I'm using aspose.cells to add an image to the background of each page of an excel document to represent a watermark of sorts. The problem I seem to be having is that when I save the document the mime type is not set properly. The code I am using is below:
When I then save the file to my desktop and open with excel it tells me the file is not an excel file. The mimetype appears to be application/octet-stream??
I am not sure about your code (especially regarding saving
the excel file), I think you may save the file directly to disk (e.g
workbook.Save(“f:\test\outputfile.xls”, FileFormatType.Excel2003)
or use my updated code. I have tried it and it works fine.
Sample code: Workbook workbook = new Workbook(); workbook.Open(“f:\test\MyFile.xls”); FileStream watermarkStream = File.OpenRead(“f:\test\school.jpg”); byte[] imageData = new byte[watermarkStream.Length]; watermarkStream.Read(imageData, 0, imageData.Length); for (int i = 0; i < workbook.Worksheets.Count; i++) {