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   ► KBProgrammingDelphi for W...Language Det...   Print This     
  From the February 2011 Issue of Prestwood eMag
Delphi Language Details:
Pascal and PChar Strings
Posted 16 years ago on 3/18/2003 and updated 12/12/2006
Take Away: Using Pascal and PChar strings in Delphi.


ObjectPascal has two varieties of string variables: Pascal strings and Pchar strings. PChar strings are also known as null terminated strings because the last character in memory is always the null character (ASCII 0).

Using Pascal strings

The first character in memory is used to store the length of the string. Because this character is an unsigned short integer it is limited to 255 characters; unsigned short integers have a range from 0 to 255.


procedure TForm1.Button3Click(Sender: TObject);


   sPascalType: String[20];


   sPascalType := 'Felina Prestwood';



Using PChar strings

Here are some examples:


   s: String;





   s2: PChar;


for example, type in the following code.


procedure TForm1.Button4Click(Sender: TObject);


   s1: String;

   s2: PChar;


   s1 := 'Felicia Prestwood';

   s2 := 'Felina Prestwood';






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Comment 1 of 1
I've compiled my application in delphi 7. i received a warning that states Unsafe type 'PChar'.. what should i do?
Posted 15 years ago
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