Question

Am trying to print a file from server side via a WCF service deployed on IIS machine.
The following code gets worked on Win 2oo3 machine perfectly. But the same code is throwing a COM exception. Any idea about this. I guess its related to some permissions.
Here is the code

public void Print(string htmlFilename, string printer, short copies)
        {
            string currDefault = string.Empty;
            try
            {
                currDefault = GetDefaultPrinter();
                myPrinters.SetDefaultPrinter(printer);
                for (int i = 0; i < copies; i++)
                {
                    documentLoaded = false;
                    documentPrinted = false;

InternetExplorer  ie = new InternetExplorer  ();
                    ie.DocumentComplete += new SHDocVw.DWebBrowserEvents2_DocumentCompleteEventHandler(ie_DocumentComplete);
                    ie.PrintTemplateTeardown += new SHDocVw.DWebBrowserEvents2_PrintTemplateTeardownEventHandler(ie_PrintTemplateTeardown);
                    object missing = Missing.Value;

                    ie.Navigate(htmlFilename, ref missing, ref missing, ref missing, ref missing);
                    while (!documentLoaded && ie.QueryStatusWB(SHDocVw.OLECMDID.OLECMDID_PRINT) != SHDocVw.OLECMDF.OLECMDF_ENABLED)
                        Thread.Sleep(100);


                    ie.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINTPREVIEW, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DODEFAULT, ref missing, ref missing);

                    ie.ExecWB(SHDocVw.OLECMDID.OLECMDID_PRINT, SHDocVw.OLECMDEXECOPT.OLECMDEXECOPT_DONTPROMPTUSER, ref missing, ref missing);
                    while (!documentPrinted)
                        Thread.Sleep(100);

                    ie.DocumentComplete -= ie_DocumentComplete;
                    ie.PrintTemplateTeardown -= ie_PrintTemplateTeardown;
                    ie.Quit();
                }
            }
            catch { throw; }
            finally
            {
                myPrinters.SetDefaultPrinter(currDefault);
            }
        }

And the Com Exception is as below exactly while creating an object for internetexplorer.

[ERRORLOG] Retrieving the COM class factory for component with CLSID
{0002DF01-0000-0000-C000-000000000046} failed due to the following
error: 80080005 Server execution failed (Exception from HRESULT:
0x80080005 (CO_E_SERVER_EXEC_FAILURE)). : at
System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean
publicOnly, Boolean noCheck, Boolean& canBeCached,
RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) at
System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean
skipCheckThis, Boolean fillCache) at
System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly,
Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean
fillCache) at System.Activator.CreateInstance(Type type, Boolean
nonPublic) at System.Activator.CreateInstance(Type type)
[/ERRORLOG]

Moreover if i try to create an object as InternetExplorerMedium. then its working in 2008 but not in Win server 2003. I was very much clue less… Any help regarding will help a lot.

Regards,
Pavan N

Answer 1

Finally i changed my own logic itself. I observed lot of difference w.r.t IE. especially IE9. all the DCOM seetings will be different. so with the name InternetExplorer ie = new InternetExplorer (); you cant create any object. its not either related to permission or OS. its related to IE version. Above code works only upto IE8.