BUG: "On Error Resume Next" Enters Infinite Loop in Native Code

• Microsoft Visual Basic Learning, Professional, and Enterprise Editions for Windows, versions 5.0, 6.0

SYMPTOMS

After compiling to native code, a Visual Basic application using "On Error Resume Next" together with a For loop may sometimes enter an infinite loop when running as a standalone executable.

RESOLUTION

To work around this behavior, the code can be restructured. The code provided below resolves the problem for the code that reproduces this bug in the "Steps To Reproduce Behavior" section of this article:

   Public Sub Form_Load()
      On Error Resume Next
      Dim x As Integer
      Dim z as integer
      Dim mArray as Variant
      z = UBound(mArray)
         For x = 0 To z
            MsgBox "clear"
         Next x
   End Sub 

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

MORE INFORMATION

Steps to Reproduce Behavior

1. Create a standard EXE project in Visual Basic. Form1 is created by default.



2. Paste the following code into Form1:

   
         Public Sub Form_Load()
            On Error Resume Next
            Dim x As Integer
            Dim mArray as Variant
            For x = 0 To UBound(mArray)
               MsgBox "Test"
            Next x
         End Sub
    




3. Select Properties from the Project menu. Under the Compile tab, select Compile to Native Code



4. Run the project by pressing the F5 key. Note that the message box displays only once.



5. Select Make Project1.exe to compile the project.



6. Run the compiled executable.
   
   Instead of displaying one message box, an endless number message boxes are displayed.
   
   On Windows NT, you can terminate this application through the Task Manager using the End Task button.
   
   On Win95/98, press the CTRL+ALT+DEL key combination and select the program. Press the End Task button to close the application.

Additional query words: kbdss kbDSupport kbVBp kbVBp600bug kbVBp500bug kbCompiler

Keywords : kbGrpVB
Version : WINDOWS:5.0,6.0
Platform : WINDOWS
Issue type : kbbug