NullReferenceException after inserting Image in Header

[scaulfield]

Hi,

I seem to be having an issue with the BrowserTextControl (version 15.1), when I add an image to the header or footer, I get a null refernece exception originating from the txkernel.

If I change the code to deactivate the header after inserting the image an exception is not thrown. However, if I reactivate the header then the same exception is thrown.

The stack trace does not give any particularly useful information (I have included a screenshot as an attachment).

Here is my code:

private void tsbAddImage_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = browserTextControl1.Images.ImportFilters;
            DialogResult result = openFileDialog1.ShowDialog();

            if (result == DialogResult.OK)
            {
                TXTextControl.Image img = new TXTextControl.Image(openFileDialog1.FileName, openFileDialog1.FilterIndex);
                img.ExportFilterIndex = openFileDialog1.FilterIndex;
                img.SaveMode = ImageSaveMode.SaveAsData;

                if (activePagePart == ActivePart.HEADER)
                {
                    HeaderFooter hf = browserTextControl1.HeadersAndFooters.GetItem(HeaderFooterType.Header);
                    hf.Images.Add(img, -1);
                    hf.Deactivate();
                }
                else if (activePagePart == ActivePart.FOOTER)
                {
                    HeaderFooter hf = browserTextControl1.HeadersAndFooters.GetItem(HeaderFooterType.Footer);
                    hf.Images.Add(img, -1);
                    hf.Deactivate();
                }
                else
                {
                    browserTextControl1.Images.Add(img, -1);
                }
                
            }
        }

Thanks for any help

[Gunnar Giffey]

Hello there,
Although you are using version 15.1, you do not seem to use sections, which have to be used to access header and footers:
http://www.textcontrol.com/en_US/sup...ories.page.htm
Not sure if that is the cause for your exception as I can not run your code (what is activePagePart?).
If you supply simpler code or a working sample, I will gladly take a look at your issue.

[scaulfield]

Hi,

Just as a general point, is there any special approach which needs to be taken to insert an image into a header (assuming that the header is active and the image is being inserted at the current text position).

I am using code along the lines of:

    browserTextControl1.Images.Add(img, -1);

Which I was assuming would detect the current input position and insert an image into the correct collection, or am I wrong about this.

Thanks

Stephen

[scaulfield]

I have made a very simple example for investigation:

Created in VS2008 with .NET v2.0

Designer Code:

Standard TXControl Setup (ButtonBar, Rulers, StatusBar) with one
ToolStripContainer, containing one ToolstripButton called tsbAddImage.
tsbAddImage has a Click event handler tsbAddImage_Click.

The form uses the code below:

namespace WordProcessor
{
    public partial class BrowserAppControl : UserControl
    {
        public BrowserAppControl()
        {
            InitializeComponent();
            browserTextControl1.ButtonBar = browserButtonBar1;
            browserTextControl1.RulerBar = browserRulerBar1;
            browserTextControl1.VerticalRulerBar = browserRulerBar2;
            browserTextControl1.StatusBar = browserStatusBar1;
            browserTextControl1.ViewMode = TXTextControl.ViewMode.PageView;
            browserTextControl1.CreateControl();
        }

        private void tsbAddImage_Click(object sender, EventArgs e)
        {
            HeaderFooter header = null;
            if (browserTextControl1.Sections.GetItem().HeadersAndFooters.GetItem(HeaderFooterType.Header) != null)
            {
                header = browserTextControl1.Sections.GetItem().HeadersAndFooters.GetItem(HeaderFooterType.Header);
            }
            else
            {
                browserTextControl1.Sections.GetItem().HeadersAndFooters.Add(HeaderFooterType.Header);
                header = browserTextControl1.Sections.GetItem().HeadersAndFooters.GetItem(HeaderFooterType.Header);

            }
            header.Activate();
            browserTextControl1.HeaderFooterActivationStyle = HeaderFooterActivationStyle.ActivateClick;
            browserTextControl1.HeaderFooterFrameStyle = HeaderFooterFrameStyle.DottedFrame;

            TXTextControl.Image img = new TXTextControl.Image();
            header.Images.Add(img, -1);
               

        }
    }
}

Thanks for the help

Cheers

Stephen

[Gunnar Giffey]

Hello Stephen,
Thanks your for your reply.
Could you please attach the full project, so I can run that here to debug it?
You can simply attach it to your post if you zip up the project folder.
Thanks.

[scaulfield]

Hi Gunnar,

Please find attached an example project.

I have removed all of the standard TXControl dlls and associated files from the BrowserBin directory to minimize the file size

Thanks

Stephen

[Gunnar Giffey]

Stephen,
I can run and insert an image using your sample project without any exception.
Are you able to reproduce the error on your development machine or client PC?