Title: Changing folder in Open/Save dialogs
Question: It is possible to specify initial folder in Open/Save dialogs. However sometimes it is necessary to change current folder, for example, in responce to change of filter.
Answer:
Windows doesn't offer a way to change current dialog. However there is a very handy approach to this problem - imitate user actions. Below is the sample code of how the folder is changed when filter is changed.
procedure SaveDialogTypeChange is a handler for OnTypeChange event.
Depending on the type different folders are selected. This piece of code saves the value of file name edit box, puts a new folder name there, then imitates click of OK button and then restores contents of the edit box.
procedure TMainForm.SaveDialogTypeChange(Sender: TObject);
var S, S1 : string;
EditHandle : THandle;
startp,
endp : DWORD;
begin
s := '';
if SaveDialog.FilterIndex = 2 then
begin
s := 'c:\program files';
end
else
if SaveDialog.FilterIndex = 3 then
begin
s := 'd:\program files';
end;
if s '' then
begin
EditHandle := GetDlgItem(GetParent(SaveDialog.Handle), edt1);
if EditHandle 0 then
begin
SetLength(S1, GetWindowTextLength(EditHandle) + 1);
GetWindowText(EditHandle, PChar(S1), Length(S1));
SetLength(S1, StrLen(PChar(S1)));
SendMessage(EditHandle, EM_GETSEL, Integer(@StartP), Integer(@EndP));
SetWindowText(EditHandle, PChar(S));
SendMessage(GetParent(SaveDialog.Handle), WM_COMMAND, 1, GetDlgItem(GetParent(SaveDialog.Handle), IDOK));
if Length(S1) 0 then
if S1[Length(S1)] = #10 then
Delete(S1, Length(S1), 1);
SetWindowText(EditHandle, PChar(S1));
SendMessage(EditHandle, EM_SETSEL, StartP, EndP);
end;
end;
end;