COM , OLE concept

transcript

COM , OLE concept

By topgun

src = Write Ole Control

x86 instruction set

Java virtual machine

Java app

Sparc instruction set

Java virtual machine

Java app

Java machine Java machine

x86 instruction set

OLE(activex)

binary standard

我猜的

COM object

x86 instruction set

binary standard

OLE(control) OLE(automation) script

binary standard

我猜的

Object 長相

我覺得

Java applet

Browser

Activex control

Active x Container

Activex relationship

Activex control

(container)

Activex automation(Server) (Client)

Active X technology

OLE(Active x) Automation (Server) OLE(Active x) Document OLE(Active x) Control …….

Client-Server Model

Server 一定是一個 COM object

Client 不一定要是 Com object

OLE architecture

Local and In-process Server (1)

Local Server

In-process Server

Local and In-process Server (2)

Local ServerLocal Server live in EXE file. Client and local sever live in different process space. The OLE library take care of passing back and forth

between them.

In-process ServerIn-process Server live in DLL file. The host process loads the DLL that contains the COM Server . This means that the in-process server lives

in the same process space as its host .

Local Server

In-process Server

Marshaling

Transport Data across a process boundary( function parameters and return Value )

Local Server

In-process Server

Proxies and stub

Local Server

Standard and Custom Marshaling

OLE Library accomplish standard marshaling use

Built-in proxies and stubs

OLE Library accomplish Custom marshaling use

custom proxies and custom stubs

CLSID -- a COM server’s GUID is called its class ID(SERVER)

IID -- is a GUID that distinguishes one particular interface from all others(COM)

DISPID -- Dispath ID are numeric identifers that the OLE library use to identify your OLE Control’s property and methods(Control).

Interface (keypad of ATM)

提供輸入的服務以 regular 和 predictable 方式提供服務 --

例如都是夫入數字與命令是不變的 -- 如果被廣泛使用就不可以改變是可以預測的 -- 按下 enter button 是最後

一個指令在波士頓即在三番市，這件事都是對的 .

Interface concept

Interface are Specifications Only

COM Interface define a protocol but ----- in no way implement that protocol

Class Icalculate{public :virtual double sum (double, double)=0;virtual double product (double, double)=0;};

COM SERVER 來實現 “ REUSE“ 的機制

Containment

Delegation ( 委派 )

Aggregation ( 集合體 )

OLE Dcument

ActiveX Document is COM software components that present data and information to the user.

ActiveX Document allow user to view data in a variety of

ways,perhaps as a graph, a spreadsheet, or text

Structured Storage

COMServer

stream

Stream

Compound Document

Support fellow feature

Nested object supportobject conversion

optimized object storageobject linking and embedding

Naming ,Binding and Monikers

Com object store the name and location of other object

Binding

Container

OLE Automation

Automation ServerExpose its method (functionality) and properties ( characteristics )to other objects and application

IDispath

OLE control

OLE control s have three sets of attributes that are expose to the outside world

Property Methods Event

Container

Request

Property(member variable in c)

properties are named attributes or characteristics of an OLE control ------------

Some example of properties are color ,font,number.

Property page

OLE control provide access to their properties though property page(sheet)

(Clock object,might have a property called DisplayType,which indicate digital or analog)

Property can be changed programmatically or though a UI mechanism call property page

是一種由 OLE 控制元件所定義的一種使用者介面，允許使用者直接處理控制元件的 property ，不需要

container 的任何介入

Method (member function in c)

Method are function that client use to direct the actions of OLE servers.

Method are only accessible via OLE automation(IDispath)

OLE Automation properties,method (argument) and (return types)------------------------------------------------------------------

(argument and return )data type1. VARIANT

2.SAFEARRAY3. BSTR

Vt VARENUM VARIANT 中的資造型態iVal short 短整數IVal long 常整數…………… 還很多

OLE object raises an event when something interesting happens

OLE control

Mouse event

container

Control and Automation

OLE Control implement IDispatch to implement OLE Automation

Registry

<vendor>.<Server name>.<version name>“word.Document.6”

Point to the control’s Type LibraryType Library contains the descriptions of object class,interface,dispatch interface

( OLE automation) and type define

Conclusion

automation

Automation &automation

control

Control :ocxautomation :exe and DLL

COM , OLE concept

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