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Add stepdown for currently supported state levels

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This commit is contained in:
Eugene Wang
2023-04-01 15:42:18 -04:00
parent 5aa808024f
commit f63fbc8371
4 changed files with 33 additions and 11 deletions
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6
samples/Console32/Program.cs
View File

@@ -15,18 +15,18 @@ namespace SampleConsole
var twain = new TwainSession(Assembly.GetExecutingAssembly().Location);
twain.StateChanged += Twain_StateChanged;
var hwnd = IntPtr.Zero;
var hwnd = IntPtr.Zero; // required for windows
var rc = twain.DGControl.Parent.OpenDSM(ref hwnd);
Debug.WriteLine($"OpenDSM={rc}");
if (rc == TWAINWorkingGroup.STS.SUCCESS)
if (rc == STS.SUCCESS)
{
Debug.WriteLine($"CloseDSM={rc}");
rc = twain.DGControl.Parent.CloseDSM(ref hwnd);
}
}
private static void Twain_StateChanged(TwainSession session, TWAINWorkingGroup.STATE state)
private static void Twain_StateChanged(TwainSession session, STATE state)
{
Console.WriteLine($"State changed to {state}");
}

15
samples/WinForm32/Form1.cs
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@@ -1,5 +1,6 @@
using NTwain;
using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Reflection;
using System.Windows.Forms;
@@ -21,7 +22,7 @@ namespace WinForm32
twain.StateChanged += Twain_StateChanged;
}
private static void Twain_StateChanged(TwainSession session, TWAINWorkingGroup.STATE state)
private static void Twain_StateChanged(TwainSession session, STATE state)
{
Console.WriteLine($"State changed to {state}");
}
@@ -34,12 +35,14 @@ namespace WinForm32
var hwnd = this.Handle;
var rc = twain.DGControl.Parent.OpenDSM(ref hwnd);
Debug.WriteLine($"OpenDSM={rc}");
}
if (rc == TWAINWorkingGroup.STS.SUCCESS)
{
Debug.WriteLine($"CloseDSM={rc}");
rc = twain.DGControl.Parent.CloseDSM(ref hwnd);
}
protected override void OnClosing(CancelEventArgs e)
{
var finalState = twain.TryStepdown(STATE.S2);
Debug.WriteLine($"Stepdown result state={finalState}");
base.OnClosing(e);
}
}
}

4
src/NTwain/Triplets/DATParent.cs
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@@ -22,6 +22,7 @@ namespace NTwain.Triplets
STS rc;
if ((rc = DoIt(MSG.OPENDSM, ref hwnd)) == STS.SUCCESS)
{
Session._hwnd = hwnd;
Session.State = STATE.S3;
// determine memory mgmt routines used
if ((((DG)Session._appIdentityLegacy.SupportedGroups) & DG.DSM2) == DG.DSM2)
@@ -46,8 +47,9 @@ namespace NTwain.Triplets
STS rc;
if ((rc = DoIt(MSG.CLOSEDSM, ref hwnd)) == STS.SUCCESS)
{
Session.State = STATE.S2;
Session._hwnd = IntPtr.Zero;
Session._entryPoint = default;
Session.State = STATE.S2;
}
return rc;
}

19
src/NTwain/TwainSession.cs
View File

@@ -6,7 +6,7 @@ using TWAINWorkingGroup;
namespace NTwain
{
// this file contains initialization-related things.
// this file contains initialization/cleanup things.
public partial class TwainSession
{
@@ -83,5 +83,22 @@ namespace NTwain
DGImage = new DGImage(this);
DGAudio = new DGAudio(this);
}
internal IntPtr _hwnd;
/// <summary>
/// Tries to bring the TWAIN session down to some state.
/// </summary>
/// <param name="targetState"></param>
/// <returns>The final state.</returns>
public STATE TryStepdown(STATE targetState)
{
if (State > targetState)
{
// shouldn't care about handle when closing really
DGControl.Parent.CloseDSM(ref _hwnd);
}
return State;
}
}
}