BUG: FileCopy Does Not Reset Err if Floppy is Write-Protected

• Standard, Professional, and Enterprise Editions of Microsoft Visual Basic, 16-bit only, for Windows, version 4.0

SYMPTOMS

The Err object is not reset after you try to copy a file to a write- protected floppy disk and the FileCopy command fails with a "Permission Denied" error. This makes it impossible to copy the file again, even after you remove the write-protection on the floppy disk.

WORKAROUND

The Kill command is not affected in this way and can be carried out before the FileCopy command. This enables the Kill command to detect the "Permission Denied" error first and allows you to remove the write- protection on the floppy disk before you carry out the FileCopy command. Do the following:

   Private Sub Command1_Click()
   Dim source As String
   Dim target As String

      On Error GoTo err_handler

      source = "c:\test.txt"

      Open source For Output As #1
      Write #1, "This is a test."
      Close #1

      target = "a:\test.txt"

      If Dir(target) <> "" Then Kill target
      FileCopy source, target

   Exit Sub
   err_handler:

      If Err.Number = 70 Then
          MsgBox "Permission denied. Please remove write-protection."
          Resume
      ElseIf Err.Number = 71 Then
          MsgBox "Disk not ready. Please insert a disk."
          Resume
      End If

   End Sub

STATUS

Microsoft has confirmed this to be an issue in the Microsoft products listed at the beginning of this article. Microsoft is researching this issue and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps to Reproduce Problem

1. Start a new project in Visual Basic. Form1 is created by default.

2. Place a CommandButton, Command1, on Form1.

3. Place the following code in the Command1_Click event:

      Private Sub Command1_Click()
      Dim source As String
      Dim target As String
   
         On Error GoTo err_handler
   
         source = "c:\test.txt"
   
         Open source For Output As #1
         Write #1, "This is a test."
         Close #1
   
         target = "a:\test.txt"
   
         FileCopy source, target
   
      Exit Sub
      err_handler:
   
         If Err.Number = 70 Then
             MsgBox "Permission denied. Please remove write-protection."
             Resume
         ElseIf Err.Number = 71 Then
             MsgBox "Disk not ready. Please insert a disk."
             Resume
         End If
   
      End Sub
   
   

4. Run the project by pressing the F5 key.

5. Insert a formatted disk in the floppy, and then click Command1. Text.txt is copied to the floppy disk.

6. Write-protect the disk and click Command1. An error message appears to remove the write-protection.

7. Remove write-protection and click Command1. Note that the same error message appears.