CopyFileEx error...

[hzgt9b]

I've been executing the CopyFileEx code below in a Windows Application for
several months...

Try
If CopyFileEx(fiSource.FullName, strTargetFile, Fpr, ACTION_COPY, 0,
0) 0 Then
Else
Throw New System.ComponentModel.Win32Exception( _
System.Runtime.InteropServices.Marshal.GetLastWin3 2Error)
End If
Catch ex As Exception
msgbox ex.Message
End Try

But now its bombing when it encounters a file containing 0 bytes. The error
message I'm getting is:

Run-time exception thrown : System.OverflowException - Value was either
too large or too small for an Int32.

Any idea why the CopyFileEx return value is causing an overflow? How can I
deal with this problem?

Any help would be greatly appreicated!

[Mattias Sjögren]

>Any idea why the CopyFileEx return value is causing an overflow? How can I
deal with this problem?

Probably due to an incorrect API declaration. The return type should
be a Boolean.
Mattias

--
Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[hzgt9b]

I figured out the problem... my delegate function had a bug... I was dividing
by zero when the filesize of the file being copied was 0.

Note this declaration:
Dim Fpr As New FileProgressRoutine(AddressOf FileProgress)

ORIGINAL
Private Function FileProgress( _
ByVal totalFileSize As Int64, _
ByVal totalBytesTransferred As Int64, _
ByVal streamSize As Int64, _
ByVal streamBytesTransferred As Int64, _
ByVal dwStreamNumber As Int32, _
ByVal dwCallbackReason As Int32, _
ByVal hSourceFile As Int32, _
ByVal hDestinationFile As Int32, _
ByVal lpData As Int32) As Int32
Me.pgAction.Value = Convert.ToInt64((totalBytesTransferred *
100.0 / totalFileSize))

CHANGED
Private Function FileProgress( _
ByVal totalFileSize As Int64, _
ByVal totalBytesTransferred As Int64, _
ByVal streamSize As Int64, _
ByVal streamBytesTransferred As Int64, _
ByVal dwStreamNumber As Int32, _
ByVal dwCallbackReason As Int32, _
ByVal hSourceFile As Int32, _
ByVal hDestinationFile As Int32, _
ByVal lpData As Int32) As Int32
If totalFileSize 0 Then
Me.pgAction.Value = Convert.ToInt64((totalBytesTransferred *
100.0 / totalFileSize))
End If

"hz****@nopost.com" wrote:

I've been executing the CopyFileEx code below in a Windows Application for
several months...

Try
If CopyFileEx(fiSource.FullName, strTargetFile, Fpr, ACTION_COPY, 0,
0) 0 Then
Else
Throw New System.ComponentModel.Win32Exception( _
System.Runtime.InteropServices.Marshal.GetLastWin3 2Error)
End If
Catch ex As Exception
msgbox ex.Message
End Try

But now its bombing when it encounters a file containing 0 bytes. The error
message I'm getting is:

Run-time exception thrown : System.OverflowException - Value was either
too large or too small for an Int32.

Any idea why the CopyFileEx return value is causing an overflow? How can I
deal with this problem?

Any help would be greatly appreicated!