Restrict Textbox Input in C++

[dolfaniss]

I'm writing a simple calculation program using C++. I'd like to restrict my textboxes to only except valid hex numbers as input. Is there an easy way to do this? I will post code if necessary but my code is all under the calculation button and I think this needs to be put behind the textbox itself. The default VS 2008 code is all I have there now.

[bobknows]

are you using char or int for the input?
int wont accept letters

once you are using char just use an if statement or a switch like this:

char hexnumber[6]
for(int a = 0; a < 6; a++;
{
      cin << hexnumber[a];
      switch hexnumber[a]
      {
            case '1':
            case '2':
             ...... and do on,
                        then: 
            case 'F':
               break;
              default:
            cout << "that is invalid input try again";
            break;
       }

or test the whole input after you cin it,

i have no idea on how to do this in visual but it should be pretty easy to convert

[bithub]

I'm writing a simple calculation program using C++. I'd like to restrict my textboxes to only except valid hex numbers as input. Is there an easy way to do this? I will post code if necessary but my code is all under the calculation button and I think this needs to be put behind the textbox itself. The default VS 2008 code is all I have there now.

What UI library are you using? QT, WxWidgits, Win32, MFC, etc?

[dolfaniss]

Win32 library.

[bithub]

I believe you can do this by catching EN_UPDATE via WM_COMMAND, then modifying the edit control's text if it contains unwanted characters.

If this doesn't work, then I think you need to subclass the control and catch the keypress events.