LoadRunner如何在指令碼執行時修改log設定選項？

LoadRunner如何在指令碼執行時修改log設定選項？答案是使用lr_set_debug_message函式：

 

lr_set_debug_message

Sets the message level for the script execution.

 

int lr_set_debug_message (unsigned int message_level, unsigned int on_off);

 

例子：

lr_set_debug_message(LR_MSG_CLASS_EXTENDED_LOG |             LR_MSG_CLASS_FULL_TRACE, LR_SWITCH_ON );

rc = lrd_fetch(Csr1, 1, 1, 0, PrintRow3);

if (rc>2000)

    lr_debug_message(LR_MSG_CLASS_FULL_TRACE,
             "Fetch failed returned %d", rc);

/* Now reset message class to former level */
lr_set_debug_message(LR_MSG_CLASS_EXTENDED_LOG |             LR_MSG_CLASS_FULL_TRACE, LR_SWITCH_OFF );

 

 

引數message_level的設定與LR的run-time設定介面中的選項有對應關係，可參考下表以及LR的幫助文件：

Each logging option has a C-constant that is a binary value with a 1 in the position that corresponds to the log option.

Log Level	C Constant	Value	Binary Value
Disabled	LR_MSG_CLASS_DISABLE_LOG	0	00000000 00000000
Brief	LR_MSG_CLASS_BRIEF_LOG	1	00000000 00000001
Extended Log	LR_MSG_CLASS_EXTENDED_LOG	16	00000000 00010000
Result Data	LR_MSG_CLASS_RESULT_DATA	2	00000000 00000010
Parameter Substitution	LR_MSG_CLASS_PARAMETERS	4	00000000 00000100
Full Run-Time Trace	LR_MSG_CLASS_FULL_TRACE	8	00000000 00001000
Log on Error	LR_MSG_CLASS_JIT_LOG_ON_ERROR	512	00000010 00000000

 

 

在指令碼動態設定log選項前，可以採用下面的函式來清空已有的設定：

// Turn off all logging options (this is the same as having logging disabled).

void jds_clear_log_options(void) {

      unsigned int log_options = lr_get_debug_message();

      lr_set_debug_message(log_options, LR_SWITCH_OFF); 

      return;

}

 

指令碼中使用了lr_get_debug_message函式來取得當前的設定。

 

 

參考：

http://www.jds.net.au/tech-tips/loadrunner-log-options/