Difference between revisions of "PChar"

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(Content moved from "Pchar")
m
Line 8: Line 8:
 
   s: String;
 
   s: String;
 
begin
 
begin
   s := 'Test'
+
   s := 'Test';
 
   Application.MessageBox( PChar(s)),'Title', MB_OK );
 
   Application.MessageBox( PChar(s)),'Title', MB_OK );
 
end;  
 
end;  

Revision as of 18:17, 23 January 2018

Template:Pchar

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