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annotate src/debugging/TSLogger.cpp @ 754:4ec2ac09969d

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Renamed the logger class and put it into a namespace for later universal tool reuse. git-svn-id: svn://svn.code.sf.net/p/universalindent/code/trunk@1031 59b1889a-e5ac-428c-b0c7-476e01d41282
author thomas_-_s <thomas_-_s@59b1889a-e5ac-428c-b0c7-476e01d41282>
date Tue, 21 Dec 2010 23:07:50 +0000
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children d690e8f38122
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754
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1 /***************************************************************************
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2 * Copyright (C) 2006-2010 by Thomas Schweitzer *
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3 * thomas-schweitzer(at)arcor.de *
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4 * *
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5 * This program is free software; you can redistribute it and/or modify *
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6 * it under the terms of the GNU General Public License version 2.0 as *
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7 * published by the Free Software Foundation. *
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8 * *
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9 * This program is distributed in the hope that it will be useful, *
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10 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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12 * GNU General Public License for more details. *
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13 * *
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14 * You should have received a copy of the GNU General Public License *
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15 * along with this program in the file LICENSE.GPL; if not, write to the *
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16 * Free Software Foundation, Inc., *
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17 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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18 ***************************************************************************/
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19
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20 #include "TSLogger.h"
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21 #include "ui_TSLoggerDialog.h"
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22
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23 #include "SettingsPaths.h"
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24
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25 #include <QDateTime>
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26 #include <QFile>
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27 #include <QFileInfo>
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28 #include <QUrl>
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29 #include <QTextStream>
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30 #include <QDesktopServices>
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31 #include <QMessageBox>
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32
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33 #include <ctime>
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34
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35 using namespace tschweitzer;
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36 using namespace tschweitzer::debugging;
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37
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38 TSLogger* TSLogger::_instance = NULL;
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39
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40 /*!
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41 \class TSLogger
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42 \brief This class handles any kind of data logging, for debugging and whatever purpose.
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43
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44 Beneath being able of displaying a dialog window containing all log messages of the
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45 current session, a log file in the systems temporary directory is used. Its name
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46 is "UiGUI_log.html".
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47
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48 Setting a verbose level allows to only write messages that have the selected minimum
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49 priority to the log.
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50 */
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51
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52 /*!
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53 \brief Returns the only existing instance of TSLogger. If the instance doesn't exist, it will be created.
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54 */
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55 TSLogger* TSLogger::getInstance(int verboseLevel) {
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56 if ( _instance == NULL )
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57 _instance = new TSLogger(verboseLevel);
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58
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59 return _instance;
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60 }
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61
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62
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63 /*!
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64 \brief Returns the only existing instance of TSLogger. If the instance doesn't exist, it will be created.
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65 */
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66 TSLogger* TSLogger::getInstance() {
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67 #ifdef _DEBUG
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68 return TSLogger::getInstance(QtDebugMsg);
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69 #else
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70 return TSLogger::getInstance(QtWarningMsg);
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71 #endif
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72 }
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73
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74
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75 /*!
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76 \brief Initializes the dialog and sets the path to the log file in the systems temporary directory.
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77 Sets the default verbose level to warning level.
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78 */
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79 TSLogger::TSLogger(int verboseLevel) : QDialog() {
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80 _TSLoggerDialogForm = new Ui::TSLoggerDialog();
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81 _TSLoggerDialogForm->setupUi(this);
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82 #ifdef _DEBUG
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83 _verboseLevel = QtDebugMsg;
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84 #else
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85 _verboseLevel = QtMsgType(verboseLevel);
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86 #endif
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87
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88 _logFileInitState = NOTINITIALZED;
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89
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90 connect( _TSLoggerDialogForm->openLogFileFolderToolButton, SIGNAL(clicked()), this, SLOT(openLogFileFolder()) );
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91
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92 // Make the main application not to wait for the logging window to close.
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93 setAttribute(Qt::WA_QuitOnClose, false);
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94 }
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95
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96
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97 /*!
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98 \brief Logs all incoming messages \a msg to the dialogs text edit and to the log file.
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99
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100 Only messages whos \a type have a higher priority than the set verbose level are logged.
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101 */
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102 void TSLogger::messageHandler(QtMsgType type, const char *msg) {
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103 if ( _instance == NULL )
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104 _instance = TSLogger::getInstance();
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105
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106 //*
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107 QMessageBox messageBox;
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108 QString messageBoxText = QString::fromUtf8( msg );
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109 messageBox.setText( messageBoxText );
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110 messageBox.setWindowModality( Qt::ApplicationModal );
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111 messageBox.exec();
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112 //*/
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113
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114 // Only log messages that have a higher or equal priority than set with the verbose level.
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115 if ( type < _instance->_verboseLevel )
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116 return;
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117
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118 // Init log message with prepended date and time.
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119 QString message = QDateTime::currentDateTime().toString();
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120
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121 // Depending on the QtMsgType prepend a different colored Debug, Warning, Critical or Fatal.
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122 switch (type) {
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123 case QtDebugMsg :
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124 message += " <span style=\"font-weight:bold; color:black;\">Debug:</span> ";
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125 break;
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126 case QtWarningMsg :
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127 message += " <span style=\"font-weight:bold; color:gold;\">Warning:</span> ";
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128 break;
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129 case QtCriticalMsg :
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130 message += "<span style=\"font-weight:bold; color:red;\">Critical:</span> ";
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131 break;
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132 case QtFatalMsg :
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133 message += " <span style=\"font-weight:bold; color:#D60000;\">Fatal:</span> ";
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134 // This one is no Qt message type, but can be used to send info messages to the log
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135 // by calling TSLogger::messageHandler() directly.
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136 case TSLoggerInfoMsg :
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137 message += " <span style=\"font-weight:bold; color:darkgray;\">Info:</span> ";
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138 break;
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139 }
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140
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141 // Append the to UTF-8 back converted message parameter.
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142 message += QString::fromUtf8( msg ) + "<br/>\n";
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143
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144 // Write the message to the log windows text edit.
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145 _instance->_TSLoggerDialogForm->logTextEdit->append( message );
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146
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147 // Write/append the log message to the log file.
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148 _instance->writeToLogFile( message );
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149
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150 // In case of a fatal error abort the application.
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151 if ( type == QtFatalMsg )
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152 abort();
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153 }
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154
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155
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156 /*!
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157 \brief Calling this the verbose level can be set in a range from 0 to 3
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158 which is equal to debug, warning, critical and fatal priority.
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159 */
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160 void TSLogger::setVerboseLevel(int level) {
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161 if ( level < 0 )
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162 _verboseLevel = QtDebugMsg;
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163 if ( level > 3 )
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164 _verboseLevel = QtFatalMsg;
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165 else
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166 _verboseLevel = QtMsgType(level);
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167 }
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168
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169
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170 /*!
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171 \brief Deletes the existing _instance of TSLogger.
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172 */
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173 void TSLogger::deleteInstance() {
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174 if ( _instance != NULL ) {
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175 delete _instance;
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176 _instance = NULL;
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177 }
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178 }
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179
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180
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181 /*!
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182 \brief Opens the folder that contains the created log file with the name "UiGUI_log.html".
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183 */
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184 void TSLogger::openLogFileFolder() {
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185 QDesktopServices::openUrl( QFileInfo( _logFile ).absolutePath() );
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186 }
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187
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188
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189 /*!
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190 \brief Writes the \a message to the used log file.
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191 */
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192 void TSLogger::writeToLogFile(const QString &message) {
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193 // If the file where all logging messages should go to isn't initilized yet, do that now.
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194 if ( _logFileInitState == NOTINITIALZED ) {
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195 _logFileInitState = INITIALIZING;
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196
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197 // On different systems it may be that "QDir::tempPath()" ends with a "/" or not. So check this.
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198 // Remove any trailing slashes.
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199 QString tempPath = QFileInfo( SettingsPaths::getTempPath() ).absolutePath();
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200 while ( tempPath.right(1) == "/" ) {
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201 tempPath.chop(1);
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202 }
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203
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204 // To make the temporary log file invulnerable against file symbolic link hacks
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205 // append the current date and time up to milliseconds to its name and a random character.
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206 QString logFileName = "UiGUI_log_" + QDateTime::currentDateTime().toString("yyyyMMdd");
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207 logFileName += "-" + QDateTime::currentDateTime().toString("hhmmsszzz");
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208 // By random decide whether to append a number or an upper or lower case character.
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209 qsrand( time(NULL) );
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210 unsigned char randomChar;
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211 switch ( qrand() % 3 ) {
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212 // Append a number from 0 to 9.
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213 case 0 :
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214 randomChar = qrand() % 10 + '0';
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215 break;
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216 // Append a upper case characer between A and Z.
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217 case 1 :
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218 randomChar = qrand() % 26 + 'A';
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219 break;
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220 // Append a lower case characer between a and z.
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221 default :
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222 randomChar = qrand() % 26 + 'a';
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223 break;
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224 }
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225 logFileName += "_" + QString(randomChar) + ".html";
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226
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227 _logFile.setFileName( tempPath + "/" + logFileName );
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228
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229 // Set the tooltip of the open log file folder button to show the unique name of the log file.
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230 _TSLoggerDialogForm->openLogFileFolderToolButton->setToolTip( _TSLoggerDialogForm->openLogFileFolderToolButton->toolTip() + " (" + logFileName + ")" );
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231
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232 _logFileInitState = INITIALZED;
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233 }
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234
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235 // Add the message to the message queue.
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236 _messageQueue << message;
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237
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238 // If the logging file is initialzed, write all messages contained in the message queue into the file.
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239 if ( _logFileInitState == INITIALZED ) {
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240 // Write/append the log message to the log file.
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241 if ( _logFile.open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append) ) {
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242 QTextStream out(&_logFile);
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243
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244 while ( !_messageQueue.isEmpty() ) {
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245 out << _messageQueue.takeFirst() << "\n";
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246 }
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247
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248 _logFile.close();
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249 }
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250 }
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251 }