Citrix WEB SDK 开发指南：基于ICA Client Object API

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"citix(思杰) WEB SDK" 基于思杰Citrix的WEB SDK是一个关键的技术工具，它为开发者提供了在Web和客户端（CS）环境中构建与Citrix云桌面平台集成的应用程序的能力。这个SDK（Software Development Kit）文档详细阐述了如何利用Citrix ICA（独立计算架构）客户端对象API来设计和实现这些应用程序。 Citrix ICA Client Object API Specification Programmer's Guide是针对Citrix Presentation Server Clients 10.x for Windows以及Citrix Presentation Server 4.5的开发者指南。此文档涵盖的内容旨在帮助开发者理解和使用API，以便创建与Citrix底层技术兼容的解决方案。ICA（独立计算架构）是Citrix的核心技术，它负责处理远程桌面会话的传输和优化，确保用户能够高效、安全地访问远程应用和桌面。文档中的内容可能包括但不限于以下关键知识点： 1. **API接口详解**：详细介绍了各种客户端对象，如会话管理、资源发布、安全性设置等的API接口，这些接口允许开发者在Web应用中调用和控制Citrix云桌面环境。 2. **编程指南**：提供了如何在不同编程语言中使用这些API的示例代码，帮助开发者快速上手并理解如何进行实际开发。 3. **许可协议**：用户必须接受End User License Agreement（EULA）才能使用该SDK。EULA的副本可在文档的附录1中找到，这是使用SDK的前提条件。 4. **版本更新和变动**：由于技术的不断发展，文档中的信息可能会随时更新，开发者需要定期检查以获取最新信息。 5. **安全性和加密**：Citrix系统可能使用如RSA Encryption等技术来保障数据传输的安全性，开发者需要了解如何在应用中集成这些安全特性。 6. **商标和知识产权**：文档中提到了Citrix的多个注册商标，如ICA、MetaFrame、Program Neighborhood等，开发者在使用SDK时需遵守相关的商标使用规则。 7. **示例和最佳实践**：文档可能包含虚构或真实的案例，用于演示API的正确使用方式，帮助开发者理解最佳的编程实践。通过深入学习和应用Citrix WEB SDK，开发者可以构建出高效、稳定且与Citrix云桌面平台无缝集成的定制化应用，满足企业或组织的特定需求，提高远程工作和协作的效率。

16 Citrix ICA Client Object API Specification Programmer’s Guide

What Is ICA?

ICA is the foundation of Citrix server-based computing with Citrix Presentation

Server Client software. The ICA protocol sends screen data from a computer

running Presentation Server to the client users and returns the users’ input to the

application on the server.

When a user types on the keyboard or moves and clicks the mouse, the client

sends this data to the application on the server. The Citrix ICA protocol provides

advanced capabilities and enhanced performance with Windows Terminal

Services. ICA delivers high performance on high- and low-bandwidth

connections. It requires minimal client workstation capabilities and includes error

detection and recovery, encryption, and data compression.

What Are Citrix Presentation Server Clients?

The Citrix Presentation Server Clients (formerly known as the ICA clients) are

the software components of Presentation Server that execute on the client device.

The clients allow the user to establish an ICA session with a computer running

Presentation Server. With this session the user can access server-based

applications that appear to run locally on the client device but actually execute on

the server.

Client software extends the reach of Windows and UNIX-based applications to

virtually any client platform or device. These include information appliances,

handheld computers, network computers, X-devices, Windows-based terminals,

and PCs (Pentium, 486, and 386). Clients are available for all types of Windows

operating systems including Windows CE (Windows-based terminals and

Handheld PCs), Windows NT Workstation, Windows 95/98, Windows Me,

Windows 2000 Professional, Windows XP, Windows 2003, Windows Vista,

Windows for Workgroups, and Windows 3.x.

Web Clients (ActiveX control and Firefox Plug-in) allow Citrix administrators to

deploy applications through their intranets and ASP customers to deploy

applications through public networks, such as the Internet.

What is the ICA Client Object?

The ICA Client Object specification provides an Application Programming

Interface (API) for Presentation Server Clients for Windows. Use this API to

control the appearance and behavior of Presentation Server Clients. You can

embed the ICA Client Object in custom software applications to enable users to

launch ICA sessions with a click of a button, while shielding them from the

mechanics of accessing a server farm.

Chapter 2 Introduction to the ICA Client Object 19

Embedding and Scripting Interfaces

The ICA Client Object provides a set of standard scripting interfaces or APIs that

allow you to interface with the client software and control it from third-party

applications.

When an object is embedded in a container, you can control it with scripts. You

can use scripting tools such as JavaScript and VBScript to control the object

through the scripting interfaces. For example, in Word and Excel, you use

VBScript; for Internet Explorer, you use VBScript and JavaScript; while for the

Firefox browser, you use JavaScript.

ActiveX controls and Firefox plug-ins are two of the enabling technologies that

allow you to embed objects within container applications such as Internet

Explorer, Firefox, Microsoft Word, and Excel. The ICA Client Object

implementation is based on these two embedding technologies.

ActiveX

ActiveX is based on the Component Object Model (COM) architecture. ActiveX

controls are supported by the Internet Explorer Web browser environment and by

any container application conforming to the COM interface.

Embedding

ActiveX controls can be embedded in a Web browser (Internet Explorer) through

the OBJECT tag. For other types of container applications, ActiveX controls are

embedded through the standard COM interface.

In a Web browser environment (Internet Explorer), an ActiveX control is

embedded in a Web page as follows:

1. The ActiveX control must be installed and registered with the operating system.

If the control is not already installed, use the OBJECT tag to specify a URL

from which the ActiveX control can be downloaded and installed automatically.

2. When the ActiveX control is installed and registered, the Web browser creates

an instance of the object (the client).

3. The ActiveX control receives the download data from the browser (the ICA file)

and then starts the connection to the server. In addition to the downloaded ICA

file, parameters can be specified through PARAM tags.

20 Citrix ICA Client Object API Specification Programmer’s Guide

Properties

The ActiveX embedding model permits access to the public properties of an

object. In a Web browser environment, properties of an object can be set through

PARAM tags at load time, and can be read through the scripting interface. For

other types of container applications, properties are accessible through the COM

interface.

In addition to the PARAM tag interface, the ICA Client Object provides the

property interface that permits the Web browser to enumerate and access

properties through scripting. These methods are in the general form of

GetPropCount(), SetProp(propertyName, value),

GetPropValue(propertyName, value), and so on. Other types of

container applications can access these interfaces through the COM interface. See

“Property Interface” on page 50 for a complete list of property interfaces

available for the ICA Client Object.

Methods

The ActiveX embedding model permits access to public methods of an object.

For a Web browser, the object methods are accessed through supported scripting

languages. For other types of container applications, the object methods are

accessed through the traditional COM interface.

The ActiveX implementation of the ICA Client Object publishes a set of

methods. These methods are in the general form of DoAction(optionalParam).

See “Methods Interface” on page 59 for a list of published methods.

Events

The ActiveX embedding model provides a standard interface through which

events are dispatched to the container. In this interface model, the ActiveX

control (the source of the events) defines a set of supported events, while the

container defines a handler for each of the events in which it is interested. Event

handlers are referred to as event sinks.

The ActiveX implementation of the ICA Client Object supports this events

notification interface. The container provides the necessary event sink interface

for each of the events it wants to receive. See “Events Interface” on page 164 for

a list of available events.

Summary

The ActiveX implementation of the ICA Client Object supports embedding and

scripting on any platform where COM architecture is implemented.

Embedding of the ActiveX control is not limited to Internet Explorer; embedding

is supported by any application conforming to the COM interface.

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