public async Task <byte[]> CaptureImage(CaptureImageConfig parameters)
{
TaskCompletionSource <byte[]> tcs = new TaskCompletionSource <byte[]>();
this.m_logger.LogDebug("Called captureImage with {0}", parameters);
Tuple <CaptureImageConfig, TaskCompletionSource <byte[]> > state = new Tuple <CaptureImageConfig, TaskCompletionSource <byte[]> >(parameters, tcs);
ThreadPool.QueueUserWorkItem(this.CaptureImage, state);
await this.m_sem.WaitAsync();
try
{
return(await tcs.Task);
}
catch (Exception ex)
{
this.m_logger.LogError(ex, "Error capturing image");
ExceptionDispatchInfo.Capture(ex).Throw();
return(null);
}
finally
{
this.m_sem.Release();
}
}
public async Task <byte[]> CaptureImage(CaptureImageConfig parameters)
{
using (var resStream = typeof(FakeStillImageProvider).Assembly.GetManifestResourceStream("RaspberryPi.Camera.Resources.missing_image.jpg"))
using (MemoryStream ms = new MemoryStream())
{
await resStream.CopyToAsync(ms);
return(ms.ToArray());
}
}
private void CaptureImage(object state)
{
this.m_logger.LogDebug("Threadpool");
Tuple <CaptureImageConfig, TaskCompletionSource <byte[]> > args = (Tuple <CaptureImageConfig, TaskCompletionSource <byte[]> >)state;
CaptureImageConfig raspiArge = args.Item1;
TaskCompletionSource <byte[]> tcs = args.Item2;
try
{
string filename = Path.GetTempFileName();
ProcessStartInfo procStart = new ProcessStartInfo("raspistill");
procStart.RedirectStandardError = true;
procStart.RedirectStandardInput = true;
procStart.RedirectStandardOutput = true;
raspiArge.OutputFile = filename;
procStart.Arguments = raspiArge.ToString();
this.m_logger.LogDebug("raspistill {0}", raspiArge);
using (Process proc = new Process())
{
proc.StartInfo = procStart;
//proc.Exited += (s, e) =>
//{
//};
//proc.ErrorDataReceived += (s, e) =>
//{
// this.m_logger.LogWarning("raspistill err: {0}", e.Data);
//};
//proc.OutputDataReceived += (s, e) =>
//{
// this.m_logger.LogInformation("raspistill out: {0}", e.Data);
//};
if (!proc.Start())
{
this.m_logger.LogError("Process start failed");
throw new InvalidOperationException("Can't start process");
}
this.m_logger.LogDebug("proc.Start ok");
proc.WaitForExit();
this.m_logger.LogDebug("proc.WaitForExit ok");
this.m_logger.LogDebug("Raspistill exited with code {0}", proc.ExitCode);
try
{
if (proc.ExitCode != 0)
{
tcs.SetException(new InvalidProgramException($"Error occured, process return with code {proc.ExitCode}"));
}
else
{
using (FileStream fs = File.OpenRead(filename))
using (MemoryStream ms = new MemoryStream())
{
fs.CopyTo(ms);
tcs.TrySetResult(ms.ToArray());
}
}
}
finally
{
try
{
File.Delete(filename);
}
catch (Exception ex)
{
this.m_logger.LogWarning(ex, "Can't delete temp file");
Console.Error.WriteLine("Can't delete temp file " + filename);
}
}
}
}
catch (Exception ex)
{
this.m_logger.LogError(ex, "Error in raspistill execution");
tcs.TrySetException(ex);
}
}
public Task <byte[]> CaptureImage(CaptureImageConfig parameters)
{
throw new NotImplementedException();
}