Issue with merging of PPT slides in .Net using Aspose.Slides

Aspose.Slides Product Family
1

Hi,

We have an issue while merging of individual PPT slides in .Net (Framewrok 2.0) using Aspose.Slides. Individual reports are being generated properly from SSRS 2005 by using the DLL Aspose.Slides.ReportingServices.dll(Version 2.1.1.0). But while merging we see the below issue -

Object reference not set to an instance of an object.

However, this issue is not occuring consistently.

Please let us know the solution to the above problem.

The version of the Aspose.Slides DLL which we have used is 2.9.0.0.

Thanks,

Sridevi

2

Hi Sridevi,

This message appears when you try to merge a slide that does not exist in the individual presentation. It can be avoided using the statement like this:

for(int i=1;i<=pres.Slides.Count;i++)

{

presMerge.CloneSlide(pres.GetSlideByPosition(i),presMerge.Slides.Count);

}

3

Hi,

Thanks for the reply.

But, we have found that we are getting the exception in the below line while merging the individual PPTs -

if (pre1.SlideSize.Width < pre.SlideSize.Width || 
    pre1.SlideSize.Height < pre.SlideSize.Height)
{
    pre1.SlideSize = pre.SlideSize;
}

The exception is being thrown when the values are as follows -

pre1.SlideSize.Width = 6336
pre.SlideSize.Width = 6336
pre1.SlideSize.Height = 4320
pre.SlideSize.Height = 4896

This exception is occuring in the third iteration for the above values. For the first two iterations, we are not getting exception, the values are as follows -

1st iteration -

pre1.SlideSize.Width = 5760
pre.SlideSize.Width = 6336
pre1.SlideSize.Height = 4320
pre.SlideSize.Height = 4320

2nd iteration -

pre1.SlideSize.Width = 6336
pre.SlideSize.Width = 5760
pre1.SlideSize.Height = 4320
pre.SlideSize.Height = 4320

The following is the piece of code which we are using for the merging purpose -

//Variable declarations
int x = 2;
Presentation pre;
FileStream fis1 = null;
string[] objSortedFiles = Directory.GetFiles(@"C:\source\ppts\input");
Presentation pre1 = new Presentation();

foreach (string objFileName in objSortedFiles)
{
    fis1 = new System.IO.FileStream(objFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read);
    pre = new Presentation(fis1);

    if (pre1.SlideSize.Width < pre.SlideSize.Width &&
        pre1.SlideSize.Height < pre.SlideSize.Height)
    {
        pre1.SlideSize = pre.SlideSize;
    }

    SortedList lst = new SortedList();
    for (int i = 1; i <= pre.Slides.LastSlidePosition; i++)
    {
        Slide si = pre.GetSlideByPosition(i);
        pre.CloneSlide(si, x, pre1, lst);
        x++;
    }
}

pre1.Slides.Remove(pre1.GetSlideByPosition(1));

pre1.Write(@"C:\source\ppts\output\merged.ppt");

Please let me know the solution for this issue.

Thanks,
Sridevi

4

Hi Sridevi,

I have tested the statement

pre1.SlideSize = pre.SlideSize;

pointed out by you with the following values:

pre1.SlideSize.Width = 6336

pre.SlideSize.Width = 6336

pre1.SlideSize.Height = 4320

pre.SlideSize.Height = 4896

However, no exception thrown.

I think, it would be better, if you provide the effected folder for proper investigation.