catch for letters or empty 1

[rzrdigo]

Using an EditBox, is it possible to catch weather what is written in the Edit is a letter or a number and if it is empty too?

 

[smays]

To check if the Edit box is empty:

bool bIsEmpty = Edit1->Text.IsEmpty();

bIsEmpty is TRUE IF Edit1->Text is genuinely empty. I highly recommend you study the AnsiString class member methods. You will find a wealth of functions.


To check whether the contents of the Edit box is a number or letter requires creativity.

You can scan each character contained in the Edit box AnsiString. You could also simply attempt to convert the contents of the Edit box into a number:

double dFloat;
int iInteger;
bool bIsFloat = false, bIsInteger = false;

try
{
  iInteger = Edit1->Text.ToInt();
  bIsInteger = true;
}
catch (...)
{
  try
  {
    dFloat = Edit1->Text.ToDouble();
    bIsFloat = true;
  }
  catch (...)
  {
  
  }
}