InTheHand bluetooth

[Paul]

Hello,

I tried the InTheHand free software to connect my pda to a gps
receiver.

The pda is a WorkAbout Pro of PsionTeklogix. I asked them which stack
the bluetooth module uses, but have no answer yet. It is probably
Microsoft Stack (if someone knows the answer, also please let me know).

A testprogram calls these functions :

InTheHand.Net.Sockets.BluetoothClient inTheHandBluetoothClient = new
InTheHand.Net.Sockets.BluetoothClient();

InTheHand.Net.Sockets.BluetoothDeviceInfo[]
inTheHandBluetoothDeviceInfo =
inTheHandBluetoothClient.DiscoverDevices(1);

which causes an exception (trying to communicate whith a bluetooth gps
receiver) :

An unhandled exception of type 'System.NullReferenceException' occurred
in InTheHand.Net.Bluetooth.dll.

When try this code with an Asus pda (which uses a WidCom stack, so it
is normal that it doesnot work here), there is no crash; the device is
simply not detected apparently (the DiscoverDevices function returns
immediately).
This is an indication for me that the PsionTeklogix pda might use a
microsoft stack, since the result of the test is different.

Thanks for any help to make this work for me,

Paul

 

[Peter Foot [MVP]]

Before creating an instance of BluetoothClient call
BluetoothRadio.PrimaryRadio and check that it returns a BluetoothRadio
instance not null. If it doesn't return a valid BluetoothRadio object then
this means it doesn't use the microsoft stack.

Peter

 

[DirkS]

Before creating an instance of BluetoothClient call
BluetoothRadio.PrimaryRadio and check that it returns a BluetoothRadio
instance not null. If it doesn't return a valid BluetoothRadio object then
this means it doesn't use the microsoft stack.

Peter

Peter, I am using a Psion Teklogix device with WinCE4.2 installed on
it.
The NullReferenceException also occurs with this device, when
performing a device scan.
So I followed your advice:

Dim btRadio As BluetoothRadio
btRadio = BluetoothRadio.PrimaryRadio

....which causes a NullReferenceException.

How can I determine in another way which stack is used and do you have
a link to how the (bluetooth) stack works? I'm a beginner with the
bluetooth story but we will be using it a lot in the future, so any
tips (for beginners) are more than welcome!

 

[Paul]

Hello Peter,

I tried what you wrote :
BluetoothRadio primaryradio = BluetoothRadio.PrimaryRadio;

It does not return a null reference, but causes an exception saying :
"An unhandled exception of type 'System.NullReferenceException'
occurred".
Do you have an explanation for this behaviour ?

Thanks,

Paul


Peter Foot [MVP] schreef:

Before creating an instance of BluetoothClient call
BluetoothRadio.PrimaryRadio and check that it returns a BluetoothRadio
instance not null. If it doesn't return a valid BluetoothRadio object then
this means it doesn't use the microsoft stack.

Peter

--
Peter Foot
Windows Embedded MVP
www.peterfoot.net | www.inthehand.com

Hello,

I tried the InTheHand free software to connect my pda to a gps
receiver.

The pda is a WorkAbout Pro of PsionTeklogix. I asked them which stack
the bluetooth module uses, but have no answer yet. It is probably
Microsoft Stack (if someone knows the answer, also please let me know).

A testprogram calls these functions :

InTheHand.Net.Sockets.BluetoothClient inTheHandBluetoothClient = new
InTheHand.Net.Sockets.BluetoothClient();

InTheHand.Net.Sockets.BluetoothDeviceInfo[]
inTheHandBluetoothDeviceInfo =
inTheHandBluetoothClient.DiscoverDevices(1);

which causes an exception (trying to communicate whith a bluetooth gps
receiver) :

An unhandled exception of type 'System.NullReferenceException' occurred
in InTheHand.Net.Bluetooth.dll.

When try this code with an Asus pda (which uses a WidCom stack, so it
is normal that it doesnot work here), there is no crash; the device is
simply not detected apparently (the DiscoverDevices function returns
immediately).
This is an indication for me that the PsionTeklogix pda might use a
microsoft stack, since the result of the test is different.

Thanks for any help to make this work for me,

Paul