有时候用 "CreateObject("Inventor.Application")"来启动Inventor会失败，但是随后再执行这个命令时Inventor又会成功启动，这是怎么回事？下面是我们的技术专家的解释以及解决办法：
Inventor starts up very slowly when none of its DLLs are in the system's file cache. Restarting the computer clears the file cache so that the first instantiation of Inventor takes a very long time to initialize. When Inventor is started via automation,it must call CoRegisterClassObject within two minutes of the process starting,or else COM assumes the process Failed to start and raises a CO_E_SERVER_EXEC_FAILURE 0x80080005 exception in the calling program. This has the effect of killing the inventor.exe process providing the caller with a useless pointer/reference and potentially an unhandled exception. Subsequent attempts to start inventor.exe will use the DLLs in the file cache and the process generally starts much more quickly and does not time out
You can pre-load the libraries by running and exiting Inventor prior to running a utility program. This process is generally needed only one time after each computer restart; subsequent use of the utility programs will reuse the cached libraries loaded earlier in the Windows session. If you have multiple releases of Inventor installed,be sure to run and exit the Inventor release that matches the version number of the utility program you would like to run. Running and exiting a specific release of Inventor will set a value in the Windows registry so the utility programs can detect which installation is active.
An alternative solution is to launch Inventor as a local COM server: in this case the timeout can be up to three minutes and it is generally enough to allow the process to run. The following VB.NET sample shows how to accomplish this.
解决办法如下：
Imports Microsoft.Win32
Public Class clsLocalSrv
Public Shared Function StartAsLocalServer(ByVal ProgId As String,_
ByVal nMilliSeconds As Integer,_
ByRef oApplication As Object) As Boolean
Dim enUS As New Globalization.CultureInfo("en-US")
Threading.Thread.CurrentThread.CurrentCulture = enUS
Dim commandName As String = ""
Dim arguments As String = ""
Dim oRegKey As Microsoft.Win32.RegistryKey,oCls As Microsoft.Win32.RegistryKey
Dim oVal As Object,sName As String,oDir As Object
Try
oCls = Registry.ClassesRoot
oRegKey = oCls.OpenSubKey(ProgId + "//CLSID",False)
oVal = oRegKey.GetValue("",Nothing)
oRegKey = oCls.OpenSubKey("CLSID//" & oVal & "//LocalServer32",False)
oDir = oRegKey.GetValue("",Nothing)
oRegKey.Close()
oCls.Close()
sName = oDir
Dim nIndex As Long
nIndex = Microsoft.VisualBasic.InStrRev(sName,"/automation",CompareMethod.Text)
commandName = Microsoft.VisualBasic.Left(sName,nIndex - 1)
arguments = Microsoft.VisualBasic.Right(sName,(sName.Length() - nIndex + 1))
Catch ex As Exception
MsgBox(ex.Message)
Exit Function
End Try
' Start the program
Dim oProcess As Process = Process.Start(commandName,arguments)
' Loop until run out of time or get the process's object.
Dim Start,Finish As Double
Start = Microsoft.VisualBasic.DateAndTime.Timer
Finish = Start + (nMilliSeconds / 1000)
Do While Microsoft.VisualBasic.DateAndTime.Timer < Finish
Try
oApplication = System.Runtime.InteropServices.Marshal.GetActiveObject(ProgId)
If Not oApplication Is Nothing Then
Return True
End If
Catch ex As Exception
' Keep trying until run out of time
End Try
System.Threading.Thread.Sleep(100)
Loop
' Failed to get the running object,stop the process
oProcess.Kill()
Return False
End Function
End Class
If clsLocalSrv.StartAsLocalServer("Inventor.Application",120000,m_inventorApp) = True Then
'...
End If
如果你用的不是VB.NET，而是VB，那么替换的办法也许是用定时器(Timer)来替代上面的Thread，并用GetObject来替换上面的System.Runtime.InteropServices.Marshal.GetActiveObject来做类似的工作。