thrown to the static window procedure.
[...] What other simple ways do you use to build windows classes, inheriting WndProc and event handlers?
One other way is to use a global 'std::map <HWND, BaseWindow*>'.
Regards,
Buster.
On Sun, 21 Sep 2003 21:56:30 GMT, "Beach Potato" <do************ *************** @yahoo.com> wrote: ... What other simple ways do you use to build windows classes, inheriting WndProc and event handlers?
As Attila Fehler wrote, this question is _off-topic_ in clc++.
Try to ask in [comp.os.ms-windows.program mer.win32], and please do read
Shiva's welcome-message as well as the FAQ before posting more in clc++.
This response has been crossposted to [comp.os.ms-windows.program mer.win32],
with follow-ups set there (that means if you answer, your answer will by
default be submitted to that group).
Hth.,
- Alf
> One other way is to use a global 'std::map <HWND, BaseWindow*>'.
The question is at what point and where I'd tie these two together.
CreateWindow throws a bunch of calls, like WM_NCCREATE, WM_CREATE before
releasing the handle to the caller.
So if I do:
void BaseWindow::Ini t() {
HWND hWnd = CreateWindow();
... <- manupulate with the map
}
it may be too late, and I'll miss the events. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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