atoi Giving Problems

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I'm having a problem with this segment of my code, It gives me this error.
Unhandled exception at 0x5518c1a8 (msvcr100d.dll) in Eyeball.exe: 0xC0000005: Access violation reading location 0x525c3a43.

This is the code...

C++

if ((argc>=4) && (strcmp(argv[3], "m")==0))
    more=1;
result = atoi(argv[2]);
packetCount=0;

Posted 27-Aug-11 10:27am

Member 7766180

Updated 27-Aug-11 11:26am

Simon Bang Terkildsen

v2

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Simon Bang Terkildsen · Accepted Answer · 2011-08-27T11:20:00

Solution 1

~~the string you pass to atoi is not null terminated~~

you have less than 3 arguments. You haven't ensured that you have 3 arguments thus result = atoi(argv[2]); might fail.

Stepping through your code line by line, with the debugger, will allow you to find the line that fails and it should be more obvious to you what the reason for the error is.

Posted 27-Aug-11 11:20am

Simon Bang Terkildsen

Updated 27-Aug-11 11:28am

v3

Comments

Member 7766180 27-Aug-11 17:30pm

It fails on the atoi(argv[2]) line. Is there a way to return a 0 if it is null? Would that work? Is there a way to check if it has 3 arguments? Thanks

mbue 27-Aug-11 17:56pm

Yes indeed:
result = 2<argc?atoi(argv[2]):0;
Regards.

Member 7766180 27-Aug-11 18:45pm

Thank you! How can I give you credit? Post as a new solution.