期末大作业：学生管理系统

mana_code/creategradeini.cpp

@@ -0,0 +1,196 @@
+#include <string>
+#include <iostream>
+#include <fstream>
+#include <map>
+#include <vector>
+#include <algorithm>
+using namespace std;
+
+class INIWriter {
+private:
+    string filename;
+    map<string, map<string, string>> config;
+    vector<string> sectionOrder; // 保持节的原始顺序
+
+    // 解析INI文件内容到config结构
+    void parseContent(const vector<string>& lines) {
+        string currentSection = "";
+
+        for (const auto& line : lines) {
+            string trimmed = trim(line);
+            if (trimmed.empty() || trimmed[0] == ';' || trimmed[0] == '#') {
+                continue; // 跳过注释和空行
+            }
+
+            if (trimmed[0] == '[' && trimmed.back() == ']') {
+                currentSection = trimmed.substr(1, trimmed.size() - 2);
+                if (config.find(currentSection) == config.end()) {
+                    sectionOrder.push_back(currentSection);
+                }
+            } else {
+                size_t pos = trimmed.find('=');
+                if (pos != string::npos) {
+                    string key = trim(trimmed.substr(0, pos));
+                    string value = trim(trimmed.substr(pos + 1));
+                    if (!currentSection.empty() && !key.empty()) {
+                        config[currentSection][key] = value;
+                    }
+                }
+            }
+        }
+    }
+
+    // 辅助函数：去除字符串两端空白
+    string trim(const string& str) {
+        size_t first = str.find_first_not_of(" \t");
+        if (first == string::npos) return "";
+        size_t last = str.find_last_not_of(" \t");
+        return str.substr(first, (last - first + 1));
+    }
+
+public:
+    INIWriter() {}
+
+    // 设置INI文件名（用于后续操作）
+    void setFileName(const string& name) {
+        filename = name;
+    }
+
+    // 读取INI文件到内存
+    bool readFile() {
+        ifstream file(filename);
+        if (!file.is_open()) {
+            cout << "Unable to open file: " << filename << endl;
+            return false;
+        }
+
+        vector<string> lines;
+        string line;
+        while (getline(file, line)) {
+            lines.push_back(line);
+        }
+        file.close();
+
+        config.clear();
+        sectionOrder.clear();
+        parseContent(lines);
+        return true;
+    }
+
+    // 写入INI文件
+    bool writeFile() {
+        if (filename.empty()) {
+            cout << "Filename not set" << endl;
+            return false;
+        }
+
+        ofstream file(filename);
+        if (!file.is_open()) {
+            cout << "Unable to open file: " << filename << endl;
+            return false;
+        }
+
+        for (const auto& section : sectionOrder) {
+            if (config.find(section) != config.end()) {
+                file << "[" << section << "]" << endl;
+                for (const auto& kv : config[section]) {
+                    file << kv.first << "=" << kv.second << endl;
+                }
+                file << endl; // 节之间添加空行
+            }
+        }
+
+        file.close();
+        cout << "File written: " << filename << endl;
+        return true;
+    }
+
+    // 设置值
+    void setValue(const string& section, const string& key, const string& value) {
+        if (config.find(section) == config.end()) {
+            sectionOrder.push_back(section); // 添加新节到顺序列表
+        }
+        config[section][key] = value;
+    }
+
+    // 删除整个节
+    bool removeSection(const string& section) {
+        auto secIt = config.find(section);
+        if (secIt != config.end()) {
+            config.erase(secIt);
+
+            // 从顺序列表中移除
+            auto pos = find(sectionOrder.begin(), sectionOrder.end(), section);
+            if (pos != sectionOrder.end()) {
+                sectionOrder.erase(pos);
+            }
+            return true;
+        }
+        return false;
+    }
+
+    // 删除特定键
+    bool removeKey(const string& section, const string& key) {
+        auto secIt = config.find(section);
+        if (secIt != config.end()) {
+            auto& keyMap = secIt->second;
+            auto keyIt = keyMap.find(key);
+            if (keyIt != keyMap.end()) {
+                keyMap.erase(keyIt);
+                return true;
+            }
+        }
+        return false;
+    }
+};
+
+int main() {
+    INIWriter writer;
+    string filename;
+    cout << "Enter filename (without extension): ";
+    cin >> filename;
+    writer.setFileName(filename + ".ini");
+
+    // 1. 先创建文件（如果不存在）
+    if (!writer.writeFile()) {
+        cerr << "Failed to create file!" << endl;
+        return 1;
+    }
+
+    // 2. 读取文件
+    if(!writer.readFile()) {
+        cerr << "Failed to read file!" << endl;
+        return 1;
+    }
+
+    cout << "File read successfully." << endl;
+
+    // 3. 设置新值
+    cin.ignore(); // 清除输入缓冲区
+
+    while (true) {
+        string section, key, value;
+
+        cout << "\nEnter section name (or 'exit' to quit): ";
+        getline(cin, section);
+        if (section == "exit") break;
+
+        cout << "Enter key: ";
+        getline(cin, key);
+
+        cout << "Enter value: ";
+        getline(cin, value);
+
+        writer.setValue(section, key, value);
+        cout << "Set " << section << "." << key << " = " << value << endl;
+
+        // 4. 立即保存更改
+        if (!writer.writeFile()) {
+            cerr << "Failed to save changes!" << endl;
+        } else {
+            cout << "Changes saved!" << endl;
+        }
+    }
+
+    return 0;
+}