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    <p>Judging by the link to <a href="http://discussion.autodesk.com/forums/thread.jspa?threadID=332207" rel="nofollow noreferrer">AutoDesk</a>'s forum on this topic, it sounds like as you need to close the object after saving...and remove the null's...If I were you, I'd wrap up the code into <code>try</code>/<code>catch</code> blocks to check and make sure there's no exception being thrown!</p> <p>I have to question the usage of the using clause, as you're <code>Launch</code>ing another copy aren't you? i.e. within the <code>OpenDrawing</code> and <code>Save</code> functions you are using <code>this._acadApplication</code> or have I misunderstood?</p> <pre> using (AutoCad cad = AutoCad.Instance) { try{ // Launch AutoCAD cad.Launch(); // Open drawing cad.OpenDrawing(@"C:\Scratch\Drawing01.dwg"); // Save it cad.SaveAs(@"C:\Scratch\Drawing01B.dwg"); }catch(COMException ex){ // Handle the exception here } } public void Launch() { this._acadApplication = null; const string ProgramId = "AutoCAD.Application.18"; try { // Connect to a running instance this._acadApplication = (AcadApplication)Marshal.GetActiveObject(ProgramId); } catch (COMException) { /* No instance running, launch one */ try { this._acadApplication = (AcadApplication)Activator.CreateInstance( Type.GetTypeFromProgID(ProgramId), true); } catch (COMException exception) { // Failed - is AutoCAD installed? throw new AutoCadNotFoundException(exception); } } /* Listen for the events we need and make the application visible */ this._acadApplication.BeginOpen += this.OnAcadBeginOpen; this._acadApplication.BeginSave += this.OnAcadBeginSave; this._acadApplication.EndOpen += this.OnAcadEndOpen; this._acadApplication.EndSave += this.OnAcadEndSave; #if DEBUG this._acadApplication.Visible = true; #else this._acadApplication.Visible = false; #endif // Get the active document // this._acadDocument = this._acadApplication.ActiveDocument; // Comment ^^^ out? as you're instantiating an ActiveDocument below when opening the drawing? } public void OpenDrawing(string path) { try{ // Request AutoCAD to open the document this._acadApplication.Documents.Open(path, false, null); // Update our reference to the new document this._acadDocument = this._acadApplication.ActiveDocument; }catch(COMException ex){ // Handle the exception here } } public void SaveAs(string fullPath) { try{ this._acadDocument.SaveAs(fullPath, null, null); }catch(COMException ex){ // Handle the exception here }finally{ this._acadDocument.Close(); } } </pre> <p>Thought I'd include some links for your information. </p> <ul> <li>'<a href="http://through-the-interface.typepad.com/through_the_interface/2007/03/closing_all_ope.html" rel="nofollow noreferrer">Closing Autocad gracefully</a>'.</li> <li>'<a href="http://cupocadnet.blogspot.com/2009/06/migrating-autocad-com-api-applications.html" rel="nofollow noreferrer">Migrating AutoCAD COM to AutoCAD 2010</a>'.</li> <li>'<a href="http://www.objectarx.net/bbs/viewthread.php?action=printable&amp;tid=2735" rel="nofollow noreferrer">Saving AutoCAD to another format</a>'</li> </ul> <p>Hope this helps, Best regards, Tom.</p>
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    1. COThanks for trying Tom. No exception is being thrown - the app is hanging within AutoCAD's AcadDocument.SaveAs method - it even hangs AutoCAD not just my application. I cannot remove the NULLs because the SaveAs method requires 3 parameters, but there's no documentation telling me what to pass as the other 2 parameters. I also cannot close the drawing because I need to carry on working with it once its saved.
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    2. CONo I'm not launching another copy of AutoCAD, the code in the Launch() method uses the instance that's already running (which is then referenced by _acadApplication.) When you launch AutoCAD, it creates a blank document which you need to be able to send AutoCAD commands, hence the line you've commented out is required by my application. When Documents.Open() is called, it creates a new document and my app then references that one instead of the initial blank document.
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    3. CO@Andy: That's funny, in the links I provided, there is one parameter for the save?! Unless the COM has changed for the more recent release of AutoCAD - what version of AutoCAD actually are you using?
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