Numbers as only valid input in edit control

This is a discussion on Numbers as only valid input in edit control within the Windows Programming forums, part of the Platform Specific Boards category; Im having issues with allowing the users only to enter a number in an edit control. I tried using IsDigit(value) ...

  1. #1
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    Numbers as only valid input in edit control

    Im having issues with allowing the users only to enter a number in an edit control. I tried using IsDigit(value) but has trouble when the number when negative.

    Is there a valid way of allowing the user to only enter numbers but without limiting to positive? I wanted to avoid having a second option they would have to check for negative / positive.

    Code:
    switch (message)
    	{
    	case WM_INITDIALOG:
    		SetDlgItemInt(hDlg, IDC_XVECTOR, theDoc.hBall.sBallVec.cx, TRUE);
    		SetDlgItemInt(hDlg, IDC_YVECTOR, theDoc.hBall.sBallVec.cy, TRUE);
    		return TRUE;
    
    	case WM_COMMAND:
    		if (LOWORD(wParam) == IDOK) 
    		{
    			LONG tempX = GetDlgItemInt(hDlg, IDC_XVECTOR, FALSE, TRUE);
    			LONG tempY = GetDlgItemInt(hDlg, IDC_YVECTOR, FALSE, TRUE);
    			
    			if(tempX < -10)
    				theDoc.hBall.sBallVec.cx = -10;
    			else if(tempX > 10)
    				theDoc.hBall.sBallVec.cx = 10;
    			else
    				theDoc.hBall.sBallVec.cx = tempX;
    
    			if(tempY < -10)
    				theDoc.hBall.sBallVec.cy = -10;
    			else if(tempY > 10)
    				theDoc.hBall.sBallVec.cy = 10;
    			else
    				theDoc.hBall.sBallVec.cy = tempY;
    
    			EndDialog(hDlg, LOWORD(wParam));
    			InvalidateRect(hDlg, NULL, TRUE);
    			return TRUE;
    		}
    		else if(LOWORD(wParam) == IDCANCEL)
    		{
    			EndDialog(hDlg, LOWORD(wParam));
    			return TRUE;
    		}
    		break;
    	}
    	return FALSE;

    thanks

  2. #2
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    Have you considered subclassing the edit control to only allow input of 0 thru 9 and the - character?

  3. #3
    Tropical Coder Darryl's Avatar
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    set its window style to ES_NUMBER

  4. #4
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    set its window style to ES_NUMBER
    Nope, I was thinking more along the lines of this example

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