/// <summary>
/// 初始化扫描进程显示界面
/// 添加文件保存后台线程的三个回调方法
/// </summary>
private void Init()
{
worker.DoWork += delegate(object s, DoWorkEventArgs args)
{
String fileSingleName; // 每次传输返回的文件名
//获取传输模式
TwMode mode = twSession.GetCurrentTransferMode();
switch (mode)
{
case TwMode.TWSX_FILE:
transferFileAction = twSession.TransferSingleFileInFileMode;
break;
case TwMode.TWSX_NATIVE:
transferFileAction = twSession.TransferSingleFileInNativeMode;
break;
default:
break;
}
// 1：初始化GDI+
Gdip.InitGDIPlus();
//2：依次传输每个文件
logger.Debug("开始传输文件:" + DateTime.Now);
if (transferFileAction != null)
{
int count = 0;
try
{
do
{
logger.Debug("开始传输单个文件: count = " + count);
//传输单个文件
transferResult = transferFileAction(fileType, out fileSingleName, resolution, out msg);
logger.Debug("传输单个文件结束: result = " + transferResult);
logger.Debug("开始结束一次传输过程。");
twSession.EndXfer(out count);
logger.Debug("结束一次传输过程结束: count = " + count);
//2.1:传输成功则检查文件大小
if (transferResult == TwRC.XferDone)
{
logger.Debug("得到一个传输文件: " + DateTime.Now);
if (fileSingleName != null)
{
//A:判断读取的文件大小,零字节则不添加到列表中
FileInfo fileInfo = new FileInfo(fileSingleName);
if (fileInfo.Length > blankSizeLimit && fileInfo.Length < maxImageSize)
{
cnt++;
fileNames.Add(fileSingleName);
worker.ReportProgress(fileNames.Count);
logger.Debug("添加文件到列表，文件名: " + fileSingleName);
//iacTwain.RaiseGetOnePageEvent(fileSingleName);
}
//B:否则删除文件
else
{
fileInfo.Delete();
logger.Info("删除太大或太小的扫描结果文件。");
}
}
else
{
logger.Debug("文件名为null。");
}
}
//2.2:传输失败则跳出循环
else
{
logger.Debug("传输失败，跳出循环。");
//if (count != 0) //如果扫描仪还有图像未传输，通知扫描仪清空
// twSession.ResetScanner();
break;
}
logger.Debug("结束传输单个文件: count = " + count);
} while (count != 0 && count != -2);
logger.Debug("结束循环 :" + DateTime.Now);
}
#region 异常处理
catch (ArgumentNullException e)
{
logger.Error("参数为空异常，异常信息: " + e.Message);
}
catch (ArgumentException e)
{
logger.Error("无效参数异常，异常信息: " + e.Message);
}
catch (System.Security.SecurityException e)
{
logger.Error("安全性错误引发的异常，异常信息: " + e.Message);
}
catch (UnauthorizedAccessException e)
{
logger.Error("IO错误或指定类型引发的安全性错误引发的异常，异常信息: " + e.Message);
}
catch (PathTooLongException e)
{
logger.Error("路径太长引发的异常，异常信息: " + e.Message);
}
catch (NotSupportedException e)
{
logger.Error("调用的方法不受支持或视图读取，查找或写入不支持调用功能的流引发的异常，异常信息: " + e.Message);
}
catch (IOException e)
{
logger.Error("IO异常，异常信息: " + e.Message);
}
catch (Exception e)
{
logger.Error("操作发生异常，异常信息: " + e.Message);
}
finally
{
Gdip.ClearGDIPlus();
}
#endregion
}
};
worker.ProgressChanged += delegate(object s, ProgressChangedEventArgs args)
{
buttonControl.Content = "已经扫描传输" + cnt + "页";
};
worker.RunWorkerCompleted += delegate(object s, RunWorkerCompletedEventArgs args)
{
if (transferResult == TwRC.Failure)
{
MessageBox.Show("扫描失败:" + msg);
}
else
{
if (twSession.State >= TwState.OpenDS)
{
twSession.DisableDS();
}
}
if (transferResult == TwRC.TransferError)
{
MessageBox.Show("传输失败:" + msg);
}
if (transferResult == TwRC.BadValue)
{
MessageBox.Show("扫描仪当前设置不支持文件格式" + fileType + "，请重新设置");
}
Close();
};
}
/// <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;
}
