public static DataSource GetDefault(Identity applicationId, IWindowsMessageHook messageHook)
{
var defaultSourceId = new Identity();
// Attempt to get information about the system default source
var result = Twain32Native.DsmIdentity(
applicationId,
IntPtr.Zero,
DataGroup.Control,
DataArgumentType.Identity,
Message.GetDefault,
defaultSourceId);
if (result != TwainResult.Success)
{
var status = DataSourceManager.GetConditionCode(applicationId, null);
throw new TwainException("Error getting information about the default source: " + result, result, status);
}
return(new DataSource(applicationId, defaultSourceId, messageHook));
}
public void OpenSource()
{
var result = Twain32Native.DsmIdentity(
_applicationId,
IntPtr.Zero,
DataGroup.Control,
DataArgumentType.Identity,
Message.OpenDS,
SourceId);
if (result != TwainResult.Success)
{
var conditionCode = DataSourceManager.GetConditionCode(_applicationId, SourceId);
_log.Debug(string.Format("OpenDS, result: {0}, conditionCode: {1}", result, conditionCode));
throw new TwainException("Error opening data source", result, conditionCode);
}
_log.Debug("OpenDS, result: " + result);
SourceState = TwainState.SourceOpen;
}
public void Close()
{
var result = Twain32Native.DsmIdentity(
_applicationId,
IntPtr.Zero,
DataGroup.Control,
DataArgumentType.Identity,
Message.CloseDS,
SourceId);
if (result != TwainResult.Failure)
{
_log.Debug(string.Format("CloseDS, result: {0}", result));
SourceState = null;
}
else
{
var condition = DataSourceManager.GetConditionCode(_applicationId, SourceId);
_log.Debug(string.Format("CloseDS, result: {0}, conditionCode: {1}", result, condition));
}
}
protected ConditionCode GetStatus()
{
return(DataSourceManager.GetConditionCode(_applicationId, _sourceId));
}
private bool NegotiateArea(ScanSettings scanSettings)
{
var area = scanSettings.Area;
if (area == null)
{
return(false);
}
try
{
var cap = new Capability(Capabilities.IUnits, TwainType.Int16, _applicationId, SourceId);
if ((Units)cap.GetBasicValue().Int16Value != area.Units)
{
Capability.SetCapability(Capabilities.IUnits, (short)area.Units, _applicationId, SourceId);
}
}
catch
{
// Do nothing if the data source does not support the requested capability
return(false);
}
float right;
float bottom;
float physicalHeight = 0;
var physicalHeightCap = Capability.GetCapability(Capabilities.PhysicalHeight, _applicationId, SourceId);
if (physicalHeightCap != null && physicalHeightCap.Count == 1)
{
physicalHeight = ValueConverter.ConvertToFix32(physicalHeightCap[0]);
}
float physicalWidth = 0;
var physicalWidthCap = Capability.GetCapability(Capabilities.PhysicalWidth, _applicationId, SourceId);
if (physicalWidthCap != null && physicalWidthCap.Count == 1)
{
physicalWidth = ValueConverter.ConvertToFix32(physicalWidthCap[0]);
}
right = physicalWidth < area.Right ? physicalWidth : area.Right;
bottom = physicalHeight < area.Bottom ? physicalHeight : area.Bottom;
var imageLayout = new ImageLayout
{
Frame = new Frame
{
Left = new Fix32(area.Left),
Top = new Fix32(area.Top),
Right = new Fix32(right),
Bottom = new Fix32(bottom)
}
};
var result = Twain32Native.DsImageLayout(
_applicationId,
SourceId,
DataGroup.Image,
DataArgumentType.ImageLayout,
Message.Set,
imageLayout);
if (result != TwainResult.Success && result != TwainResult.CheckStatus)
{
var condition = DataSourceManager.GetConditionCode(_applicationId, SourceId);
return(false);
//throw new TwainException("DsImageLayout.GetDefault error", result, condition);
}
return(true);
}