/// <summary>
/// Returns one packet of Wintab data from the packet queue.
/// </summary>
/// <param name="hCtx_I">Wintab context to be used when asking for the data</param>
/// <param name="pktID_I">Identifier for the tablet event packet to return.</param>
/// <returns>Returns a data packet with non-null context if successful.</returns>
public WintabPacket GetDataPacket(HCTX hCtx_I, UInt32 pktID_I)
{
IntPtr buf = CMemUtils.AllocUnmanagedBuf(Marshal.SizeOf(typeof(WintabPacket)));
WintabPacket packet = new WintabPacket();
if (pktID_I == 0)
{
throw new Exception("GetDataPacket - invalid pktID");
}
CheckForValidHCTX("GetDataPacket");
if (CWintabFuncs.WTPacket(hCtx_I, pktID_I, buf))
{
packet = (WintabPacket)Marshal.PtrToStructure(buf, typeof(WintabPacket));
}
else
{
//
// If fails, make sure context is zero.
//
packet.pkContext = HCTX.Zero;
}
CMemUtils.FreeUnmanagedBuf(buf);
return(packet);
}
/// <summary>
/// Returns one packet of Wintab data from the packet queue.
/// </summary>
/// <param name="hCtx_I">Wintab context to be used when asking for the data</param>
/// <param name="pktID_I">Identifier for the tablet event packet to return.</param>
/// <returns>Returns a data packet with non-null context if successful.</returns>
public WintabPacket GetDataPacket(UInt32 hCtx_I, UInt32 pktID_I)
{
IntPtr buf = CMemUtils.AllocUnmanagedBuf(Marshal.SizeOf(typeof(WintabPacket)));
WintabPacket packet = new WintabPacket();
if (pktID_I == 0)
{
throw new Exception("GetDataPacket - invalid pktID");
}
CheckForValidHCTX("GetDataPacket");
if (CWintabFuncs.WTPacket(hCtx_I, pktID_I, buf))
{
packet = (WintabPacket)Marshal.PtrToStructure(buf, typeof(WintabPacket));
}
else
{
//
// If fails, make sure context is zero.
//
packet.pkContext = 0;
}
/**
* PERFORMANCE FIX: without this line, the memory consume of .NET apps increase
* exponentially when the PEN is used for long time (or worse when the pen is leaved alone on the tablet screen)
* causing the app to crash now or later...
* Author: Alessandro del Gobbo ([email protected])
*/
CMemUtils.FreeUnmanagedBuf(buf);
return(packet);
}
/// <summary>
/// Returns one packet of WintabPacketExt data from the packet queue.
/// </summary>
/// <param name="hCtx_I">Wintab context to be used when asking for the data</param>
/// <param name="pktID_I">Identifier for the tablet event packet to return.</param>
/// <returns>Returns a data packet with non-null context if successful.</returns>
public WintabPacketExt GetDataPacketExt(UInt32 hCtx_I, UInt32 pktID_I)
{
int size = (int)(Marshal.SizeOf(new WintabPacketExt()));
IntPtr buf = CMemUtils.AllocUnmanagedBuf(size);
WintabPacketExt[] packets = null;
try
{
bool status = false;
if (pktID_I == 0)
{
throw new Exception("GetDataPacket - invalid pktID");
}
CheckForValidHCTX("GetDataPacket");
status = CWintabFuncs.WTPacket(hCtx_I, pktID_I, buf);
if (status)
{
packets = CMemUtils.MarshalDataExtPackets(1, buf);
}
else
{
// If fails, make sure context is zero.
packets[0].pkBase.nContext = 0;
}
}
catch (Exception ex)
{
MessageBox.Show("FAILED GetDataPacketExt: " + ex.ToString());
}
/**
* PERFORMANCE FIX: without this line, the memory consume of .NET apps increase
* exponentially when the PEN is used for long time (or worse when the pen is leaved alone on the tablet screen)
* causing the app to crash now or later...
* Author: Alessandro del Gobbo ([email protected])
*/
CMemUtils.FreeUnmanagedBuf(buf);
return(packets[0]);
}
/// <summary>
/// Returns one packet of WintabPacketExt data from the packet queue.
/// </summary>
/// <param name="hCtx_I">Wintab context to be used when asking for the data</param>
/// <param name="pktID_I">Identifier for the tablet event packet to return.</param>
/// <returns>Returns a data packet with non-null context if successful.</returns>
public WintabPacketExt GetDataPacketExt(HCTX hCtx_I, UInt32 pktID_I)
{
int size = (int)(Marshal.SizeOf(new WintabPacketExt()));
IntPtr buf = CMemUtils.AllocUnmanagedBuf(size);
WintabPacketExt[] packets = null;
try
{
bool status = false;
if (pktID_I == 0)
{
throw new Exception("GetDataPacket - invalid pktID");
}
CheckForValidHCTX("GetDataPacket");
status = CWintabFuncs.WTPacket(hCtx_I, pktID_I, buf);
if (status)
{
packets = CMemUtils.MarshalDataExtPackets(1, buf);
}
else
{
// If fails, make sure context is zero.
packets[0].pkBase.nContext = HCTX.Zero;
}
}
catch (Exception ex)
{
MessageBox.Show("FAILED GetDataPacketExt: " + ex.ToString());
}
CMemUtils.FreeUnmanagedBuf(buf);
return(packets[0]);
}
