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Modifying User Input in an Edit Control

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.

abelblaine111

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.

ASKER CERTIFIED SOLUTION

AlexFM

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davidzier

ASKER

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.

davidzier

ASKER

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