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Figure 275 Detail View of a UserFunction Displayed in the Browser

The remote user is able to see the error in the VEE program. There is an input pin not connected on the JCT

object shown in Figure 275. The remote user could now help

you troubleshoot Solitaire.vee and resolve the error. Using a similar process of working together over the Web, you could collaborate with remote users or develop programs together.

Restricting Access to Programs Viewed over the Web

When you make a VEE program available on the Web, you may still want to restrict remote users from seeing certain parts of it. If remote users currently know the URL to your

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N O T E system, you want to make sure that only certain remote users are able to access particular programs or Web directory files.

To prevent remote users from viewing parts of a VEE program on the Web, you can protect the program in three different ways:

Change the port number in the Default Preferences

⇒ Web

Server folder so only authorized users may view the program.

- OR-

Create a secured RunTime version of the VEE program. This will ensure that none of the program code can be viewed.

For more information, refer to “Securing a Program

(Creating a RunTime Version)" on page 416.

- OR-

Create an HTML file with the exact name of the command you want to disable, and save it in the VEE www directory.

The browser always accesses any *.html file before going to

VEE. In this way, you can intercept requests from remote users and display an HTML page with the appropriate warning or comments.

For example, you might want to prevent remote users from seeing the Detail view of a VEE program. You could create a file in a program such as MS Word and save it as

ViewMainDetail.html in the www directory. In the file, you put the message you want the remote user to see.

When the remote user chooses Main Detail in the VEE Web

Server Home Page or enters a URL with the option

ViewMainDetail, the browser does not display the main VEE program in detail view. Instead, the browser accesses the

ViewMainDetail.html file in the www directory and displays the

file you created. Figure 276 shows an example of what you

could display to a remote user.

Make sure the file name is the file name of a VEE web command, and that it is located in the Root Directory specified in Web Server.

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Figure 276 Example of Displaying HTML Message Instead of VEE Program

You could also use an *.html file for other purposes, such as putting password protection on a VEE program so that only

users with the password can view the program. Figure 277

shows an example of password protection.

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Figure 277 An Example of a Password Window

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Platform Specifics and Web Monitoring Chapter 13

Chapter Checklist

You should now be able to perform the following tasks:

• Explain how to use the Callable VEE ActiveX Automation

Server, and when you would use it.

• Explain how you could integrate VEE functionality into other applications or programs.

• Explain the key concepts in using the web to monitor VEE programs.

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Appendix

Appendix A: Additional Lab Exercises

General Programming Techniques 499

Using Strings and Globals 514

Optimizing Techniques 516

UserObjects 518

Agilent VEE UserFunctions 521

Creating Operator Panels and Pop-ups 528

Working with Files 533

Records 535

Test Sequencing 541

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Appendix

Additional Lab Exercises

The following exercises give you a chance to practice the VEE concepts you have learned in this book. The exercises are divided into categories.

To use this appendix, develop a solution and then compare it to the answers listed. There are many ways to program a given task, so you have a valid solution if it meets the problem specifications. However, programs that execute more quickly and are easier to use are probably better solutions. Each solution includes a short discussion of key points.

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Appendix

General Programming Techniques

Apple Bagger

You want to know how many apples it takes to fill a ten pound basket. Create a VEE program that counts how many apples it takes to fill the basket. Each apple weighs between 0 and 1 pound.

Suggestions

This program can be created with 10 or fewer objects. Choose from the following objects:

Start

Until Break random() function

Accumulator

Break

Real64

Conditional (A>=B)

Stop

Counter

If/Then/Else

Alphanumeric

N O T E

The VEE programs for many of the lab exercises and programming examples in this manual are included in VEE, under Help

⇒ Open

Example...

⇒ Manual ⇒ UsersGuide.

Solution 1—Apple Bagger

Figure 278 shows one solution to the Apple Bagger exercise.

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