Difference between revisions of "PChar"
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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
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.