public DataSource(TwainDevice twain, TwIdentity identity)
{
fTwain = twain;
fIdent = identity;
fState = StateType.Closed;
fSettings = null;
fCapabilities = null;
}
private void Raise_OnNewPictureData(Image image, DataSourceSettings theSettings)
{
if(OnNewPictureData != null)
{
NewPictureEventArgs args = new NewPictureEventArgs();
args.TheImage = image;
args.TheSettings = theSettings;
OnNewPictureData(this, args);
}
}
public bool Acquire(DataSourceSettings settings)
{
bool success = false;
if(this.Open())
{
fSettings = settings;
if(fSettings != null)
{
// Setup Pixel Type
TwCapPixelType pixelType;
switch(fSettings.ColorMode)
{
case ColorModeEnum.BW: pixelType = TwCapPixelType.BW; break;
case ColorModeEnum.RGB: pixelType = TwCapPixelType.RGB; break;
case ColorModeEnum.Gray: pixelType = TwCapPixelType.Gray; break;
default: pixelType = TwCapPixelType.BW; break;
}
fCapabilityPixelType.CurrentValue = pixelType;
#if USE_PAGE_TYPE
// Page Type Setting is not used anymore; Image Layout is defined instead
TwCapPageType pageType;
switch(fSettings.PageType)
{
case PageTypeEnum.Letter: pageType = TwCapPageType.UsLetter; break;
case PageTypeEnum.Legal: pageType = TwCapPageType.UsLegal; break;
default: pageType = TwCapPageType.UsLetter; break;
}
fCapabilityPageSize.CurrentValue = pageType;
#else
// Setup Scan Area
TwImageLayout ilayout = new TwImageLayout();
if(fTwain.GetImageLayout(fIdent, ilayout))
{
BoundsInches scanArea = settings.ScanArea;
ilayout.Frame.Left = (float)scanArea.X;
ilayout.Frame.Top = (float)scanArea.Y;
ilayout.Frame.Right = (float)(scanArea.X + scanArea.Width);
ilayout.Frame.Bottom = (float)(scanArea.Y + scanArea.Height);
fTwain.SetImageLayout(fIdent, ilayout);
}
#endif
// Setup Resolution
float resolution = (float)fSettings.Resolution;
fCapabilityResolutionX.CurrentValue = resolution;
fCapabilityResolutionY.CurrentValue = resolution;
// Enable/Disable Document Feeder
if(fSettings.EnableFeeder)
{
fCapabilityFeederEnabled.CurrentValue = fCapabilityFeederLoaded.CurrentValue;
}
else
{
fCapabilityFeederEnabled.CurrentValue = false;
}
// Analog adjustments
fCapabilityThreshold.ScaledValue = settings.Threshold;
fCapabilityBrightness.ScaledValue = settings.Brightness;
fCapabilityContrast.ScaledValue = settings.Contrast;
}
Application.AddMessageFilter(this);
fState = StateType.Active; // This makes IsActive = true
if(fTwain.StartDataSession(fIdent, settings.ShowSettingsUI, settings.ShowTransferUI))
{
success = true;
}
else
{
Stop(); // TODO: Is this OK?
}
}
return success;
}
public bool Acquire(DataSourceSettings settings)
{
bool result = false;
if(this.Open())
{
int colorMode;
switch(settings.ColorMode)
{
case ColorModeEnum.RGB: colorMode = (int)WiaPropertyCurrentIntent.WIA_INTENT_IMAGE_TYPE_COLOR; break;
case ColorModeEnum.Gray: colorMode = (int)WiaPropertyCurrentIntent.WIA_INTENT_IMAGE_TYPE_GRAYSCALE; break;
default: colorMode = (int)WiaPropertyCurrentIntent.WIA_INTENT_IMAGE_TYPE_TEXT; break;
}
int resolution = settings.Resolution;
int brightness = (int)((settings.Brightness - 0.5) * 2000);
int contrast = (int)((settings.Contrast - 0.5) * 2000);
AdjustScannerSettings(resolution, settings.ScanArea, brightness, contrast, colorMode);
bool morePages = true;
while(morePages)
{
Image newImage = Scan(settings.ShowTransferUI);
if(newImage != null)
{
Raise_OnNewPictureData(newImage, settings);
}
morePages = HasMorePages();
}
this.Close();
Raise_OnScanningComplete();
result = true;
}
return result;
}