TEdit Input Validation on C++ Builder XE8

I am very new to C++ Builder XE8.

I want the minimum and maximum length of numbers that must be typed is as much as six numbers, also I need to make sure that only number is entered (0 is exception), and not an alphabetic character, backspace, punctuation, etc.

I would also like to produce an error box if anything other than a number is entered.

I've tried a few combinations of codes, three of which can be seen below, but none of those codes works.

Any help would sure be appreciated!

(1).

void __fastcall TForm1::Edit1KeyPress(TObject *Sender, System::WideChar &Key)
{
  Edit1->MaxLength = 6;

  if (!((int)Key == 1-9)) {
  ShowMessage("Please enter numerals only");
  Key = 0;
  }
}

(2).

void __fastcall TForm1::Edit1KeyPress(TObject *Sender, System::WideChar &Key)
{
  Edit1->MaxLength = 6;

  if (Key <1 && Key >9) {
  ShowMessage("Please enter numerals only");
  Key = 0;
  }
}

(3).

void __fastcall TForm1::Edit1KeyPress(TObject *Sender, System::WideChar &Key)
{
  Edit1->MaxLength = 6;

  if( Key == VK_BACK )
   return;

  if( (Key >= 1) && (Key <= 9) )
   {
  if(Edit1->Text.Pos(1-9) != 1 )
   ShowMessage("Please enter numerals only");
   Key = 1;
  return;
  }
}