PC Forms: Working with Multiple-Selection List Boxes

MORE INFORMATION

The WriteTaggedControls function does not include code to automatically package a multiple-selection list box. You can, however, add code to the WriteMessage and ReadMessage functions so the selected items in a multiple- selection list box are transferred to the Read form.

The following example shows the code that should be added to each function.

1. Add the following code to the WriteMessage function in the EFORM.BAS file. Note the comments that describe the various steps.

   'Declare the variables
      Dim n As Integer
      Dim theText As String
      Dim theTotal As Long
   
      'Process the list, writing each item to the package using a unique
      'itemID,
       ("List0". "List1", etc.)
      theTotal = 0
      For n = 0 To (frmCompose.lstColor.ListCount - 1)
         If frmCompose.lstColor.Selected(n) = True Then
           theText = frmCompose.List1.List(n)
           MEFWriteText gPackage, "List" & Str$(theTotal), theText
           theTotal = theTotal + 1
         End If
      Next
   
      'Write the number of items to the package
      MEFWriteLong gPackage, "theTotal", theTotal
   						

2. Add the following code to the ReadMessage function to unpackage the data:

   'Declare variables
      Dim n As Integer
      Dim theTotal As Long
   
      'Find the number of items in the list by reading the package.
      theTotal = MEFReadLong(gPackage, "theTotal", 0)
   
      'Read in each of the items and add it to the list using AddItem
      For n = 0 To theTotal
         frmRead.lstColor.AddItem MEFReadText(gPackage, "List" & Str$(n), "")
      Next