SysUtils 中其他 PChar 函数: StrPas、StrNew、StrDispose、StrNextChar、StrFmt、StrLFmt、StrCharLength

//StrPas: 转换 PChar 为 string; 现在可以直接赋值, 很少用了.
var
  p: PChar;
  s: string;
begin
  p := 'Delphi';
  s := StrPas(p);
  ShowMessage(s); {Delphi}
end;


//StrNew、StrDispose: 建立与销毁 PChar.
var
  p: PChar;
begin
  p := StrNew('Delphi');
  ShowMessage(p); {Delphi}
  StrDispose(p);
end;


//StrFmt、StrLFmt: 针对 PChar 的格式化函数
var
  buf: array[0..255] of Char;
  p: PChar;
begin
  p := StrFmt(buf, '%d, %d', [123, MaxInt]);
  ShowMessage(buf); {123, 2147483647}
  ShowMessage(p);   {123, 2147483647}

  p := StrLFmt(buf, 9, '%d, %d', [123, MaxInt]);
  ShowMessage(buf); {123, 2147}
  ShowMessage(p);   {123, 2147}
end;


//StrNextChar; 因为 PChar 支持加减运算, 这个函数很少用
var
  p: PChar;
begin
  p := '12345';
  p := StrNextChar(p);
  ShowMessage(p);      {2345}
end;


//StrCharLength: 一个 Char 的长度
var
  p: PChar;
  i: Integer;
begin
  p := 'Delphi';
  i := StrCharLength(p);
  ShowMessage(IntToStr(i)); {1}
end;

SysUtils 单元下的公用函数目录

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