 7

 
 

7.1    
 

      --
  .   C++Builder  
;;,   Borland,    , 
   .        
  API Windows,       C++. 
              
   ,    .

 C++Builder      
.( :

       

      

    

        

     DLL

   (packages)

       
     .    
      ,   -
    .   ,  
    .

7.2     

       
       -
  . ,   ,   .   -
    Edit   ,   -
      , ..      
,  .  ,     Enter -
       -
.   , ,  .

         Edit.  -
   OnKeyPress  

Set <char, '0', '9'> Dig;

if ( ! (Dig  '0'  '1'  '2'  '3'  '4'  '5'

 '6'  '7'  '8'  '9').Contains(Key))

Key = 0;

;i    OnKeyDown  :