program PkgInfo;

uses
 Forms,
 Dialogs,
 SysUtils,
 PkgMain in 'PkgMain.pas' {PackInfoForm};

{$R *.RES}

var
 OpenDialog: TOpenDialog;
begin
 if (ParamCount > 0) and FileExists(ParamStr(1)) then
 PkgName := ParamStr(1)
 else
 begin
 OpenDialog := TOpenDialog.Create(Application);
 OpenDialog.DefaultExt := '*.bpl';
 OpenDialog.Filter := 'Packages (*.bpl)|*.bpl|Delphi 3 Packages ' +
 '(*.dpl)|*.dpl';
 if OpenDialog.Execute then
 PkgName := OpenDialog.FileName;
 end;
 if PkgName <> '' then
 begin
 Application.Initialize;
 Application.CreateForm(TPackInfoForm, PackInfoForm);
 Application.Run;
 end;
end.

unit PkgMain;

interface

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

type
 TPackInfoForm = class(TForm)
 GroupBox1: TGroupBox;
 DsgnPkg: TCheckBox;
 RunPkg: TCheckBox;
 BuildCtl: TRadioGroup;
 GroupBox2: TGroupBox;
 GroupBox3: TGroupBox;
 Button1: TButton;
 Label1: TLabel;
 DescEd: TEdit;
 memContains: TMemo;
 memRequires: TMemo;
 procedure FormCreate(Sender: TObject);
 procedure Button1Click(Sender: TObject);
 end;

var
 PackInfoForm: TPackInfoForm;
 PkgName: string; // This is assigned in project file

implementation

{$R *.DFM}

procedure PackageInfoCallback(const Name: string; NameType: TNameType;
 Flags: Byte; Param: Pointer);
var
 AddName: string;
 Memo: TMemo;
begin
 Assert(Param <> nil);
 AddName := Name;
 case NameType of
 ntContainsUnit: Memo := TPackInfoForm(Param).memContains;
 ntRequiresPackage: Memo := TPackInfoForm(Param).memRequires;
 else
 Memo := nil;
 end;
 if (Memo <> nil) then
 begin
 if Memo.Text <> '' then
 AddName := ', ' + AddName;
 Memo.Text := Memo.Text + AddName;
 end;
end;

procedure TPackInfoForm.FormCreate(Sender: TObject);
var
 PackMod: HMODULE;
 Flags: Integer;
begin
 // Since we only need to get into the package's resources,
 // LoadLibraryEx with LOAD_LIBRARY_AS_DATAFILE provides a speed-
 // efficient means for loading the package.
 PackMod := LoadLibraryEx(PChar(PkgName), 0, LOAD_LIBRARY_AS_DATAFILE);
 if PackMod = 0 then
 Exit;
 try
 GetPackageInfo(PackMod, Pointer(Self), Flags, PackageInfoCallback);
 finally
 FreeLibrary(PackMod);
 end;
 Caption := 'Package Info: ' + ExtractFileName(PkgName);
 DsgnPkg.Checked := Flags and pfDesignOnly <> 0;
 RunPkg.Checked := Flags and pfRunOnly <> 0;
 if Flags and pfNeverBuild <> 0 then
 BuildCtl.ItemIndex := 1;
 DescEd.Text := GetPackageDescription(PChar(PkgName));
end;

procedure TPackInfoForm.Button1Click(Sender: TObject);
begin
 Close;
end;

end.