Delphi Programming

LeftStr Routine

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function LeftStr(const AText: AnsiString; const ACount: Integer): AnsiString; overload;
function LeftStr(const AText: WideString; const ACount: Integer): WideString; overload;

The LeftStr function takes 2 parameters. The first parameter is the source string and the second is an integer with number of characters from the beginning of the string.

The result is a substring taken from the beginning of the source string with the length in characters given in the second parameter.

Technical CommentsEdit

(Known issues / Documentation clarifications / Things to be aware of)


  SourceString, SubString: String;
  SubStringLength: Integer;
  SourceString := 'Delphi Wikia'; //string length is 12
  SubStringLength := 6;
  SubString := LeftStr(SourceString, SubStringLength);
  ShowMessage(SubString); //will show 'Delphi'

  SubStringLength := 20; //length is more then the source string
  SubString := RightStr(SourceString, SubStringLength);
  ShowMessage(SubString); //will show the complete SourceString 'Delphi Wikia'

  SubStringLength := -1;
  SubString := RightStr(SourceString, SubStringLength);
  ShowMessage(SubString); //If the SubStringLength is anything lower than 1 then then result will be empty

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