/// <summary>
/// Finds the matching process and volume control
/// </summary>
/// <param name="processName">The name of the process to find</param>
/// <param name="selectedProcess">The selected process</param>
/// <param name="volumeControl">The volume control object</param>
private static void FindMatchingProcess(string processName, out Process selectedProcess, out ISimpleAudioVolume volumeControl)
{
selectedProcess = null;
volumeControl = null;
// First find the list of matching processes
Process[] matchingProcesses = Process.GetProcessesByName(processName);
if (matchingProcesses != null && matchingProcesses.Length > 0)
{
// Attempt to see if we can find an audio session with the same Process ID as one we have found
IMMDeviceEnumerator deviceEnumerator = null;
IMMDevice device = null;
IAudioSessionManager2 sessionManager = null;
IAudioSessionEnumerator sessionEnumerator = null;
object activatedObject = null;
Guid sessionManagerGuid = typeof(IAudioSessionManager2).GUID;
try
{
// Create the Device Enumerator
deviceEnumerator = (IMMDeviceEnumerator)(new MMDeviceEnumerator());
// Get the default audio device
if (deviceEnumerator != null)
{
deviceEnumerator.GetDefaultAudioEndpoint(DataFlow.Render, Role.Multimedia, out device);
}
// Get the Session Manager
if (device != null)
{
device.Activate(ref sessionManagerGuid, (uint)0, IntPtr.Zero, out activatedObject);
sessionManager = activatedObject as IAudioSessionManager2;
activatedObject = null;
}
// Get the Session Enumerator
if (sessionManager != null)
{
sessionManager.GetSessionEnumerator(out sessionEnumerator);
}
// Look through the list of Sessions and find one with a matching process ID.
if (sessionEnumerator != null)
{
int totalSessions = 0;
sessionEnumerator.GetCount(out totalSessions);
for (int currentSession = 0; currentSession < totalSessions; currentSession++)
{
IAudioSessionControl currentSessionControl = null;
sessionEnumerator.GetSession(currentSession, out currentSessionControl);
IAudioSessionControl2 currentSessionControl2 = currentSessionControl as IAudioSessionControl2;
if (currentSessionControl2 != null)
{
uint processID = 0;
currentSessionControl2.GetProcessID(out processID);
foreach (Process currentProcess in matchingProcesses)
{
// We found the correct process and audio session
if (currentProcess.Id == processID)
{
selectedProcess = currentProcess;
volumeControl = currentSessionControl as ISimpleAudioVolume;
break;
}
}
}
if (selectedProcess != null)
{
// We found the volume control
break;
}
else
{
// Free the current session
Marshal.ReleaseComObject(currentSessionControl);
}
}
}
}
finally
{
// Clean up the COM Objects that we used
if (activatedObject != null)
{
Marshal.ReleaseComObject(activatedObject);
}
if (sessionEnumerator != null)
{
Marshal.ReleaseComObject(sessionEnumerator);
}
if (sessionManager != null)
{
Marshal.ReleaseComObject(sessionManager);
}
if (device != null)
{
Marshal.ReleaseComObject(device);
}
if (deviceEnumerator != null)
{
Marshal.ReleaseComObject(deviceEnumerator);
}
}
// If we get here for some reason and don't have a matching process then we will just take the first one with a valid Window Handle
if (selectedProcess == null)
{
foreach (Process currentProcess in matchingProcesses)
{
if (currentProcess != null && currentProcess.MainWindowHandle != IntPtr.Zero)
{
selectedProcess = currentProcess;
break;
}
}
}
}
}
