public static bool CreateSingleInstance(EventHandler <DataReceivedEventArgs> handler, string data)
{
bool isFirstInstance = true;
try
{
var eventHandle = SharedMemoryCommon.CreateOrOpenEventHandle(out isFirstInstance);
if (isFirstInstance)
{
IIpcServer server = new SharedMemoryServer(eventHandle);
server.Received += handler;
server.Start();
// Register process exit handler to stop the server
Process process = Process.GetCurrentProcess();
process.Exited += (s, e) =>
{
log.Info("Closing interprocess communication server");
try { server.Dispose(); }
catch (Exception ex) { log.Error("Error closing interprocess communication server", ex); }
};
}
else
{
using (IIpcClient client = new SharedMemoryClient(eventHandle)) client.Send(data);
}
}
catch (Exception ex) { log.Error("Error creating single instance of application", ex); }
return(isFirstInstance);
}
public void Send(string data)
{
using (var memFile = SharedMemoryCommon.CreateOrOpenMemoryMappedFile())
using (var memView = memFile.CreateViewAccessor())
{
var bytes = Encoding.Default.GetBytes(data);
memView.Write(SharedMemoryCommon.DataLengthPosition, bytes.Length);
memView.WriteArray(SharedMemoryCommon.DataPosition, bytes, 0, bytes.Length);
_dataAvailable.Set();
}
}
public void Start()
{
Task.Factory.StartNew(() =>
{
using (var memFile = SharedMemoryCommon.CreateOrOpenMemoryMappedFile())
using (var memView = memFile.CreateViewAccessor())
{
// Continue waiting and looping while data available satisfied the wait; stop looping when killer event is set
while (WaitHandle.WaitAny(new WaitHandle[] { _killer, _dataAvailable }) == 1)
{
int length = memView.ReadInt32(SharedMemoryCommon.DataLengthPosition);
var data = new byte[length];
memView.ReadArray(SharedMemoryCommon.DataPosition, data, 0, length);
OnReceived(new DataReceivedEventArgs(Encoding.Default.GetString(data)));
}
}
});
}