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Set screen Versions & Requirements

  1. VTS has been tested to hold up to 1 million entries per row since the total amount of data the VTS can support is only limited by the OS's maximum limit on process memory (ie. 2GB - 3GB).
  2. However, VTS2 only allows users to scroll to the 32,767th row. VTS3 allows a billion rows.

    At minimum, use at least a 300Mhz+ Windows NT/2000 to run the Virtual Table Server. Since the VTS server component is single threaded, a multi-CPU processor is unnecessary.

    In VTS version 2 “Data extraction and communication was simplified but limited to column/queue level operations. The new Virtual Table Server II provides a higher degree of data manipulation and 5-10 times better performance. From row level queries, retrievals, updates, insertions, unqueue entries, to database access, VTS II provides the functionality and ease for enhanced inter-process, inter-virtual user communication.”

An alternative to VTS is open-source STAF (Software Testing Automation Framework) infrastructure, as described in my page on Automated Testing Frameworksanother page on this site

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Set screen Installation of VTS

  1. VTS3 is loaded by default when LoadRunner is invoked. Get to its UI at http://localhost:4000/
  2. VTS2 requires a separate install Email me to request the folders and files described at the right. (This gives me a way to notify you of future updates).
  3. Unzip into the directory where you want to run VTS.
    Idea My preference is to install where LoadRunner is installed (to avoid messing with PATH variables). The installation zip file's bin contents should go into LoadRunner's bin folder. The same goes for files in the classes, include, and lib folders.
  4. Right-click the vts_start.bat here and save the target file to a local folder, then right-click on it and "Run as Administrator" to register the dlls and invoke vtsconsole. Here are the steps it performs:
    1. In Start > Run enter cmd
      If you're running Windows Vista, Run as Administrator or you'll get error messages about not being able to register.
    2. Navigate your VTS \bin directory, such as:
      cd \
      cd "Program Files\HP\Loadrunner\bin" (V9)
    3. Enter these commands:
      regsvr32.exe vtsctls.ocx
      regsvr32.exe msflxgrd.ocx (MS Flex grid).

      Hopefully, you should see a pop-up "DllRegisterServer in ....ocx succeeded." for each of these commands executed. If instead you get:

      "DllRegisterServer in vtsctls.ocx failed. Return code was: 0x80040200." or
      "DllRegisterServer in msflxgrd.ocx failed. Return code was: 0x8002801c.",

      right-click on it and Run as Administrator.
    4. Before invoking vtsconsole.exe, find its IPv4 address using
      ipconfig /all

      An IP address needs to be specified in the script code calling the vtsconsole. Use "127.0.0.1" if it's on the same machine as the script.
      Another address is needed if VTSConsole is on a different machine.

  5. After you upgrade to a new folder holding LoadRunner (LR7.8 to LR8.0, etc.),
    copy to every LoadRunner host load generator these files:
    • vtclient.dll
      from the VTS \bin folder
      to LoadRunner's \bin folder on the load generator.
    • vts2.h
      from the VTS \include folder
      to LoadRunner's \include folder on the load generator.

Within the zip file:

  • bin
    • comctl32.dll
    • msfixgrd.ocx
    • vtclient32.dll
    • vtclient.dll
    • vtconsole.ext
    • vtsctls.ocx
    • vtserver.dll
    • vtstest.exe
  • classes
    • lrapi
      • lrvtc.class
      • vtc.class
  • dat
    • wrun
      • vtclient
        • db
          • vtclient
          • vtc.class
        • header
        • script
  • doc
    • VTS 2.doc document contains Function references and general usage.
  • include
    • vts2.h
  • info
    • ...
  • lib
    • vtclient32.lib
    • vtclient.lib
    • vtserver.lib
  • VTS_Example_Scripts.zip

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Set screen Scripting Basics

  1. Modify each Vu script that accesses VTS so that the connection to VTS is made only once in the init and end section.
    • Add to the top of every vuser_init, action, and vuser_end section of scripts that use Client VTS API functions

      #include "vts2.h"

    • In the vuser_init section of the script, load the VTS dll, connect to VTS, and specify the column names:
    PVCI pvci = 0; int rc = 0; char VtsServer = "127.0.0.1"; // loopback on the same machine lr_load_dll("vtclient.dll"); // Time out if VtsServer isn't found: pvci = lrvtc_connect( VtsServer,8888,0); rc = vtc_get_last_error(pvci); if( rc != 0 ) { lr_message(" rc = %d for VTC connection to %s.", rc, VtsServer); return -1; }
    • In the vuser_end section of the script:
    PVCI pvci = 0; pvci = lrvtc_disconnect(); Caution! Some LoadRunner examples in the VTS 2.doc VTS User Guide are incorrect!
    The sample script uses "raw" C function calls prefixed with "vtc_" rather than equivalent Loadrunner Vu function calls prefixed with "lrvtc_".
  2. In Action sections of scripts that use VTS, make lrvtc_ function calls. VTC automatically creates column names, so lrvtc_create_column functions are not necessary. int rc = 0; // Insert into the next row the value of a single cell: rc = lrvtc_send_message("Col1", "2"); // Insert into the next row data to several columns: rc = lrvtc_send_row1("Col1;Col2;Col3", "1;John;Me", ";", VTSEND_SAME_ROW ); rc = lrvtc_send_row1("Col1;Col2;Col3", "3;Mary;Too", ";", VTSEND_SAME_ROW ); // Add value into the next column if the value does not already exist: rc = lrvtc_send_if_unique("Col2", "4"); // increments value in Col1 row 2 by 3 (row num starts at 0): rc = lrvtc_increment("Col1", 1, 9);

    Caution! Each function call only replaces the parameters relevant to it, so you may have to clear out parameters if necessary before making different function calls.

    rc = lrvtc_clear_column("Col3"); rc = lrvtc_clear_row(4); VTS provides no indexes, so search though the key column to get its index (variable iRow) then use it to obtain data from other columns in the same row: int colSize; int iRow; char LookFor = "Pam"; // Obtain the count of rows populated for column named "Col1": colSize = lrvtc_column_size("Col1"); lr_message(" Col1 size = %d",colSize); for( iRow = 1; iRow <= colSize; iRow ++ ) { // Retrieve, for the physical row index given, all columns: rc = lrvtc_query_row( iRow ); lr_message("Row %d Col1=%s", iRow, lr_eval_string({Col1})); if (LookFor == lr_eval_string({Col1})){ // Update columns, given the physical row index number: rc = lrvtc_update_row1("Col1;Col2",iRow,"Any;Some",";"); // Retrieve, for the column name given, rows: rc = lrvtc_query_column("Col3", 3); // Update the value in the Column and Row specified: rc = lrvtc_update_message("Col1", iRow , "20"); // Clear value in specified cell given its Column name & Row: rc = lrvtc_clear_message("Col2",iRow); } }
  3. Run the script.

    Error return codes are described biefly in vts2.h are:

    #define VTCERR_INVALID_CONNECTION_INFO -10000 &GT; verify the server name attribute.
    #define VTCERR_FAILED_TO_RESOLVE_ADDR -10001
    #define VTCERR_FAILED_TO_CREATE_SOCKET -10002
    #define VTCERR_FAILED_TO_CONNECT -10003 &GT; the vtconsole is not running.
    #define VTCERR_INCOMPLETE_REQUEST -10100
    #define VTCERR_FAILED_TO_RECV_RESPONSE -10101
    #define VTCERR_INCOMPLETE_RESPONSE -10102
    #define VTCERR_RESPONSE_ARGS_UNMATCH -10103
    #define VTCERR_OPERATION_ERROR_BASE -11000

  4. If VTS has accumulated a set of data you want to keep, from vtsconsole export them to a text file which you can import again later.

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