用vs写一段解析DBC的程序

DBC是一种CAN网络通信协议，在使用CAN通信时需要解析DBC文件。以下是一个使用Visual Studio编写的解析DBC文件的示例程序：

#include <iostream>
#include <fstream>
#include <string>
#include <vector>

using namespace std;

struct DBCMessage {
    string name;
    int id;
    vector<string> signals;
};

struct DBCSignal {
    string name;
    int start_bit;
    int bit_length;
    double factor;
    double offset;
    double min_value;
    double max_value;
    string unit;
};

int main() {
    // 打开DBC文件
    ifstream file("example.dbc");
    if (!file.is_open()) {
        cout << "Error: failed to open file." << endl;
        return 1;
    }

    // 解析DBC文件
    vector<DBCMessage> messages;
    vector<DBCSignal> signals;
    string line;
    while (getline(file, line)) {
        // 解析消息定义
        if (line.substr(0, 3) == "BO_") {
            size_t pos1 = line.find(' ');
            size_t pos2 = line.find(':', pos1);
            size_t pos3 = line.find('\"', pos2);
            size_t pos4 = line.find('\"', pos3 + 1);
            int id = stoi(line.substr(pos1 + 1, pos2 - pos1 - 1));
            string name = line.substr(pos3 + 1, pos4 - pos3 - 1);
            messages.push_back({name, id, {}});
        }
        // 解析信号定义
        else if (line.substr(0, 3) == "SG_") {
            size_t pos1 = line.find(' ');
            size_t pos2 = line.find(':', pos1);
            size_t pos3 = line.find('|', pos2);
            size_t pos4 = line.find('@', pos3);
            size_t pos5 = line.find('+', pos4);
            size_t pos6 = line.find('-', pos5);
            size_t pos7 = line.find('[', pos6);
            size_t pos8 = line.find(']', pos7);
            size_t pos9 = line.find('\"', pos8);
            size_t pos10 = line.find('\"', pos9 + 1);
            string name = line.substr(pos1 + 1, pos2 - pos1 - 1);
            int start_bit = stoi(line.substr(pos3 + 1, pos4 - pos3 - 1));
            int bit_length = stoi(line.substr(pos4 + 1, pos5 - pos4 - 1));
            double factor = stod(line.substr(pos5 + 1, pos6 - pos5 - 1));
            double offset = stod(line.substr(pos6 + 1, pos7 - pos6 - 1));
            double min_value = stod(line.substr(pos7 + 1, pos8 - pos7 - 1));
            double max_value = stod(line.substr(pos8 + 1, pos9 - pos8 - 1));
            string unit = line.substr(pos9 + 1, pos10 - pos9 - 1);
            signals.push_back({name, start_bit, bit_length, factor, offset, min_value, max_value, unit});
            messages.back().signals.push_back(name);
        }
    }

    // 输出解析结果
    for (auto& message : messages) {
        cout << "Message: " << message.name << " (ID: " << message.id << ")" << endl;
        for (auto& signal_name : message.signals) {
            for (auto& signal : signals) {
                if (signal.name == signal_name) {
                    cout << "  Signal: " << signal.name << " (start bit: " << signal.start_bit;
                    cout << ", length: " << signal.bit_length << ", factor: " << signal.factor;
                    cout << ", offset: " << signal.offset << ", min value: " << signal.min_value;
                    cout << ", max value: " << signal.max_value << ", unit: " << signal.unit << ")" << endl;
                }
            }
        }
    }

    return 0;
}

该程序首先打开DBC文件，然后按行读取文件内容，并根据行内容解析消息定义和信号定义。程序使用两个结构体分别表示消息和信号，其中消息包含名称、ID和包含的信号列表，信号包含名称、起始位、长度、因子、偏移量、最小值、最大值和单位。程序最后输出解析结果，包括每个消息的名称、ID和包含的信号列表，以及每个信号的名称、起始位、长度、因子、偏移量、最小值、最大值和单位。

注意，此示例程序仅适用于包含消息定义和信号定义的DBC文件，如果文件还包含其他信息，则需要进行相应修改。