how to determine type of input

[ShawnCoutts]

I need to be able to determine whether or not the user has entered the correct type of input into my TEdit field.
How can i check to make sure that it is an integer or double?

 

[TonyGroves]

You could instead use a TMaskEdit which will accept only certain types of input depending on the mask you define. Otherwise, you could wrap a AnsiString::ToInt() or ToDouble() in a try/catch block; an exception will be thrown if the data is invalid.

 

[2ffat]

Personally, I prefer the try/catch with the To... functions. I've not had much luck with the masks. Just my two cents worth.


James P. Cottingham
-----------------------------------------
[sup]I'm number 1,229!
I'm number 1,229![/sup]

 

[ShawnCoutts]

Thanks to both of you, but i figured out another way. When the edit control is pressed is clicked, a keypad pops up, so i only allow specific characters on the keypad to be input into the edit, and everything else does nothing.

Thanks anyhow though

 

[Prattaratt]

Here's my solution:

void __fastcall TNumEdit::KeyPress(char &Key)
{
  if (Key > 57)
  {
    Key = 0;
    return;
  };
  if (Key < 44)
  {
    char Tmp = 0;
    switch (Key)
    {
     case 8:
     case 9:
     case 13:
     {
       Tmp = Key;
       break;
     };
    };
    Key = Tmp;
    if (Key == 0)
      return;
  };
  if (OnKeyPress != NULL)
  {
    OnKeyPress(Owner,Key);
  }
};

This allows the entry of numbers, commas, periods and minus signs into the edit box. It also allows default processing of the backspace, tab and enter key

The simplest solution is the best!

 

[2ffat]

Cool! I hadn't thought about that.


James P. Cottingham
-----------------------------------------
[sup]I'm number 1,229!
I'm number 1,229![/sup]

 

[ShawnCoutts]

thats about what my solution was. Thanks for all your help