/// <summary>
/// Get a list of all pointer of the cameras connected to the host
/// </summary>
/// <returns>A list of connected cameras as pointer</returns>
/// <exception cref="ObjectDisposedException">This instance has been disposed already</exception>
/// <exception cref="SDKException">An SDK call failed</exception>
protected IEnumerable <IntPtr> GetCameraPointerList()
{
if (IsDisposed)
{
throw new ObjectDisposedException(nameof(CanonAPI));
}
IntPtr camlist;
//Get camera list
ErrorHandler.CheckError(this, CanonSDK.EdsGetCameraList(out camlist));
//Get number of connected cameras
int camCount;
ErrorHandler.CheckError(this, CanonSDK.EdsGetChildCount(camlist, out camCount));
List <IntPtr> ptrList = new List <IntPtr>();
for (int i = 0; i < camCount; i++)
{
//Get camera pointer
IntPtr cptr;
ErrorHandler.CheckError(this, CanonSDK.EdsGetChildAtIndex(camlist, i, out cptr));
ptrList.Add(cptr);
}
//Release the list
ErrorHandler.CheckError(this, CanonSDK.EdsRelease(camlist));
return(ptrList);
}
/// <summary>
/// Gets a <see cref="Bitmap"/> from an EDSDK pointer to an image (Jpg or Raw)
/// </summary>
/// <param name="imgStream">Stream pointer to the image</param>
/// <param name="imageSource">The result image type</param>
/// <returns>A <see cref="Bitmap"/> image from the given stream pointer</returns>
protected Bitmap GetImage(IntPtr imgStream, ImageSource imageSource)
{
IntPtr imgRef = IntPtr.Zero;
IntPtr streamPointer = IntPtr.Zero;
ImageInfo imageInfo;
try
{
//create reference and get image info
ErrorHandler.CheckError(this, CanonSDK.EdsCreateImageRef(imgStream, out imgRef));
ErrorHandler.CheckError(this, CanonSDK.EdsGetImageInfo(imgRef, imageSource, out imageInfo));
Size outputSize = new Size();
outputSize.Width = imageInfo.EffectiveRect.Width;
outputSize.Height = imageInfo.EffectiveRect.Height;
//calculate amount of data
int datalength = outputSize.Height * outputSize.Width * 3;
//create buffer that stores the image
byte[] buffer = new byte[datalength];
//create a stream to the buffer
using (var stream = new SDKStream(buffer))
{
//load image into the buffer
ErrorHandler.CheckError(this, CanonSDK.EdsGetImage(imgRef, imageSource, TargetImageType.RGB, imageInfo.EffectiveRect, outputSize, stream.Reference));
//make BGR from RGB (System.Drawing (i.e. GDI+) uses BGR)
unsafe
{
byte tmp;
fixed(byte *pix = buffer)
{
for (long i = 0; i < datalength; i += 3)
{
tmp = pix[i]; //Save B value
pix[i] = pix[i + 2]; //Set B value with R value
pix[i + 2] = tmp; //Set R value with B value
}
}
}
//Get pointer to stream data
ErrorHandler.CheckError(this, CanonSDK.EdsGetPointer(stream.Reference, out streamPointer));
//Create bitmap with the data in the buffer
return(new Bitmap(outputSize.Width, outputSize.Height, datalength, PixelFormat.Format24bppRgb, streamPointer));
}
}
finally
{
//Release all data
if (imgStream != IntPtr.Zero)
{
ErrorHandler.CheckError(this, CanonSDK.EdsRelease(imgStream));
}
if (imgRef != IntPtr.Zero)
{
ErrorHandler.CheckError(this, CanonSDK.EdsRelease(imgRef));
}
}
}
/// <summary>
/// Initializes the SDK
/// </summary>
/// <param name="useCallingThread">If true, the calling thread will be used as SDK main thread;
/// if false, a separate thread will be created</param>
public CanonAPI(bool useCallingThread)
{
try
{
//Ensure that only one caller at a time can increase the counter
lock (InitLock)
{
//If no instance exists yet, initialize everything
if (RefCount == 0)
{
if (useCallingThread)
{
if (Thread.CurrentThread.GetApartmentState() != ApartmentState.STA)
{
throw new ThreadStateException("Calling thread must be in STA");
}
ErrorHandler.CheckError(this, CanonSDK.EdsInitializeSDK());
}
else
{
//Trying to trigger DllNotFoundException so it's not thrown
//in the event loop on a different thread:
CanonSDK.EdsRelease(IntPtr.Zero);
//Start the main thread where SDK will run on
MainThread = new ApiThread();
MainThread.Start();
//Initialize the SDK on the main thread
MainThread.Invoke(() => ErrorHandler.CheckError(this, CanonSDK.EdsInitializeSDK()));
}
CanonSDK.InitializeVersion();
//Subscribe to the CameraAdded event
CameraAddedEvent = new SDKCameraAddedHandler(CanonAPI_CameraAddedEvent);
ErrorHandler.CheckError(this, CanonSDK.EdsSetCameraAddedHandler(CameraAddedEvent, IntPtr.Zero));
_IsSDKInitialized = true;
}
RefCount++;
}
}
catch (Exception e)
{
IsDisposed = true;
if (MainThread?.IsRunning == true)
{
MainThread.Shutdown();
}
throw;
}
}
/// <summary>
/// Releases this entry but not the subentries
/// </summary>
/// <param name="managed">True if called from Dispose, false if called from the finalizer/destructor</param>
protected virtual void Dispose(bool managed)
{
if (!IsDisposed)
{
if (managed)
{
DisposeThumb();
}
if (Reference != IntPtr.Zero)
{
CanonSDK.EdsRelease(Reference);
}
IsDisposed = true;
}
}
