TECHNOLOGIES

Visual FoxPro is a easy-to-use and powerful tool, but sometimes its functionality is not enough to realize some tasks and the developer should search for the own solution.

We represent some of our technologies. Each of them is a result of a problem generalization and an attempt to find the universal decision, which could be used in many projects.

Primary Keys without Problems

When somebody got regular “Unique key violation” message, perhaps he would say: “Why doesn’t database do it itself”? He’s right 1000 times. Database must find a proper key value. We should teach it if it doesn’t know how to do such operation.

Friendly Grid and Learned Search 

This article was first published in the July, 2002 issue of FoxTalk

It's a fairly easy to organize data searching in the columns of the Grid object that's placed in the form. It's easy to do it in the second and the third form as well, but from here, this process tires a developer with its monotony. It's an appropriate time to create some classes that will be able to deal with both the Grid objects and their columns, and Vladimir Trukhin shows you how.

Manager of the Objects Linked by Common Data 

This article was first published in the March, 2002 issue of FoxTalk

The objects know all about themselves, but they know little about their neighbors in an application. However, as Vladimir Trukhin shows us here, each of them can affect other objects. The application needs something to notify the objects about a change of environment—the Manager of the Objects.

Remote shutdown of applications

The applications are created for the users and are started by the users. The application, being is started by the user, can work since morning and till evening. The user at this time can carefree leave his office to have dinner or to confer in an adjacent department.

The easy way to form a primary key

Probably, each developer of the database application on Visual FoxPro received the message «Unique key violation», which signals about attempt of a reuse of a primary key value of the table...

Create a report in the Microsoft WORD format.

Each, who uses Visual FoxPro, certainly, uses its powerful resource for creation of reports. You can output results of a report on the screen, the printer and even in the file without difficulty.
There is a small problem. If you output a report in the file it loses all units of formatting which you have applied to place accents and to make the report effective.
This technology is an automation of the Word Automation.

Multi-channel output into text files.

There are such tasks, in which the program makes record of data into text files from time to time...

Creeping line.

Sometimes you need to create a vivid and remembered form. In this case it is appropriate use such elements as animated images, creeping line and etc...

Where is a CDROM?

Visual FoxPro 5.0 has no special functions to define a type of disk device. Nevertheless, VFP has function, which allows doing this by indirect way...

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