hi , all.

i use QAudioInput record sound.

input code is :
Qt Code: 
  1. void start(){
  2.     file = new QFile("C:/audiorecord.raw");
  3.     file->open(QIODevice::WriteOnly | QIODevice::Truncate);
  4.     //set format
  5.     QAudioFormat format;
  6.     format.setSampleRate(8000);
  7.     format.setChannelCount(1);
  8.     format.setSampleSize(32);
  9.     format.setCodec("audio/pcm");
  10.     format.setByteOrder(QAudioFormat::LittleEndian);
  11.     format.setSampleType(QAudioFormat::Float);
  12.  
  13.     input = new QAudioInput(format, this);//input is QAudioInput * input;
  14.     input->start(file);
  15. }
  16.  
  17. void finish(){
  18.     input->stop();
  19.     file->close();
  20. }
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write data to successful , call function "void finish()" later.

Qt Code: 
  1. void play(){
  2.     file->setFileName("C:/audiorecord.raw");
  3.     file->open(QIODevice::ReadOnly);
  4.  
  5.     QAudioFormat format;
  6.     format.setSampleRate(8000);
  7.     format.setChannelCount(1);
  8.     format.setSampleSize(32);
  9.     format.setCodec("audio/pcm");
  10.     format.setByteOrder(QAudioFormat::LittleEndian);
  11.     format.setSampleType(QAudioFormat::Float);
  12.  
  13.     output = new QAudioOutput(format,0);
  14.     output->start(file);
  15. }
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if the program not restarted , in "start()" later call function "play()" is no problem, Play success.

but if program restarted , call play() is program crash.

What's the problem?

I will very much appreciate it.