Hi, Below is a macro I use for debugging. Before I put this in Wiki I thought I would post it here so that if it is useful, we will put it in wiki

Qt Code: 
  1. // --- Debugging --- 
  2. #include <QtDebug>
  3.  
  4. #define APP_NO_DEBUG_MESSAGES
  5.  
  6.  
  7. #if !defined( APP_NO_DEBUG_MESSAGES )
  8.  
  9. // Flags for Debug Output
  10. #   define DEBUG_PRINT_FILEPATH
  11. #   define DEBUG_PRINT_SHORT_FN_NAME
  12. #   define DEBUG_PRINT_LINENUMBER
  13.  
  14. // Adjust Length of fields Here 
  15. //   FileName
  16. #   define DEBUG_FILEPATH_LENGTH 27
  17. #   define DEBUG_FILENAME_LENGTH 22
  18. //   Function
  19. #   define DEBUG_LONG_FUNCTION_LENGTH 40
  20. #   define DEBUG_SHORT_FUNCTION_LENGTH 25
  21.  
  22. //   LineNumber
  23. #   define DEBUG_LINENUMBER_LENGTH 4
  24.  
  25. //  file names
  26. #   if defined( DEBUG_PRINT_FILEPATH )
  27. #       define DEBUG_FILENAME  ( QString( "%1").arg(__FILE__ , \
  28.                                     -DEBUG_FILEPATH_LENGTH, QLatin1Char(' ')) )
  29.  
  30. #   elif defined( DEBUG_PRINT_FILENAME )
  31. #       include <QFileInfo>
  32. #       define DEBUG_FILENAME  ( QString( "%1").arg( \
  33.                                     QFileInfo(__FILE__).fileName(), \
  34.                                     -DEBUG_FILENAME_LENGTH, QLatin1Char(' ')) )
  35.  
  36. #   elif defined( DEBUG_NO_FILENAME )
  37. #       define DEBUG_FILENAME  ""
  38. #   else
  39. #       error No debug file flags defined
  40. #   endif
  41.  
  42. // function Names
  43. #   if defined( Q_CC_GNU )
  44. #       if defined ( DEBUG_PRINT_LONG_FN_NAME )
  45. #           define DEBUG_FUNCTION_NAME  QString( " %1").arg( __PRETTY_FUNCTION__, \
  46.                                             -DEBUG_FULL_FUNCTION_LENGTH, QLatin1Char(' '))
  47. #
  48. #       elif defined ( DEBUG_PRINT_SHORT_FN_NAME )
  49. #           define DEBUG_FUNCTION_NAME  QString( " %1").arg( __FUNCTION__ +QString("()"), \
  50.                                             -DEBUG_SHORT_FUNCTION_LENGTH, QLatin1Char(' '))
  51. #
  52. #       elif defined ( DEBUG_NO_FUNCTION_NAME )
  53. #           define DEBUG_FUNCTION_NAME  ""
  54. #       else
  55. #           error No debug fuction flags defined
  56. #       endif
  57. #   else
  58. #       define DEBUG_FUNCTION_NAME  ""
  59. #   endif
  60.  
  61. // Line numbers
  62. #   if defined ( DEBUG_PRINT_LINENUMBER )
  63. #       define DEBUG_LINENUMBER  ( QString("[%1]")\
  64.                     .arg( QString::number(__LINE__), DEBUG_LINENUMBER_LENGTH, QLatin1Char(' '))  )
  65. #   else
  66. #       define DEBUG_LINENUMBER  ""
  67. #   endif
  68.  
  69. // Debug Macro 
  70. #    define DEBUG() qDebug() << QString(  DEBUG_FILENAME + DEBUG_LINENUMBER + DEBUG_FUNCTION_NAME + " :" )
  71. #else
  72. #    define DEBUG() if(true);else qDebug()
  73. #endif
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How do I use it
Qt Code: 
  1. #include "Debug.h"
  2.  
  3. void foo(){
  4.    DEBUG() << "Blah " << "Blah "
  5. }
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