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Window Services

Posted on 2007-10-17
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Last Modified: 2010-04-13
My window application service is not running normally. Sometime it quits during the run. Is there
way to log its status so that I can find where the service quits. The program is written in Visual C++, running under Window server 2003, eventhough I use catch(...) in the exception handler , but I stil don't receive any messages.
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Question by:xtran888
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jkr earned 2000 total points
ID: 20093249
Check out http://support.microsoft.com/default.aspx?scid=kb%3ben-us%3b170738 ("Debugging a Windows NT Service"), this should help you locate the error. An altrenative method is to use a map file and an exception filter to locate the faulting function. Consider e.g.

#include <windows.h>
#include <stddef.h>
#include <stdio.h>

LONG
WINAPI
ExceptionHandler(LPEXCEPTION_POINTERS pe) {

    char acModule[MAX_PATH];

    MEMORY_BASIC_INFORMATION mbi;
    HMODULE hMod;

    VirtualQuery (pe->ExceptionRecord->ExceptionAddress,&mbi,sizeof(mbi));

    ptrdiff_t RVA = (char*)pe->ExceptionRecord->ExceptionAddress - (char*)mbi.AllocationBase;

    hMod = (HMODULE) mbi.AllocationBase;

    GetModuleFileName(hMod,acModule,sizeof (acModule));

    printf( "Detected Exception in %s at RVA 0x%08X\n", acModule, RVA);

    return EXCEPTION_EXECUTE_HANDLER;
}

void FaultingFunction () {

    LONG* p = NULL;
    *p = 42;
}

void main(){

    SetUnhandledExceptionFilter (ExceptionHandler);
    FaultingFunction ();
}

(compiled with "cl rvaxcept.cpp /link /map")

which prints

Detected Exception in C:\tmp\cc\rvaxcept.exe at RVA 0x00001088

The map file is

rvaxcept

Timestamp is 44660958 (Sat May 13 18:29:12 2006)

Preferred load address is 00400000

Start         Length     Name                   Class
0001:00000000 00004938H .text                   CODE
[...]

 Address         Publics by Value              Rva+Base     Lib:Object

0001:00000000       _ExceptionHandler@4        00401000 f   rvaxcept.obj
0001:0000007a       _FaultingFunction          0040107a f   rvaxcept.obj
0001:00000092       _main                      00401092 f   rvaxcept.obj
0001:000000a7       _printf                    004010a7 f   LIBC:printf.obj
0001:000000d8       _mainCRTStartup            004010d8 f   LIBC:crt0.obj
0001:000001b7       __amsg_exit                004011b7 f   LIBC:crt0.obj
[...]

You can see the 'Rva+Base' column, base is given as 'Preferred load address is 00400000'

Add that to the faulting module RVA of 0x00001088 and you get 0x00401088, then look that up in the above (i.e. the 'nearest symbol' and you can see that it is 'FaultingFunction'

0001:0000007a       _FaultingFunction          0040107a f   rvaxcept.obj
0001:00000092       _main                      00401092 f   rvaxcept.obj

The address is between main and FaultingFunction, which starts before 0x00401088, the next function is main and starts later.

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