QFile按行读取分割xml文件

xml文件很大时不方便操作
按行读取切割xml文件

枚举值 描述
QIODevice::NotOpen 未打开
QIODevice::ReadOnly 以只读方式打开
QIODevice::WriteOnly 以只写方式打开
QIODevice::ReadWrite 以读写方式打开
QIODevice::Append 以追加的方式打开，新增加的内容将被追加到文件末尾
QIODevice::Truncate 以重写的方式打开，在写入新的数据时会将游标设置在文件开头
QIODevice::Text 在读取时，将行结束符转换成 \n；在写入时，将行结束符转换成本地格式，例如 Win32 平台上是 \r\n
QIODevice::Unbuffered 忽略缓存

xml文件示例

	GeorgeJohnReminder

	GeorgeJohnReminder

	GeorgeJohnReminder

#include 
#include 
#include 
#include 
#include 
#include 
#include 

void splitXmlFile();
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
    splitXmlFile();
    return a.exec();
}

/*
 * 读取当前目录下dump.xml
 * 分割成小xml文件在split下
*/
void splitXmlFile()
{
    QDir tempDir;
    QString currentDir = tempDir.currentPath();
    qDebug() << currentDir;
    QString baseFile = currentDir + "/dump.xml";

    // 
    QString dbStart = "";
    QString dbName;

    // 
    QString tableStart = "";
    QString tableFinish = "";
    QString tableName;

    // 创建输出目录
    QString outputPath = currentDir + "/split";
    tempDir.mkpath(outputPath);

    QFile *basefile = new QFile(baseFile);
    if(!basefile->open(QIODevice::ReadOnly | QIODevice::Text))
    {
        qDebug() << "open failed.";
        return;
    }

    // 获取根标签名字
    while(!basefile->atEnd())
    {
        QByteArray line = basefile->readLine();
        QString lineStr(line);
        if(lineStr.contains(dbStart))
        {
            qDebug() << "contain dbstart : " << lineStr;
            int dbNameStartPos = lineStr.indexOf(dbStart) + dbStartLen;
            int dbNameLen = lineStr.indexOf(dbEnd) - dbNameStartPos;
            dbName = lineStr.mid(dbNameStartPos, dbNameLen);
            qDebug() << "db name : " << dbName;
            break;
        }
    }

    // 获取子标签
    QString tableFile = outputPath + "/" + dbName + "#";
    while(!basefile->atEnd())
    {
        QByteArray line = basefile->readLine();
        QString lineStr(line);
        if(lineStr.contains(tableStart))
        {
            int tableNameStartPos = lineStr.indexOf(tableStart) + tableStartLen;
            int tableNameLen = lineStr.indexOf(tableEnd) - tableNameStartPos;
            tableName = lineStr.mid(tableNameStartPos, tableNameLen);
            QString tableFile = outputPath + "/" + dbName + "#" + tableName;
            QFile *inputfile = new QFile(tableFile);
            if(!inputfile->open(QIODevice::WriteOnly | QIODevice::Truncate))
            {
                basefile->close();
                qDebug() << "open file failed.";
                return;
            }
            QTextStream stream(inputfile);
            stream << lineStr;
            while(!basefile->atEnd())
            {
                line = basefile->readLine();
                lineStr = line;
                stream << lineStr;
                if(lineStr.contains(tableFinish))
                {
                    stream.flush();
                    inputfile->close();
                    break;
                }
            }

        }
    }

    basefile->close();
    qDebug() << "end.";
}