Android Question astreams.write to print

[mario53]

Taking a code posted by MarcoRome:
https://www.b4x.com/android/forum/threads/usb-ticket-printer-error-when-open-9600-1.61745/

And modified for my needs as follows:

If usb1.UsbPresent(1) = usb1.USB_NONE Then ' Ver_2.4
   Msgbox("No USB device or accessory detected!", "Error") 
   Return
End If
Log("Checking permission 1")
If (usb1.HasPermission(1)) Then ' Ver_2.4
   Msgbox(usb1.DeviceInfo(1),"Info")
   'This is very important - ( VendorId, ProductId )
   usb1.SetCustomDevice(usb1.DRIVER_SILABS, 0x1504, 0x6)

   Dim dev As Int
   dev = usb1.Open(19200, 1)                   ' 
   If dev <> usb1.USB_NONE Then
      Msgbox("Connected successfully! 1","Info")
      astreams1.Initialize(usb1.GetInputStream, usb1.GetOutputStream, "astreams1")
      'This is important
      usb1.SetParameters(19200, usb1.DATABITS_8,usb1.STOPBITS_1, usb1.PARITY_NONE)
      'Here if you want codce that call print
      astreams1.Write("abcde".GetBytes("UTF8"))
      astreams1.Close
      usb1.Close
   Else
     Log("Error opening USB port 1")
   End If
 Else
   usb1.RequestPermission(1) ' Ver_2.4
 End If

It works perfectly up to usb1.SetParameters, when it does: astreams1.Write ( "abcde" .GetBytes ( "UTF8")) There is nothing in the printer
Do you have any idea?
thank you

 

[Erel]

Moved to the questions forum.

Don't close AsyncStreams immediately after you call Write.

Try it like this:

astream1.Write(...)
Sleep(500)
astreams1.Close
usb1.Close

Maybe your printer expects an end of line character after each string?

Try to add:

astream1.Write(...)
astream1.Write(Array As Byte(13, 10))

 

[mario53]

Ok thanks i could print in the thermal printer "abcde";
Now how can you decide size and other control fonts, new page ....

 

[Erel]

Sorry but I'm not familiar with this protocol. If you find any Java code I can help you translate it to B4A.

 

[mario53]

thank you