I want to summarize the role of function keys in Windows Mobile, former Pocket PC, as I got several questions each week on how to use or enable Function keys in this or that application.
Here is a simple information about how function keys work in Windows Mobile.
Continue reading ‘Windows Mobile – the no-go world of Function Keys’ »
This is an update to my btPrint4 android application. The app now supports ‘printing’ of files. You are no longer tied to the provided demo files. ‘Printing’ here means it sends the file as is to the printer. So, watch your step and do not send files that your printer does not understand.
Added a file browser activity: a class named item to hold file informations, a FileChooser class and a FileArrayAdapter. Then the needed layout files are added.
Continue reading ‘Android development: btPrint4 prints demos and files to Bluetooth receipt and label printers’ »
This is the description of my btPrint demo app to print demo files to portable bluetooth label/receipt printers. I already did the same app for android and now wanted to do the same for windows phone 8.
The app starts with the main screen where you select a bluetooth printer, connect, select a demo file and let it print.
Continue reading ‘Windows Phone 8: print demo for bluetooth label/receipt printers’ »
As I needed a tool to test the maximum MTU size for a network, I needed a ping tool where I can define the packet size and the DF (Do Not Fragment-Flag). As I did not find such a tool, I wrote PingNG.
It is a simple tool but the code had to avoid some pitfalls.
Continue reading ‘Mobile Development: PingNG-the next generation ping’ »
An android label/receipt printing app for TCP/IP connected printers
This app is based on my btPrint4 app. In contrast to btPrint4 this time we print on TCP/IP connected printers to port 9100.
As with btPrint4 we have a main activity and one to list available printers and one to list available demo files.
The challenge with ipPrint4 was a replacement for the bluetooth device discovery. This time we have to scan TCP/IP address range for port 9100. This port is also called HP direct printing port and supported by many printers. It behaves similar to telnet and you can just send print commands to the interface.
The second main change to btPrint4 was the printing code. This time we do not have to use a bluetooth socket but a network TCP/IP socket.
A TCP/IP portscanner
If you scan a range of IP addresses in sequence and try to open a port with a timeout of, let’s say 200ms, the scan will take (200msx254, scan from 1 to 254) 50 seconds.
Port scan code Continue reading ‘android: ipPrint4 print label/receipts to ip printer’ »