• LoadRunner VuGen: What’s Up With SPRINTF?

    Posted on May 27, 2009 by Admin

    In my custom load testing class, we usually get into specific code examples that demonstrate how to do some tips and tricks in VUGen. One of the things I always like to bring up is the behavior or sprintf. This is a commonly used C function for string manipulation. Many a young LoadRunner lad has come across the dreaded memory violation error in their output log when using sprintf:
    Error: C interpreter run time error: Action.c (10): Error — memory violation : Exception ACCESS_VIOLATION received.
    Let’s look at why. Here is some code: Read Entire Entry

  • LoadRunner VuGen: Fixing Corrupted Winsock Libraries

    Posted on May 25, 2009 by Admin

    I was trying out the new Protocol Advisor in LoadRunner 9.5 this week, and I found it was not working as advertised. It wasn’t even recommending WEB as a protocol choice for recording a simple web script. Not good. The only thing it did recommend to me properly was RDP. If a person cannot figure out they are using RDP when they launch an RDP window, they probably should not be using LoadRunner. 🙂 I decided to dig a bit deeper and found I had discovered a bigger problem.

    On my past several engagements, I had been using the client Read Entire Entry

  • VuGen: Dynamic data in web_submit_data

    Posted on May 5, 2009 by Admin

    This was developed as a result of load testing a bridal registry site written with BlueMartini. There needed to be a way for the Vuser to clean up its bridal registry at the end of each iteration. However, I couldn’t be assured of a specific number of items (because the item catalog changed frequently, and we varied the number of items added).

    The web_submit_data function looks for a symbolic “LAST” to determine when it has reached the end of a variable argument list. This was modified by inserting it into a predefined argumen Read Entire Entry