各位大虾们帮我看看为啥内存分配失败？（qt）

elvalanna

在这里内存分配失败，可是在其他的函数分配比这里还大的空间也没问题
unsigned char* volumeData = new unsigned char[uncompressedSize];

·————————————————错误提示
uncompressedSize = 315698688
terminate called after throwing an instance of 'std::bad_alloc'
  what(): std::bad_alloc

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.


·————————————————関数
int ProjectController:penProject(RzApplicationContext *app,
  QString projfolder) {
  QDir pdir(projfolder);
  QString strPFile = pdir.absoluteFilePath("RzContour.rc";
  QString strVFile = pdir.absoluteFilePath("RzVolume.rzv";
  QFile filePrj(strPFile);
  QFile fileVol(strVFile);


  //Error, Volume data is zero
  if(fileVol.size()==0)
  return -1;

  //Read VolumeData
  fileVol.open(QIODevice::ReadOnly);
  QDataStream volstream(&fileVol);
  QByteArray volCmprsdByteArray;

  int nx, ny, nz, bbp;
  int voltype;
  volstream >> nx;
  volstream >> ny;
  volstream >> nz;
  volstream >> bbp;
  volstream >> voltype;
  volstream >> volCmprsdByteArray;
  QByteArray volUncmprsdByeArray = qUncompress(volCmprsdByteArray);

  //Create New Project
  ProjectController::newProject(app);
  RzProjectContext *prjCtx = app->getProjectContext();
  RzContourContext *contourCtx =
  (RzContourContext*) prjCtx->getPluginContext("RzContourContext";

  int uncompressedSize = volUncmprsdByeArray.size();
  qDebug("uncompressedSize = %i",uncompressedSize);
  unsigned char* volumeData = new unsigned char[uncompressedSize];
  qDebug("After new uncompressedSize = %i",uncompressedSize);  

  //Create New Volume Data
  RzVolume *rzvol = new RzVolume();
  rzvol->setXSize(nx);
  rzvol->setYSize(ny);
  rzvol->setZSize(nz);
  rzvol->setBytesPerPixel(bbp);
  rzvol->setVolumeType(voltype);

   
  unsigned char* source = (unsigned char*) volUncmprsdByeArray.data();
  //memcpy()
  memcpy(volumeData, source, uncompressedSize);
  rzvol->setData(volumeData);
  rzvol->setSavedChanges(true);
  prjCtx->setVolumeData(rzvol);

  //Now load contour data using XML parser
  ProjectXMLHandler handler(contourCtx, rzvol);

  QXmlSimpleReader xmlReader;
  xmlReader.setContentHandler(&handler);
  xmlReader.setErrorHandler(&handler);

  QXmlInputSource inputSource(&filePrj);

  xmlReader.parse(inputSource);

  if(!handler.isValidRinzoFormat())
  return -1;

  prjCtx->setProjectFolder(projfolder);

  //qDebug()
  return 0;


}

hellioncu

这个应该问操作系统

elvalanna

有没有高人能解决这个问题啊？