Why I got this excepion 'COMException' after running few times ??

Question

This is my function.

I got COMException at this line.

application.ActiveWindow.Selection.Paste();

When I use this function only once , there is no problem.

But I use this function by loop(the input parameter is always different) ,I got the exception after run this function more than twice .

The exception isn`t happened at certain tims.

Sometimes it occurred at second times ,sometimes it occurred at third times.

It`s seems that the application have not got the controlled permissions with the word files.

How can I solve it ?

Any reply would be appreciate.

Thank you!

private void addTxt(string from, string to)
{
    object missing = System.Reflection.Missing.Value;
    object oTrue = true;
    object oFormat = WdOpenFormat.wdOpenFormatText;
    var application = new Application();
    var document = application.Documents.Open(from, missing, oTrue, missing, missing, missing, missing, missing, missing, oFormat);

    var document2 = application.Documents.Open(to);

    document.Content.Copy();

    document2.Content.Select();

    Object objUnit = WdUnits.wdStory;

    application.Selection.EndKey(ref objUnit, ref missing);

    application.ActiveWindow.Selection.Paste();

    document2.Save();

    document.Close();

    document2.Close();

    application.Quit();

}

Answer 1

Hi 哇哩勒,

Thanks for posting in the MSDN forum.

Would you please clarify your Office version?

And please show me the loop circle's snippet for further research.

Have a good day,

Tom

---

Tom Xu [MSFT]
MSDN Community Support | Feedback to us

Answer 2

The version of the .dll is Office12.

My program read a text file ,the file has a lot of filename in it.

like

A001.TXT A002.TXT A003.TXT ......

I want read these files and paste the context to a word file.

The snippet is as below.

Thank you!

string file[];//this is read from file

for(int i=0;i<file.Length;++i)
    addText(file[i],file[i]+".docx");

Answer 3

Hi All,

what Document is the ActiveWindow?

Does it have the Focus? Is a Document active, do the files exists?

In the Loop you always create a new Instance of Word.Application() ? -> create the instance outside and pass it to the AddText function.

I would integrate Exception-Handling, do a try/catch and maybe a Debugger.Launch() statement, then you can see where the error is.

The files are just .txt files, no docx files. Would it not be simpler to do the string contenation using a simple Text Filereader/writer ?

Greets - Helmut

---

Helmut Obertanner [http://www.obertanner.de] [http://www.outlooksharp.de]

Answer 4

ActiveWindow is "document2" ,and I'm sure that the file is exist .

I change the application to outside but the problem is still happen.

The Exception is
An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred in wordTest.dll

Additional information: Command Fails

The error sometimes happened at Paste() sometimes at Save()

I use this function not only deal txt files but doc or docx files.

And it's very slow if I use this COM object to write , copy and paste would faster.

Thanks for the reply.

Answer 5

Hi,

I would try to attach the Debugger, Enable all Exceptions and then have a Look at the Inner Exception.
The COM Exception normally has a number associated.

Then you can try to find the "Human readable" Error Message by that Number.

Do a try/catch and catch the System.COMException (not System.Exception)

Then see what's in the Message Text

http://msdn.microsoft.com/en-us/library/9ztbc5s1.aspx

Also you can search the Internet by the COM Errornumber to find out what's causing the Problem.

Hope that helps.

Greets - Helmut

---

Helmut Obertanner [http://www.obertanner.de] [http://www.outlooksharp.de]

Answer 6

Hi 哇哩勒,

Do you use try/catch to get more information of your issue? I will mark Helmut's reply. It's based on my experience that his suggestion will help you. If you feel it dosn't help you, please feel free to unmark it.

Have a good day,

Tom

---

Tom Xu [MSFT]
MSDN Community Support | Feedback to us