How to Determine If a Library Is Loaded in Memory

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.