Autodesk.AutoCAD.Interop

JosephAugustino — Tue, 31 Jul 2018 21:38:32 GMT

I'm trying to start AutoCAD using COM Interop but can't get it to work. If I manually start AutoCAD and set the variable "STARTUP" to 3, everything works. If I leave it at the default value of 2, it won't. My AcadApplication is valid but all of the methods throw exceptions. Here's a code snippet:

                    try
                    {
                        pACADApp = (AcadApplication)Marshal.GetActiveObject(szProgramId);
                        fWasAutoCADRunning = true;
                    }
                    catch (COMException)
                    {
                        try
                        {
                            pACADApp = new AcadApplication();
                        }
                        catch (Exception) { }
                    }

                    if (pACADApp == null)
                    {
                        Application.Current.Dispatcher.Invoke(() =>
                        {
                            string szErrorMsg = string.Format("Failed to create an instance of AutoCAD. Please ensure AutoCAD is properly installed on this computer before processing.\n\nExpected program id: {0}", szProgramId);
                            GenericMessageBox pErrorDlg = new GenericMessageBox("Process Failed", szErrorMsg, GenericMessageBox.MessageBoxButtons.OK, GenericMessageBox.MessageBoxIcon.Error);
                            pErrorDlg.Owner = pMainWindow;
                            pErrorDlg.ShowDialog();
                        });
                        return;
                    }

                    this.pProgress.szPrimaryStatus = "Sending AutoCAD command";

                    //  Wait for AutoCAD to finish opening
                    while (true)
                    {
                        try
                        {
                            pACADApp.Visible = true;
                            pACADApp.WindowState = Autodesk.AutoCAD.Interop.Common.AcWindowState.acMin;
                            break;
                        }
                        catch { }
                    }

It fails to clear the "while (true)" loop. pACADApp.Visible throws an exception. In fact, all of the methods of pACADApp throw exceptions.

Any help would be appreciated.

Thanks,

Joe

Re: Autodesk.AutoCAD.Interop

Virupaksha_aithal — Mon, 13 Aug 2018 06:08:09 GMT

Hi,

Are you getting COM calls rejected error? Have you implemented IMessageFilter as shown in http://through-the-interface.typepad.com/through_the_interface/2010/02/handling-com-calls-rejected-by-autocad-from-an-external-net-application.html

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Autodesk.AutoCAD.Interop

Re: Autodesk.AutoCAD.Interop