Mega Code Archive
Use an alternative for topendialog-tsavedialog
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{
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;
implementation
uses ShlObj, SysUtils;
type
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;
end;
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';
const
OFN_DONTADDTORECENT = $02000000;
OFN_FILEMUSTEXIST = $00001000;
OFN_HIDEREADONLY = $00000004;
OFN_PATHMUSTEXIST = $00000800;
function CharReplace(const Source: string; oldChar, newChar: Char): string;
var
i: Integer;
begin
Result := Source;
for i := 1 to Length(Result) do
if Result[i] = oldChar then
Result[i] := newChar
end;
function OpenSaveFileDialog(ParentHandle: THandle; const DefExt, Filter, InitialDir, Title: string; var FileName: string; IsOpenDialog: Boolean): Boolean;
var
ofn: TOpenFileName;
szFile: array[0..MAX_PATH] of Char;
begin
Result := False;
FillChar(ofn, SizeOf(TOpenFileName), 0);
with ofn do
begin
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);
end;
if IsOpenDialog then
begin
if GetOpenFileName(ofn) then
begin
Result := True;
FileName := StrPas(szFile);
end;
end
else
begin
if GetSaveFileName(ofn) then
begin
Result := True;
FileName := StrPas(szFile);
end;
end
end;
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