DOCUMENT:Q193036 27-JAN-2001 [vbwin] TITLE :BUG: "On Error Resume Next" Enters Infinite Loop in Native Code PRODUCT :Microsoft Visual Basic for Windows PROD/VER::5.0,6.0 OPER/SYS: KEYWORDS:kbCompiler kbVBp kbVBp500bug kbVBp600bug kbOSWin95 kbOSWin98 kbGrpDSVB kbDSupport kbOSW ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual Basic Learning Edition for Windows, versions 5.0, 6.0 - Microsoft Visual Basic Professional Edition for Windows, versions 5.0, 6.0 - Microsoft Visual Basic Enterprise Edition 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 or Windows 2000, you can end this application through the Task Manager using the End Task button. On Win95/98/Me, press the CTRL+ALT+DEL key combination and select the program. Press the End Task button to close the application. Additional query words: ====================================================================== Keywords : kbCompiler kbVBp kbVBp500bug kbVBp600bug kbOSWin95 kbOSWin98 kbGrpDSVB kbDSupport kbOSWinME Technology : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB600Search kbVBA500 kbVBA600 kbVB500 kbVB600 Version : :5.0,6.0 Issue type : kbbug Solution Type : kbpending ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.