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# Example: lr_set_debug_message

## Enabling full trace

In this example, the lr_set_debug_message function enables the full trace option just before a call to lrd_fetch, which the user needs to debug because it has been giving unexpected results.

The second invocation of lr_set_debug_message resets the debug level to what it was formerly, by turning off (LR_SWITCH_OFF) the Extended message level.

    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 );

## Disabling messages

In this example, the lr_set_debug_message function disables lr_message and lr_output_message from writing to the log unless an error occurred.

    unsigned int n = lr_get_debug_message();         // get the current log level

    lr_output_message("The current level is %d", n); // this message is written to the log

    lr_set_debug_message(n, LR_SWITCH_OFF);      // clear all flags

    lr_set_debug_message(LR_MSG_CLASS_JIT_LOG_ON_ERROR, LR_SWITCH_ON); // set the log level to JIT
      // After the above two calls, LR_MSG_CLASS_JIT_LOG_ON_ERROR && FFFF = LR_MSG_CLASS_JIT_LOG_ON_ERROR.

    lr_output_message("This output message is not written to log");

    lr_message("%s", "This output message is not written to log");

    // If an error is output by the product or lr_error_message is called,
    // recent messages that were blocked are then logged.
    // The recent messages are logged no matter what message level is in effect.
    //lr_error_message("%s",
    //			"The messages from lr_output_message and lr_message are logged with this message.");

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