generate code 39 barcode using c# LAYING OUT THE FOUNDATIONS in Visual C#

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CHAPTER 2 LAYING OUT THE FOUNDATIONS
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/* Generic error message to be displayed instead of debug info (when DEBUGGING is false) */ define('SITE_GENERIC_ERROR_MESSAGE', '<h2>HatShop Error!</h2>'); > 2. In the hatshop folder, create a subfolder named business. 3. In the business folder, create a file named error_handler.php file, and write the following code: < php class ErrorHandler { // Private constructor to prevent direct creation of object private function __construct() { } /* Set user error handler method to ErrorHandler::Handler method */ public static function SetHandler($errTypes = ERROR_TYPES) { return set_error_handler(array ('ErrorHandler', 'Handler'), $errTypes); } // Error handler method public static function Handler($errNo, $errStr, $errFile, $errLine) { /* The first two elements of the backtrace array are irrelevant: - ErrorHandler.GetBacktrace - ErrorHandler.Handler */ $backtrace = ErrorHandler::GetBacktrace(2); // Error message to be displayed, logged, or mailed $error_message = "\nERRNO: $errNo\nTEXT: $errStr" . "\nLOCATION: $errFile, line " . "$errLine, at " . date('F j, Y, g:i a') . "\nShowing backtrace:\n$backtrace\n\n"; // Email the error details, in case SEND_ERROR_MAIL is true if (SEND_ERROR_MAIL == true) error_log($error_message, 1, ADMIN_ERROR_MAIL, "From: " . SENDMAIL_FROM . "\r\nTo: " . ADMIN_ERROR_MAIL); // Log the error, in case LOG_ERRORS is true if (LOG_ERRORS == true) error_log($error_message, 3, LOG_ERRORS_FILE);
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CHAPTER 2 LAYING OUT THE FOUNDATIONS
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/* Warnings don't abort execution if IS_WARNING_FATAL is false E_NOTICE and E_USER_NOTICE errors don't abort execution */ if (($errNo == E_WARNING && IS_WARNING_FATAL == false) || ($errNo == E_NOTICE || $errNo == E_USER_NOTICE)) // If the error is nonfatal ... { // Show message only if DEBUGGING is true if (DEBUGGING == true) echo '<pre>' . $error_message . '</pre>'; } else // If error is fatal ... { // Show error message if (DEBUGGING == true) echo '<pre>' . $error_message . '</pre>'; else echo SITE_GENERIC_ERROR_MESSAGE; // Stop processing the request exit; } } // Builds backtrace message public static function GetBacktrace($irrelevantFirstEntries) { $s = ''; $MAXSTRLEN = 64; $trace_array = debug_backtrace(); for ($i = 0; $i < $irrelevantFirstEntries; $i++) array_shift($trace_array); $tabs = sizeof($trace_array) - 1; foreach ($trace_array as $arr) { $tabs -= 1; if (isset ($arr['class'])) $s .= $arr['class'] . '.'; $args = array (); if (!empty ($arr['args']))
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CHAPTER 2 LAYING OUT THE FOUNDATIONS
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foreach ($arr['args']as $v) { if (is_null($v)) $args[] = 'null'; elseif (is_array($v)) $args[] = 'Array[' . sizeof($v) . ']'; elseif (is_object($v)) $args[] = 'Object: ' . get_class($v); elseif (is_bool($v)) $args[] = $v 'true' : 'false'; else { $v = (string)@$v; $str = htmlspecialchars(substr($v, 0, $MAXSTRLEN)); if (strlen($v) > $MAXSTRLEN) $str .= '...'; $args[] = '"' . $str . '"'; } } $s .= $line $file $s .= $s .= } return $s; } } > 4. Modify the include/app_top.php file to include the newly created error_handler.php file, and set the error handler: < php // Include utility files require_once 'include/config.php'; require_once BUSINESS_DIR . 'error_handler.php'; // Sets the error handler ErrorHandler::SetHandler(); // Load the page template require_once PRESENTATION_DIR . 'page.php'; > $arr['function'] . '(' . implode(', ', $args) . ')'; = (isset ($arr['line']) $arr['line']: 'unknown'); = (isset ($arr['file']) $arr['file']: 'unknown'); sprintf(' # line %4d, file: %s', $line, $file); "\n";
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CHAPTER 2 LAYING OUT THE FOUNDATIONS
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5. Great! You just finished writing the new error-handling code. Let s test it. First, load the web site in your browser to see that you typed in everything correctly. If you get no errors, test the new error-handling system by adding the following line to include/app_top.php: < php // Include utility files require_once 'include/config.php'; require_once BUSINESS_DIR . 'error_handler.php'; // Sets the error handler ErrorHandler::SetHandler(); // Load the page template require_once PRESENTATION_DIR . 'page.php'; // Try to load inexistent file require_once 'inexistent_file.php'; > Now load again index.php in your browser, and admire your brand new error message as shown in Figure 2-10.
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Figure 2-10. Error message showing backtrace information Don t forget to remove the buggy line from app_top.php before moving on.
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