picku.pas

《Delphi开发人员指南》配书原码

unit PickU;

interface

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

type
  TLinkForm = class(TForm)
    lbLinkFiles: TFileListBox;
    btnOk: TButton;
    btnCancel: TButton;
    cbLocation: TComboBox;
    Label1: TLabel;
    procedure lbLinkFilesDblClick(Sender: TObject);
    procedure cbLocationChange(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  end;

function GetLinkFile(var S: String): Boolean;

implementation

{$R *.DFM}

uses WinShell, ShlObj;

function GetLinkFile(var S: String): Boolean;
{ Returns link file name in S. }
{ Only modifies S when Result is True. }
begin
  with TLinkForm.Create(Application) do
    try
      { Make sure location is selected }
      cbLocation.ItemIndex := 0;
      { Get path of selected location }
      cbLocationChange(nil);
      Result := ShowModal = mrOk;
      { Return full pathname for link file }
      if Result then
        S := lbLinkFiles.Directory + '\' + lbLinkFiles.Items[lbLinkFiles.ItemIndex];
    finally
      Free;
    end;
end;

procedure TLinkForm.lbLinkFilesDblClick(Sender: TObject);
begin
  ModalResult := mrOk;
end;

procedure TLinkForm.cbLocationChange(Sender: TObject);
var
  Folder: Integer;
begin
  { Get path of selected location }
  Folder := SpecialFolders[cbLocation.ItemIndex].ID;
  lbLinkFiles.Directory := GetSpecialFolderPath(Folder, False);
end;

procedure TLinkForm.FormCreate(Sender: TObject);
var
  I: Integer;
begin
  for I := Low(SpecialFolders) to High(SpecialFolders) do
    cbLocation.Items.Add(SpecialFolders[I].Name);
end;

end.