Using AxImaging and AxViewer objects on different forms

[mreynold]

I have the AxImaging object on my main form, but the AxViewer object I put on a sub-form, in order to speed up the scanning. The Form_Load handler does not run instantly, it runs only after a delay, which can be substantial on very slow machines. So I call the following code from a thread spawned from the main form in order to avoid this delay:

Code: Select all

        While AxImaging1.CreateImageFromTwain <> 0
            nPageCount += 1
            AxImaging1.ConvertTo8BppQ()
            nAcquiredImage = AxImaging1.GetNativeImage
            If nPageCount = 1 Then
                m_nTiffMultipage = AxImaging1.TiffCreateMultiPageFromGdPictureImage(nAcquiredImage)
                m_dlgViewer.m_nTiffMultipage = m_nTiffMultipage
            Else
                AxImaging1.TiffAppendPageFromGdPictureImage(m_nTiffMultipage, nAcquiredImage)
            End If
            m_dlgViewer.AxGdViewer1.SetNativeImage(m_nTiffMultipage)
            m_dlgViewer.AxGdViewer1.DisplayLastFrame()
            AxImaging1.CloseImage(nAcquiredImage)
        End While


This was previously working, but with the latest revision any call to m_dlgViewer.AxGdViewer1 bombs with the error, "Invalid image: Can not get picture height." Is there a problem with getting these two objects to communicate across different forms?

[Loïc]

Hi,

I can't reproduce this problem.

Could you send me a tiny application which shows this error ?

Also, check you are using the same GdPicture library for your Imaging & GdViewer objects.

Best regards,

Loïc Carrère

[mreynold]

You are correct, there was some kind of error in the Visual Studio project. When I pulled the GdPicture references and form objects and reinserted them, everything started working as normal again.

Thank you!