OnChar/OnKeyDown (again...)
I need to handle a few command characters (like DEL and TAB) in a window and also some regular ones, like '+' and '-'. OnKeyDown appears to detect them all but they are not translates, e.g. '-' comes in as 167 (IIRC). That's why you need OnChar, I suppose. I would be ok with having 2 handlers, but some chars (such as TAB) come properly translated through both, f*g up my program. (quite a nice framework, he?) Short of finding out on per-character basis whether a character is handled by both handlers and ignore it in one of them, is there a way to either know automatically whether a char is handled by both or translating the char to something readable right inside OnKeyDown? thanks, max
max7512
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"max" <max@nospam.com> schrieb im Newsbeitrag =
news:yljcb.28148$u67.1907@twister.nyc.rr.com...
: I need to handle a few command characters (like DEL and TAB) in a =
window=20
: and also some regular ones, like '+' and '-'. OnKeyDown appears to=20
: detect them all but they are not translates, e.g. '-' comes in as 167=20
: (IIRC). That's why you need OnChar, I suppose. I would be ok with =
having=20
: 2 handlers, but some chars (such as TAB) come properly translated=20
: through both, f*g up my program. (quite a nice framework, he?) Short =
of=20
: finding out on per-character basis whether a character is handled by=20
: both handlers and ignore it in one of them, is there a way to either=20
: know automatically whether a char is handled by both or translating =
the=20
: char to something readable right inside OnKeyDown?
: thanks,
: max
Alas, the inventors of the MFC did not provide a method for OnKeyDown to =
prevent further processing of a keystroke. But you can catch keystrokes =
before they are processed by the MFC.
Add PreTranslateMessage to your window class and process those =
keystrokes your recognize by their virtualkey code there, and process =
other keyboard input in OnChar.
BOOL CMyWnd::PreTranslateMessage(MSG* msg)
{
if (msg->message =3D=3D WM_KEYDOWN)
{
switch (msg->wParam)
{
case VK_TAB:
OnTabKeyDown();
break;
...
default:
return FALSE;
}
return TRUE;
}
return FALSE;
}
HTH
Heinz
wansor42
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Dear All. I'm using C++ .NET and trying to figure out how to read input from the keyboard. I use the following function: void CMyView::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) { TRACE(" ** key down!\n"); CFormView::OnKeyDown(nChar, nRepCnt, nFlags); } inside my code, but it doesn't seem to work.... And I also tried this following function to catch WM_KEYDOWN, but it also didn't work. :-( LRESULT CTestKbdState2View::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_KEYDOWN: TRACE(" ** key down!\n");...
OnKeyDown not getting called in a dialog-based app?
I'm writing a dialog-based app with quite a few different controls and gadets on the main page. I want to catch the "DEL" key so i can implement a delete function on selected items so I added a message handler to the main dialog frame to catch the WM_KEYDOWN message but it never gets called - i've checked the message map and everything seems to be in order. What am I missing? I've also got another smaller problem with keyboard input because the application will quit if ENTER or ESC is pressed (a bit harsh for my purposes). I stopped it quitting on ENTER by comme...
OnKeyDown not called for VK_DOWN or VK_RIGHT but is called for others.
In my Dialog App on Win98 VC6 MFC, my OnKey is not called for VK_DOWN or VK_RIGHT but is called for others including VK_UP and VK_LEFT. Here is a portion of the Spy++ Log (I inserted blank lines to separate the key events). What could be causing this strange behavior? TIA Harvey ----- Spy Log: <00034> 0000030C P WM_KEYDOWN nVirtKey:'C' cRepeat:1 ScanCode:2E fExtended:0 fAltDown:0 fRepeat:0 fUp:0 <00035> 0000030C S WM_GETDLGCODE <00036> 0000030C R WM_GETDLGCODE fuDlgCode:0000 <00037> 0000030C P WM_CHAR chCharCode:'c' (99) cRepeat:1 ScanCode:2E fExtended:...
How to check "." character OnKeyDown event using PreTranslateMessa
I want to make a barrier for my CEdit control so that if user input "." character, it will be rejected. How to check it? I use the PreTranslateMessage like this: BOOL CEditExt::PreTranslateMessage(MSG* pMsg) { // TODO: ここに特定なコードを追加するか、もしくは基本クラスを呼び出してください。 if ( pMsg->message == WM_KEYDOWN ) { if ( pMsg->wParam == VK_RETURN ) { CString sText; sText.Empty(); if ( GetWindowTextLength() != 0 ) { GetWindowText(sText); m_pItem->m_dValue = atof(sText); } GetParent()->SetFocus(); return TRUE; } else if ( pMsg->wParam == VK_ESCAPE ) ...