pkgmain.pas

《Delphi开发人员指南》配书原码

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.