FIX: Access Violation or Page Fault with Multiple Toolbars (191636)


The information in this article applies to:

  • Microsoft Visual FoxPro for Windows 3.0
  • Microsoft Visual FoxPro for Windows 3.0b
  • Microsoft Visual FoxPro for Windows 5.0
  • Microsoft Visual FoxPro for Windows 5.0a
This article was previously published under Q191636

SYMPTOMS

When running code that instantiates, docks, and releases multiple toolbars, you may see an error similar to the following under Windows NT:
Exception: access violation (0xc0000005), Address: 0x77f7d514
The following error occurs under Windows 95:
VFP caused an invalid page fault in module KERNEL32.DLL at 0137:bff78053

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been corrected in Visual FoxPro 6.0.

MORE INFORMATION

Steps to Reproduce Behavior

  1. Run the following code from a program (.prg) file: 
          #DEFINE    ARRAYSIZE       14
      DIMENSION oRef[ARRAYSIZE]
      FOR lni = 1 TO ARRAYSIZE
         oRef[lni] = CREATEOBJECT("Toolbar")
         oRef[lni].SHOW
         oRef[lni].DOCK(1)
         WAIT WINDOW "Creating "+ STR(lni) NOWA
      ENDFOR
      WAIT CLEAR
      FOR lni = 1 TO ARRAYSIZE
         WAIT WINDOW "Releasing "+ STR(lni) NOWA
         oRef[lni] = .NULL. && Use this in VFP 5, 3.0b
      ENDFOR
      WAIT CLEAR
  2. Under Windows NT, you see an error like the following:
    Exception: access violation (0xc0000005), Address: 0x77f7d514
    Under Windows 95, you will see an error like the following:
    VFP caused an invalid page fault in module KERNEL32.DLL at 0137:bff78053
NOTE: It may take multiple runs of the preceding program before you see the error occur in Windows 95.

REFERENCES

Modification Type:MajorLast Reviewed:5/12/2003
Keywords:kbbug kbcode kbfix KB191636
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