Can I use the word object from within a webservice?

Posted on 2008-10-23
Last Modified: 2008-11-03
I'm trying to do a proof of concept to see if I can do some very basic word automation from within a webservice.  The problem I have is that after I have created an instance of the Word Appliation I am unable to open any files.  The Document that I am trying to get is always null.  Any ideas whats wrong? Is what I'm trying to do even possible?

In my code below you'll see that all I'm trying to do is create an instance of word (which succeeds), and then open the document (which fails and gives me a null reference). (The doc.Activate is only to cause an the null reference error)
private void PrintDocument(string safeFileName)
	Microsoft.Office.Interop.Word.Application app = new Microsoft.Office.Interop.Word.Application();
	// Open Doc
	object filename = safeFileName;
	Microsoft.Office.Interop.Word.Document doc = app.Documents.OpenNoRepairDialog(ref filename, ref _missing, ref _missing, ref _missing, ref _missing, ref _missing, ref _missing,
																											ref _missing, ref _missing, ref _missing, ref _missing, ref _missing, ref _missing, ref _missing,
																											ref _missing, ref _missing);
	doc.Activate(); // fails here because doc == null
	app.Quit(ref _missing, ref _missing, ref _missing);

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Question by:guxiyou
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Expert Comment

by:Éric Moreau
ID: 22794712
Using Office automation from on web server is a really bad idea. try the trial version of

Author Comment

ID: 22796352
Hmm, I'll give Aspose a try.  Why is running office automation from a web server such a bad idea? The service will only be used on a local LAN and for processing after hours.
LVL 70

Accepted Solution

Éric Moreau earned 500 total points
ID: 22796377

Although such programmatic development can be implemented on a client system with relative ease, a number of complications can occur if Automation takes place from server-side code such as Microsoft Active Server Pages (ASP), ASP.NET, DCOM, or a Windows NT service.
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Author Comment

ID: 22797311
I gave Aspose a try.  Unfortunately I found that Aspose did not preserve the formatting very well, and that the print quality of the documents wasn't very good.  Do you have any other suggestions of third-party tools that might be helpful?

Author Comment

ID: 22797331
One big requirement I we have is that the documents we produce with this tool need to work well with Word and look professional.  If we lose formatting every time we move back and forth that isn't going to work very well ;)
LVL 70

Expert Comment

by:Éric Moreau
ID: 22797397
I am using Aspose and just about everything that is available in Word is available in their tool.

If you find features that are missing, you can ask in their forum. They have added a couple of features for me in the .Cells product. They are very responsive.

Author Comment

ID: 22797422
Have you found that the documents you've manipulated using Aspose look the same as their Word counterparts? The quick test that I did seemed to indicate that spacing wasn't preserved very well.
LVL 70

Expert Comment

by:Éric Moreau
ID: 22797501
I have played only with Excel and PDF documents.

Even if you are only playing with the trial, post a question on their forum and you will get your problem solved.

Author Comment

ID: 22867621
I've tried Aspose, but there still seems to be a problem when trying to print from within a webservice. I'll keep trying, but I guess you've really answered my question already. Thanks

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