private HResult UpdateDeviceList()
{
// Remove any previous list
cbDeviceList.Items.Clear();
cbDeviceList.Text = "";
// Query MF for the devices
MFDevice [] arDevices = MFDevice.GetDevicesOfCat(CLSID.MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE_VIDCAP_GUID);
// Walk the list
cbDeviceList.BeginUpdate();
for (int iDevice = 0; iDevice < arDevices.Length; iDevice++)
{
// Add it to the combo box
cbDeviceList.Items.Add(arDevices[iDevice]);
}
cbDeviceList.EndUpdate();
// If there's at least 1 item
if (cbDeviceList.Items.Count > 0)
{
// Select the first item.
cbDeviceList.SelectedIndex = 0;
}
return(0);
}
/// <summary>
/// Returns an array of DsDevices of type devcat.
/// </summary>
/// <param name="cat">Any one of FilterCategory</param>
public static MFDevice[] GetDevicesOfCat(Guid FilterCategory)
{
// Use arrayList to build the retun list since it is easily resizable
MFDevice[] devret = null;
IMFActivate[] ppDevices;
//////////
HResult hr = 0;
IMFAttributes pAttributes = null;
// Initialize an attribute store. We will use this to
// specify the enumeration parameters.
hr = MFExtern.MFCreateAttributes(out pAttributes, 1);
// Ask for source type = video capture devices
if (hr >= 0)
{
hr = pAttributes.SetGUID(
MFAttributesClsid.MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE,
FilterCategory
);
}
// Enumerate devices.
int cDevices;
if (hr >= 0)
{
hr = MFExtern.MFEnumDeviceSources(pAttributes, out ppDevices, out cDevices);
if (hr >= 0)
{
devret = new MFDevice[cDevices];
for (int x = 0; x < cDevices; x++)
{
devret[x] = new MFDevice(ppDevices[x]);
}
}
}
if (pAttributes != null)
{
Marshal.ReleaseComObject(pAttributes);
}
return(devret);
}
private HResult GetSelectedDevice(out IMFActivate ppActivate)
{
// First get the index of the selected item in the combo box.
int iListIndex = cbDeviceList.SelectedIndex;
if (iListIndex < 0)
{
ppActivate = null;
return(HResult.E_FAIL);
}
// Parse out the IMFActivate
MFDevice di = cbDeviceList.SelectedItem as MFDevice;
ppActivate = di.Activator;
return(0);
}
/// <summary>
/// Returns an array of DsDevices of type devcat.
/// </summary>
/// <param name="cat">Any one of FilterCategory</param>
public static MFDevice[] GetDevicesOfCat(Guid FilterCategory)
{
// Use arrayList to build the retun list since it is easily resizable
MFDevice[] devret = null;
IMFActivate[] ppDevices;
//////////
int hr = 0;
IMFAttributes pAttributes = null;
// Initialize an attribute store. We will use this to
// specify the enumeration parameters.
hr = MFExtern.MFCreateAttributes(out pAttributes, 1);
// Ask for source type = video capture devices
if (hr >= 0)
{
hr = pAttributes.SetGUID(
MFAttributesClsid.MF_DEVSOURCE_ATTRIBUTE_SOURCE_TYPE,
FilterCategory
);
}
// Enumerate devices.
int cDevices;
if (hr >= 0)
{
hr = MFExtern.MFEnumDeviceSources(pAttributes, out ppDevices, out cDevices);
if (hr >= 0)
{
devret = new MFDevice[cDevices];
for (int x = 0; x < cDevices; x++)
{
devret[x] = new MFDevice(ppDevices[x]);
}
}
}
if (pAttributes != null)
{
Marshal.ReleaseComObject(pAttributes);
}
return devret;
}
