On Fri, 21 Apr 2000 15:03:24 -0700, <[EMAIL PROTECTED]> wrote:
>Hi there,
> I've been racking my brain trying to get a ReadProc which will work when
>receiving a database which has been sent via ExgDBWrite. Does anyone have
>any suggestions where I might find some sample code for a viable ReadProc?
>Thanks,
> Chris Gilmore
I just happen to have some. I also have a vague recollection of having seen some more
authorative sample code on the Web somewhere, but at the moment, can't find it.
Note that the following is actually C++ code, though it could clearly just as easily
be plain C. showError() is a trivial error-reporting function, not shown.
If some expert out there sees anything wrong with the code or comments here, we would
all appreciate comment.
// FUNCTION: receiveBeam
//
// The application has been launched in order to respond to Exchange
// Manager input (beamed data). It should be a database for our app,
// which we will duly receive and write out.
//
void
receiveBeam(ExgSocketType* pSocket, UInt16 launchFlags)
{
// There's a launchFlags bit that tells us whether we were already
// active at the time the beam came in. We can't receive a
// database under those circumstances, as it will very likely land
// on top of the currently open database. But also note that,
// when that flag *isn't* set, our global variables are not
// available.
//
if (launchFlags & sysAppLaunchFlagSubCall) {
showError("Can't receive a database when application is running");
return;
}
ASSERT(pSocket != NULL);
// ExgDBRead does essentially everything.
//
LocalID whoCaresWhatDBID;
Boolean noDontReset;
if (ExgDBRead(
exgReadProc,
exgDeleteProc,
pSocket,
&whoCaresWhatDBID,
0, // Card number
&noDontReset,
true) != 0)
{
showError("Failed to create beamed database");
}
}
// Function: exgReadProc
//
// The ReadProc for receiveBeam. See documentation of ExgDBRead.
//
Err
exgReadProc(void* pData, UInt32* pSize, void* pUserData)
{
ExgSocketType* pSocket = static_cast<ExgSocketType*>(pUserData);
Err e;
*pSize = ExgReceive(pSocket, pData, *pSize, &e);
return e;
}
// Function: exgDeleteProc
//
// The DeleteProc for receiveBeam. See documentation of ExgDBRead.
//
// In contrast to exgReadProc, there's room in this function for the
// exercise of some intelligence. We forgo that opportunity and
// simply do our best to delete the existing database.
//
Boolean
exgDeleteProc(const char* /*pName*/, UInt16 /*version*/, UInt16 cardNo,
LocalID dbID, void* /*pUserData*/)
{
if (DmDeleteDatabase(cardNo, dbID) == 0)
return true;
else {
showError("Unable to delete existing database");
return false;
}
}
--Greg Lutz
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