This started happening a couple of days ago: (console app, debug mode) compiles and links ok, but then I hit F4 to start debugging, and as soon as I hit F8 so that it should stop at first instruction, it says "Program Ended".  How can this be?


sc main.cpp -cpp -Ae -Ar -mn -C -WA -S -5 -a8 -c -gf -DCONSOLE=1 -D_DEBUG=1
-D_X86_=1 -D_MT=1 -D_MBCS=1 -IG:\dm\stlport\stlport -IG:\dm\include
-IG:\boost-1.30.2 -IG:\boost-1.30.2\boost -oG:\BACnet\RS485\test\main.obj
sc ..\Serial.cpp -cpp -Ae -Ar -mn -C -WA -S -5 -a8 -c -gf -DCONSOLE=1 -D_DEBUG=1
-D_X86_=1 -D_MT=1 -D_MBCS=1 -IG:\dm\stlport\stlport -IG:\dm\include
-IG:\boost-1.30.2 -IG:\boost-1.30.2\boost -oG:\BACnet\RS485\test\Serial.obj
sc ..\rs485.cpp -cpp -Ae -Ar -mn -C -WA -S -5 -a8 -c -gf -DCONSOLE=1 -D_DEBUG=1
-D_X86_=1 -D_MT=1 -D_MBCS=1 -IG:\dm\stlport\stlport -IG:\dm\include
-IG:\boost-1.30.2 -IG:\boost-1.30.2\boost -oG:\BACnet\RS485\test\rs485.obj
sc ..\xeiver.cpp -cpp -Ae -Ar -mn -C -WA -S -5 -a8 -c -gf -DCONSOLE=1 -D_DEBUG=1
-D_X86_=1 -D_MT=1 -D_MBCS=1 -IG:\dm\stlport\stlport -IG:\dm\include
-IG:\boost-1.30.2 -IG:\boost-1.30.2\boost -oG:\BACnet\RS485\test\xeiver.obj
sc ..\..\TIME\mm_timer.cpp -cpp -Ae -Ar -mn -C -WA -S -5 -a8 -c -gf -DCONSOLE=1
-D_DEBUG=1 -D_X86_=1 -D_MT=1 -D_MBCS=1 -IG:\dm\stlport\stlport -IG:\dm\include
-IG:\boost-1.30.2 -IG:\boost-1.30.2\boost -oG:\BACnet\RS485\test\mm_timer.obj
sc ..\..\VARS\variables.cpp -cpp -Ae -Ar -mn -C -WA -S -5 -a8 -c -gf -DCONSOLE=1
-D_DEBUG=1 -D_X86_=1 -D_MT=1 -D_MBCS=1 -IG:\dm\stlport\stlport -IG:\dm\include
-IG:\boost-1.30.2 -IG:\boost-1.30.2\boost -oG:\BACnet\RS485\test\variables.obj
sc ..\..\VARS\params.cpp -cpp -Ae -Ar -mn -C -WA -S -5 -a8 -c -gf -DCONSOLE=1
-D_DEBUG=1 -D_X86_=1 -D_MT=1 -D_MBCS=1 -IG:\dm\stlport\stlport -IG:\dm\include
-IG:\boost-1.30.2 -IG:\boost-1.30.2\boost -oG:\BACnet\RS485\test\params.obj
sc ..\..\REC_FRM\rec_frm.cpp -cpp -Ae -Ar -mn -C -WA -S -5 -a8 -c -gf
-DCONSOLE=1 -D_DEBUG=1 -D_X86_=1 -D_MT=1 -D_MBCS=1 -IG:\dm\stlport\stlport
-IG:\dm\include -IG:\boost-1.30.2 -IG:\boost-1.30.2\boost
-oG:\BACnet\RS485\test\rec_frm.obj
link /CO /NOI /DE /NOPACKF /XN /NT /ENTRY:mainCRTStartup /BAS:4194304 /A:512
@test_serial.LNK
ren G:\BACnet\RS485\test\$SCW$.EXE test_serial.EXE
G:\BACnet\RS485\test\test_serial.EXE built
Lines Processed: 758156  Errors: 0  Warnings: 0
Successful build

Found out part of what's happening: I had something being initialized in static initializations time that triggered a start of the multimedia timer. Getting rid of a static member in a class and turning it into a singleton solve the problem of the debugger mysteriously exiting the program before seeming to step into a single instruction. I can now single step through the code to the point of failure, and the cause is still a mystery:  As soon as the multi-media timer starts running I get the Program Ended message.  Here's the code of my class and the instruction at which the program terminates:


//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

class timer : public iface
{
virtual  void timerProc_() const = 0;
protected:
timer    ( size_t resolution );
virtual ~timer    ();
size_t   getTimerRes () const { return timerRes; };
bool     startTimer  ( size_t period, bool oneShot );
bool     stopTimer   ();
size_t   timerRes;
size_t   timerId;
public:
void     timerProc(){ timerProc_(); }
};
timer::timer(size_t resolution) :
iface(), timerRes(0), timerId(0)
{
TIMECAPS	tc;
if(TIMERR_NOERROR == ::timeGetDevCaps(&tc,sizeof(TIMECAPS)))
{
timerRes = min(max(tc.wPeriodMin,resolution),tc.wPeriodMax);
::timeBeginPeriod(timerRes);
}
}
timer::~timer()
{
stopTimer();
if( timerRes )
{
::timeEndPeriod( timerRes );
timerRes = 0;
}
}
extern "C"
void CALLBACK internalTimerProc(size_t id, size_t msg,
DWORD dwUser, DWORD dw1, DWORD dw2)
{
timer *	tmr = static_cast<timer*>(dwUser);
tmr->timerProc();
}
bool timer::startTimer(size_t period,bool oneShot)
{
bool		res = false;
MMRESULT	result;
//*********************************************************************
result = ::timeSetEvent(period, timerRes, internalTimerProc,
(DWORD)this,oneShot ? TIME_ONESHOT : TIME_PERIODIC); //<-- Program Ends !!!
//*********************************************************************
if(NULL != result)
{
timerId = (size_t)result;
res = true;
}
return res;
}
bool timer::stopTimer()
{
MMRESULT result = TIMERR_NOERROR;
if( timerId )
result = ::timeKillEvent(timerId);
if( result == TIMERR_NOERROR )
timerId = 0;
return( result == TIMERR_NOERROR );
}

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

Cheers!

It just seems that the debugger chokes when the multimedia timer is turned on; the code works okay when compiled for Release...

"dan" <dan_member@pathlink.com> wrote in message news:buk8nj$10jt$1@digitaldaemon.com...
> It just seems that the debugger chokes when the multimedia timer is turned
on;
> the code works okay when compiled for Release...

Try windbg.exe on it.