By Marcia Akins, Andy Kramek, Rick Schummer, John Hosier
In case you are going to take advantage of VFP for greater than informal GUI adjustments for your application, this publication is a wealth of information. Concise, in-depth, and a beautiful addition in your assortment.
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Extra resources for 1001 Things You Always Wanted to Know About Visual FoxPro
FILE( lcFile ) *** File not found, so create it lnHnd = FCREATE( lcFile ) IF lnHnd < 0 Chapter 1: Controlling the VFP Environment 11 *** Cannot create the file, some sort of error! T. T. ENDIF *** Return Status Flag RETURN llRetVal The function returns a logical value that can be used to determine whether to allow the current application to continue, as the following snippet illustrates: *** Check for a second instance of the application IF ChkSFile() QUIT ENDIF Of course the catch with this approach is that your application must delete the file as part of its close-down routine (unless you really want a once-only application).
Our preferred method is to use an environment setting class and simply instantiate an object based on that class directly in the form's Load method as illustrated in the next section. Creating an environment setting class We think that the best method of setting up your own environment in a Private DataSession is to use a class. By placing all of the necessary SET commands in a method which is called by the Init method of the class, merely instantiating an object based on this class will set things up the way you want them.
Once you have suppressed this property you can put code into the form's load method to either call a procedure, or a form method, which will handle the setting of the environment. Our preferred method is to use an environment setting class and simply instantiate an object based on that class directly in the form's Load method as illustrated in the next section. Creating an environment setting class We think that the best method of setting up your own environment in a Private DataSession is to use a class.