/// <summary>
/// Rollback the TWAIN state to whatever is requested...
/// </summary>
/// <param name="a_state"></param>
public void Rollback(TWAIN.STATE a_state)
{
TWAIN.TW_PENDINGXFERS twpendingxfers = default(TWAIN.TW_PENDINGXFERS);
TWAIN.TW_USERINTERFACE twuserinterface = default(TWAIN.TW_USERINTERFACE);
TWAIN.TW_IDENTITY twidentity = default(TWAIN.TW_IDENTITY);
// Make sure we have something to work with...
if (m_twain == null)
{
return;
}
// Walk the states, we don't care about the status returns. Basically,
// these need to work, or we're guaranteed to hang...
// 7 --> 6
if ((m_twain.GetState() == TWAIN.STATE.S7) && (a_state < TWAIN.STATE.S7))
{
m_twain.DatPendingxfers(TWAIN.DG.CONTROL, TWAIN.MSG.ENDXFER, ref twpendingxfers);
}
// 6 --> 5
if ((m_twain.GetState() == TWAIN.STATE.S6) && (a_state < TWAIN.STATE.S6))
{
m_twain.DatPendingxfers(TWAIN.DG.CONTROL, TWAIN.MSG.RESET, ref twpendingxfers);
}
// 5 --> 4
if ((m_twain.GetState() == TWAIN.STATE.S5) && (a_state < TWAIN.STATE.S5))
{
m_twain.DatUserinterface(TWAIN.DG.CONTROL, TWAIN.MSG.DISABLEDS, ref twuserinterface);
}
// 4 --> 3
if ((m_twain.GetState() == TWAIN.STATE.S4) && (a_state < TWAIN.STATE.S4))
{
m_twain.CsvToIdentity(ref twidentity, m_twain.GetDsIdentity());
m_twain.DatIdentity(TWAIN.DG.CONTROL, TWAIN.MSG.CLOSEDS, ref twidentity);
}
// 3 --> 2
if ((m_twain.GetState() == TWAIN.STATE.S3) && (a_state < TWAIN.STATE.S3))
{
m_twain.DatParent(TWAIN.DG.CONTROL, TWAIN.MSG.CLOSEDSM, ref m_intptrHwnd);
}
}
/// <summary>
/// Select and open a TWAIN driver...
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void m_buttonOpen_Click(object sender, EventArgs e)
{
string szIdentity;
string szDefault = "";
string szStatus;
List <string> lszIdentity = new List <string>();
FormSelect formselect;
DialogResult dialogresult;
TWAIN.STS sts;
TWAIN.TW_CAPABILITY twcapability;
TWAIN.TW_IDENTITY twidentity = default(TWAIN.TW_IDENTITY);
// Get the default driver...
m_intptrHwnd = this.Handle;
sts = m_twain.DatParent(TWAIN.DG.CONTROL, TWAIN.MSG.OPENDSM, ref m_intptrHwnd);
if (sts != TWAIN.STS.SUCCESS)
{
MessageBox.Show("OPENDSM failed...");
return;
}
// Get the default driver...
sts = m_twain.DatIdentity(TWAIN.DG.CONTROL, TWAIN.MSG.GETDEFAULT, ref twidentity);
if (sts == TWAIN.STS.SUCCESS)
{
szDefault = m_twain.IdentityToCsv(twidentity);
}
// Enumerate the drivers...
for (sts = m_twain.DatIdentity(TWAIN.DG.CONTROL, TWAIN.MSG.GETFIRST, ref twidentity);
sts != TWAIN.STS.ENDOFLIST;
sts = m_twain.DatIdentity(TWAIN.DG.CONTROL, TWAIN.MSG.GETNEXT, ref twidentity))
{
lszIdentity.Add(m_twain.IdentityToCsv(twidentity));
}
// Ruh-roh...
if (lszIdentity.Count == 0)
{
MessageBox.Show("There are no TWAIN drivers installed on this system...");
return;
}
// Instantiate our form...
formselect = new FormSelect(lszIdentity, szDefault);
formselect.StartPosition = FormStartPosition.CenterParent;
dialogresult = formselect.ShowDialog(this);
if (dialogresult != System.Windows.Forms.DialogResult.OK)
{
m_blExit = true;
return;
}
// Get all the identities...
szIdentity = formselect.GetSelectedDriver();
if (szIdentity == null)
{
m_blExit = true;
return;
}
// Get the selected identity...
m_blExit = true;
foreach (string sz in lszIdentity)
{
if (sz.Contains(szIdentity))
{
m_blExit = false;
szIdentity = sz;
break;
}
}
if (m_blExit)
{
return;
}
// Make it the default, we don't care if this succeeds...
twidentity = default(TWAIN.TW_IDENTITY);
m_twain.CsvToIdentity(ref twidentity, szIdentity);
m_twain.DatIdentity(TWAIN.DG.CONTROL, TWAIN.MSG.SET, ref twidentity);
// Open it...
sts = m_twain.DatIdentity(TWAIN.DG.CONTROL, TWAIN.MSG.OPENDS, ref twidentity);
if (sts != TWAIN.STS.SUCCESS)
{
MessageBox.Show("Unable to open scanner (it is turned on and plugged in?)");
m_blExit = true;
return;
}
// Update the main form title...
this.Text = "TWAIN C# Scan (" + twidentity.ProductName.Get() + ")";
// Strip off unsafe chars. Sadly, mono let's us down here...
m_szProductDirectory = CSV.Parse(szIdentity)[11];
foreach (char c in new char [41]
{
'\x00', '\x01', '\x02', '\x03', '\x04', '\x05', '\x06', '\x07',
'\x08', '\x09', '\x0A', '\x0B', '\x0C', '\x0D', '\x0E', '\x0F', '\x10', '\x11', '\x12',
'\x13', '\x14', '\x15', '\x16', '\x17', '\x18', '\x19', '\x1A', '\x1B', '\x1C', '\x1D',
'\x1E', '\x1F', '\x22', '\x3C', '\x3E', '\x7C', ':', '*', '?', '\\', '/'
}
)
{
m_szProductDirectory = m_szProductDirectory.Replace(c, '_');
}
// We're doing memory transfers...
szStatus = "";
twcapability = default(TWAIN.TW_CAPABILITY);
m_twain.CsvToCapability(ref twcapability, ref szStatus, "ICAP_XFERMECH,TWON_ONEVALUE,TWTY_UINT16,TWSX_MEMORY");
sts = m_twain.DatCapability(TWAIN.DG.CONTROL, TWAIN.MSG.SET, ref twcapability);
if (sts != TWAIN.STS.SUCCESS)
{
m_blExit = true;
return;
}
// Decide whether or not to show the driver's window messages...
szStatus = "";
twcapability = default(TWAIN.TW_CAPABILITY);
m_twain.CsvToCapability(ref twcapability, ref szStatus, "CAP_INDICATORS,TWON_ONEVALUE,TWTY_BOOL," + (m_blIndicators ? "TRUE" : "FALSE"));
sts = m_twain.DatCapability(TWAIN.DG.CONTROL, TWAIN.MSG.SET, ref twcapability);
if (sts != TWAIN.STS.SUCCESS)
{
m_blExit = true;
return;
}
// New state...
SetButtons(EBUTTONSTATE.OPEN);
// Create the setup form...
m_formsetup = new FormSetup(this, ref m_twain, m_szProductDirectory);
}