BUG: Calling AsyncRead on a File Twice Causes Error 698 (190846)


The information in this article applies to:

  • Microsoft Visual Basic Learning Edition for Windows 6.0
  • Microsoft Visual Basic Professional Edition for Windows 6.0
This article was previously published under Q190846

SYMPTOMS

When the all of the following conditions are true:

  • You are calling AsyncRead on local files.
  • You are using the same value for the PropertyName argument.
  • You make the two calls successively.
the following error message is displayed: 
   Error 698: PropertyName parameter conflicts with the PropertyName of
              an AsyncRead in progress
Because the AsyncRead is being performed on a local file, the download should be happening synchronously. This means that it should be okay to issue AsyncRead twice in succession.

RESOLUTION

If you wish to force Synchronous download, use the AsyncReadOption: "vbAsyncReadSynchronousDownload" in your call to AsyncRead.

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

  1. Create a ActiveX Document DLL project in Visual Basic.
  2. Put the following code into your Userdocument_Click() handler: 
          AsyncRead "c:\windows\Triangles.bmp", vbAsyncTypePicture, "def"
      AsyncRead "c:\windows\Triangles.bmp", vbAsyncTypePicture, "def"
  3. Compile the project into a DLL.
  4. Start Internet Explorer 4.x and navigate to your .VBD file.
  5. Click on the Document and note that you see the above-mentioned error message.
Modification Type:MajorLast Reviewed:11/21/2003
Keywords:kbbug KB190846
©2003 Microsoft Corporation. All rights reserved.