C++ 分析歌词(LRC)文件

初学C++,练习代码

#include "stdafx.h"
#include <iostream>
#include <fstream>
using namespace std;
/*
**简单歌词分析:
**根据开始时间和结束时间 来显示
*/

void readLyric(string fileName);
void analysisOneLine(string str);
void printLyric();
void getLyricHeader(string str);
int  changeStringToInt(string str_time);
void timeSort();

const int MAX_LYRIC_LINE_NUM =200;
const int MAX_LYRCE_REPEAT_NUM = 10;
string header[] = {"ai:", "ar:", "al:", "by:"};
int lineNum = 0;
string Lheader[4];

struct OneLineLyric
{
    int lineNum;
    string startTime;
    string endTime;
    string lyricContent;
} lyric[MAX_LYRIC_LINE_NUM ]; //动态分配最好


void readLyric(string fileName)
{

    ifstream fin;
    fin.open(fileName);
    if(!fin.is_open())
    {
        cerr << "文件读取失败!\n";
        exit(0);
    }
    string str;
    getline(fin, str);
    while(fin)
    {
        if(str != "")
        {
            analysisOneLine(str);
        }
        getline(fin, str);
    }

    fin.close();
    printLyric();
}

//分析一行 保存到结构体数组
void analysisOneLine(string str)
{
    if(str[0] != '[')
    {
        cout << "歌词文件格式不正规!\n";
    }

    //歌词说明 ti:歌曲名称 ar:演唱者 al: by: 制作单位
	getLyricHeader(str);

    int m, n, p = 0;
    string timeTemp[MAX_LYRCE_REPEAT_NUM];//保存信息
    m = str.find_first_of('[');
    n = str.find_first_of(']');
    while(m >= 0 && m <= str.length() && n >= 0 && n <= str.length() && str != "")
    {
        timeTemp[p] = str.substr(m + 1, n - 1);
        p++;
        str = str.substr(n + 1, str.length());
        m = str.find_first_of('[');
        n = str.find_first_of(']');
    }

    string contentTemp = str;

    for(int i = 0; i < p; i++)
    {
        if(lineNum == 1)
        {
            cout << endl;
        }
        lyric[lineNum].startTime = timeTemp[i];

        if(timeTemp[i + 1] != "") //连续的
        {
            lyric[lineNum].endTime = timeTemp[i + 1];
            cout << timeTemp[i] << endl;
        }

        if(lineNum - 1 >= 0 && i == 0) //设置上一个的endTime
            lyric[lineNum - 1].endTime = lyric[lineNum].startTime;
        lyric[lineNum].lineNum = lineNum;
        lyric[lineNum].lyricContent = contentTemp;
        lineNum++;
    }

}

void getLyricHeader(string str)
{
    for(int i = 0; i < 4; i++)
    {
        if(header[i] == str.substr(1, 3))
        {
            Lheader[i] = str;
        }
    }
}

//显示数据
void printLyric()
{
    cout << "歌曲信息:" << endl;
    for(int i = 0; i < 4; i++)
    {
        cout << Lheader[i] << endl;
    }

    for(int i = 0; i < lineNum; i++)
    {
        if(lyric[i].startTime != "")
        {
            cout << "行    号:\t" << lyric[i].lineNum << endl;
            cout << "开始时间:\t" << lyric[i].startTime << endl;
            cout << "结束时间:\t" << lyric[i].endTime << endl;
            cout << "歌词内容:\t" << lyric[i].lyricContent << endl;
            cout << endl;
        }
    }
}

//将时间转换成毫秒
int changeStringToInt(string str_time)
{
    int time, min, sec, msc = 0; //分钟,秒,毫秒 转换成毫秒
    min = atof(const_cast<const char *>(str_time.substr(0, 2).c_str()));
    sec = atof(const_cast<const char *>(str_time.substr(3, 2).c_str()));
    if(str_time.length() > 5)
        msc = atof(const_cast<const char *>(str_time.substr(4, 2).c_str()));
    time = min * 60 * 100 + sec * 100 + msc;
    return time;
}