C Language of the LoadRunner scripting language

LoadRunnerthe scripting languageClanguage

LoadRunner supports almost all major languages, such as C ,JAVA,VB , etc. the Web (http/html) protocol uses the C language by default.

LoadRunnerScripting language Architecture

Loadrunner script mainly by action action contains 3 Independent function: vuser_init () action () , vuser_end ()

Function	Function description
Vuser_init ()	Typically, user-initiated operations are placed here, such as logging in, allocating memory
Action ()	Is the business that the virtual user wants to do, is the subject of the test content
Vuser_end ()	Corresponds to vuser_init () , doing cleanup operations, such as allocating memory for recycling, and so on.

LoadRunnerin theClanguage

the C compiler in LoadRunner follows the C90 Standard, which specifies that in a function, the variable definition must be placed before all execution statements.

The C interpreter used to run the vuser script only supports the ANSI C language. It does not support any extensions of Microsoft to ANSI C .

LoadRunner provides a powerful collection of APIs that are sufficient to meet the needs of most performance tests. In some cases, however, these APIs still have a place that is not covered. In this case, we can do it in a way that loads the DLL .

For example:

Lr_load_dll ("Something.dll");

Somefunction ();

LoadRunnerin theC VUserfunctioncommand-line parsing functions

Function	Function description
Lr_get_attrib_double	Retrieves the double type variable used in the script command line .
Lr_get_attrib_long	Retrieves a long type variable used in the script command line .
Lr_get_attrib_string	Retrieves the string used in the script command line.

Get information

Function	Function description
Lr_user_data_point	Record a sample of user-defined data.
Lr_whoami	Returns information about VUser to the vuser script. Not applicable for application management.
Lr_get_host_name	Returns the host name of the execution VUser script.
Lr_get_master_host_name	Returns the name of the computer running the LoadRunner controller or tuning console. Not applicable for application management.

Transaction functions

Function	Function description
Lr_end_sub_transaction	Marks the end of a child transaction for performance analysis.
Lr_end_transaction	Marks the end of a transaction.
Lr_end_transaction_instance	Marks the end of a transactional instance for performance analysis.
Lr_fail_trans_with_error	Sets the state of the open transaction to Lr_fail and sends an error message.
Lr_get_trans_instance_duration	Gets the duration of the transaction instance, as specified by its handle.
Lr_get_trans_instance_wasted_time	Gets the time wasted by the transaction instance, as specified by its handle.
Lr_get_transaction_duration	Gets the duration of the transaction, by the name of the transaction.
Lr_get_transaction_think_time	Gets the think time of the transaction, by the name of the transaction.
Lr_get_transaction_wasted_time	Gets the time that the transaction was wasted (by the name of the transaction).
Lr_resume_transaction	Continue to collect transaction data for performance analysis.
Lr_resume_transaction_instance	Continue to collect transactional instance data for performance analysis.
Lr_set_transaction_instance_status	Sets the state of the transaction instance.
Lr_set_transaction_status	Sets the state of the open transaction.
Lr_set_transaction_status_by_name	Sets the state of the transaction.
Lr_start_sub_transaction	Marks the beginning of a child transaction.
Lr_start_transaction	Marks the start of a transaction.
Lr_start_transaction_instance	Starts a nested transaction (specified by the handle of its parent transaction).
Lr_stop_transaction	Stop collection of transactional data.
Lr_stop_transaction_instance	Stops the collection of the transaction (specified by its handle) of the data.
Lr_wasted_time	Eliminate the time wasted on all open transactions.

String functions

Function	Function description
Lr_eval_string	Replace the parameter with the current value.
Lr_save_string	Saves a NULL -terminated string to the parameter.
Lr_save_var	Saves a variable-length string to a parameter.
Lr_save_datetime	Saves the current date and time to the parameter.
LR _advance_param	Advance to the next available parameter.
LR _decrypt	Decrypts the encoded string.
Lr_eval_string_ext	Retrieves a pointer to a buffer that contains parameter data.
Lr_eval_string_ext_free	Releases the pointer assigned by the LR_EVAL_STRING_EXT.
Lr_save_searched_string	Searches the buffer for a string instance and saves a portion of the buffer to the parameter relative to the string instance.

Message functions

Function	Function description
Lr_debug_message	Sends a debug message to the Output window or Orchestration monitor log file.
Lr_error_message	Sends an error message to the Output window or Orchestration monitor log file.
Lr_get_debug_message	Retrieves the current message class.
Lr_log_message	Sends a message to the log file.
Lr_output_message	Sends a message to the Output window or Orchestration monitor log file.
Lr_set_debug_message	Sets the debug message class.
Lr_vuser_status_message	Generates formatted output and prints it to the controller or console vuser status area. Not applicable for application management.
Lr_message	Sends a message to the vuser log and Output window or Orchestration monitor log file.

Run-time functions

Function	Function description
Lr_load_dll	Loads an external DLL.
Lr_peek_events	Indicates where the vuser script can be paused .
Lr_think_time	Pauses the execution of the script to simulate the think time (the time the actual user pauses between actions for thought).
Lr_continue_on_error	Specifies the method that handles the error.
Lr_rendezvous	Set the collection point in the vuser script. Not applicable for application management.

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

C Language of the LoadRunner scripting language