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插件管理框架 for Delphi(三)

王朝delphi·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

1 前言

2 插件框架(untDllManager)

3 使用举例

3.1 类图

3.2 客户端组件

从TDll派生出TClientDll;

根据真实的动态库接口添加相关属性;

3.2.1 组件定义

unit untClientDll;

interface

uses

Windows, Classes, SysUtils, untDllManager, untProcDefine;

type

EClientDllError = Class(Exception);

{ TClientDll

o 继承自 TDll;

o 自动获取 ClientInitialize 地址并保存在 ClientInitialize 属性中;

o 自动获取 ClientInsertTrigger 地址并保存在 ClientInsertTrigger 属性中;

}

TClientDll = Class(TDll)

private

FClientInitialize: TClientInitialize;

FClientInsertTrigger: TClientInsertTrigger;

FClientGetDescription: TClientGetDescription;

FClientSetup: TClientSetup;

FDescription: String;

FUseTrigger: Bool;

protected

procedure DoDllLoaded; override;

procedure DoDllUnLoaded; override;

public

constructor Create; override;

property ClientGetDescription: TClientGetDescription read FClientGetDescription;

property ClientInitialize: TClientInitialize read FClientInitialize;

property ClientInsertTrigger: TClientInsertTrigger read FClientInsertTrigger;

property ClientSetup: TClientSetup read FClientSetup;

property Description: String read FDescription write FDescription;

property UseTrigger: Bool read FUseTrigger write FUseTrigger;

end;

implementation

{ TClientDll }

constructor TClientDll.Create;

begin

inherited;

FClientInitialize := nil;

FClientInsertTrigger := nil;

FClientGetDescription := nil;

FClientSetup := nil;

end;

procedure TClientDll.DoDllLoaded;

begin

FClientInitialize := GetProcAddress(csClientInitialize);

if not Assigned(FClientInitialize) then

raise EClientDllError.Create('No found of Proc "ClientInitialize".');

FClientInsertTrigger := GetProcAddress(csClientInsertTrigger);

if not Assigned(FClientInsertTrigger) then

raise EClientDllError.Create('No found of Proc "ClientInsertTrigger".');

//可选接口,即使不存在也不报错。

FClientGetDescription := GetProcAddress(csClientGetDescription);

FClientSetup := GetProcAddress(csClientSetup);

inherited;

end;

procedure TClientDll.DoDllUnLoaded;

begin

inherited;

FClientInitialize := nil;

FClientInsertTrigger := nil;

FClientGetDescription := nil;

FClientSetup := nil;

end;

end.

3.2.2 组件使用

procedure TXXXXServer.LoadClientDll(const FileName: String);

//功能:加载一个ClientDll,并将相关数据传递进去

var

Index: Integer;

Description: String;

UseTrigger: Bool;

AClientDll: TClientDll;

begin

Index := FClientDlls.Add(FileName);

if Index < 0 then

raise EXXXXError.CreateFmt('ClientDll "%s" 之前已经装载.', [FileName]);

//尝试读取地址

try

FClientDlls[Index].Loaded := True;

finally

if not FClientDlls[Index].Loaded then

FClientDlls[Index].Free;

end;

//初始化该Client,同时将相关信息传入

UseTrigger := False;

AClientDll := TClientDll(FClientDlls[Index]);

if Assigned(AClientDll.ClientSetup) then

AClientDll.ClientSetup(mscAppPath + 'Client\', False);

end;

3.3 服务端组件

3.3.1 组件定义

unit untServerDll;

interface

uses

Windows, Classes, SysUtils, untDllManager, untProcDefine;

type

EServerDllError = Class(Exception);

{ TServerDll

o 继承自 TDll;

o 自动获取 QueryInterface 地址并保存在QueryInterface属性中;

}

TServerDll = Class(TDll)

private

FFunctions: TObject;

FQueryInterface: TProcQueryInterface;

protected

procedure DoDllLoaded; override;

procedure DoDllUnLoaded; override;

public

procedure RefreshAllFunctionsPermit;

property Functions: TObject read FFunctions write FFunctions;

property QueryInterface: TProcQueryInterface read FQueryInterface;

end;

implementation

uses

untFunctionProc;

{ TServerDll }

procedure TServerDll.DoDllLoaded;

begin

FQueryInterface := GetProcAddress(csQueryInterface);

if not Assigned(FQueryInterface) then

raise EServerDllError.Create('No found of "QueryInterface" Proc.');

inherited; //此句需要放在后面

end;

procedure TServerDll.DoDllUnLoaded;

begin

inherited;

FQueryInterface := nil;

end;

procedure TServerDll.RefreshAllFunctionsPermit;

var

I: Integer;

begin

Assert(FFunctions <> nil);

for I := 0 to TFunctionList(FFunctions).Count - 1 do

if TFunction(TFunctionList(FFunctions)[I]).Dll = Self then

TFunction(TFunctionList(FFunctions)[I]).Permit := Permit;

end;

end.

3.3.2 组件使用

略。

[文终]

 
 
 
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