/// <summary>
/// Application form is closing.
/// </summary>
private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
{
if (_currentDevice != null)
{
UnsubscribeFromDeviceEvents();
_currentDevice = null;
}
// close the device manager
_deviceManager.Close();
// dispose the device manager
_deviceManager.Dispose();
}
/// <summary>
/// Scans images.
/// </summary>
private void scanImagesButton_Click(object sender, EventArgs e)
{
try
{
// disable application UI
scanImagesButton.Enabled = false;
// create TWAIN device manager
using (DeviceManager deviceManager = new DeviceManager(this, this.Handle))
{
try
{
// try to find TWAIN device manager
deviceManager.IsTwain2Compatible = twain2CheckBox.Checked;
}
catch (Exception ex)
{
// show dialog with error message
MessageBox.Show(GetFullExceptionMessage(ex), "TWAIN device manager", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
// if 64-bit TWAIN2 device manager is used
if (IntPtr.Size == 8 && deviceManager.IsTwain2Compatible)
{
if (!InitTwain2DeviceManagerMode(deviceManager))
{
return;
}
}
try
{
// open the device manager
deviceManager.Open();
}
catch (Exception ex)
{
// show dialog with error message
MessageBox.Show(GetFullExceptionMessage(ex), "TWAIN device manager", MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
// if devices are NOT found
if (deviceManager.Devices.Count == 0)
{
MessageBox.Show("Devices are not found.");
return;
}
// if device is NOT selected
if (!deviceManager.ShowDefaultDeviceSelectionDialog())
{
MessageBox.Show("Device is not selected.");
return;
}
// get reference to the selected device
_device = deviceManager.DefaultDevice;
// set scan settings
_device.ShowUI = showUiCheckBox.Checked;
_device.ShowIndicators = showIndicatorsCheckBox.Checked;
_device.DisableAfterAcquire = !_device.ShowUI;
_device.CloseAfterModalAcquire = false;
AcquireModalState acquireModalState;
do
{
// synchronously acquire image from device
acquireModalState = _device.AcquireModal();
switch (acquireModalState)
{
case AcquireModalState.ImageAcquired:
// dispose previous bitmap in the picture box
if (pictureBox1.Image != null)
{
pictureBox1.Image.Dispose();
pictureBox1.Image = null;
}
// set a bitmap in the picture box
pictureBox1.Image = _device.AcquiredImage.GetAsBitmap(true);
// dispose an acquired image
_device.AcquiredImage.Dispose();
break;
case AcquireModalState.ScanCanceled:
MessageBox.Show("Scan is canceled.");
break;
case AcquireModalState.ScanFailed:
MessageBox.Show(string.Format("Scan is failed: {0}", _device.ErrorString));
break;
}
}while (acquireModalState != AcquireModalState.None);
// close the device
_device.Close();
_device = null;
// close the device manager
deviceManager.Close();
}
}
catch (TwainException ex)
{
MessageBox.Show(GetFullExceptionMessage(ex));
}
catch (Exception ex)
{
System.ComponentModel.LicenseException licenseException = GetLicenseException(ex);
if (licenseException != null)
{
// show information about licensing exception
MessageBox.Show(string.Format("{0}: {1}", licenseException.GetType().Name, licenseException.Message), "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
// open article with information about usage of evaluation license
System.Diagnostics.Process process = new System.Diagnostics.Process();
process.StartInfo.FileName = "https://www.vintasoft.com/docs/vstwain-dotnet/Licensing-Twain-Evaluation.html";
process.StartInfo.UseShellExecute = true;
process.Start();
}
else
{
throw;
}
}
finally
{
// enable application UI
scanImagesButton.Enabled = true;
}
}
/// <summary>
/// Opens TWAIN device manager.
/// </summary>
private void openDeviceManagerButton_Click(object sender, RoutedEventArgs e)
{
// clear list of devices
devicesComboBox.Items.Clear();
// if device manager is opened
if (_deviceManager.State == DeviceManagerState.Opened)
{
// close the device manager
_deviceManager.Close();
// change text on this button
openDeviceManagerButton.Content = "Open device manager";
}
// if device manager is closed
else
{
try
{
// try to find the device manager specified by user
if (twain2CompatibleCheckBox.IsChecked == true)
{
_deviceManager.IsTwain2Compatible = true;
}
else
{
_deviceManager.IsTwain2Compatible = false;
}
}
catch (Exception ex)
{
// show dialog with error message
MessageBox.Show(GetFullExceptionMessage(ex), "TWAIN device manager", MessageBoxButton.OK, MessageBoxImage.Error);
// open a HTML page with article describing how to solve the problem
OpenBrowser("https://www.vintasoft.com/docs/vstwain-dotnet/Programming-Twain-Device_Manager.html");
return;
}
// device manager is found
// if 64-bit TWAIN2 device manager is used
if (IntPtr.Size == 8 && _deviceManager.IsTwain2Compatible)
{
if (!InitTwain2DeviceManagerMode())
{
return;
}
}
try
{
// open the device manager
_deviceManager.Open();
}
catch (TwainDeviceManagerException ex)
{
// close the device manager
_deviceManager.Close();
// show dialog with error message
MessageBox.Show(GetFullExceptionMessage(ex), "TWAIN device manager", MessageBoxButton.OK, MessageBoxImage.Error);
// open a HTML page with article describing how to solve the problem
OpenBrowser("http://www.vintasoft.com/docs/vstwain-dotnet/index.html?Programming-Twain-Device_Manager.html");
return;
}
DeviceCollection devices = _deviceManager.Devices;
// for each available device
for (int i = 0; i < devices.Count; i++)
{
// add the device name to a combo box
devicesComboBox.Items.Add(devices[i].Info.ProductName);
// if device is default device
if (devices[i] == _deviceManager.DefaultDevice)
{
// select device in a combo box
devicesComboBox.SelectedIndex = i;
}
}
// change text on this button
openDeviceManagerButton.Content = "Close device manager";
}
// update UI
UpdateUI();
}
/// <summary>
/// Selects the device and acquires images from device.
/// </summary>
public void SelectDeviceAndAcquireImage()
{
#if !REMOVE_TWAIN_SDK
#if NETCORE
DeviceManager deviceManager = new DeviceManager(_parentForm, _parentForm.Handle);
#else
DeviceManager deviceManager = new DeviceManager(_parentForm);
#endif
try
{
Device device = null;
try
{
// try to use TWAIN device manager 2.x
deviceManager.IsTwain2Compatible = true;
// if TWAIN device manager 2.x is not found
if (!deviceManager.IsTwainAvailable)
{
try
{
// try to use TWAIN device manager 1.x
deviceManager.IsTwain2Compatible = false;
}
catch
{
if (IntPtr.Size != 8)
{
throw;
}
}
// if TWAIN device manager 1.x is not found
if (!deviceManager.IsTwainAvailable)
{
// show dialog with error message
MessageBox.Show("TWAIN device manager is not found.", "TWAIN device manager", MessageBoxButtons.OK, MessageBoxIcon.Error);
// open a HTML page with article describing how to solve the problem
DemosTools.OpenBrowser("https://www.vintasoft.com/docs/vstwain-dotnet/Programming-Twain-Device_Manager.html");
return;
}
}
// if 64-bit TWAIN2 device manager is used
if (IntPtr.Size == 8 && deviceManager.IsTwain2Compatible)
{
if (!InitTwain2DeviceManagerMode(deviceManager))
{
return;
}
}
try
{
// open the device manager
deviceManager.Open();
}
catch (Exception ex)
{
// show dialog with error message
DemosTools.ShowErrorMessage("TWAIN device manager", ex);
return;
}
// if devices are not found in the system
if (deviceManager.Devices.Count == 0)
{
MessageBox.Show("Devices are not found.");
return;
}
// if device is not selected
if (!deviceManager.ShowDefaultDeviceSelectionDialog())
{
return;
}
// get reference to the current device
device = deviceManager.DefaultDevice;
device.ShowUI = true;
// acquire image(s) from the device
AcquireModalState acquireModalState = AcquireModalState.None;
do
{
acquireModalState = device.AcquireModal();
switch (acquireModalState)
{
case AcquireModalState.ImageAcquired:
// get acquired image as Bitmap and add Bitmap to the image collection
_images.Add(new VintasoftImage(device.AcquiredImage.GetAsBitmap(), true));
// dispose the acquired image
device.AcquiredImage.Dispose();
break;
case AcquireModalState.ScanCompleted:
break;
case AcquireModalState.ScanCanceled:
MessageBox.Show("Scan canceled.");
break;
case AcquireModalState.ScanFailed:
MessageBox.Show(string.Format("Scan failed: {0}", device.ErrorString));
break;
}
}while (acquireModalState != AcquireModalState.None);
}
catch (TwainInvalidStateException ex)
{
DemosTools.ShowErrorMessage(ex);
}
catch (TwainDeviceManagerException ex)
{
DemosTools.ShowErrorMessage(ex);
}
catch (TwainDeviceException ex)
{
DemosTools.ShowErrorMessage(ex);
}
finally
{
if (device != null && device.State == DeviceState.Opened)
{
// close the device
device.Close();
}
if (deviceManager.State != DeviceManagerState.Closed)
{
// close the device manager
deviceManager.Close();
}
}
}
finally
{
deviceManager.Dispose();
}
#endif
}