一个关于指针数组的问题

datoudatou3737

在linux下PC端做一个QT的MP3播放器；；想实现切换歌曲的时候出现问题，定义了一个指针数组，存放文件路径，调用madplay播放的时候出现乱码。。。以下是代码（有点乱，未经整理，请体谅）。。望各位帮帮忙，你的一个指点将是我们继续前进的动力！！！
void MyHelloForm::sayHello()
{
  // class FileDialog;
  int ret=0;
  youerPixmapLabel->clear();
  youerPixmapLabel->setFrameStyle( QFrame:anel | QFrame::Sunken );
  youerPixmapLabel->setText( "Hello\n\nI am Pretty Girl" );
  youerPixmapLabel->setAlignment( AlignCenter );  
  filename=FileDialog::getOpenFileName("/home"," *.mp3",this,"open file dialog";
  // const char *filena[100];
// sprintf(filena[i],"%s",filename);
filena[i]=filename;
printf("%s\n",filena[i]);
i++;
num=i;   
for(ret=0;ret<num;ret++)
printf("%s",filena[ret]);
  youerPixmapLabel->setText( filename );
}

void MyHelloForm::showMe()
{
  // youerPixmapLabel->clear();
  // youerPixmapLabel->setPixmap(*eddy);
   
int j;  
id=fork();
// char ii=i;
  // const char filena;
  // const char *filena[]={filename,"mymp3"};
  // char * exec_argv[]={"madplay",filename,NULL};
// char string[]=filename;  
  // exec_argv[1]=filename;
//exec_argv[2]=NULL;
   

printf("%d\n",i);
for(j=0;j<num;j++)
// printf("%s\n",filena[i]);
if(id==0)
{
execl("/home/datou/apps/mp3/target-x86/bin/madplay","madplay",filena[i-1],NULL);
// printf("%s\n",filena[i]);
exit(0);
}
// wait(id);
// for(ret=0;ret<num;ret++);
// printf("%s",filena[ret]);
}
void MyHelloForm::stop()
{

sprintf(killer,"kill -9 %d",id);
// const char killer[]={killer,"NULL"};
system(killer);
}
void MyHelloForm::forward()
{
printf("%s\n",filena[i-1]);
i++;
if(i>num)
{ i=1; }
sprintf(killer,"kill -9 %d",id);
// const char killer[]={killer,"NULL"};
system(killer);
printf("%d\n",num);
printf("%s\n",filena[i-1]);
  id=fork();
if(id==0)
{
execl("/home/datou/apps/mp3/target-x86/bin/madplay","madplay",filena[i-1],NULL);

}
}