1、添加配置文件读、写、解析类Configfile（使用libconfig.h++）;

2、打开相机时，通过Configfile读取和解析配置文件，并使用；
3、修复一些代码逻辑bug；

Source_Files/configfile.cpp

@@ -0,0 +1,240 @@
+//
+// Created by tangchao on 2022/6/28.
+//
+
+#include "Header_Files/configfile.h"
+
+Configfile::Configfile()
+{
+
+}
+
+void Configfile::setConfigfilePath(string configfilePath)
+{
+    m_configfilePath = configfilePath;
+}
+
+
+int Configfile::parseConfigfile()
+{
+    // Read the file. If there is an error, report it and exit.
+    try
+    {
+        cfg.readFile(m_configfilePath);
+    }
+    catch(const FileIOException &fioex)
+    {
+        std::cerr << "I/O error while reading file." << std::endl;
+        return(EXIT_FAILURE);
+    }
+    catch(const ParseException &pex)
+    {
+        std::cerr << "Parse error at " << pex.getFile() << ":" << pex.getLine()
+                  << " - " << pex.getError() << std::endl;
+        return(EXIT_FAILURE);
+    }
+}
+
+bool Configfile::getBin(int &bin)
+{
+    try
+    {
+        bin = cfg.lookup("bin");
+
+        return(EXIT_SUCCESS);
+    }
+    catch(const SettingNotFoundException &nfex)
+    {
+        cerr << "No 'bin' setting in configuration file." << endl;
+        return(EXIT_FAILURE);
+    }
+}
+
+bool Configfile::getEffectiveWindow(int &width, int &offsetx, int &height, int &offsety)
+{
+    const Setting& root = cfg.getRoot();
+
+    // Output a list of all books in the inventory.
+    try
+    {
+        const Setting &effective_window = root["effective_window"];
+        int count = effective_window.getLength();
+
+        int bin;
+        getBin(bin);
+
+        const Setting &window = effective_window[bin-1];
+        string name = window.getName();
+
+        if(!(window.lookupValue("width", width)
+             && window.lookupValue("offsetx", offsetx)
+             && window.lookupValue("height", height)
+             && window.lookupValue("offsety", offsety)))
+        {
+            return(EXIT_FAILURE);
+        }
+    }
+    catch(const SettingNotFoundException &nfex)
+    {
+        // Ignore.
+        int a=1;
+    }
+
+    return(EXIT_SUCCESS);
+}
+
+bool Configfile::getGainOffset(float &gain, float &offset)
+{
+    const Setting& root = cfg.getRoot();
+
+    // Output a list of all books in the inventory.
+    try
+    {
+        const Setting &gainOffset = root["gainOffset"];
+        int count = gainOffset.getLength();
+
+        int bin;
+        getBin(bin);
+
+        const Setting &gainOffsetSetting = gainOffset[bin-1];
+        string name = gainOffsetSetting.getName();
+
+        if(!(gainOffsetSetting.lookupValue("gain", gain)
+             && gainOffsetSetting.lookupValue("offset", offset)))
+        {
+            return(EXIT_FAILURE);
+        }
+    }
+    catch(const SettingNotFoundException &nfex)
+    {
+        // Ignore.
+        int a=1;
+    }
+
+    return(EXIT_SUCCESS);
+}
+
+int Configfile::createConfigFile()
+{
+    using namespace std;
+    using namespace libconfig;
+
+    static const char *output_file = "ximea.cfg";
+    Config cfg;
+
+    Setting &root = cfg.getRoot();
+
+    // Add some settings to the configuration.
+    Setting &bin = root.add("bin", Setting::TypeInt) = 1;
+    Setting &SN = root.add("SN", Setting::TypeString) = "0098";
+
+    Setting &effective_window = root.add("effective_window", Setting::TypeGroup);
+    Setting &effective_windowBin1 = effective_window.add("bin1", Setting::TypeGroup);
+    Setting &effective_windowBin2 = effective_window.add("bin2", Setting::TypeGroup);
+
+    effective_windowBin1.add("width", Setting::TypeInt) = 1;
+    effective_windowBin1.add("offsetx", Setting::TypeInt) = 2;
+    effective_windowBin1.add("height", Setting::TypeInt) = 3;
+    effective_windowBin1.add("offsety", Setting::TypeInt) = 4;
+
+    effective_windowBin2.add("width", Setting::TypeInt) = 5;
+    effective_windowBin2.add("offsetx", Setting::TypeInt) = 6;
+    effective_windowBin2.add("height", Setting::TypeInt) = 7;
+    effective_windowBin2.add("offsety", Setting::TypeInt) = 8;
+
+    Setting &gainOffset = root.add("gainOffset", Setting::TypeGroup);
+    Setting &gainOffsetBin1 = gainOffset.add("bin1", Setting::TypeGroup);
+    Setting &gainOffsetBin2 = gainOffset.add("bin2", Setting::TypeGroup);
+
+    gainOffsetBin1.add("gain", Setting::TypeFloat) = 9.12;
+    gainOffsetBin1.add("offset", Setting::TypeFloat) = -10.2;
+
+    gainOffsetBin2.add("gain", Setting::TypeFloat) = 11.789;
+    gainOffsetBin2.add("offset", Setting::TypeFloat) = -12.58;
+
+
+    // Write out the new configuration.
+    try
+    {
+        cfg.writeFile(output_file);
+        cerr << "New configuration successfully written to: " << output_file << endl;
+
+    }
+    catch(const FileIOException &fioex)
+    {
+        cerr << "I/O error while writing file: " << output_file << endl;
+        return(EXIT_FAILURE);
+    }
+
+    return(EXIT_SUCCESS);
+}
+
+int Configfile::updateConfigFile()
+{
+    using namespace std;
+    using namespace libconfig;
+
+    static const char *output_file = "updated.cfg";
+
+    Config cfg;
+
+    cfg.setOptions(Config::OptionFsync
+                   | Config::OptionSemicolonSeparators
+                   | Config::OptionColonAssignmentForGroups
+                   | Config::OptionOpenBraceOnSeparateLine);
+
+    // Read the file. If there is an error, report it and exit.
+    try
+    {
+        cfg.readFile("example.cfg");
+    }
+    catch(const FileIOException &fioex)
+    {
+        std::cerr << "I/O error while reading file." << std::endl;
+        return(EXIT_FAILURE);
+    }
+    catch(const ParseException &pex)
+    {
+        std::cerr << "Parse error at " << pex.getFile() << ":" << pex.getLine()
+                  << " - " << pex.getError() << std::endl;
+        return(EXIT_FAILURE);
+    }
+
+    // Find the 'movies' setting. Add intermediate settings if they don't yet
+    // exist.
+    Setting &root = cfg.getRoot();
+
+    if(! root.exists("inventory"))
+        root.add("inventory", Setting::TypeGroup);
+
+    Setting &inventory = root["inventory"];
+
+    if(! inventory.exists("movies"))
+        inventory.add("movies", Setting::TypeList);
+
+    Setting &movies = inventory["movies"];
+
+    // Create the new movie entry.
+    Setting &movie = movies.add(Setting::TypeGroup);
+
+    movie.add("title", Setting::TypeString) = "Buckaroo Banzai";
+    movie.add("media", Setting::TypeString) = "DVD";
+    movie.add("price", Setting::TypeFloat) = 12.99;
+    movie.add("qty", Setting::TypeInt) = 20;
+
+    // Write out the updated configuration.
+    try
+    {
+        cfg.writeFile(output_file);
+        cerr << "Updated configuration successfully written to: " << output_file
+             << endl;
+
+    }
+    catch(const FileIOException &fioex)
+    {
+        cerr << "I/O error while writing file: " << output_file << endl;
+        return(EXIT_FAILURE);
+    }
+
+    return(EXIT_SUCCESS);
+}