Qt软件开发文档18---QSettings类的封装与调用，文件路径判断

简述

软件开发时候，往往需要利用QSettings写入ini配置文件
多次调用QSettings的读写加大代码量，同时，修改时也会加大难度。
为此封装一个ConFRouter类，利用QSettings统一管理配置文件里的内容。

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类的声明与定义

1. ConFRouter.h

class DLL_API ConFRouter{public:    static ConFRouter* create_confrouter(const QString& path = QString(""));    void save_file();    void read_file();    QString& operator[](const QString& key);private:    ConFRouter(const QString& path);    QString _root;    QHash<QString, QString*> _find;    QString _case_path;    QString _screen_shot_path;    QString _video_path;    QString _display_value;    std::vector<QString> _groups = {         "CaseGroup",         "PathGroup"     };    std::vector<vector<QString>> _keynames = {        { "case_path" },        { "video_path", "screen_shot_path", "display_value" }    };};

2. ConFRouter.cpp

ConFRouter* ConFRouter::create_confrouter(const QString& path){    static ConFRouter* con_pointer = nullptr;    if (con_pointer == nullptr)    {        assert(path.size() != 0);        con_pointer = new ConFRouter(path);    }    return con_pointer;}ConFRouter::ConFRouter(const QString& path){    auto make_hashs = [](const std::vector<vector<QString>>& keynames,         const std::vector<vector<QString*>>& pointers) {        QHash<QString, QString*> hashs;        assert(keynames.size() == pointers.size());        for (size_t i = 0; i < keynames.size(); i++)        {            assert(keynames[i].size() == pointers[i].size());            for (size_t j = 0; j < keynames[i].size(); j++)                hashs.insert(keynames[i][j], pointers[i][j]);        }        return hashs;    };    auto set_defult = [=](const std::vector<vector<QString*>>& pointers,         const std::vector<vector<QString>> defaults) {        assert(defaults.size() == pointers.size());        for (size_t i = 0; i < pointers.size(); i++)        {            assert(defaults[i].size() == pointers[i].size());            for (size_t j = 0; j < pointers[i].size(); j++)                 *(pointers[i][j]) = defaults[i][j];        }    };    std::vector<vector<QString>> defaults = {        { path + "/vinci_case" },        { path + "/avi", path + "/screenshot", "0.03" }    };    std::vector<vector<QString*>> pointers = {        { &_case_path },        { &_video_path, &_screen_shot_path, &_display_value }    };    _root = path;    _find = make_hashs(_keynames, pointers);    set_defult(pointers, defaults);    this->read_file();}void ConFRouter::save_file(){    std::shared_ptr<QSettings> con = std::shared_ptr<QSettings>(        new QSettings(_root + "/settings.ini", QSettings::IniFormat),        [](QSettings *setting) {  delete setting;  }    );    for (size_t i = 0; i < _groups.size(); i++)    {        con->beginGroup(_groups[i]);        for (size_t j = 0; j < _keynames[i].size(); j++)            con->setValue(_keynames[i][j], (*this)[_keynames[i][j]]);        con->endGroup();    }    con->sync();}void ConFRouter::read_file(){    std::shared_ptr<QSettings> con = std::shared_ptr<QSettings>(        new QSettings(_root + "/settings.ini", QSettings::IniFormat),         [](QSettings *setting) {  delete setting;  }    );    for (size_t i = 0; i < _groups.size(); i++)    {        con->beginGroup(_groups[i]);        for (size_t j = 0; j < _keynames[i].size(); j++)        {            QString value = con->value(_keynames[i][j]).toString();            if (value.size() != 0)                (*this)[_keynames[i][j]] = value;        }        con->endGroup();    }}QString & ConFRouter::operator[](const QString & key){    auto pointer = this->_find.find(key);    assert(pointer != this->_find.end());    return *(pointer.value());}

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类的调用

1.mainWnd中声明Path

在创建mainWnd时候，在对应得appPath下创建setting.ini

#include "ConFRouter.h"...ConFRouter::create_confrouter(QApplication::applicationDirPath());

2.读取setting.ini
读取的信息为QString类型，需要我们自己对类型转换。

void CSettingDlg::read_iniFile(){    auto con = ConFRouter::create_confrouter();    QString screenShotPath = (*con)["screen_shot_path"];    QString videoPath = (*con)["video_path"];    QString displayValue = (*con)["display_value"];    if ((checkFloderPath(screenShotPath) == FloderPath::INVALID)) {        (*con)["screen_shot_path"] = this->_appPath;        screenShotPath = this->_appPath;    }    if ((checkFloderPath(videoPath) == FloderPath::INVALID)) {        (*con)["video_path"] = this->_appPath;        videoPath = this->_appPath;    }    bool ok;    displayValue.toDouble(&ok);    if (ok == false) {        (*con)["display_value"] = 0.3;        displayValue = 0.3;    }    con->save_file();    this->_screen_shot_edit->setText(screenShotPath);    this->_video_edit->setText(videoPath);    this->_display_box->setValue(displayValue.toDouble());}

3.修改setting.ini的内容

void CSettingDlg::write_iniFile(){    auto con = ConFRouter::create_confrouter();    QString screenShotPath = this->_screen_shot_edit->text();    QString videoPath = this->_video_edit->text();    double displayValue = this->_display_box->value();    (*con)["screen_shot_path"] = screenShotPath;    (*con)["video_path"] = videoPath;    (*con)["display_value"] = QString("%1").arg(displayValue);    con->save_file();}

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对路径的判断

读取到的路径，需要写入一个func判断路径是否合理。

int CSettingDlg::checkFloderPath(const QString path){    if (0 == path.size())        return FloderPath::INVALID;    QStringList allDirs;    if (path.contains("/"))         allDirs = path.split("/", QString::SkipEmptyParts);    else        allDirs = path.split("\\", QString::SkipEmptyParts);    QString dirPath = allDirs.at(0);    QFileInfo rootPath(dirPath + "/");    if (false == rootPath.isRoot())        return FloderPath::INVALID;    QDir dir;    for (size_t i = 1; i < allDirs.size(); i++)    {        dirPath = dirPath + "/" + allDirs.at(i);        if (false == dir.exists(dirPath)) {            if (false == dir.mkdir(dirPath))                return FloderPath::INVALID;        }    }    return FloderPath::VALID;}