/// <summary>
/// DG_CONTROL / DAT_STATUS / MSG_GET
/// Returns the current Condition Code for the specified Source.
/// </summary>
/// <param name="appId">This points to a TwIdentity structure.</param>
/// <param name="msg">The Message of the operation triplet.</param>
/// <param name="data">The pData parameter is a pointer to the data (a variable or, more
/// typically, a structure) that will be used according to the action specified by the operation
/// triplet.</param>
/// <returns>TWAIN Return Codes.</returns>
private TwRC _StatusControlProcessRequest(TwIdentity appId, TwMSG msg, IntPtr data)
{
TwStatus _status = (TwStatus)Marshal.PtrToStructure(data, typeof(TwStatus));
switch (msg)
{
case TwMSG.Get:
_status.ConditionCode = this._handlers.ContainsKey(appId.Id)?this._handlers[appId.Id].ConditionCode:this.ConditionCode;
Marshal.StructureToPtr(_status, data, true);
this._SetConditionCode(appId, TwCC.Success);
return(TwRC.Success);
}
throw new DataSourceException(TwRC.Failure, TwCC.BadProtocol);
}
public TwStatus GetDataSourceManagerStatus()
{
TwStatus result = new TwStatus();
TwRC rc = LibTwain32.DSMstatus(fApplicationId, IntPtr.Zero, TwDG.Control, TwDAT.Status, TwMSG.Get, result);
return (rc == TwRC.Success) ? result : null;
}
public TwStatus GetDataSourceStatus(TwIdentity dataSourceId)
{
TwStatus result = new TwStatus();
TwRC rc = LibTwain32.DSstatus(fApplicationId, dataSourceId, TwDG.Control, TwDAT.Status, TwMSG.Get, result);
return (rc == TwRC.Success) ? result : null;
}
public bool GetDataSourceManagerStatus(TwStatus result)
{
TwRC rc = LibTwain32.DSMstatus(fApplicationId, IntPtr.Zero, TwDG.Control, TwDAT.Status, TwMSG.Get, result);
return (bool)(rc == TwRC.Success);
}
private string GetTwainStatus()
{
TwStatus status = new TwStatus();
TwRC _rc = tw.DsmStatus(appId, IntPtr.Zero, TwDG.Control, TwDAT.Status, TwMSG.Get, status);
switch (status.ConditionCode)
{
case TwCC.Success:
return("It worked!");
case TwCC.Bummer:
return("Failure due to unknown causes.");
case TwCC.LowMemory:
return("Not enough memory to perform operation.");
case TwCC.NoDS:
return("No Data Source.");
case TwCC.MaxConnections:
return("DS is connected to max possible applications.");
case TwCC.OperationError:
return("DS or DSM reported error, application shouldn't.");
case TwCC.BadCap:
return("Unknown capability.");
case TwCC.BadProtocol:
return("Unrecognized MSG DG DAT combination.");
case TwCC.BadValue:
return("Data parameter out of range.");
case TwCC.SeqError:
return("DG DAT MSG out of expected sequence.");
case TwCC.BadDest:
return("Unknown destination Application/Source in DSM_Entry.");
case TwCC.CapUnsupported:
return("Capability not supported by source.");
case TwCC.CapBadOperation:
return("Operation not supported by capability.");
case TwCC.CapSeqError:
return("Capability has dependancy on other capability.");
/* Added 1.8 */
case TwCC.Denied:
return("File System operation is denied (file is protected).");
case TwCC.FileExists:
return("Operation failed because file already exists.");
case TwCC.FileNotFound:
return("File not found.");
case TwCC.NotEmpty:
return("Operation failed because directory is not empty.");
case TwCC.PaperJam:
return("The feeder is jammed.");
case TwCC.PaperDoubleFeed:
return("The feeder detected multiple pages.");
case TwCC.FileWriteError:
return("Error writing the file (meant for things like disk full conditions).");
case TwCC.CheckDeviceOnline:
return("The device went offline prior to or during this operation.");
default:
return("Unknown error.");
}
}
public bool GetDataSourceStatus(TwIdentity dataSourceId, TwStatus result)
{
TwRC rc = LibTwain32.DSstatus(fApplicationId, dataSourceId, TwDG.Control, TwDAT.Status, TwMSG.Get, result);
return (bool)(rc == TwRC.Success);
}
/// <summary>
/// Возвращает код состояния TWAIN.
/// </summary>
/// <returns></returns>
private TwCC _GetStatus() {
TwStatus _status=new TwStatus();
TwRC _rc=this.DsStatus(this._appid,this._srcds,TwDG.Control,TwDAT.Status,TwMSG.Get,_status);
return _status.ConditionCode;
}
internal static extern TwRC DsmEntryStatus([In, Out] TwIdentity origin, IntPtr zeropt, TwDG dg, TwDAT dat, TwMSG msg, [In, Out] TwStatus dsmstat);
public TwRC DsStatus([In, Out] TwIdentity origin, [In] TwIdentity dest, TwDG dg, TwDAT dat, TwMSG msg, [In, Out] TwStatus twstatus)
{
return(DsEntryStatus(origin, dest, dg, dat, msg, twstatus));
}
public TwRC DsmStatus([In, Out] TwIdentity origin, IntPtr zeropt, TwDG dg, TwDAT dat, TwMSG msg, [In, Out] TwStatus dsmstat)
{
return(DsmEntryStatus(origin, zeropt, dg, dat, msg, dsmstat));
}
internal static extern TwRC DsEntryStatus([In, Out] TwIdentity origin, [In] TwIdentity dest, TwDG dg, TwDAT dat, TwMSG msg, [In, Out] TwStatus twstatus);