Microsoft.Office.Interop error 0x800401E3

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I am trying to access Microsoft word instance through my service but I am getting this error
Operation unavailable (Exception from HRESULT: 0x800401E3 (MK_E_UNAVAILABLE)) ,
I have opened word document ( i can also see WINWORD.EXE in Task Manager) ,
I am using VS 2010 and MS Office 2003. Here is my code

VB

Dim fs As New FileStream("D:\log.txt", FileMode.OpenOrCreate, FileAccess.Write)
        Dim sw As New StreamWriter(fs)
        sw.BaseStream.Seek(0, SeekOrigin.End)
        Dim wordapp As Word.Application
        wordapp = Marshal.GetActiveObject("Word.Application")
        For Each doc As Word.Document In wordapp.Documents
            sw.WriteLine(doc.FullName.ToString() + "\n" +
            doc.ActiveWindow.WindowState.ToString())
        Next
        sw.Flush()
        sw.Close()

if i use this code in windows form application it works perfect, but doesn’t works in windows service.Why is that for ? Windows Service Doesn’t support Microsoft.Office.Interop ? If it does work please guide.

Posted 21-Feb-13 23:58pm

muneebalikiyani

Updated 18-Apr-18 19:47pm

v3

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Comments

ArunAmalraj 22-Feb-13 6:07am

Hello muneebalikiyani,

Check for User Rights.

It will not work if...Your application is running as administrator and WINWORD with normal user rights.

muneebalikiyani 22-Feb-13 6:24am

thanks , but what can i do to make it work

2 solutions

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Bernhard Hiller · Answer 1 · 2013-02-22T02:31:00

Solution 1

Run your service with your credentials - otherwise it won't be able to access Word running with your credentials.

Posted 22-Feb-13 2:31am

Bernhard Hiller

Comments

fjdiewornncalwe 22-Feb-13 9:37am

My 5.

muneebalikiyani 26-Feb-13 23:19pm

I have done that also , i think Marshall.getactiveobject() doesn't works for windows services, please correct me if i am wrong

Member 11615348 15-Apr-16 3:14am

Even I am getting the same error:
Operation unavailable (Exception from HRESULT: 0x800401E3 (MK_E_UNAVAILABLE))

I am using VS 2015. Can anybody help on this?

pawan2261872 25-Jan-18 5:03am

Your visual syudio might be running in administrator mode.
Both visual studio and the fetching application(word) should be in same mode.

Member 13769719 · Answer 2 · 2018-04-18T19:48:00

Add reference only of "Microsoft.Office.Interop.Excel.dll"
try
        {
 //This requires excel app (excel.exe*32) to be running means any excel sheet should be open. If excel not running then it will throw error.
            excelApp = (Excel.Application)Marshal.GetActiveObject("Excel.Application");
            excelApp.Visible = false;
        }
        catch
        {
            //create new excel instance
            excelApp = new Excel.Application();
            excelApp.Visible = false;
        }
This worked for me.
Advantage: No need to copy Microsoft.Office.Interop.Excel.dll to your installed foler. Since MS excel is installed it will take from GAC.

I used Office.dll too but not sure if its really required.