By Marcia Akins, Andy Kramek, Rick Schummer, John Hosier
If you are going to exploit VFP for greater than informal GUI alterations for your application, this booklet is a wealth of information. Concise, in-depth, and a stunning addition in your assortment.
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Extra info for 1001 Things You Always Wanted to Know About Visual FoxPro
Example text
LcSys16 = SYS(16, 1) *** Save current working directory lcOldDir = (SYS(5)+CURDIR()) *** Make the directory from which it was run current lcProgram = SUBSTR(lcSys16, AT(":", lcSys16) - 1) CD LEFT(lcProgram, RAT("\", lcProgram)) IF INLIST( JUSTEXT( lcProgram ), "FXP", "SCX" ) 10 1001 Things You Always Wanted to Know About Visual FoxPro *** If we are running a PRG/Form directly, then find the parent directory CD .. *** Set up path to include VFP Home plus the standard DEV directory tree lcPath = (HOME()+';'+SYS(5)+CURDIR()+";DATA;FORMS;LIBS;PROGS;UTILS") ELSE *** We are using an EXE/APP!
Within the hour they have six copies of the application running and are complaining that their machine is slowing down. What to do? ) There are actually several approaches that can be taken, as described below. Using a 'semaphore' file This is probably the simplest approach of all. It relies on your application creating, on first launch, a zero-byte file whose sole purpose is to indicate that the application is running. : returns a flag ******************************************************************************* FUNCTION ChkSFile( tcAppName ) LOCAL lcAppName, lcFile, lnHnd, llRetVal *** Default lcAppName if nothing passed lcAppName = IIF( EMPTY(tcAppName) OR VARTYPE( tcAppName ) # "C", ; 'apprun', LOWER( ALLTRIM( tcAppName ) ) ) *** Force a TXT extension for the semaphore file in current directory lcFile = (SYS(5) + CURDIR() + FORCEEXT( lcAppName, 'txt' )) *** Now check for the file?
But there is a catch! In order to use Show Window, the named window must have been defined to VFP and even though the System Toolbars are generated by VFP, there is no way of actually defining or activating the toolbars programmatically. The consequence is that unless a toolbar is first activated by VFP itself, you cannot later make it visible. The only toolbars that can be made visible by default are the 'Standard', 'Layout' and 'Form Designer' but there does Chapter 1: Controlling the VFP Environment 19 not seem to be any reliable way of programmatically forcing any of the other system toolbars to be made visible at startup.