Microsoft KB Archive/125645

= FIX: Edit Control in Property Page Does Not Get Return Keys =

Article ID: 125645

Article Last Modified on 11/21/2006

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APPLIES TO


 * Microsoft Foundation Class Library 4.2, when used with:
 * Microsoft Visual C++ 2.0 Professional Edition

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This article was previously published under Q125645



SYMPTOMS
A multiline edit control with the ES_WANTRETURN style set does not receive return key messages (WM_KEYDOWN with VK_RETURN) when placed in a CPropertyPage. If there is an IDOK button on the parent CPropertySheet, the dialog box will be dismissed when the ENTER key is pressed in the edit control.



CAUSE
The WM_KEYDOWN message is pre-translated in the PreTranslateMessage function of CPropertyPage to perform default pushbutton handling. A consequence of this is that the VK_RETURN key will never be sent to a child control in a CPropertyPage.



RESOLUTION
To work around this problem, you can override the PreTranslateMessage function in your CPropertyPage derived class. In this function, you can check whether the control is an edit control and determine whether it should receive the WM_KEYDOWN message when the ENTER key is pressed.

NOTE: This problem may occur with other controls as well. You can check whether they need the message by sending a WM_GETDLGCODE message to the control and looking for DLGC_WANTALLKEYS or DLGC_WANTMESSAGE. The PreTranslateMessage function, which would accomplish both of these tasks, is included here: BOOL CMyPropertyPage::PreTranslateMessage(MSG *pMsg) {   if(pMsg->message==WM_KEYDOWN && pMsg->wParam==VK_RETURN) {       static const TCHAR szEdit[] = _T("edit"); TCHAR szCompare[sizeof(szEdit)+1]; HWND hFocus = ::GetFocus;

// Check for "edit" controls which want the RETURN key. // If it doesn't want the return key then let it be       // translated by just calling // CPropertyPage::PreTranslateMessage ::GetClassName(hFocus, szCompare, sizeof(szCompare)); if (lstrcmpi(szCompare, szEdit) == 0) {           if(::GetWindowLong(hFocus, GWL_STYLE) & ES_WANTRETURN) return FALSE;   // Don't translate...just send on                                 // to control else return CPropertyPage::PreTranslateMessage(pMsg); }

// Check for other controls which want the return key if (::SendMessage(hFocus,WM_GETDLGCODE,0,0) &          (DLGC_WANTALLKEYS | DLGC_WANTMESSAGE)) return FALSE;       // Don't translate it        };

return CPropertyPage::PreTranslateMessage(pMsg); }



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was corrected in Visual C++ version 2.1 for Windows NT.

Additional query words: 2.00 3.00

Keywords: kbbug kbfix KB125645

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