C#：如何打开配置 Pin 对话框？

Question

我想知道

 System.Diagnostics.Process.Start("", "");

打开此对话框时要运行什么进程。谢谢 该对话框来自MS Expression编码器的直播项目，所选设备的配置引脚对话框。

Answer 1

此对话框不是一个单独的可执行文件，您可以使用 System.Diagnostics.Process.Start 运行它。这是捕获设备的配置对话框。您的捕获设备表示为 DirectShow 捕获设备。此设备是一个 COM 对象，它实现 ISpecifyPropertyPages，这是您正在查看的特定屏幕的来源。 这里是一篇有关如何显示的 MSDN 文章DirectShow 过滤器的属性页。

Answer 2

如果您使用的是 Expression Encoder SDK 4，则可以显示此对话框和其他配置窗口，如下所示：

 LiveDeviceSource _deviceSource;   
 ....
 if (_deviceSource.IsDialogSupported(ConfigurationDialog.VideoCapturePinDialog))
 {              
       _deviceSource.ShowConfigurationDialog(ConfigurationDialog.VideoCapturePinDialog, (new HandleRef(panelVideoPreview, panelVideoPreview.Handle)));
 }

您可以通过探索 Microsoft.Expression.Encoder.Live.ConfigurationDialog 类型来查看支持的所有配置对话框。

Answer 3

没有任何程序可以使用该行运行来打开该对话框。 （当然，除非你自己做了一个。）

Answer 4

使用 Expression Encoder SDK 中的 LiveDeviceSource.ShowConfigurationDialog 函数通常是一个不错的选择。然而，就我而言，我有一些捕获源，如果配置错误，则无法由表达式编码器正确实例化。为了正确配置它们，我需要它们的配置对话框。因此，我使用 DirectShow.NET 整合了这个解决方案：

/// <summary>
/// Retrieves the IBaseFilter with the requested name
/// </summary>
/// <param name="deviceName">The friendly name of the device to retrieve</param>
/// <param name="deviceType">The type of device to retrieve</param>
/// <returns>Returns the filter with the given friendly name, or null if no such filter exists</returns>
public static IBaseFilter GetDeviceFilterByName(string deviceName, EncoderDeviceType deviceType)
{
    int hr = 0;
    IEnumMoniker classEnum = null;
    IMoniker[] moniker = new IMoniker[1];

    // Create the system device enumerator
    ICreateDevEnum devEnum = (ICreateDevEnum)new CreateDevEnum();

    // Create an enumerator for the video or audio capture devices
    if (deviceType == EncoderDeviceType.Audio)
    {
        hr = devEnum.CreateClassEnumerator(FilterCategory.AudioInputDevice, out classEnum, 0);
    } else
    {
        hr = devEnum.CreateClassEnumerator(FilterCategory.VideoInputDevice, out classEnum, 0);
    }

    DsError.ThrowExceptionForHR(hr);
    Marshal.ReleaseComObject(devEnum);

    // no enumerators for video/audio input devices
    if (classEnum == null)
    {
        return null;
    }

    IBaseFilter foundFilter = null;
    // enumerate all input devices, looking for one with the desired friendly name
    while(classEnum.Next(moniker.Length, moniker, IntPtr.Zero) == 0)
    {
        Guid iid = typeof(IPropertyBag).GUID;
        object props;
        moniker[0].BindToStorage(null, null, ref iid, out props);
        object currentName;
        (props as IPropertyBag).Read("FriendlyName", out currentName, null);

        if ((string)currentName == deviceName)
        {
            object filter;
            iid = typeof(IBaseFilter).GUID;
            moniker[0].BindToObject(null, null, ref iid, out filter);
            foundFilter = (IBaseFilter)filter;

            Marshal.ReleaseComObject(moniker[0]);
            break;
        }
        Marshal.ReleaseComObject(moniker[0]);
    }

    Marshal.ReleaseComObject(classEnum);
    return foundFilter;
}

/// <summary>
/// Opens the property pages for the filter with the given name
/// </summary>
/// <param name="filter">The filter for which we wish to retrieve and open the property pages</param>
public static void ShowDevicePropertyPages(IBaseFilter filter, IntPtr handle)
{
    // get the ISpecifyPropertyPages for the filter
    ISpecifyPropertyPages pProp = filter as ISpecifyPropertyPages;
    int hr = 0;
    if (pProp == null)
    {
        // if the filter doesn't implement ISpecifyPropertyPages, try displaying IAMVfwCompressDialogs instead
        IAMVfwCompressDialogs compressDialog = filter 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 = filter.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 = new[] {(object)filter};
    hr = OleCreatePropertyFrame(handle, 0, 0, filterInfo.achName, 1, oDevice,
                                caGUID.cElems, caGUID.ToGuidArray(), 0, 0, 0);
    DsError.ThrowExceptionForHR(hr);

    // release COM objects
    Marshal.FreeCoTaskMem(caGUID.pElems);
    Marshal.ReleaseComObject(pProp);
    if (filterInfo.pGraph != null)
    {
        Marshal.ReleaseComObject(filterInfo.pGraph);
    }
}

[DllImport("oleaut32.dll", CharSet = CharSet.Unicode, ExactSpelling = true)]
static extern int OleCreatePropertyFrame(IntPtr hwndOwner,
    int x,
    int y,
    [MarshalAs(UnmanagedType.LPWStr)] string lpszCaption,
    int cObjects,
    [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 4, ArraySubType = UnmanagedType.IUnknown)] object[] lplpUnk,
    int cPages,
    [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 6)] Guid[] lpPageClsID,
    int lcid,
    int dwReserved,
    int lpvReserved);

用法：

var device = GetDeviceFilterByName(_settingsViewModel.VideoEncoderDevice.Name, EncoderDeviceType.Video);
ShowDevicePropertyPages(device, new HandleRef(ConfigurationDialogHost, 
                    ConfigurationDialogHost.Handle).Handle);