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lr_set_debug_message function in loadrunner with examples

Lr_set_debug_message – One of my favorite lr function in loadrunner. It is mainly useful when we are unable to find correlation value in a particular request.

We usually use Extended log -> Data Returned by Server in Run-time Settings to get all the response in replay log. Sometimes the vugen will crash or becomes slow as the vugen is writing all the response to replay log.

Extended Log in Run-time Settings
Extended Log in Run-time Settings
If it crashes or taking long time to execute the script then it’s better to use lr_set_debug_message instead of using Data Returned by Server.

In the following example we have added data returned by server only to particular request.

Example:

lr_set_debug_message (LR_MSG_CLASS_EXTENDED_LOG | LR_MSG_CLASS_FULL_TRACE, LR_SWITCH_ON);
        web_url("Bing",
        "URL=http://www.bing.com/",
        "Mode=HTML",
        LAST );
lr_set_debug_message (LR_MSG_CLASS_EXTENDED_LOG | LR_MSG_CLASS_FULL_TRACELR_SWITCH_OFF);


lr_set_debug_message can also be written in the following way:

Declare in globals the following way and call wherever required.


#ifndef _GLOBALS_H
#define _GLOBALS_H
//--------------------------------------------------------------------
//Include Files
 #include "lrun.h"
#include "web_api.h"
#include "lrw_custom_body.h"
//Global Variables
Extended_Log_On()
{
lr_set_debug_message (LR_MSG_CLASS_EXTENDED_LOG | LR_MSG_CLASS_FULL_TRACELR_SWITCH_ON);
return 0;
}
Extended_Log_Off()
{
lr_set_debug_message (LR_MSG_CLASS_EXTENDED_LOG | LR_MSG_CLASS_FULL_TRACELR_SWITCH_OFF);
return 0;
}
#endif // _GLOBALS_H

Action Part Started Here:

Action()
{
    Extended_Log_On();
       web_url("Bing",
        "URL=http://news.google.com/",
        "Mode=HTML",
        LAST );
     Extended_Log_On();
     return 0;
}

There are mainly three setting for message logging. The second table is used to further refine the message logging.

Log LevelC LanguageConstantsValue
DisabledLR_MSG_CLASS_DISABLE_LOG0
BriefLR_MSG_CLASS_BRIEF_LOG1
Extended Log LR_MSG_CLASS_EXTENDED_LOG16

Log LevelC Language ConstantsValue
Result DataLR_MSG_CLASS_RESULT_DATA2
Parameter SubstitutionLR_MSG_CLASS_PARAMETERS4
Full Run-Time Trace LR_MSG_CLASS_FULL_TRACE 8

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lr_abort Stops the script execution.lr_advance_param It will take the next value in the parameter list.lr_continue_on_error Continue on error even if the request is failed.lr_convert_string_encoding Converts a string to a UTF 8 or Unicode.lr_db_dataset_action Validates database contents by setting checkpoints.lr_db_connect Connects to a database.lr_db_dataset_action Performs an action on a dataset.lr_db_disconnect Disconnects from a database.lr_db_executeSQLStatement Submits an SQL statement to a database.lr_checkpoint Validates the value of a parameter against an expected value (checkpoint).lr_db_getValue Retrieves a value from a dataset.lr_debug_message Sends a debug message to the LoadRunner output or Application Management agent log file.lr_decrypt Decrypts an encoded string.lr_disable_ip_spoofing Disables IP Spoofing.lr_enable_ip_spoofing Enables IP Spoofing.lr_end_sub_transaction Marks the end of a sub-transaction.lr_end_transaction Mark…