WinAPI 字符及字符串函数(14): CharToOem、OemToChar

CharToOemBuff、OemToCharBuff 与 CharToOem、OemToChar 的区别只是前者可以指定要转换的字符数.

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  Buf: PWideChar;
  AnsiBuf: array[0..255] of AnsiChar;
begin
  Buf := '万一的 Delphi 博客';
  CharToOem(Buf, AnsiBuf);
  ShowMessage(string(AnsiBuf)); {万一的 Delphi 博客}

  FillChar(AnsiBuf, Length(AnsiBuf), #0);

  CharToOemBuff(Buf, AnsiBuf, 6);
  ShowMessage(string(AnsiBuf)); {万一的 De}
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  str: string;
  p: PAnsiChar;
begin
  str := '万一的 Delphi 博客';

  p := GetMemory(256);
  CharToOem(PChar(str), p);
  ShowMessage(string(p)); {万一的 Delphi 博客}
  FreeMemory(p);

  p := GetMemory(256);
  CharToOemBuff(PChar(str), p, 6);
  ShowMessage(string(p)); {万一的 De}
  FreeMemory(p);
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  AnsiBuf: PAnsiChar;
  Buf: array[0..255] of Char;
begin
  AnsiBuf := '万一的 Delphi 博客';
  OemToChar(AnsiBuf, buf);
  ShowMessage(string(Buf)); {万一的 Delphi 博客}

  FillChar(Buf, Length(Buf), #0);

  OemToCharBuff(AnsiBuf, buf, 6);
  ShowMessage(string(Buf)); {万一的}
end;

procedure TForm1.Button4Click(Sender: TObject);
var
  AnsiStr: AnsiString;
  p: PChar;
begin
  AnsiStr := '万一的 Delphi 博客';

  p := StrAlloc(256);
  OemToChar(PAnsiChar(AnsiStr), p);
  ShowMessage(string(p)); {万一的 Delphi 博客}
  StrDispose(p);

  p := StrAlloc(256);
  OemToCharBuff(PAnsiChar(AnsiStr), p, 6);
  ShowMessage(string(p)); {万一的}
  StrDispose(p);
end;

end.