1 前言
2 插件框架（untDllManager）
2.2 实现代码
unit untDllManager;
interface
uses
Windows, Classes, SysUtils, Forms;
type
EDllError = Class(Exception);
TDllClass = Class of TDll;
TDll = Class;
TDllEvent = procedure(Sender: TObject; ADll: TDll) of Object;
{ TDllManager
o 提供对 Dll 的管理功能；
o Add 时自动创建 TDll 对象，但不尝试装载；
o Delete 时自动销毁 TDll 对象；
}
TDllManager = Class(TList)
private
FLock: TRTLCriticalSection;
FDllClass: TDllClass;
FOnDllLoad: TDllEvent;
FOnDllBeforeUnLoaded: TDllEvent;
function GetDlls(const Index: Integer): TDll;
function GetDllsByName(const FileName: String): TDll;
protected
procedure Notify(Ptr: Pointer; Action: TListNotification); override;
public
constructor Create;
destructor Destroy; override;
function Add(const FileName: String): Integer; overload;
function IndexOf(const FileName: String): Integer; overload;
function Remove(const FileName: String): Integer; overload;
procedure Lock;
procedure UnLock;
property DllClass: TDllClass read FDllClass write FDllClass;
property Dlls[const Index: Integer]: TDll read GetDlls; default;
property DllsByName[const FileName: String]: TDll read GetDllsByName;
property OnDllLoaded: TDllEvent read FOnDllLoad write FOnDllLoad;
property OnDllBeforeUnLoaded: TDllEvent read FOnDllBeforeUnLoaded write FOnDllBeforeUnLoaded;
end;
{ TDll
o 代表一个 Dll, Windows.HModule
o 销毁时自动在 Owner 中删除自身；
o 子类可通过覆盖override DoDllLoaded, 以及DoDllUnLoaded进行功能扩展;
}
TDll = Class(TObject)
private
FOwner: TDllManager;
FModule: HMODULE;
FFileName: String;
FPermit: Boolean;
procedure SetFileName(const Value: String);
function GetLoaded: Boolean;
procedure SetLoaded(const Value: Boolean);
procedure SetPermit(const Value: Boolean);
protected
procedure DoDllLoaded; virtual;
procedure DoBeforeDllUnLoaded; virtual;
procedure DoDllUnLoaded; virtual;
procedure DoFileNameChange; virtual;
procedure DoPermitChange; virtual;
public
constructor Create; virtual;
destructor Destroy; override;
function GetProcAddress(const Order: Longint): FARPROC; overload;
function GetProcAddress(const ProcName: String): FARPROC; overload;
property FileName: String read FFileName write SetFileName;
property Loaded: Boolean read GetLoaded write SetLoaded;
property Owner: TDllManager read FOwner;
property Permit: Boolean read FPermit write SetPermit;
end;
implementation
{ TDll }
constructor TDll.Create;
begin
FOwner := nil;
FFileName := '''''''';
FModule := 0;
FPermit := True;
end;
destructor TDll.Destroy;
var
Manager: TDllManager;
begin
Loaded := False;
if FOwner <> nil then
begin
//在拥有者中删除自身
Manager := FOwner;
//未防止在 TDllManager中重复删除，因此需要将
//FOwner设置为 nil; <-- 此段代码和 TDllManager.Notify 需要配合
//才能确保正确。
FOwner := nil;
Manager.Remove(Self);
end;
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