DELPHI基础开发技巧

删掉程序自己的exe文件
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
var
  F:TextFile;
begin
  AssignFile(F,''''delself.bat'''');
  Rewrite(F);{F为TextFile类型}
  WriteLn(F,''''del ''''+ExtractFileName(Application.ExeName));
  WriteLn(F,''''del %0'''');   //删除自己delself.bat
  CloseFile(F);
  WinExec(''''delself.bat'''',SW_HIDE);
end;

if ord(s[9])>128 then
  ShowMessage(''''该位置字符是汉字'''');
汉字是双字节的
更改系统时间格式：

var
  str: string;
begin
  str := ''''yyyy-mm-dd'''';
  if SetLocaleInfoa(LOCALE_SYSTEM_DEFAULT, LOCALE_SLONGDATE, PChar(str)) then
  begin
    showmessage(''''更改日期格式成功'''');
  end;
end;

休息一分钟：
var
I:integer;
begin
  i:=gettickcount;
  while (Gettickcount-i)<=10000 do
    application.ProcessMessages;//保证消息循环
end;

取主文件名:
function retuFileName(const FileName: string): string;
var
  I: Integer;
begin
  I := LastDelimiter(''''.'''', FileName);
  Result := Copy(FileName, 1, i-1);

end;

(1).按下ctrl和其它键之后发生一事件。
    procedure TForm1.FormKeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
    begin
      if (ssCtrl in Shift) and (key =67) then
         showmessage(''''keydown Ctrl+C'''');
    end;
(2).Dbgrid中用Enter键代替Tab键.
   procedure TForm1.DBGrid1KeyPress(Sender: TObject; var Key: Char);
   begin
     if Key = #13 then
     if ActiveControl = DBGrid1 then
     begin
        TDBGrid(ActiveControl).SelectedIndex := TDBGrid(ActiveControl).SelectedIndex + 1;
        Key := #0;
     end;
   end;
(3).Dbgrid中选择多行发生一事件。
    procedure TForm1.Button1Click(Sender: TObject);
    var
    i:integer;
    bookmarklist:Tbookmarklist;
    bookmark:tbookmarkstr;
    begin
      bookmark:=adoquery1.Bookmark;
      bookmarklist:=dbgrid1.SelectedRows;
      try
      begin
        for i:=0 to bookmarklist.Count-1 do
        begin
          adoquery1.Bookmark:=bookmarklist[i];
          with adoquery1 do
          begin
            edit;
            fieldbyname(''''mdg'''').AsString:=edit2.Text;
            post;
          end;
        end;
      end;
      finally
      adoquery1.Bookmark:=bookmark;
      end;
    end;
(4).Form的一个出现效果。
    procedure TForm1.Button1Click(Sender: TObject);
    var
    r:thandle;
    i:integer;
    begin
      for i:=1 to trunc(width/1.414) do
      begin
        r:=CreateEllipticRgn(trunc(width/2)-i,trunc(height/2)-i,trunc(width/2)+i,trunc(height/2)+i);
        SetWindowRgn(handle,r,true);
        Application.ProcessMessages;
        sleep(1);
      end;
    end;
(5).用Enter代替Tab在编辑框中移动隹点。
    procedure TForm1.FormKeyPress(Sender: TObject; var Key: Char);
    begin
      if key=#13 then
        begin
          if not (Activecontrol is Tmemo) then
          begin
            key:=#0;
            keybd_event(vk_tab,mapvirtualkey(vk_tab,0),0,0);
          end;
        end;
    end;
(6).Progressbar加上色彩。
    const
    {$EXTERNALSYM PBS_MARQUEE}
    PBS_MARQUEE = 08;
    var
      Form1: TForm1;
    implementation
    {$R *.dfm}
    uses
    CommCtrl;
    procedure TForm1.Button1Click(Sender: TObject);
    begin
      // Set the Background color to teal
      Progressbar1.Brush.Color := clTeal;
      // Set bar color to yellow
      SendMessage(ProgressBar1.Handle, PBM_SETBARCOLOR, 0, clYellow);
    end;
(7).住点移动时编辑框色彩不同。
    procedure TForm1.Edit1Enter(Sender: TObject);
    begin
      (sender as tedit).Color:=clred;
    end;
    procedure TForm1.Edit1Exit(Sender: TObject);
    begin
      (sender as tedit).Color:=clwhite;
    end;
(8).备份和恢复
    procedure TForm1.Button1Click(Sender: TObject);
    begin
      if OpenDialog1.Execute then
      begin
        try
          adoconnection1.Connected:=False;
          adoconnection1.ConnectionString:=''''Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Initial Catalog=master;Data Source=FRIEND-YOFZKSCO;''''+
          ''''Use Procedure for Prepare=1;Auto Translate=True;Packet Size=4096;Workstation ID=FRIEND-YOFZKSCO;Use Encryption for Data=False;Tag with column collation when possible=False'''';
          adoconnection1.Connected:=True;
          with adoQuery1 do
          begin
            Close;
            SQL.Clear;
            SQL.Add(''''Backup DataBase sfa to disk =''''''''''''+opendialog1.FileName+'''''''''''''''');
            ExecSQL;
          end;
        except
          ShowMessage(''''±?·Y꧰ü'''');
        Exit;
        end;
      end;
      Application.MessageBox(''''1§?2?ú￡?êy?Y±?·Y3é1|'''',''''ìáê?'''',MB_OK + MB_ICONINFORMATION);
    end;
    procedure TForm1.Button2Click(Sender: TObject);
    begin
      if OpenDialog1.Execute then
      begin
        try
          adoconnection1.Connected:=false;
          adoconnection1.ConnectionString:=''''Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Initial Catalog=master;Data Source=FRIEND-YOFZKSCO;''''+
          ''''Use Procedure for Prepare=1;Auto Translate=True;Packet Size=4096;Workstation ID=FRIEND-YOFZKSCO;Use Encryption for Data=False;Tag with column collation when possible=False'''';
          adoconnection1.Connected:=true;
          with adoQuery1 do
          begin
            Close;
            SQL.Clear;
            SQL.Add(''''Restore DataBase sfa from disk =''''''''''''+opendialog1.FileName+'''''''''''''''');
            ExecSQL;
        

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