Edit Box data input and output hexadecimal formatted data

[Freddie Code]

I'm very familiar with C/C++ Console Applications and Visual Basic programming. I'm having a tought time with Visual C++ Edit Boxes. I can't figure out how to format an editbox for hexadecimal data, input data and output data. I downloaded a few tutorials and demos on edit boxes, which were a great start for edit boxes in general, but none specifically address this topic. Here is what I'm trying to do.... Supposing that you have a form with 3 edit boxes and a button. The user will input a 1 byte hexadecimal number into edit box1 and edit box2. When the user clicks the button, the hexadecimal values in edit box1 will be subtracted from the value in edit box2. The answer will be displayed in hexadecimal format in edit box3. One other thig is that I want to filter the input data "on the fly", only allowing the user to type the numbers and characters 0,1,2,3,4,5,6,7,8,9,A,B,C,D,E,F into edit box1 and edit box2. Any other letters will be rejected and not accpted. If anyone has some simple code examples that can help me I'd greatly appreciate it. Thanks.. Freddie.:confused: