C# : How to use directshow.net to show this dialog?

问题

How to call this dialog using Directshow.net?

Filter graph

回答1:

Something like this would work, assuming you have an IBaseFilter reference:

[DllImport("oleaut32.dll", CharSet = CharSet.Auto)]
    internal static extern int OleCreatePropertyFrame(
        IntPtr hwndOwner,
        uint x, uint y,
        [MarshalAs(UnmanagedType.LPWStr)]
        string caption,
        uint objectCount,
        [MarshalAs(UnmanagedType.LPArray, ArraySubType = UnmanagedType.IUnknown)]
        object[] lplpUnk,
        int cPages,
        IntPtr pageClsID,
        Guid lcid,
        uint dwReserved,
        IntPtr lpvReserved);

    public void DisplayPropertyPages(Form form, IBaseFilter filter)
    {
            var propertyPages = filter as ISpecifyPropertyPages;
            DsCAUUID pages;
            FilterInfo info;
            int hr = filter.QueryFilterInfo(out info);
            DsError.ThrowExceptionForHR(hr);
            if (propertyPages == null)
            {
                throw new ApplicationException("IBaseFilter doesn't implement ISpecifyPropertyPages");
            }
            hr = propertyPages.GetPages(out pages);
            DsError.ThrowExceptionForHR(hr);
            var filters = new IBaseFilter[1];
            filters[0] = filter;
            hr = OleCreatePropertyFrame(form.Handle, 0, 0, info.achName, 1, filters,
                pages.cElems, pages.pElems, Guid.Empty, 0, IntPtr.Zero);
            Marshal.FreeCoTaskMem(pages.pElems);
            DsError.ThrowExceptionForHR(hr);
    }

回答2:

Please, check description of OleCreatePropertyFrame() in MSDN.

Guid lcid is invalid. Result: Managed Debugging Assistant 'PInvokeStackImbalance' has detected a problem in 'D:\CVS\Dev\Filters\H264\H264mfxEncoder\Samples\C#\H264EncoderTest\bin\Debug\H264EncoderTest.vshost.exe'. Additional Information: A call to PInvoke function 'H264EncoderTest!H264EncoderTest.CGraph::OleCreatePropertyFrame' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature.

Must be: uint lcid and hr = OleCreatePropertyFrame(form.Handle, 0, 0, info.achName, 1, filters, pages.cElems, pages.pElems, 0, 0, IntPtr.Zero);

来源：https://stackoverflow.com/questions/4754971/c-sharp-how-to-use-directshow-net-to-show-this-dialog

标签

filter

dialog

directshow.net