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File operations in loadrunner with examples

In this post I will explain how to capture a value from server response and save to a text file using vugen.

How to capture and save to text file using loadrunner:

First I have recorded the script using and then i searched for IBM. We will get 10 results. I have captured all the 10 values and saved to a file.

Here is the code for that.

    long fp;---Here I have declared fp to store the buffer that captured.
    int i;
    char *SearchValue;
    char ch[1000];

        "RecContentType=text/html", ----------

        "LB/IC=< h2 >=\"",

        SearchValue = lr_paramarr_idx("c_search", i);

Hope, most of the code is self explanatory. If you have any doubts feel free to leave a comment.


  1. i am very new to performance testing..can u please explain each and every line of the above written code.thanks

    1. Hi,

      I suggest you to learn c language and loadrunner and web functions which will help you a lot in understanding the code.

    2. hi sam thanks for your suggestion.yes i do know some basics of c but as you are asking me to learn web functions can i know where can we find these functions as an api so that i can go through.

    3. Download and Install the loadrunner
      and in the help section you will find all the function reference.
      go through following functions
      Loadrunner Functions - which will start with lr_ -
      Web Functions - which will start with web_ -

    4. Thanks a lot i am going through.

  2. Just what I needed Sam, thank you!

  3. Hi Sam,
    Thanks a lot, this helped. I have an additional question on this: how do you combine the iterations results in a file? For ex: I am trying to run two users (i.e. two iterations in VuGen) but I can only see last user's correlated values. How do we not overwrite values in a file? I want to have both users' data in a file if I run 2 iterations.
    Thank you.

  4. Your comment on line:
    long fp;---Here I have declared fp to store the buffer that captured.

    fp is not for storing the buffer that captured. It is declared as a file pointer, which is used to "walk" the file.

  5. Why was the below declaration done ?

    char ch[1000];

  6. Why was the below declaration done?
    char ch[1000]; ??


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