cant make QSound work

[akon]

i cant make a sound using QSound.
ubuntu 8.04
QT X11
Wave file is 16 bit non-compressed .

#include <QApplication>
#include <QSound>
 
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
 
 QSound:: play("../wavefile/laugh.wav");
 
/* QString alarmInfo;
    if (argc > 1) {
    	alarmInfo = argv[1];
    }
    else {
    	alarmInfo = "..........................." ;
    }
*/
 
    return a.exec();
}

#include <QApplication>
#include <QSound>


int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
   
 QSound:: play("../wavefile/laugh.wav");

/* QString alarmInfo;
    if (argc > 1) {
    	alarmInfo = argv[1];
    }
    else {
    	alarmInfo = "..........................." ;
    }
*/
       
    return a.exec();
}

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