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Альтернатива для TOpenDialog и TSaveDialog

Оформил: DeeCo

  Today I want to display how you may use the simple functions as 
  alternative for TOpenDialog/TSaveDialog components. 

  Problem is that Borland incorrectly wrote those components and when 
  Microsoft add some new extended features in own dialogs, 
  standard TOpenDialog and TSaveDialog still use old style. 
  For example, when Microsoft added placebar in own dialogs, 
  VCL's dialog still use old style without placebars. 

  Personally I prefer to use applications that support all 
  features of installed OS. 

  This is a reason why I wrote the function as wrapper for Windows 
  API call for dialogs and now I use this function instead components. 
  It allow not only to use all new features from Windows, 
  but also reduce a size for exe-file and allow to use same function for 
  both TOpenDialog and TSaveDialog functionality. 

  For example: 
  1. to display the "OpenDialog" for text files 
    s := 'aaa.txt'; 
    if OpenSaveFileDialog(Application.Handle, 'txt', 'Text Files|*.txt', 'c:\', 
    'Select text file', s, True) then 
      ShowMessage(s + ' file was selected for open') 

  2. to display the "Save dialog": 
    s := 'data.dbf'; 
    if OpenSaveFileDialog(Application.Handle, 'dbf', 'dBase tables|*.dbf|All files|*.*', 
    'c:\', 'Select table', s, False) then 
      ShowMessage(s + ' table was selected for save') 

  See full code below. Hope you'll find this code useful. 

 uses Windows;

 function OpenSaveFileDialog(ParentHandle: THandle; const DefExt, Filter, InitialDir,
   Title: string; var FileName: string; IsOpenDialog: Boolean): Boolean;

 uses ShlObj, SysUtils;

   POpenFilenameA = ^TOpenFilenameA;
   POpenFilename = POpenFilenameA;
   tagOFNA = packed record
     lStructSize: DWORD;
     hWndOwner: HWND;
     hInstance: HINST;
     lpstrFilter: PAnsiChar;
     lpstrCustomFilter: PAnsiChar;
     nMaxCustFilter: DWORD;
     nFilterIndex: DWORD;
     lpstrFile: PAnsiChar;
     nMaxFile: DWORD;
     lpstrFileTitle: PAnsiChar;
     nMaxFileTitle: DWORD;
     lpstrInitialDir: PAnsiChar;
     lpstrTitle: PAnsiChar;
     Flags: DWORD;
     nFileOffset: Word;
     nFileExtension: Word;
     lpstrDefExt: PAnsiChar;
     lCustData: LPARAM;
     lpfnHook: function(Wnd: HWND; Msg: UINT; wParam: WPARAM; lParam: LPARAM): UINT stdcall;
     lpTemplateName: PAnsiChar;
   TOpenFilenameA = tagOFNA;
   TOpenFilename = TOpenFilenameA;

 function GetOpenFileName(var OpenFile: TOpenFilename): Bool; stdcall; external 'comdlg32.dll'  name 'GetOpenFileNameA';
 function GetSaveFileName(var OpenFile: TOpenFilename): Bool; stdcall; external 'comdlg32.dll'  name 'GetSaveFileNameA';

   OFN_FILEMUSTEXIST = $00001000;
   OFN_HIDEREADONLY = $00000004;
   OFN_PATHMUSTEXIST = $00000800;

 function CharReplace(const Source: string; oldChar, newChar: Char): string;
   i: Integer;
   Result := Source;
   for i := 1 to Length(Result) do
     if Result[i] = oldChar then
       Result[i] := newChar

 function OpenSaveFileDialog(ParentHandle: THandle; const DefExt, Filter, InitialDir, Title: string; var FileName: string; IsOpenDialog: Boolean): Boolean;
   ofn: TOpenFileName;
   szFile: array[0..MAX_PATH] of Char;
   Result := False;
   FillChar(ofn, SizeOf(TOpenFileName), 0);
   with ofn do
     lStructSize := SizeOf(TOpenFileName);
     hwndOwner := ParentHandle;
     lpstrFile := szFile;
     nMaxFile := SizeOf(szFile);
     if (Title <> '') then
       lpstrTitle := PChar(Title);
     if (InitialDir <> '') then
       lpstrInitialDir := PChar(InitialDir);
     StrPCopy(lpstrFile, FileName);
     lpstrFilter := PChar(CharReplace(Filter, '|', #0)+#0#0);
   if DefExt <> '' then
       lpstrDefExt := PChar(DefExt);
   if IsOpenDialog then
     if GetOpenFileName(ofn) then
       Result := True;
       FileName := StrPas(szFile);
     if GetSaveFileName(ofn) then
       Result := True;
       FileName := StrPas(szFile);
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