1

它是关于 TWAINdotNet 库的。我花了过去 24 小时尝试在 C#/WPF/VS2010 中进行基本的虚拟扫描仪实验。我已经从http://sourceforge.net/projects/twain-samples/files/下载并安装了虚拟扫描仪驱动程序，它在可用的 TWAIN 数据源列表中显示得很好。有趣的是，此页面上提供的示例应用程序也可以与此驱动程序完美配合。仅当我尝试通过 C#/WPF 使用它时才会出现此问题。

具体来说，调用DsUserInterfaceusingMessage.EnableDS失败，天知道是什么原因。无论我是否要求它显示 UI，它在所有情况下都会失败。同样DsImageLayout，在尝试设置扫描区域时调用也会导致失败。最后但并非最不重要的一点是，尝试将测量单位设置为英寸（或其他）也不会生效。调用不会失败，但之前的值保持不变。

这是代码，以防我可能做错了什么：

public partial class MainWindow : Window
{
    TwainDotNet.Wpf.WpfWindowMessageHook mTwnHook;
    TwainDotNet.Twain mTWN;
    TwainDotNet.ScanSettings setting = new TwainDotNet.ScanSettings();

    public MainWindow()
    {
        InitializeComponent();
    }

    private void btnScan_Click(object sender, RoutedEventArgs e)
    {
        InitializeTWAIN();

        mTWN.ScanningComplete += twn_ScanningComplete;
        mTWN.TransferImage += twn_TransferImage;

        mTWN.StartScanning(setting);            
    }

    private void InitializeTWAIN()
    {
        mTwnHook = new TwainDotNet.Wpf.WpfWindowMessageHook(this);
        mTWN = new TwainDotNet.Twain(mTwnHook);

        setting.UseAutoFeeder = true;
        setting.UseDocumentFeeder = true;
        setting.UseDuplex = true;
        setting.TransferCount = 1;

        setting.Page = new TwainDotNet.PageSettings() 
        { 
                    Orientation = TwainDotNet.TwainNative.Orientation.Auto, 
                    Size = TwainDotNet.TwainNative.PageType.UsLetter 
        };

        setting.Area = new TwainDotNet.AreaSettings(TwainDotNet.TwainNative.Units.Millimeters, 0f, 0f, 279.4f, 215.9f);
        setting.Resolution = new TwainDotNet.ResolutionSettings() 
        { 
                    ColourSetting = TwainDotNet.ColourSetting.Colour, 
                    Dpi = 100 
        };

        setting.ShouldTransferAllPages = true;
        setting.ShowTwainUI = false;
    }

    void twn_TransferImage(object sender, TwainDotNet.TransferImageEventArgs e)
    {
      //save  image
    }

    void twn_ScanningComplete(object sender, TwainDotNet.ScanningCompleteEventArgs e)
    {
        if (e.Exception != null)
            MessageBox.Show(e.Exception.Message);
    }
}
4

0 回答 0