I have written a sub to send an e-mail through Outlook when I click a send button located in a WinForm. If Outlook is closed, my code works fine. When Outlook is already opened, I keep getting an error with OutMail = oApp.CreateItem(0)
An unhandled exception of type 'System.InvalidCastException' occurred in OfficeAutomation.exe
Additional information: Unable to cast COM object of type 'Microsoft.Office.Interop.Outlook.ApplicationClass' to interface type 'Microsoft.Office.Interop.Outlook._Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{00063001-0000-0000-C000-000000000046}' failed due to the following error: The RPC server is unavailable. (Exception from HRESULT: 0x800706BA).
Private Sub EmailOut_Click(sender As Object, e As EventArgs) Handles EmailOut.Click
Dim oApp As Outlook.Application = Nothing
' Check whether there is an Outlook process running.
Dim outlookRunning As Integer = Process.GetProcessesByName("OUTLOOK").Length
If outlookRunning > 0 Then
' If Outlook is running, use the GetActiveObject method to obtain the
' process and cast it to an Application object.
Try
oApp = TryCast(System.Runtime.InteropServices.Marshal.GetActiveObject("Outlook.Application"), _
Outlook.Application)
Catch generatedExceptionName As System.Exception
oApp = TryCast(Activator.CreateInstance(Type.GetTypeFromProgID("Outlook.Application")), _
Outlook.Application)
Finally
' Kill Outlook and then restart it as a last resort.
Dim workers As Process() = Process.GetProcessesByName("OUTLOOK")
For Each worker As Process In workers
worker.Kill()
worker.WaitForExit()
worker.Dispose()
Next
End Try
Else
' If Outlook is not running, create a new instance of Outlook.
oApp = New Outlook.Application()
Dim ns As Outlook.NameSpace = oApp.GetNamespace("MAPI")
Try
' try to use default profile and do not open a window
' if login fails, then we must pop up a window and let the
' user choose a profile to allow access
ns.Logon("", "", False, System.Reflection.Missing.Value)
Catch generatedExceptionName As System.Exception
' use default profile and pop up a window
ns.Logon("", "", True, True)
End Try
ns = Nothing
End If
Dim OutMail As Outlook.MailItem
OutMail = oApp.CreateItem(0)
With OutMail
If Not String.IsNullOrEmpty(EmailAdr.Text) Then
.To = EmailAdr.Text
Else
MessageBox.Show("Please enter an e-mail address", "Missing Recipient", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
Exit Sub
End If
If Not String.IsNullOrEmpty(CcAdr.Text) Then
.CC = CcAdr.Text
End If
.Subject = OutSubject.Text
.Body = OutTextBox.Text
System.Threading.Thread.Sleep(5000)
.Send()
End With
System.Threading.Thread.Sleep(5000)
oApp = Nothing
Microsoft.VisualBasic.Shell("taskkill /F /IM outlook.exe", Microsoft.VisualBasic.vbHide)
End Sub