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  1. #16
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
    Join Date
    Dec 2012

    Re: Using npcap libs to save packet causes memory fault

    The in parameter requires a 16-bit number in TCP/IP network byte order. As the cast is from char* to u-short* the order of bytes ptrCurrent_Field[0] and ptrCurrent_Field[1] is important and isn't dealt with by ntoh().
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++23 Compiler: Microsoft VS2022 (17.6.5)

  2. #17
    Join Date
    Mar 2023

    Re: Using npcap libs to save packet causes memory fault

    shortTTL = ntohs(*((u_short*)ptrCurrent_Field));

    ...worked and it looks neater than the workaround I used. Thanks a lot to all who replied. It gives me a pointer (pun intended) for something to learn more about.

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