HP官方LoadRunner协议SDK开发与使用指南

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本文档详细介绍了HP Performance Validation SDK，这是一个官方提供的软件测试工具，专为Windows操作系统设计，用于LoadRunner的压力测试和协议配置的二次开发。该版本为1.10，包含了开发者指南，发布日期为2010年8月，软件实际发行时间可能与此相近。 SDK的主要功能包括但不限于： 1. **协议支持**：作为LoadRunner的一部分，它提供了对各种网络协议的深入理解和集成，使用户能够构建复杂的负载测试场景，模拟真实用户行为或网络流量，以便评估系统的性能和稳定性。 2. **开发接口**：文档详细解释了如何使用SDK进行应用程序接口（API）调用，开发人员可以根据需求定制测试脚本，扩展LoadRunner的功能，以满足特定业务场景的需求。 3. **Warranty与法律责任**：尽管官方提供有限的保修声明，但用户需注意，此文档中的信息可能随时变更且不构成额外的保修。HP对其中的技术或编辑错误概不负责。 4. **版权与商标**：SDK包含来自Mercury Interactive (Israel) Ltd.的受版权保护的计算机软件，同时提到了Java™和Microsoft®、Windows®等商标的使用情况，这些是Sun Microsystems, Inc.和Microsoft Corporation的注册商标。 5. **受限权利**：根据美国联邦法规（FAR 12.211和12.212），此软件及其文档和技术数据适用于商业产品的标准商业许可，表明其在特定条件下可被美国政府使用。 6. **法律注意事项**：用户在使用此SDK时必须持有有效的HP授权，并明确知晓使用限制。任何未经许可的复制或分发都可能违反法律。 HP Performance Validation SDK是一个强大的工具，对于需要进行大规模压力测试并进行协议定制的软件测试团队来说，它是不可或缺的资源。通过掌握和利用这个SDK，开发人员能够提升测试效率，确保系统在高负载环境下的稳定性和性能。

Chapter 1 • HP Performance Validation SDK Overview

How Protocols Work During Recording

Recording is the process of running a client program on a Microsoft

Windows platform and saving enough of the information from the

interactions with the server so that a test script that emulates the recorded

session can be created from the data. Recording works either with API

hooking or by listening to the communication on the sockets.

Protocols that use API hooking provide a hook DLL or DLLs containing

functions with the exact same signature as the application functions to be

recorded. Custom SDK-based protocols that do not use API hooking do not

provide a recording DLL. Instead, LoadRunner records socket-level events,

HTTP events, and WEB events that protocols can process during code

generation, regardless of whether they also support API hooking.

When LoadRunner starts a recording session, it loads the hook DLLs of the

protocols that were selected by the user. If any of the selected custom SDK-

based protocols loaded require socket, web, or http information,

LoadRunner starts its processes to record that information for the protocol’s

later use. LoadRunner then runs the client application and causes it to load

the protocol hook DLLs. The result is that when the functions to be

recorded are invoked, the call is made to the appropriate protocol hook

function instead of to the client application function.

When a hook function is invoked, it sets up for recording, reports the input

arguments to LoadRunner, and invokes the client function corresponding to

the hook function. When the client function returns, the hook function

reports the results of the call to LoadRunner and returns control to the

component that called it. It returns the same value that the client function

returned, so that the intervention is invisible to the calling component.

When listening to communications on the sockets or recording HTTP

traffic, LoadRunner intercepts all messages, extracts the necessary

information, resends the outgoing messages to the server, and handles the

incoming messages to the client application.

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