PRB: Receiving Error when Selecting 254th Item in List Box

• Microsoft Visual FoxPro for Windows, version 5.0

SYMPTOMS

When selecting an item in a list box or combo box, one or more of the following errors can occur:

• Alias 'DYNAMICFONTUNDERLINE' is not found.
• Alias DYNAMICFONTSTRIKETHRU is not found.
• VFP caused an invalid page fault in module Vfp.exe.
• Syntax error.
• Variable '' is not found.
• Alias '' is not found.

When selecting the 253rd item in the list box, it may be necessary to move the focus to another object and then back to the 254th item in the list box to get one of the errors to occur.

In the Combo box, just selecting the 253rd item and trying to click to display the combo list again triggers an error. These errors occur on any table as long as the table has 254 or more records.

RESOLUTION

There are two ways to prevent these errors from occurring. One is to create an array and change the RowSourceType property of the List or Combo box to Array and the RowSource property to that array name. The second is to use the Additem method to populate the list box or combo box. Below is a code example that could be added to the Init event of a list box or combo box to populate it. This code assumes that the table is already open.

   GO TOP
   FOR x = 1 TO RECCOUNT()
     THIS.ADDITEM(<field name>)  && Insert field from the table into list
     SKIP
   NEXT

STATUS

Microsoft is researching this behavior and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Behavior

1. Create a form and add the Orders table from the Visual FoxPro Samples\Data folder to the DataEnvironment.

2. Add a list box and command button to the form.

3. Set the RowSourceType property of the list box RowSourceType to Alias and the RowSource property to the field Order_id.

4. In the Click event of the command button, add the following code:

         WAIT WINDOW STR(RECNO())
   

5. Run the form and move through the list box until the item 10252 appears.

6. Click on the command button, and then click back to the item 10253 in the list box. Note that one of the errors listed above occurs.