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Division By Zero Exception

Posted on 1997-02-17
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Last Modified: 2012-05-04
How I can implement a Division By Zero exception handling into a DLL function using Borland C/C++ 5.01 both for 32 and 16 bit environment.

Many Thansk.
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Question by:erve
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11 Comments
 

Expert Comment

by:looney
ID: 1161991
All I can suggest is using try / catch blocks in your code to handle any errors if they occur.
try
{
pWebInterface_i->writeBack( genBrowseScreen() );
            }
            catch(IKStackException * /*pException*/)
              {
                  //pException->addFunctionInfo("KService::addSession");
                    //comStackException(pException);
               }
               catch(IKAPIException * /*pException*/ )
               {
                  printf("error\n");
                    //comAPIException(pException);
               }
               catch(long int)
               {
                  printf("error\n");
                    //comMemException();
               }
            catch(...)
               {
                  DWORD lastError_i = GetLastError();
                  printf("error\n");
                  //KAPIException *pAPIException = new KAPIException( CLIENT_UNKNOWN_KERRORCODE_APIEXCEPTION );         
          }

Are you looking for some function like _set_new_handler but for divide by zero errors. I don't think one exists.

Tom.
0
 

Expert Comment

by:looney
ID: 1161992
Sorry about the last posting , hit the wrong key combination ...

All I can suggest is using try / catch blocks in your code to handle any errors if they occur.

try
{
   divide by zero code;
}
catch(...)
{
   handle error
}

Are you looking for some function like _set_new_handler but for divide by zero errors. I don't think one exists.

Tom.
0
 

Author Comment

by:erve
ID: 1161993
I have already tryed this kind of solution, but not work.


0
 

Expert Comment

by:looney
ID: 1161994
Did you use the (...) notation for the catch statment ?

0
 

Author Comment

by:erve
ID: 1161995
Yes, I use catch(...)
0
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Author Comment

by:erve
ID: 1161996

0
 
LVL 23

Accepted Solution

by:
chensu earned 200 total points
ID: 1161997
Use the Toolhelp function: InterruptRegister(). The Tool Helper library supports INT_DIV0 (Divide-error exception). Please check with online help for more details.

0
 

Author Comment

by:erve
ID: 1161998
You have some example ?
0
 
LVL 23

Expert Comment

by:chensu
ID: 1161999
You can check with Microsoft Visual C++ 1.x/Samples/Toolhelp/Thsample.c.

0
 
LVL 23

Expert Comment

by:chensu
ID: 1162000
You can also check with the book by Jim Conger from The Waite Group: Windows API New Testament.

0
 

Expert Comment

by:mar10
ID: 1162001
try this:

--- start of example

// needs:
#include <float.h>
#include <signal.h>

typedef void (*SigHandler_T) (int);

// FPE Handler:
void cbSigFPE (int* piRegs)
{
    int iType = ( *((int*)&piRegs+1) );       // FPE_... defined in float.h
    // ...
    signal (SIGFPE, (SigHandler_T)cbSigFPE);  //  reinstall signal handler
}

// install FPE handler:
signal (SIGFPE, (SigHandler_T)cbSigFPE);

--- end of example

Don't use C++ runtime lib funks in signal handlers (semaphore deadlock might occur)

You may also mask out FPEs:
    UINT uExcpt = EM_INVALID|EM_DENORMAL|EM_ZERODIVIDE|EM_OVERFLOW|EM_UNDERFLOW|EM_INEXACT;
    _control87 (uExcpt, MCW_EM);

martin wendt
0

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