你输出到哪里的?qDebug么……
看了下源代码,还真是……
叫qDebug,当然只在debug模式下输出咯……
void qDebug ( const char * msg, ... )
Calls the message handler with the debug message msg. If no message handler has been installed, the message is printed to stderr. Under Windows, the message is sent to the console, if it is a console application; otherwise, it is sent to the debugger. This function does nothing if QT_NO_DEBUG_OUTPUT was defined during compilation.