配置文件在Qt中被覆盖 [英] Config file gets overwritten in qt

问题描述

我正在使用以下代码将数据写入配置文件。

I am writing data to a config file using the following code.

   QSettings settings("/root/configFile.ini",QSettings::IniFormat);

   QString userName = lineEditUsername.text();
   QString password = lineEditPassword.text();

   QList<QString> listUsername;
   QList<QString> listPassword;

   settings.beginWriteArray("UserData");

   for(i=0;i<listUsername.size();i++)
  {
      Qstring user = listUsername.at(i);         
      Qstring pass = listPassword.at(i);

      settings.setArryIndex(i);
      settings.setValue("Username",user);
      settings.setValue("Password",pass);
   }

  settings.endArray();
 }

现在，当我第一次运行代码并给出4或5个值时在文件中以正确的顺序形成。但是，如果我第二次运行该应用程序，则值将从第一个位置开始覆盖。有人可以建议我一些解决方案吗？

Now when I run the code first time and give 4 or 5 values they are formed in proper order in the file. However if I run the application for second time the values start overwriting from first position. Can some one suggest me some solution for this?

推荐答案

我建议不要创建和维护数组和索引，而是建议创建用户凭据映射并将其存储在设置文件中，如下所示：

Instead of creating and maintaining arrays and indexes, I would propose to create user credentials map and store it in the settings file as follows:

QSettings settings("/root/configFile.ini", QSettings::IniFormat);

QString userName = lineEditUsername.text();
QString password = lineEditPassword.text();

QList<QString> listUsername;
QList<QString> listPassword;

//settings.beginWriteArray("UserData");

QVariantMap userDataMapping;

for(int i = 0; i < listUsername.size() ; i++)
{
    QString user = listUsername.at(i);         
    QString pass = listPassword.at(i);

    userDataMapping[user] = pass;

    //settings.setArryIndex(i);
    //settings.setValue("Username",user);
    //settings.setValue("Password",pass);
}

// Store the mapping.
settings.setValue("UserData", userDataMapping);

//settings.endArray();
// ...

这将以以下格式将数据存储在ini文件中：

This will store your data in ini file in the following format:

UserData=@Variant(\0\0\0\b\0\0\0\x1\0\0\0\x6\0\x64\0\x64\0\x64\0\0\0\n\0\0\0\x6\0\x62\0\x62\0\x62)

在阅读设置时，请执行以下操作：

When you read settings, do something like this:

[..]
QVariant v = settings.value("UserData");
QVariantMap map = v.value<QVariantMap>();
QMapIterator<QString, QVariant> i(map);
while (i.hasNext()) {
    i.next();
    QString user = i.key();
    QString pass = i.value().toString();
}

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