DOCUMENT:Q186842 11-JAN-2001 [vbwin] TITLE :BUG: OpenURL Method Bug in Internet Transfer Control PRODUCT :Microsoft Visual Basic for Windows PROD/VER::4.01,5.0 OPER/SYS: KEYWORDS:kbVBp500 ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - 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 - Microsoft Internet Explorer version 4.01 for Windows NT 4.0 - Microsoft Internet Explorer version 4.01 for Windows 95 ------------------------------------------------------------------------------- SYMPTOMS ======== When you use the OpenURL method on the Internet Transfer Control for FTP URLs, it causes the application to hang. Upon exiting the application, the application hangs and causes 100% CPU utilization. When you use code similar to the following: Private Sub butGet_Click() Dim sData as String Inet.AccessType = icDirect sData = Inet.OpenURL ("ftp://ftp.somedomain.com/SomeFile.txt") End Sub And, you use the Internet Transfer Control, the application hangs and further ITC requests fail. Upon exiting the application, the GUI portion of the application closes, however the Task Manager (under Windows NT) displays the application as running and utilizing 100% of the CPU. You can terminate the application only through the Task Manager. RESOLUTION ========== The workaround to this bug is to either use the Execute method or use the WinInet APIs directly. For example, the Execute method could be: Private Sub butGet_Click() Inet.AccessType = icDirect Inet.URL = "ftp://ftp.somedomain.com/SomeFile.txt" Inet.Execute "", "GET" End Sub Private Sub Inet_StateChanged(ByVal State As Integer) Dim sData As String If State = 12 Then sData = Inet.GetChunk(4096) 'SomeFile.txt < 4KB in size. End If End Sub For an example of the WinInet API, please see the VBFTP sample referred to in the following article in the Microsoft Knowledge Base: Q175179 : FILE: VBFTP.EXE: Implementing FTP Using WinInet API from VB STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available. MORE INFORMATION ================ Steps to Reproduce Behavior --------------------------- Use the following code in any Visual Basic 5.0 project that uses the Internet Transfer Control: Private Sub butGet_Click() Dim sData as String Inet.AccessType = icDirect sData = Inet.OpenURL ("ftp://ftp.somedomain.com/SomeFile.txt") End Sub Additional query words: kbVBp600bug kbVBp500bug kbDSupport kbdsi kbInternet kbFTP kbhttp ====================================================================== Keywords : kbVBp500 Technology : kbVBSearch kbIEsearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVBA500 kbVB500 kbIENT400Search kbIE95Search kbZNotKeyword3 kbIE401Win95 kbIE401WinNT400 Version : :4.01,5.0 Issue type : kbbug ============================================================================= 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.