Q104345: How to Determine If a Library Is Loaded in Memory

Article: Q104345
Product(s): Microsoft FoxPro
Version(s): MS-DOS:2.0,2.5,2.5a,2.5b,2.6; WINDOWS:2.5,2.5a,2.5b,2.6,2.6a,3.0
Operating System(s): 
Keyword(s): kbcode
Last Modified: 05-FEB-2000

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, version 3.0 
- Microsoft FoxPro for Windows, versions 2.5, 2.5a, 2.5b, 2.6, 2.6a 
- Microsoft FoxPro for MS-DOS, versions 2.0, 2.5, 2.5a, 2.5b, 2.6 
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SUMMARY
=======

To see if an external library (.PLB file in the MS-DOS environment, .FLL file in
the Windows environment) has been loaded by means of the SET LIBRARY TO command,
use the code example shown below.

MORE INFORMATION
================

The SET LIBRARY TO command allows API libraries to be loaded into memory. The
following code example will allow a program to determine if a specific library
has been loaded.

     * Use the set of commands appropriate for the product installed

     * From the FoxPro for MS-DOS root directory
     SET LIBRARY TO netware.plb ADDITIVE   &&Not avail. in 2.0 single user
     SET LIBRARY TO goodies\pdrivers\driver2.plb ADDITIVE

     * From the FoxPro for Windows root directory
     SET LIBRARY TO driver2.fll ADDITIVE
     SET LIBRARY TO foxtools.fll ADDITIVE

     *From the Visual FoxPro root directory
     SET LIBRARY TO reserved.fll ADDITIVE
     SET LIBRARY TO foxtools.fll ADDITIVE

     * In both MS-DOS and Windows:
     * To check if a library has been loaded:

     isloaded = "<the name of the library>" $ SET("LIBRARY")
     IF isloaded
        WAIT WINDOW "<Library name> has been loaded"
     ELSE
           WAIT WINDOW "<Library name> has not been loaded"
     ENDIF

     * To clear all libraries from memory
     SET LIBRARY TO

     * End code example

The SET("LIBRARY") function returns a string containing the names of all external
API libraries currently loaded, with a comma between the library names. The $
operator is used to search anywhere within the string for the name of a specific
library.

Additional query words: VFoxWin FoxDos FoxWin

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Keywords          : kbcode 
Technology        : kbVFPsearch kbAudDeveloper kbFoxproSearch kbZNotKeyword3 kbFoxPro200DOS kbFoxPro250DOS kbFoxPro250aDOS kbFoxPro250bDOS kbFoxPro260DOS kbFoxPro260 kbFoxPro250 kbFoxPro250a kbFoxPro250b kbFoxPro260a kbVFP300
Version           : MS-DOS:2.0,2.5,2.5a,2.5b,2.6; WINDOWS:2.5,2.5a,2.5b,2.6,2.6a,3.0

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