Difference between revisions of "PChar"
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{{Pchar}} | {{Pchar}} | ||
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| + | Back to [[Data type|data types]]. | ||
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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. | 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: | Messagebox: | ||
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| + | <syntaxhighlight lang=pascal> | ||
var | var | ||
s: String; | s: String; | ||
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Declaration: | Declaration: | ||
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| + | <syntaxhighlight lang=pascal> | ||
var | var | ||
p: PChar; | p: PChar; | ||
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Valid assignments: | Valid assignments: | ||
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| + | <syntaxhighlight lang=pascal> | ||
p := 'This is a null-terminated string.'; | p := 'This is a null-terminated string.'; | ||
p := IntToStr(45); | p := IntToStr(45); | ||
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Invalid assignments: | Invalid assignments: | ||
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| + | <syntaxhighlight lang=pascal> | ||
p := 45; | p := 45; | ||
</syntaxhighlight> | </syntaxhighlight> | ||
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The integer value is not casted to a PChar as might be expected. | The integer value is not casted to a PChar as might be expected. | ||
== See also == | == See also == | ||
* [[Character and string types]] | * [[Character and string types]] | ||
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Revision as of 08:00, 23 February 2020
Back to data types.
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.
