How to Create a List or Popup of Available Volume Names

ID: Q109230

2.50b 3.00b MACINTOSH

The information in this article applies to:

Microsoft Visual FoxPro for Macintosh, version 3.0b
Microsoft FoxPro for Macintosh, version 2.5b

SUMMARY

In an application distributed to many users, who each have their own schemes for partitioning their hard disks and connecting to various network servers, you may find it useful to produce a list or popup of the available volumes. Below are several code samples showing how to create such an object.

MORE INFORMATION

You can manually create a popup (the kind controlled by a READ command) by incorporating the following code into a program:

   * Load FoxTools
   IF !'FOXTOOLS'$SET('LIBRARY')
     SET LIBRARY TO FOXTOOLS ADDITIVE
   ENDIF

   * Get the name of the boot volume
   sysDrive = JustDrive(FXSystem(0))

   * Remove the trailing colon
   sysDrive = LEFT(sysDrive, LEN(sysDrive) -1)

   * Create a popup containing all the volumes to which the Mac is
   * currently connected. The boot volume, the one containing the active
   * System Folder, is the default choice. Note the space after the caret
   * in the PICTURE clause.
   @1,1 GET m.volPop PICTURE '@^ ' + FXVolume() DEFAULT sysDrive
   READ  && Activate the list object

NOTE: Replace the row and column coordinates of the popup with ones that reflect the desired position of the object. For more information about the @ ... GET LIST command, see the FoxPro "Language Reference."

To create the same kind of popup or list using the Screen Builder, use the following code, which builds an array of volume names that can be used as the basis for a popup or list. You can place this procedure in the Cleanup and Procedures code snippet of a screen.

   PROCEDURE AVol
   * Procedure to create an array of available volumes.
   * The parameter must be passed by reference. When the procedure is
   * finished, the parameter will contain an array of the available
   * volumes.
   PARAMETER a_Volume

   IF PARAMETERS() < 1
     WAIT WINDOW 'Usage: =AVOL(@<expC>)' NOWAIT
     RETURN 0
   ENDIF

   *Open FoxTools if necessary
   IF !'FOXTOOLS'$SET('LIBRARY')
     SET LIBRARY TO FOXTOOLS ADDITIVE
   ENDIF

   * Get a semicolon-delimited list of available volumes
   volList=FXVolume()

   * Get the number of volumes in the list
   numVols = Words(volList,';')

   * Dimension the array to hold the volume names
   DIMENSION a_Volume(numVols)

   * Parse the list of volumes and stuff each value into its own array
   * element
   FOR i = 1 TO numVols
     a_Volume[i] = WordNum(volList, i, ';')
   ENDFOR

   RETURN numVols

   * END OF PROCEDURE AVol

To create the array for use by a popup or list object created in the FoxPro for Macintosh Screen Builder, initialize a variable and call procedure AVol in the Setup code snippet of the screen. For example:

   * Place the following in the SETUP code snippet of a screen
   theVols = ''
   volCount = AVol(@theVols)

In the Popup or List dialog box, specify theVols as the array that supplies the popup or list with data. For more information about creating popups and lists in the Screen Builder from an array, see the FoxPro "Developer's Guide." You can use a similar procedure in Visual FoxPro for Macintosh version 3.0b, by using properties specific to the listbox object in the Form Designer.

For more information about the FoxTools functions used in this example, see the FoxTools README file located in the FOXPRO:GOODIES:MISC folder. This file contains a complete listing of all the functions in the FoxTools function library.

Additional reference words: vFoxMac 3.00b FoxMac 2.50b FXVOLUME listbox pop- up list box KBCategory: KBSubcategory:

Keywords          : kbcode
Version           : 2.50b 3.00b
Platform          : MACINTOSH