文件读写

1、二进制读写

QMap<QString,int> inputData;
    inputData.insert("aaaa",12);
    inputData.insert("bbbb",30);

    QFile testFile("test.dat");
    if (!testFile.open(QIODevice::ReadWrite))
    {
        printf("error:open file fail");
        return -1;
    }

    QDataStream fileInputStream(&testFile);
    fileInputStream.setVersion(QDataStream::Qt_5_1);
    fileInputStream<<inputData;

    testFile.flush();

    QDataStream fileReadStream(&testFile);
    fileReadStream.setVersion(QDataStream::Qt_5_1);
    QMap<QString,int> readData;
    fileReadStream>>readData;

    QMapIterator<QString, int> itr(readData);
    while(itr.hasNext())
    {
        printf("key=%s\r\n",itr.next().key().toLatin1().data());
        printf("data=%d\r\n",itr.next().value());
    }

2、文本读写

QFile txtFile("test.txt");
    if (!txtFile.open(QIODevice::ReadOnly))
    {
        printf("error:open file\r\n");
        return -1;
    }
    QString readLine;
    QTextStream txtStream(&txtFile);
    while (!txtStream.atEnd())
    {
        readLine = txtStream.readLine();
        printf("line:%s\r\n",readLine.toLatin1().data());
    }
    printf("read end\r\n");