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Modifying User Input in an Edit Control

Posted on 2003-02-24
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Last Modified: 2013-11-20
I have made modified control class based on the Edit Control.  My main objective is to limit the user to only enter hexidecimal digits (0-9A-F).  I have successfully done this by making my own WM_CHAR message handler.  What I want to do now is allow the user to enter a-f but have the message handler interpret it as A-F (i.e. make all the characters capital letters).  I have tried the following and it does not work.


void CMyEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
  if ('a'==nChar)
     CEdit::OnChar('A',nRepCnt,nFlags);
}

This is only a subset of the actual code.  Are there any other ways to accomplish this.
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Question by:davidzier
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4 Comments
 

Expert Comment

by:abelblaine111
ID: 8014872
Try this function.

LPTSTR CharUpper(LPTSTR lpsz );

with that you should be able to pass it either a string or char and get back all Uppercase.  Then you don't even need to check to see if something is lower case.  If it passes the test of a-f then just capitalize it with CharUpper and pass it.
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LVL 48

Accepted Solution

by:
AlexFM earned 200 total points
ID: 8014911
Use ES_UPPERCASE CEdit style.
0
 

Author Comment

by:davidzier
ID: 8020576
To abelblaine111:
I could not accept your answer becuase there there is no easy way, from what I can tell, to use the CharUpper.  Note that the value I get from nChar is an integer and not a string.  Additionally, what I am doing in my code is the same thing, except I am brute forcing the result.
0
 

Author Comment

by:davidzier
ID: 8020590
This was just the most simplist and accurate result.  So simple in fact, that I completely overlooked that the CEdit class has this style tag.  I have done this and it works perfectly now.  Thank you :)

DZ
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