COM设计与实现范例

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原创最新推荐文章于 2026-05-06 21:20:18 发布 1k 阅读 AI 写同款· GEO 优化 ›

COM：链路设计师的实战指南在获取最近发布的PyChOpMargPython 包的初始版本1，我对COM 无法自拔，从规范到实际实践，旨在以某种具有任何工程意义的方式解决差异。这个过程让我饱受重创、瘀伤和炮弹冲击，成为 COM 战场上饱受战争蹂躏的士兵。我写这个“实地指南”，希望能帮助其他人避免我掉进的陷阱。首字母缩略词“COM”代表通道裕量分析。COM 背后的想法是提供一种方法，让通道以一定的比特率使用，也许还有调制和/或编码方案，而不需要成熟的串行链路模拟和所有假定的包袱。阅读详情

COM设计与实现范例

原创作者：小王志东，王健。

创作日期：2002年4月5日星期五

组件对象模型是一种跨平台技术，是现代面向对象分析与设计的技术实现手段之一，就现实系统应用来看，COM技术有着很强的实用价值。

OOA -> OOD -> OOP 用纯面向对象技术分析设计实现系统

现就给出一个简单的范例来展示其魅力。系统描述：本系统是一个多用户登录管理系统。要求用户通过输入用户编号和密码登录系统，如登录成功则显示成功消息，否则显示错误消息。系统分析：类的抽取，根据关键词抽取出用户类，根据用户类衍生出用户管理员类。

COM接口定义

unit UnionComs_TLB;

// ************************************************************************ //

// WARNING

// -------

// The types declared in this file were generated from data read from a

// Type Library. If this type library is explicitly or indirectly (via

// another type library referring to this type library) re-imported, or the

// 'Refresh' command of the Type Library Editor activated while editing the

// Type Library, the contents of this file will be regenerated and all

// manual modifications will be lost.

// ************************************************************************ //

// PASTLWTR : $Revision: 1.130 $

// File generated on 2002-4-5 11:34:29 from Type Library described below.

// ************************************************************************ //

// Type Lib: D:/stevenbob/exmines/UnionComGroup/Coms/UnionComs.tlb (1)

// LIBID: {A5265797-1AE4-4465-B5BA-67CB3E5F615E}

// LCID: 0

// Helpfile:

// DepndLst:

// (1) v2.0 stdole, (C:/WINNT/System32/stdole2.tlb)

// (2) v4.0 StdVCL, (C:/WINNT/System32/STDVCL40.DLL)

// ************************************************************************ //

{$TYPEDADDRESS OFF} // Unit must be compiled without type-checked pointers.

{$WARN SYMBOL_PLATFORM OFF}

{$WRITEABLECONST ON}

interface

uses ActiveX, Classes, Graphics, StdVCL, Variants, Windows;

// *********************************************************************//

// GUIDS declared in the TypeLibrary. Following prefixes are used:

// Type Libraries : LIBID_xxxx

// CoClasses : CLASS_xxxx

// DISPInterfaces : DIID_xxxx

// Non-DISP interfaces: IID_xxxx

// *********************************************************************//

const

// TypeLibrary Major and minor versions

UnionComsMajorVersion = 1;

UnionComsMinorVersion = 0;

LIBID_UnionComs: TGUID = '{A5265797-1AE4-4465-B5BA-67CB3E5F615E}';

IID_IUserGroup: TGUID = '{D168EB08-8C53-41F7-9B4C-B1EA0120C1DA}';

CLASS_UserGroup: TGUID = '{91648D17-4920-48A1-BC8E-94E6A70AA31B}';

IID_IUser: TGUID = '{8CC77A6A-0D6B-4646-8DD2-D3E3853C46B7}';

CLASS_User: TGUID = '{EA6025AF-6F8C-4201-8DF4-BE5DB86D061A}';

type

// *********************************************************************//

// Forward declaration of types defined in TypeLibrary

// *********************************************************************//

IUserGroup = interface;

IUser = interface;

IUserDisp = dispinterface;

// *********************************************************************//

// Declaration of CoClasses defined in Type Library

// (NOTE: Here we map each CoClass to its Default Interface)

// *********************************************************************//

UserGroup = IUserGroup;

User = IUser;

// *********************************************************************//

// Interface: IUserGroup

// Flags: (4096) Dispatchable

// GUID: {D168EB08-8C53-41F7-9B4C-B1EA0120C1DA}

// *********************************************************************//

IUserGroup = interface(IDispatch)

['{D168EB08-8C53-41F7-9B4C-B1EA0120C1DA}']

function CreateUser(ID: Integer; const UserName: WideString; const UserPwd: WideString;

out ppUser: User): HResult; stdcall;

function GetCount(out plCount: Integer): HResult; stdcall;

end;

// *********************************************************************//

// Interface: IUser

// Flags: (4416) Dual OleAutomation Dispatchable

// GUID: {8CC77A6A-0D6B-4646-8DD2-D3E3853C46B7}

// *********************************************************************//

IUser = interface(IDispatch)

['{8CC77A6A-0D6B-4646-8DD2-D3E3853C46B7}']

function Get_Name: WideString; safecall;

procedure Set_Name(const Value: WideString); safecall;

function Get_ID: Integer; safecall;

procedure Set_ID(Value: Integer); safecall;

function Get_Password: WideString; safecall;

function ChangePassword(const OldPwd: WideString; const NewPwd: WideString;

const CfmPwd: WideString): Integer; safecall;

property Name: WideString read Get_Name write Set_Name;

property ID: Integer read Get_ID write Set_ID;

property Password: WideString read Get_Password;

end;

// *********************************************************************//

// DispIntf: IUserDisp

// Flags: (4416) Dual OleAutomation Dispatchable

// GUID: {8CC77A6A-0D6B-4646-8DD2-D3E3853C46B7}

// *********************************************************************//

IUserDisp = dispinterface

['{8CC77A6A-0D6B-4646-8DD2-D3E3853C46B7}']

property Name: WideString dispid 2;

property ID: Integer dispid 3;

property Password: WideString readonly dispid 4;

function ChangePassword(const OldPwd: WideString; const NewPwd: WideString;

const CfmPwd: WideString): Integer; dispid 5;

end;

// *********************************************************************//

// The Class CoUserGroup provides a Create and CreateRemote method to

// create instances of the default interface IUserGroup exposed by

// the CoClass UserGroup. The functions are intended to be used by

// clients wishing to automate the CoClass objects exposed by the

// server of this typelibrary.

// *********************************************************************//

CoUserGroup = class

class function Create: IUserGroup;

class function CreateRemote(const MachineName: string): IUserGroup;

end;

// *********************************************************************//

// The Class CoUser provides a Create and CreateRemote method to

// create instances of the default interface IUser exposed by

// the CoClass User. The functions are intended to be used by

// clients wishing to automate the CoClass objects exposed by the

// server of this typelibrary.

// *********************************************************************//

CoUser = class

class function Create: IUser;

class function CreateRemote(const MachineName: string): IUser;

end;

implementation

uses ComObj;

class function CoUserGroup.Create: IUserGroup;

begin

Result := CreateComObject(CLASS_UserGroup) as IUserGroup;

end;

class function CoUserGroup.CreateRemote(const MachineName: string): IUserGroup;

begin

Result := CreateRemoteComObject(MachineName, CLASS_UserGroup) as IUserGroup;

end;

class function CoUser.Create: IUser;

begin

Result := CreateComObject(CLASS_User) as IUser;

end;

class function CoUser.CreateRemote(const MachineName: string): IUser;

begin

Result := CreateRemoteComObject(MachineName, CLASS_User) as IUser;

end;

end.

COM接口的实现

unit uUnionComsImpl;

{$WARN SYMBOL_PLATFORM OFF}

interface

uses

// ActiveX, Mtsobj, Mtx, ComObj, UnionComs_TLB, StdVcl;

Windows, ActiveX, Classes, ComObj, UnionComs_TLB, StdVcl;

type

TUserRec = record

Intf: IUser;

bUsed: Boolean;

end;

TUserGroup = class(TAutoObject, IUserGroup)

private

FUserArray: array of TUserRec;

protected

function CreateUser(ID: Integer; const UserName, UserPwd: WideString;

out ppUser: User): HResult; stdcall;

function GetCount(out plCount: Integer): HResult; stdcall;

public

destructor Destroy; override;

procedure Initialize; override;

end;

implementation

uses ComServ;

function TUserGroup.CreateUser(ID: Integer; const UserName,

UserPwd: WideString; out ppUser: User): HResult;

var

AIntf: IUser;

begin

SetLength(FUserArray, Length(FUserArray) + 1);

AIntf := CoUser.Create as IUser;

FUserArray[Length(FUserArray) - 1].Intf := AIntf;

FUserArray[Length(FUserArray) - 1].bUsed := True;

AIntf.Name := UserName;

AIntf.ID := ID;

ppUser := FUserArray[Length(FUserArray) - 1].Intf;

end;

destructor TUserGroup.Destroy;

var

i: Integer;

begin

for i := Low(FUserArray) to High(FUserArray) do

begin

FUserArray[i].Intf := nil;

FUserArray[i].bUsed := False;

end;

SetLength(FUserArray, 0);

inherited Destroy;

end;

function TUserGroup.GetCount(out plCount: Integer): HResult;

begin

plCount := Length(FUserArray);

end;

procedure TUserGroup.Initialize;

begin

inherited;

end;

initialization

TAutoObjectFactory.Create(ComServer, TUserGroup, Class_UserGroup,

ciMultiInstance, tmApartment);

end.

客户端程序的实现

Create User Button 的代码实现

procedure TForm1.Button1Click(Sender: TObject);

var

AUserGroup: IUserGroup;

AUser: IUser;

begin

AUser := nil;

AUserGroup := CoUserGroup.Create;

AUserGroup.CreateUser(10, 'WZD', '912', AUser);

ShowMessage(AUser.Name);

Auser.ChangePassword('', '912', '912');

ShowMessage(AUser.Password);

end;

实例下载: http://www.megspace.com/computers/coreware/

收录于

COM+/MTS

标签

#integer #function #interface #class #library

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COM设计与实现范例

COM设计与实现范例

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