QueryInterface for interface Excel._Application failed.

[kowshik]

We are using Excel 11.0 library in one of my c# project. We instantiate the
excel objects in the c# code and creating excel file on the server side. The
code is working fine on the local machine but it is failing on the dev
machine with the following description. Both machines are having excel 2003
installed.

The QueryInterface for interface Excel._Application failed.

I am sending the the excel code to this mail which causes this problem. I am
confused why this problem occurs. Please reply me in details.

The code as follows:

Excel.Application exlApplication = null;
Excel.Workbooks exlWorkBooks = null;
Excel._Workbook exlWorkBook = null;

// Create the Excel application object
exlApplication = new Application();
exlWorkBooks = exlApplication.Workbooks;

exlWorkBook =
exlWorkBooks.Open(strXMLPath,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing);

exlWorkBook.SaveAs(strEXLPath,XlFileFormat.xlWorkbookNormal,Type.Missing,Type.Missing,Type.Missing,Type.Missing,XlSaveAsAccessMode.xlExclusive,Type.Missing,Type.Missing,Type.Missing,Type.Missing,Type.Missing);


exlWorkBook.Close(null,null,null);
exlApplication.Workbooks.Close();

exlApplication.Quit();



System.Runtime.InteropServices.Marshal.ReleaseComObject (exlWorkBooks);

System.Runtime.InteropServices.Marshal.ReleaseComObject (exlWorkBook);

System.Runtime.InteropServices.Marshal.ReleaseComObject (exlApplication);

exlWorkBook = null;
exlApplication = null;
exlWorkBooks = null;

Waiting for your response....

Thanks & Regards
Kowshik.

 

[Simon Murphy]

Kowshik
Try:
Excel.Application xlApp = new Excel.Application();
Excel.Workbook wb;
wb = xlApp.workbooks.open(.....);

wb.saveAs(...);

I dont think you need your exlworkbooks object

If this doesn't work i have working code that uses the ApplicationClass
instead of Application

cheers
Simon

 

[kowshik]

Hi Simon Murphy:

Thanks for your sugestions.
Please send me the code which you are having that uses Application Class
instead of Application.

Waiting for your reply,
Thanks & Regards,
koushik