Microsoft KB Archive/159975

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

Article ID: 159975

Article Last Modified on 7/16/2004

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APPLIES TO


 * Microsoft Visual Basic 4.0 Standard Edition
 * Microsoft Visual Basic 4.0 Professional Edition
 * Microsoft Visual Basic 4.0 Enterprise Edition

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This article was previously published under Q159975



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.



Steps to Reproduce Problem
 Start a new project in Visual Basic. Form1 is created by default. Place a CommandButton, Command1, on Form1.  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  Run the project by pressing the F5 key. Insert a formatted disk in the floppy, and then click Command1. Text.txt is copied to the floppy disk. Write-protect the disk and click Command1. An error message appears to remove the write-protection.</li> Remove write-protection and click Command1. Note that the same error message appears.</li></ol>

Additional query words: 4.00 vb4win vb416

Keywords: kbbug KB159975

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