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A range validation Edit control

Posted by Donald R. Kichline on August 6th, 1998
Download Source Code and Example


In a project that I am working with about 6 people, we were using spin controls and edit controls to allow the operator to change certain values. We decided we needed one way to handle invalid data typed in the edit control by the operator. The best solution we came up with was to sub-class CEdit, and validate the operators key-strokes.

  1. Ensure that the edit control has the number only style set to TRUE.
  2. Then you need to include the "CRangeEdit.h" in your dialog definition file, and declare CRangeEdit member variables for each edit control that you need to check the range of an operators input.
  3. Then you must set the range the CRangeEdit will accept from the operator, using the CRangeEdit::SetRange() method. The CRangeEdit will default to 0-100 range.
  4. Set the default contents of the control using CWnd::SetWindowText().

You should be ready to go!

Last updated: 29 April 1998

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Comments

  • Why not DDV??

    Posted by zmdmustafa on 04/08/2004 05:02am

    With the help of class wizard we can use DDV to handle the same, why to take all these pain?

    Reply

  • Question

    Posted by Legacy on 08/06/2002 12:00am

    Originally posted by: Ramesh

    I have an Edit Control in VC++, and I basically use it for logging. So I assign the member variable to the log info I wanr and then I use the UpdateData(FALSE).
    Now the proble I have is I want the new line charter to function as new line, but instead it display some special character there. How do I send a new line character to my Edit Control.

    Reply

  • Min Max

    Posted by Legacy on 06/06/2002 12:00am

    Originally posted by: Derrick

    I think your idea is great but, there is still a small problem. The code works fine when setting a MIN value of 0 but anything above the code doesn't work properly.

    • trail

      Posted by mallikarjuna_kilari on 08/05/2007 11:45am

      just for checking i asked that que.

      Reply
    Reply

  • ExEditors Library

    Posted by Legacy on 03/19/2002 12:00am

    Originally posted by: Mike Philips 

    A complete collection of editors in a single file:


    http://www.exontrol.com/sg.jsp?content=products/exeditors


    Regards, 

    Mike

    Reply

  • A little enhancement

    Posted by Legacy on 08/06/1999 12:00am

    Originally posted by: Marcelo Rego 

    I found your code very useful, however I

    had need to output an error message to user

    and not just the "windows beep".

    So, I just added a SetErrorMsg to your code, which

    tells CRangeEdit which error message to display.

    Here are some pieces of the code (mixed with the

    original).


    .....

    .....

    // Implementation

    	void SetRange ( LONG inLMin, LONG inLMax );

    	void SetErrorMsg(CString ErrorMessage);


    private:

    //  Implementation

    	void RemoveLeadingZeros ( void );


    //	Attributes

    	LONG	myMax;	

    	LONG	myMin;	

    	LONG	myLastValidValue;	

    	CString ErrorMsg;


    ....

    ....


    void CRangeEdit::SetErrorMsg(CString ErrorMessage)

    {

    ErrorMsg = ErrorMessage;

    }


    

    And, you should substitute the MessageBeep(XXX)

    for something like an AfxMessageBox(ErrorMsg).

    Reply
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