Qt中如何将文件读出并存放在一个指针里

原程序是用CFile::Read（pionter,length）来实现的，我尝试用了QDataStream::readRawData（pointer,length）来读，但是得到的pointer为空，下面附上CFile实现的代码和我写的代码

            pOffsetBuffer = new unsigned short[dwRows*dwColumns*(sizeof(unsigned short))];

                        if (file.open(strOffsetFile,QFile::typeBinary|CFile::modeRead))
            {// 打开文件

                UINT nByte = file.Read(pOffsetBuffer, dwRows*dwColumns*sizeof(unsigned short)); // 读取文件
                file.Close();

                bOffsetOK = true;
            }

  pOffsetBuffer = new unsigned short[dwRows*dwColumns*(sizeof(unsigned short))];

    QFile rawfile(strOffsetFile);
            if (rawfile.open(QIODevice::ReadOnly))
            {// 打开文件

                QDataStream in(&rawfile);

                char* cp= new char[dwRows*dwColumns*(sizeof(unsigned short))];

                int nByte = in.readRawData(cp,dwRows*dwColumns*(sizeof(unsigned short)));

                memcpy(pOffsetBuffer,cp,dwRows*dwColumns*(sizeof(unsigned short)));