public void Start()
{
if (!imageProvider.IsOpen)
{
Open();
}
if (!deviceHandle.IsValid || !imageProvider.IsOpen)
{
return;
}
log.DebugFormat("Starting device {0}, {1}", summary.Alias, summary.Identifier);
imageProvider.GrabErrorEvent += imageProvider_GrabErrorEvent;
imageProvider.GrabbingStartedEvent += imageProvider_GrabbingStartedEvent;
imageProvider.DeviceRemovedEvent += imageProvider_DeviceRemovedEvent;
imageProvider.ImageReadyEvent += imageProvider_ImageReadyEvent;
try
{
imageProvider.ContinuousShot();
}
catch (Exception e)
{
LogError(e, imageProvider.GetLastErrorMessage());
}
}
public SnapshotRetriever(CameraSummary summary, uint deviceIndex)
{
this.summary = summary;
imageProvider.GrabErrorEvent += imageProvider_GrabErrorEvent;
imageProvider.DeviceRemovedEvent += imageProvider_DeviceRemovedEvent;
imageProvider.ImageReadyEvent += imageProvider_ImageReadyEvent;
try
{
imageProvider.Open(deviceIndex);
}
catch (Exception e)
{
LogError(e, imageProvider.GetLastErrorMessage());
}
}
/* Handles the event related to an image having been taken and waiting for processing. */
private void OnImageReadyEventCallback()
{
if (InvokeRequired)
{
/* Suspend the grab thread for a while to avoid blocking the computer by using up all processor resources. */
System.Threading.Thread.Sleep(20); /* This is only required for this sample. */
/* If called from a different thread, we must use the Invoke method to marshal the call to the proper thread. */
BeginInvoke(new ImageProvider.ImageReadyEventHandler(OnImageReadyEventCallback));
return;
}
try
{
/* Acquire the image from the image provider. */
ImageProvider.Image image = m_imageProvider.GetCurrentImage();
/* Check if the image has been removed in the meantime. */
if (image != null)
{
/* Check if the image is compatible with the currently used bitmap. */
if (BitmapFactory.IsCompatible(m_bitmap, image.Width, image.Height, image.Color))
{
/* Update the bitmap with the image data. */
BitmapFactory.UpdateBitmap(m_bitmap, image.Buffer, image.Width, image.Height, image.Color);
/* To show the new image, request the display control to update itself. */
pictureBox.Refresh();
}
else /* A new bitmap is required. */
{
BitmapFactory.CreateBitmap(ref m_bitmap, image.Width, image.Height, image.Color);
BitmapFactory.UpdateBitmap(m_bitmap, image.Buffer, image.Width, image.Height, image.Color);
/* Provide the display control with the new bitmap. This action automatically updates the display. */
pictureBox.Image = m_bitmap;
}
if (is_recording == true)
{
RotateFlipType t = RotateFlipType.RotateNoneFlipY;
m_bitmap.RotateFlip(t);
aw.AddFrame(m_bitmap);
}
/* The processing of the image is done. Release the image buffer. */
m_imageProvider.ReleaseImage();
/* The buffer can be used for the next image grabs.
* If another image is in the output queue it can be acquired now using GetCurrentImage(). */
}
}
catch (Exception e)
{
ShowException(e, m_imageProvider.GetLastErrorMessage());
}
}
public SnapshotRetriever(CameraSummary summary, uint deviceIndex)
{
this.summary = summary;
imageProvider.GrabErrorEvent += imageProvider_GrabErrorEvent;
imageProvider.DeviceRemovedEvent += imageProvider_DeviceRemovedEvent;
imageProvider.ImageReadyEvent += imageProvider_ImageReadyEvent;
try
{
stopwatch.Start();
imageProvider.Open(deviceIndex);
log.DebugFormat("{0} opened in {1} ms.", summary.Alias, stopwatch.ElapsedMilliseconds);
stopwatch.Stop();
}
catch (Exception e)
{
LogError(e, imageProvider.GetLastErrorMessage());
}
}
/* Handles the event related to an image having been taken and waiting for processing. */
private void OnImageReadyEventCallback()
{
if (InvokeRequired)
{
/* If called from a different thread, we must use the Invoke method to marshal the call to the proper thread. */
BeginInvoke(new ImageProvider.ImageReadyEventHandler(OnImageReadyEventCallback));
return;
}
try
{
/* Acquire the image from the image provider. Only show the latest image. The camera may acquire images faster than images can be displayed*/
ImageProvider.Image image = m_imageProvider.GetLatestImage();
/* Check if the image has been removed in the meantime. */
if (image != null)
{
/* Check if the image is compatible with the currently used bitmap. */
if (BitmapFactory.IsCompatible(m_bitmap, image.Width, image.Height, image.Color))
{
/* Update the bitmap with the image data. */
BitmapFactory.UpdateBitmap(m_bitmap, image.Buffer, image.Width, image.Height, image.Color);
/* To show the new image, request the display control to update itself. */
pictureBox.Refresh();
}
else /* A new bitmap is required. */
{
BitmapFactory.CreateBitmap(out m_bitmap, image.Width, image.Height, image.Color);
BitmapFactory.UpdateBitmap(m_bitmap, image.Buffer, image.Width, image.Height, image.Color);
/* We have to dispose the bitmap after assigning the new one to the display control. */
Bitmap bitmap = pictureBox.Image as Bitmap;
/* Provide the display control with the new bitmap. This action automatically updates the display. */
pictureBox.Image = m_bitmap;
if (bitmap != null)
{
/* Dispose the bitmap. */
bitmap.Dispose();
}
}
/* The processing of the image is done. Release the image buffer. */
m_imageProvider.ReleaseImage();
/* The buffer can be used for the next image grabs. */
}
}
catch (Exception e)
{
ShowException(e, m_imageProvider.GetLastErrorMessage());
}
}
/// <summary>
/// 影像擷取完成通知
/// </summary>
private void OnImageReadyEventCallback()
{
try
{
/* Acquire the image from the image provider. Only show the latest image. The camera may acquire images faster than images can be displayed*/
ImageProvider.Image image = m_imageProvider.GetLatestImage();
/* Check if the image has been removed in the meantime. */
if (image != null)
{
//利用 GC Handle , 釘住記憶體不讓釋放，取得該記憶體位址
GCHandle pinnedArray = GCHandle.Alloc(image.Buffer, GCHandleType.Pinned);
IntPtr pointer = pinnedArray.AddrOfPinnedObject();
try
{
//'byte', 'complex', 'cyclic', 'direction', 'int1', 'int2', 'int4', 'int8', 'real', 'uint2'
var imgType = "byte";
HImage img = new HImage(imgType, image.Width, image.Height, pointer);
if (GrabImageChanged != null)
{
GrabImageChanged(m_imageProvider
, new System.ComponentModel.ProgressChangedEventArgs(1, img));
}
}
catch (Exception ex)
{
errorNotify(ex);
}
finally
{
//用完要釋放，否則該記憶體不會被回收
pinnedArray.Free();
}
/* The processing of the image is done. Release the image buffer. */
m_imageProvider.ReleaseImage();
/* The buffer can be used for the next image grabs. */
}
}
catch (Exception e)
{
OnGrabErrorEventCallback(e, m_imageProvider.GetLastErrorMessage());
}
}