/// <summary>
/// 设置下拉列表的当前值
/// </summary>
/// <param name="comboBox"></param>
/// <param name="capInfo"></param>
/// <returns></returns>
private bool SetCurrentValueOfComboBox(ComboBox comboBox, CapInfo capInfo)
{
if (capInfo.CurrentIntStr == null)
{
return(false);
}
string enumStr = twSession.ConvertIntStringToEnumString(capInfo.CapId, capInfo.CurrentIntStr);
string currentStr = null;
int i = comboBox.Items.Count - 1;
for (; i >= 0; i--)
{
string tempStr = (comboBox.Items[i] as ComboBoxItem).Content.ToString();
if (tempStr == enumStr)
{
comboBox.SelectedIndex = i;
currentStr = tempStr;
break;
}
}
if (i < 0)
{
return(false);
}
return(true);
}
/// <summary>
/// 系统消息处理函数
/// </summary>
/// <param name="msg"></param>
/// <param name="handled"></param>
private void MessageFilter(ref System.Windows.Interop.MSG msg, ref bool handled)
{
//1:让TWAIN进行消息处理
TwainCommand cmd = twSession.PassMessageWPF(ref msg);
messageLogger.Debug("TWAIN 信息 = " + cmd + ":" + DateTime.Now);
if (cmd == TwainCommand.Not || cmd == TwainCommand.Null) // 非数据源消息
{
handled = false; // 消息未处理，由窗口过程处理
return;
}
//2：进行消息处理
switch (cmd)
{
case TwainCommand.CloseRequest:
{
configFlag = false;
EndingScan();
twSession.DisableDS();
break;
}
case TwainCommand.CloseOk:
{
configFlag = true;
EndingScan();
twSession.DisableDS();
break;
}
case TwainCommand.DeviceEvent:
{
break;
}
//扫描仪传输就绪函数
case TwainCommand.TransferReady:
{
loadAndUnloadLogger.Debug("TWAIN 信息 = TransferReady " + DateTime.Now);
ScanImageViewer scanViewer = null;
try
{
if (ShowProgress)
{
//方式一：启动文件传输，弹出进度提示对话框
//获得文件格式
CapInfo capInfo;
capInfo = twSession.GetScannerCap(TwCap.ICAP_IMAGEFILEFORMAT);
string intStr = capInfo.CurrentIntStr;
string enumStr = twSession.ConvertIntStringToEnumString(TwCap.ICAP_IMAGEFILEFORMAT, intStr);
TwFileFormat fileFormat = (TwFileFormat)Enum.Parse(typeof(TwFileFormat), enumStr);
//获取分辨率
capInfo = twSession.GetScannerCap(TwCap.ICAP_XRESOLUTION);
Int32 resolution = Int32.Parse(capInfo.CurrentIntStr);
// 获得空白页检测阈值
capInfo = twSession.GetScannerCap(TwCap.ICAP_AUTODISCARDBLANKPAGES);
intStr = capInfo.CurrentIntStr;
int blankImageSizeThreshold = 0;
if (!Int32.TryParse(intStr, out blankImageSizeThreshold))
{
blankImageSizeThreshold = 0;
}
scanViewer = new ScanImageViewer(twSession, userConfig.MaxSize, blankImageSizeThreshold, resolution, fileFormat); //生成显示控件对象
scanViewer.StartTransfer(); //开始图像传输
scanViewer.ShowDialog(); //展示显示控件
scanResultList = scanViewer.ScanFileNames; //获取文件传输过程中的列表
}
else
{
//方式二：设置鼠标为等待状态，在相同线程中启动文件传输
Mouse.OverrideCursor = Cursors.Wait;
TransferFiles();
}
//发出扫描完成事件
logger.Debug("扫描完成 :" + DateTime.Now);
RoutedEventArgs scanArgs = new RoutedEventArgs(ScanCompletedEvent);
RaiseEvent(scanArgs);
break;
}
catch (Exception e)
{
logger.Error("在MessageFilter中发生异常，异常信息; " + e.Message);
}
finally
{
if (scanViewer != null)
{
logger.Debug("关闭扫描仪。");
scanViewer.Close();
}
//结束扫描
logger.Debug("结束扫描，使DS变为非使能状态。");
EndingScan();
twSession.DisableDS();
if (!ShowProgress)
{
//将鼠标复位
Mouse.OverrideCursor = null;
}
}
break;
}
default:
break;
}
handled = true;
}