Shannon,
Thanks for answering. I've looked in the newsgroups and found some
code to use CERapiInitEx. I think I copied it correctly but I'm getting
this error:
Object reference not set to an instance of an object
The code is:
<DllImport("rapi.dll", CharSet:=CharSet.Unicode)> _
Private Shared Function CeRapiInitEx( _
ByVal pRapiInit As RAPIINIT) As Long
End Function
Structure RAPIINIT
Public cbSize As Long
Public heRapiInit As Long
Public hrRapiInit As Long
End Structure
Dim hr As Long
Dim pRapiInit As New RAPIINIT (I TRIED DOING THIS WITH AND WITHOUT NEW)
Dim dwWaitRet, dwTimeout As Long
pRapiInit.cbSize = Len(pRapiInit)
pRapiInit.heRapiInit = 0
pRapiInit.hrRapiInit = 0
hr = E_FAIL
dwWaitRet = 0
dwTimeout = 10 * ONE_SECOND
hr = CeRapiInitEx(pRapiInit) 'THIS IS WHERE IT JUST HANGS
I can't really see how dwWaitRet and dwTimeout get connected to the
CERapiInitEx. I'm assuming that it must be PrAPInit that isn't geting
instantiated correctly but I don't see how.
Thanks for putting up with a newbie.
Neil
[quoted text, click to view] Shannon Lloyd wrote:
> fig000 wrote:
> > Hi,
> >
> > Very new to pocket pcs and net cf. I'm running a small app on my
> > desktop that reads a file from a viewsonic pocket pc. I had gotten
> > CeRapiInit to work with the device connected (and I'm able to read
> > files, etc). I had wanted to set up code to see if the device was
or
> > wasn't connected; I planned to display an error message if the
device
> > wasn't connected so our users would know that no processing had
taken
> > place.
> >
> > What I found was that if the device wasn't connected, instead of
> > returning a code indicating non-success, CeRapiInit just hangs the
> > program. Here's the code:
> >
> > llReturn = CeRapiInit()
> > (llreturn is a long; the code is in vb.net)
> >
> > This is not a deal breaker but annoying. I should be able to see if
the
> > device is connected and put in code to trap that. I'd appreciate
any
> > help.
> >
> > Neil
> >
>
> Have a look at CeRapiInitEx instead. CeRapiInit is a blocking
function,
> so your thread will hang if the device isn't connected. CeRapiInitEx
is
> non-blocking, so the method will return even if the device isn't
> connected. If you have access to it, ".NET Compact Framework
Programming
> with C#" by Yao and Durant has a section devoted to exactly this.
> Shannon
