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LoadRunner如何在脚本运行时修改log设置选项？答案是使用lr_set_debug_message函数：
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 );
参数message_level的设置与LR的run-time设置界面中的选项有对应关系，可参考下表以及LR的帮助文档：
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 |
在脚本动态设置log选项前，可以采用下面的函数来清空已有的设置：
// 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;
}
脚本中使用了lr_get_debug_message函数来取得当前的设置。
参考：
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