public override bool Connect()
{
bool result = false;
try
{
//discover camera
_camera = new DS_U3Wrapper.SniCameraInfo();
Int32 cameraCount = 0;
IntPtr unmanagedCameraInfoAddr = IntPtr.Zero;
SniCamResult sResult = DS_U3Wrapper.SniCamDiscoverCameras(out unmanagedCameraInfoAddr, out cameraCount);
if (sResult != SniCamResult.SNI_OK)
{
throw new Exception("Could not connect to the DS-U3 successfully");
}
if (cameraCount == 0)
{
throw new Exception("DS-U3 not available or no cameras connected.");
}
// Marshal the data at the returned pointer into a managed object
_camera = (DS_U3Wrapper.SniCameraInfo)Marshal.PtrToStructure(unmanagedCameraInfoAddr, typeof(DS_U3Wrapper.SniCameraInfo));
unmanagedCameraInfoAddr = IntPtr.Zero;
//open camera
IntPtr cameraHandle = IntPtr.Zero;
sResult = DS_U3Wrapper.SniCamOpenCamera(ref _camera, out cameraHandle);
if (sResult != SniCamResult.SNI_OK)
{
throw new Exception("Could not open Camera Handle");
}
_camera.handle = cameraHandle;
// Need to check status of camera. According to camera logs,
// if the Nikon software finds the camera in a status other
// than available, it requests the driver version, then closes
// and opens the camera. Not sure why, but prevents the controller
// from simply preventing communication with the camera.
if (_camera.status != 0)
{
StringBuilder version = new StringBuilder(34);
DS_U3Wrapper.SniCamGetDriverVersion(_camera.handle, version);
DS_U3Wrapper.SniCamCloseCamera(_camera.handle);
_camera.handle = IntPtr.Zero;
sResult = DS_U3Wrapper.SniCamOpenCamera(ref _camera, out cameraHandle);
if (sResult != SniCamResult.SNI_OK)
{
throw new Exception("Could not open Camera Handle");
}
_camera.handle = cameraHandle;
}
_features = new Dictionary <Features, DS_U3Wrapper.SniFeature>();
IntPtr p;
sResult = DS_U3Wrapper.SniCamGetFeatures(_camera.handle, out p);
if (sResult != SniCamResult.SNI_OK)
{
throw new Exception("Could not get Camera features");
}
int numFeatures = Marshal.ReadInt32(p);
//move to first feature element
p = (IntPtr)(p.ToInt32() + Marshal.SizeOf(typeof(DS_U3Wrapper.SniFeatures)) -
Marshal.SizeOf(typeof(IntPtr)));
// Setup a mapping from feature name to feature ID number, in order to more easily
// access features by name.
for (int i = 0; i < numFeatures; i++)
{
DS_U3Wrapper.SniFeature feature = (DS_U3Wrapper.SniFeature)Marshal.PtrToStructure(p,
typeof(DS_U3Wrapper.SniFeature));
foreach (Features featureName in Enum.GetValues(typeof(Features)))
{
if (featureName.ToString().Equals(feature.name))
{
_features.Add(featureName, feature);
}
}
//move to next feature element
p = (IntPtr)(p.ToInt32() + Marshal.SizeOf(typeof(DS_U3Wrapper.SniFeature)));
}
//initialise settings
InitializeSettings();
result = true;
}
catch (Exception /*ex*/)
{
if (_camera.handle != IntPtr.Zero)
{
DS_U3Wrapper.SniCamCloseCamera(_camera.handle);
_camera.handle = IntPtr.Zero;
}
result = false;
}
return(result);
}
