PChar

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A PChar is Data type and a Pointer to a null-terminated string. The most important application of a PChar is interaction with system libraries like dll's.

Messagebox:

var 
  s: String;
begin
  s := 'Test';
  Application.MessageBox( PChar(s)),'Title', MB_OK );
end;

Declaration:

var 
  p: PChar;

Valid assignments:

   p := 'This is a null-terminated string.';
   p := IntToStr(45);

Invalid assignments:

   p := 45;

The integer value is not casted to a PChar as might be expected.

See also