Release Pos printer while catch PosControlException

Question

Dear All,

         Please have a look at the following code. Can I release the printer while PosControlException occurs? What will happen if I do that?

Dim posExplorer As New PosExplorer()
Dim deviceInfo As DeviceInfo = Nothing
deviceInfo = posExplorer.GetDevice(DeviceType.PosPrinter, PrinterName)
pr = posExplorer.CreateInstance(deviceInfo)   
pr.Open()
Try   
	pr.Claim(10000)
Catch e As PosControlException
	Try
		pr.Release()
	Catch ex As Exception
		Throw e
	End Try
	Throw e
Catch e As Exception
....
End Try

Thanks

Answer 1

If you get an error on a claim in the service object, I would guess the device was never claimed, thus release is redundant. It can't hurt.

-Sean

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www.sjjmicro.com / www.seanliming.com / www.annabooks.com, Book Author - Pro Guide to WES 7, XP Embedded Advanced, Pro Guide to POS for .NET

Answer 2

Hi, Sean Liming,

  Sometimes, I got an exception message:The port is already open. Why will I see the message? Could you tell me the reason?

Answer 3

On which error message? Claim or Release?

-Sean

---

www.sjjmicro.com / www.seanliming.com / www.annabooks.com, Book Author - Pro Guide to WES 7, XP Embedded Advanced, Pro Guide to POS for .NET

Answer 4

On which error message? Claim or Release?

-Sean

---

www.sjjmicro.com / www.seanliming.com / www.annabooks.com, Book Author - Pro Guide to WES 7, XP Embedded Advanced, Pro Guide to POS for .NET

Claim, thanks