Difference between revisions of "PChar"
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(Content moved from "Pchar") |
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| − | + | {{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: | ||
| + | <syntaxhighlight> | ||
| + | var | ||
| + | s: String; | ||
| + | begin | ||
| + | s := 'Test' | ||
| + | Application.MessageBox( PChar(s)),'Title', MB_OK ); | ||
| + | end; | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | Declaration: | ||
| + | <syntaxhighlight> | ||
| + | var | ||
| + | p: PChar; | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | Valid assignments: | ||
| + | <syntaxhighlight> | ||
| + | p := 'This is a null-terminated string.'; | ||
| + | p := IntToStr(45); | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | Invalid assignments: | ||
| + | <syntaxhighlight> | ||
| + | p := 45; | ||
| + | </syntaxhighlight> | ||
| + | The integer value is not casted to a PChar as might be expected. | ||
| + | |||
| + | == See also == | ||
| + | * [[Character and string types]] | ||
| + | |||
| + | [[Category:Data types]] | ||
Revision as of 21:18, 21 July 2016
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.
