void timer_Elapsed(object sender, ElapsedEventArgs e)
{
_timer.Interval = 30000;
_timer.Enabled = false;
var foundPrinter = new List <PortInfo> ();
var search = SMPort.SearchPrinter();
foreach (var printer in search)
{
Console.WriteLine(printer.PortName);
Console.WriteLine(printer.ModelName);
Console.WriteLine(printer.MacAddress);
foundPrinter.Add(printer);
}
InvokeOnMainThread(() => {
_printers.Clear();
_printers.AddRange(foundPrinter);
LoadPrinters();
});
_timer.Enabled = true;
}
private static void ReleasePort(SMPort sPort)
{
SMPort.ReleasePort(sPort);
sPort = null;
}
public void Send(string toPrint)
{
//Set the status to offline because this is a new attempt to print
bool onlineStatus = false;
SMPort sPort = null;
//TRY -> Use the textboxes to check if the port info given will connect to the printer.
try
{
//Very important to only try opening the port in a Try, Catch incase the port is not working
sPort = SMPort.GetPort(string.Format("TCP:{0}", _printerAddress), "", 5000);
//GetOnlineStatus() will return a boolean to let us know if the printer was reachable.
onlineStatus = sPort.IsConnected();
}
//CATCH -> If the port information is bad, catch the failure.
catch (Exception ex)
{
if (sPort != null)
{
ReleasePort(sPort);
}
throw new Exception(string.Format("Can not connect to the printer address: {0}", _printerAddress), ex);
}
//If it is offline, dont setup receipt or try to write to the port.
if (onlineStatus == false)
{
ReleasePort(sPort);
throw new Exception("Printer is offline");
}
byte[] dataByteArray = Encoding.UTF8.GetBytes(toPrint);
//Write bytes to printer
uint amountWritten = 0;
while (dataByteArray.Length > amountWritten)
{
//This while loop is very important because in here is where the bytes are being sent out through StarIO to the printer
var amountWrittenKeep = amountWritten;
try
{
unsafe
{
IntPtr unmanagedPointer = Marshal.AllocHGlobal(dataByteArray.Length);
Marshal.Copy(dataByteArray, 0, unmanagedPointer, dataByteArray.Length);
// Call unmanaged code
amountWritten += sPort.WritePort(unmanagedPointer, amountWritten, (uint)dataByteArray.Length - amountWritten);
Marshal.FreeHGlobal(unmanagedPointer);
}
}
catch (Exception)
{
// error happen while sending data
ReleasePort(sPort);
return;
}
if (amountWrittenKeep == amountWritten) // no data is sent
{
SMPort.ReleasePort(sPort);
return; //exit this entire function
}
}
ReleasePort(sPort);
}