C++播放音乐

2020-07-08

C++播放音乐

环境准备

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#include <windows.h>
#include <mmsystem.h>
#pragma comment(lib,"winmm.lib")

这三行是不可或缺的，最好顺序都不要变
如果运行的时候报错的话，还需要自己去找 MinGW\\lib\\libwinmm.a
codeblocks还需要一些设置，打开settings -> Compiler -> Global compiler settings -> linker settings
点击add，浏览找到libwinmma.a然后一路ok就好

同级目录准备

创建一个txt保存歌曲信息，创建一个文件夹Music用来保存MP3文件
其中txt文件需要用ANSI编码，不然会有乱码，运行就会出错
但是改了编码之后，我就只能用电脑自带的文本编辑器看了，sublime打开会是乱码，烦的雅痞
txt里的信息是自己手动添加的，歌曲名一定要和Music里的文件一样，这里有亿点点坑，因为我懒得找度娘了

然后，上代码

其中遇到的一点问题就是，我从网易云直接下载的MP3文件听不了，但是我录下来在转的MP3文件就可以，不解

#include <bits/stdc++.h>
#include <conio.h>
#include <time.h>
#include <windows.h>
#include <mmsystem.h>
#pragma comment(lib,"winmm.lib")
using namespace std;

class Music {
private:
    string path;
    string name;
    string singerName;
public:
    Music(string path, string name, string singerName): path(path), name(name), singerName(singerName){}
    void SetPath(string pat) { path = pat; }
    string GetPath() { return path; }
	void SetName(string nam) { name = nam; }
    string GetName() { return name; }
	void SetSingerName(string sin) { singerName = sin; }
    string GetSingerName() { return singerName; }
};

class MusicManager {
private:
	std::vector<Music> music;
	string PlayingMusic;
	string playingMusicPath;
	char ppath[50];
	MCI_OPEN_PARMS op;	///打开MCI设备
	MCI_PLAY_PARMS pp;
public:
	///开始运行
	void Start() {
	    Init();
	    ReadMusicList();
        ///只要主菜单没有quit就一直运行
	    while (Menu() != 0);
	}

	///主菜单
	int Menu() {
	    system("cls");
		cout << "press z playing/change music" << endl;
		cout << "press x inquire music" << endl;
		cout << "prsss q quit" << endl;

		while (true) {
			int key = getch();
			if (key == 'z')	{
				PlaySongsMenu();
				return 1;
			}
			if (key == 'x') {
				ShowMusicList();
				cout << "press q quit" << endl;
                while (getch() != 'q');
				return 2;
			}
			if (key == 'q')		return 0;
		}
	}

	///选歌环节
	void ChooseMusic() {
        ShowMusicList();
        int id;
        cout << "input music id:";
        cin >> id;
        mciSendCommand (op.wDeviceID, MCI_STOP, NULL, (DWORD)&pp);
        ChangeMusic(id - 1);
        mciSendCommand (op.wDeviceID, MCI_PLAY, MCI_FROM, (DWORD)&pp);
	}

	///听歌界面
	void PlaySongsMenu() {
	    ChooseMusic();
	    system("cls");
		cout << "Playing Music:" << PlayingMusic << endl;
		cout << "press w playing" << endl;
		cout << "press p pause" << endl;
		cout << "press r resume" << endl;
		cout << "press s stop" << endl;
		cout << "press q quit" << endl;
		cout << "press c change music" << endl;

		while (true) {
            if (kbhit()) {
                int key = getch();
                if (key == 'q')		return ;
                if (key == 'w') {
                    mciSendCommand (op.wDeviceID, MCI_PLAY, MCI_FROM, (DWORD)&pp);
                }
                if (key == 'r') {
                    mciSendCommand (op.wDeviceID, MCI_RESUME, NULL, (DWORD)&pp);
                }
                if (key == 's') {
                    mciSendCommand (op.wDeviceID, MCI_STOP, NULL, (DWORD)&pp);
                }
                if (key == 'p') {
                    mciSendCommand (op.wDeviceID, MCI_PAUSE, NULL, (DWORD)&pp);
                }
                if (key == 'c') {
                    PlaySongsMenu();
                    return ;
                }
			}
		}
	}

	///初始化
	void Init() {
	    op.dwCallback = NULL;
	    op.lpstrAlias = NULL;
	    op.lpstrDeviceType = ("MPEGAudio");     ///设备类型，大多数文件可以这样设置
	    ///op.lpstrElementName = (ToChars(playingMusicPath));   ///文件路径
	    op.wDeviceID = NULL;  ///打开设备成功以后保存这个设备号备用

	    pp.dwCallback = NULL;
    	pp.dwFrom = 0;                       //开始播放的位置

    	op.lpstrElementName = ("E:\\best.mp3");
    	mciSendCommand(NULL,MCI_OPEN,MCI_OPEN_ELEMENT ,(DWORD)&op);
	}

	///string转char数组，lpstrElementName是char*这我是真没想到
	char* ToChars(string str) {
		strcpy(ppath, str.c_str());
		return ppath;
	}

	///读取music_list.txt中的歌单信息
	void ReadMusicList() {
		fstream file;
		file.open("music_list.txt", ios::in);
		string a, b;
		while (file >> a >>b) {
			music.push_back(Music("Music\\" + a + ".mp3", a, b));
		}
		file.close();
	}

	///展示歌单
	void ShowMusicList() {
		system("cls");
		cout << "total " << music.size() << " musics" << endl;
		for (int i = 0; i < music.size(); i++) {
			cout << i + 1 << " " << music[i].GetName() << " " << music[i].GetSingerName() << endl;
		}
	}

	///切换歌曲
	void ChangeMusic(int ID) {
        if (ID >= music.size()) return;

        playingMusicPath = music[ID].GetPath();
        op.lpstrElementName = ToChars(playingMusicPath);
        PlayingMusic = music[ID].GetName();
        pp.dwFrom = 0;
        mciSendCommand(NULL,MCI_OPEN,MCI_OPEN_ELEMENT ,(DWORD)&op);
	}

};

int main () {
	MusicManager mm;
	mm.Start();
    return 0;
}