External Lib read from QBuffer on Calback problem

[patrik08]

i try to write on device and i leave dev->setBuffer(&bytes);
is the same, libpng can only write on device .. why not read ..

qt access the image isValid on read & write ....

i can not set file over 100 png frame movie....

public:
  APNGImageStream( const int mode , QByteArray in = QByteArray() ) 
  :dev(new QBuffer()),bytes(in) 
  {
   if (mode == 1) {
     /* pnglib write in */
     dev->setBuffer(&bytes);
     dev->open(QIODevice::WriteOnly);
   } else {
     /* qt write in && png read out */
     dev->open(QIODevice::ReadWrite);
     dev->write(bytes);
     dev->seek(0);
   }
  }

public:
  APNGImageStream( const int mode , QByteArray in = QByteArray() ) 
  :dev(new QBuffer()),bytes(in) 
  {
   if (mode == 1) {
     /* pnglib write in */
     dev->setBuffer(&bytes);
     dev->open(QIODevice::WriteOnly);
   } else {
     /* qt write in && png read out */
     dev->open(QIODevice::ReadWrite);
     dev->write(bytes);
     dev->seek(0);
   }
  }

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