DOCUMENT:Q171835 11-JAN-2001 [vbwin] TITLE :FIX: Crash When Viewing Data Tips on ParamArray PRODUCT :Microsoft Visual Basic for Windows PROD/VER:5.0 OPER/SYS: KEYWORDS:kbVBp500 kbVS97sp2fix kbGrpDSVB kbvbp500sp2fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual Basic Control Creation Edition for Windows, version 5.0 - Microsoft Visual Basic Learning Edition for Windows, version 5.0 - Microsoft Visual Basic Professional Edition for Windows, version 5.0 - Microsoft Visual Basic Enterprise Edition for Windows, version 5.0 ------------------------------------------------------------------------------- SYMPTOMS ======== A crash may occur while trying to display Data Tips in the IDE. This can occur when you have a variant that contains an array of non-variants and pass the element of that array to a ParamArray. STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Visual Studio 97 Service Pack 2. For more information on the Visual Studio 97 Service Pack 2, please see the following article in the Microsoft Knowledge Base: Q170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why For a list of the Visual Basic 5.0 bugs that were fixed in the Visual Studio 97 Service Pack 2, please see the following article in the Microsoft Knowledge Base: Q171554 INFO: Visual Basic 5.0 Fixes in Visual Studio 97 Service Pack 2 MORE INFORMATION ================ Steps to Reproduce Behavior --------------------------- 1. Start a new Standard EXE Project in Visual Basic 5.0. 2. Click on Project | Add Module to add a basic module to the project. Note that if you have Visual Basic 5.0 set up to automatically include "Option Explicit" to new modules, remove this line. 3. In the General Declarations area of the module, add the following code: Sub main() Dim x(5) as integer v = x r = Formt("????", v(5)) End Sub Public Function Formt(str As String, ParamArray rgArgs()) As String Dim var As Variant Dim iPos As Integer, iLastPos As Integer Dim strRet As String iPos = 0 iLastPos = 1 For Each var In rgArgs iPos = InStr(iPos + 1, str, "?") If iPos < 1 Then Exit For strRet = strRet & Mid(str, iLastPos, iPos - iLastPos) strRet = strRet & var iLastPos = iPos + 1 Next If Len(str) > iPos Then strRet = _ strRet & Right(str, Len(str) - (iPos)) Formt = strRet End Function 4. From the Project menu select the Project1.Properties. On the General tab, make Sub Main the Startup Object. 5. Press the F5 key to run this program. 6. You will get a Type Mismatch error. Click on the dialog's Debug button. 7. In the following line of code: strRet = strRet & Mid(str, iLastPos, iPos - iLastPos) move the mouse pointer over the variable str to display the Data Tips. Once the Data Tip for this variable has been displayed, move to the next variable, iLastPos, to display its Data Tip. Go back and forth between the two variables several times. 8. Go to the following line of code: Public Function Format(str As String, ParamArray rgArgs()) _ As String and move the mouse pointer over rgArgs. At this point an Invalid Page Fault and an application error in Visual Basic is displayed. Additional query words: ====================================================================== Keywords : kbVBp500 kbVS97sp2fix kbGrpDSVB kbvbp500sp2fix Technology : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVBA500Search kbVBA500 kbVB500 kbZNotKeyword3 Version : 5.0 Issue type : kbbug Solution Type : kbfix ============================================================================= 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.