Access DirectShow Filter Property Page? (1 Viewer)

[FlipGer]

Hi,

a question to DirectShow Gurus.

How do I access the property page of a direct show filter?

I know I can open it with:

page PropertyPage;
(?)
page.open();

But the interessting part is the (?). How do I access the page of the filter?

The only example code I found used the graphbuilder. Is this the only possibilty? Create a graph, add the filter and collect the PropertyPages?

And how can this easily be done? A short example would be nice.

Flip.

 

[CHli]

Are you using DirectShowNet Library ?

Edit : Anyway here is the included sample.

You can grab the IPropertyPages from the IBaseFilter no need to have a GraphBuilder.

//Some Interop !
//A (modified) definition of OleCreatePropertyFrame found here: http://groups.google.no/group/microsoft.public.dotnet.languages.csharp/browse_thread/thread/db794e9779144a46/55dbed2bab4cd772?lnk=st&q=[DllImport(%22olepro32.dll%22)]&rnum=1&hl=no#55dbed2bab4cd772
       [DllImport("olepro32.dll")]
       public static extern int OleCreatePropertyFrame(
           IntPtr hwndOwner,
           int x,
           int y,
           [MarshalAs(UnmanagedType.LPWStr)] string lpszCaption,
           int cObjects,
           [MarshalAs(UnmanagedType.Interface, ArraySubType=UnmanagedType.IUnknown)]
           ref object ppUnk,
           int cPages,
           IntPtr lpPageClsID,
           int lcid,
           int dwReserved,
           IntPtr lpvReserved); 


   /// <summary>
       /// Displays a property page for a filter
       /// </summary>
       /// <param name="dev">The filter for which to display a property page</param>
       private void DisplayPropertyPage(IBaseFilter dev)
       {
           //Get the ISpecifyPropertyPages for the filter
           ISpecifyPropertyPages pProp = dev as ISpecifyPropertyPages;
           int hr = 0;

           if (pProp == null)
           {
               //If the filter doesn't implement ISpecifyPropertyPages, try displaying IAMVfwCompressDialogs instead!
               IAMVfwCompressDialogs compressDialog = dev as IAMVfwCompressDialogs;
               if (compressDialog != null)
               {

                   hr = compressDialog.ShowDialog(VfwCompressDialogs.Config, IntPtr.Zero);
                   DsError.ThrowExceptionForHR(hr);
               }
               return;
           }

           //Get the name of the filter from the FilterInfo struct
           FilterInfo filterInfo;
           hr = dev.QueryFilterInfo(out filterInfo);
           DsError.ThrowExceptionForHR(hr);

           // Get the propertypages from the property bag
           DsCAUUID caGUID;
           hr = pProp.GetPages(out caGUID);
           DsError.ThrowExceptionForHR(hr);

           //Create and display the OlePropertyFrame
           object oDevice = (object)dev;
           hr = OleCreatePropertyFrame(this.Handle, 0, 0, filterInfo.achName, 1, ref oDevice, caGUID.cElems, caGUID.pElems, 0, 0, IntPtr.Zero);
           DsError.ThrowExceptionForHR(hr);

           // Release COM objects
           Marshal.FreeCoTaskMem(caGUID.pElems);
           Marshal.ReleaseComObject(pProp);
           Marshal.ReleaseComObject(filterInfo.pGraph);
       }

 

[FlipGer]

Hi,

thanks for the reply!
Will test it this evening.

And yes, I am using DirectShowNet (trying)...

Flip.

 

[CHli]

I have some code (by me) building manually a graph using a capture filter, a sample grabber and a null renderer if you are interested. (i'm getting the filter by their name)

Anyway PM me if you want more informations or if you're stuck.