public override void StartCapture(BackgroundWorker bw)
{
NikonCameraImage helper = new NikonCameraImage();
Int32 index = 0;
helper.camera = _camera;
helper.index = index;
bw.RunWorkerAsync(helper);
}
public override BitmapSource GetImage(DoWorkEventArgs e)
{
NikonCameraImage helper = (NikonCameraImage)e.Argument;
BitmapSource source = null, orginalSource = null;
try
{
SniCamResult sResult = DS_U3Wrapper.SniCamGetNextImage(helper.camera.handle,
helper.stop, out helper.format, out helper.index, ref helper.image);
if (sResult < SniCamResult.SNI_OK)
{
throw new Exception("SniCamGetNextImage returned " + sResult);
}
DS_U3Wrapper.SniImageFormat format = (DS_U3Wrapper.SniImageFormat)Marshal.PtrToStructure(
helper.format, typeof(DS_U3Wrapper.SniImageFormat));
//Allocate space for image buffer
IntPtr buffer = IntPtr.Zero;
byte[] managedBuffer;
try
{
buffer = Marshal.AllocHGlobal(2 * format.buf_size.ToInt32());
sResult = DS_U3Wrapper.SniCamGetImageData(helper.camera.handle,
helper.image, (uint)(2 * format.buf_size.ToInt32()), ref buffer);
if (sResult != SniCamResult.SNI_OK)
{
DS_U3Wrapper.SniCamReleaseImage(helper.camera.handle, ref helper.image);
throw new Exception("SniCamGetImageData returned " + sResult);
}
if (format.mode == ESniColorMode.sniRgb24)
{
managedBuffer = new byte[format.buf_size.ToInt32()];
Marshal.Copy(buffer, managedBuffer, 0, format.buf_size.ToInt32());
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(format.width, format.height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
System.Drawing.Imaging.BitmapData bmpData = bmp.LockBits(
new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height),
System.Drawing.Imaging.ImageLockMode.WriteOnly, bmp.PixelFormat);
Marshal.Copy(managedBuffer, 0, bmpData.Scan0, managedBuffer.Length);
bmp.UnlockBits(bmpData);
IntPtr hBitmap = bmp.GetHbitmap();
BitmapSizeOptions sizeOptions = BitmapSizeOptions.FromEmptyOptions();
try
{
orginalSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero,
System.Windows.Int32Rect.Empty, sizeOptions);
}
finally
{
DeleteObject(hBitmap);
}
if ((Properties.Settings.Default.CropHeight == 0 && Properties.Settings.Default.CropWidth == 0) ||
(Properties.Settings.Default.CropHeight + Properties.Settings.Default.CropTop > orginalSource.Height) ||
(Properties.Settings.Default.CropWidth + Properties.Settings.Default.CropLeft > orginalSource.Width)
)
{
source = orginalSource;
CropImageWidth = 0;
CropImageHeight = 0;
}
else
{
source = new CroppedBitmap(orginalSource,
new System.Windows.Int32Rect((int)Properties.Settings.Default.CropLeft,
(int)Properties.Settings.Default.CropTop,
(int)(Properties.Settings.Default.CropWidth == 0 ?
orginalSource.Width : Properties.Settings.Default.CropWidth),
(int)(Properties.Settings.Default.CropHeight == 0 ?
orginalSource.Height : Properties.Settings.Default.CropHeight)));
CropImageWidth = source.Width;
CropImageHeight = source.Height;
}
source.Freeze();
ImageWidth = orginalSource.Width;
ImageHeight = orginalSource.Height;
sResult = DS_U3Wrapper.SniCamReleaseImage(helper.camera.handle, ref helper.image);
if (sResult != SniCamResult.SNI_OK)
{
throw new Exception("SniCamReleaseImage returned " + sResult);
}
}
else
{
App.LogEntry.AddEntry("Nikon Camera is not in ESniColorMode.sniRgb24 - please reset it.");
}
}
catch (Exception /*ex*/)
{
throw;
}
finally
{
if (buffer != IntPtr.Zero)
{
Marshal.FreeHGlobal(buffer);
buffer = IntPtr.Zero;
}
}
}
catch (Exception ex)
{
App.LogEntry.AddEntry("Failed to get image: " + ex.Message);
}
finally
{
}
return(source);
}
