almos done. except that volume control has not been implemented.

PlayInterface.c

@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <Windows.h>
+#include <mmsystem.h>	// mci库头文件
+#pragma comment(lib, "winmm.lib")	// 指定MCI库，mciSendString函数的定义在winmm.lib中
+
+
+// 播放当前曲，曲号由curno记录
+void play(const char *name)          //播放音乐
+{
+	char cmd[MAX_PATH] = {0};
+	char pathname[MAX_PATH] = {0};
+
+	// 加路径
+	sprintf(pathname, ".\\music\\%s", name);
+	// GetShortPathName用来转换短名，要求被转换的歌名必须能在指定目录下找到文件，否则转换失败。
+	// 第一个参数：源文件名，第二个参数：目的文件名，第三个参数：目的数组长度。
+	GetShortPathName(pathname, pathname, MAX_PATH);
+
+
+	// 定义发往MCI的命令，cmd指定命令存储的数组，后面参数跟printf()相同
+	sprintf(cmd, "open %s", pathname);
+	// 发送命令。
+	// 一、存储命令的数组首地址，二、接受MCI返回的信息，三、接受数组的长度，四、没用，NULL
+	mciSendString(cmd, "", 0, NULL);
+	sprintf(cmd, "play %s", pathname);
+	mciSendString(cmd, "", 0, NULL);
+}
+
+
+// 暂停当前曲，曲号由curno记录
+void pause(const char *name)        // 暂停播放
+{
+	char cmd[MAX_PATH] = {0};
+	char pathname[MAX_PATH] = {0};
+	
+	// 加路径
+	sprintf(pathname, ".\\music\\%s", name);
+	// GetShortPathName用来转换短名，要求被转换的歌名必须能在指定目录下找到文件，否则转换失败。
+	// 第一个参数：源文件名，第二个参数：目的文件名，第三个参数：目的数组长度。
+	GetShortPathName(pathname, pathname, MAX_PATH);
+
+	sprintf(cmd, "pause %s", pathname);
+	mciSendString(cmd,"",0,NULL);
+}
+
+// 停止当前曲，曲号由curno记录
+void stop(const char *name)         
+{
+	char cmd[MAX_PATH] = {0};
+	char pathname[MAX_PATH] = {0};
+	
+	// 加路径
+	sprintf(pathname, ".\\music\\%s", name);
+	// GetShortPathName用来转换短名，要求被转换的歌名必须能在指定目录下找到文件，否则转换失败。
+	// 第一个参数：源文件名，第二个参数：目的文件名，第三个参数：目的数组长度。
+	GetShortPathName(pathname, pathname, MAX_PATH);
+
+	sprintf(cmd, "stop %s", pathname);
+	mciSendString(cmd,"",0,NULL); 
+	sprintf(cmd, "close %s", pathname);
+	mciSendString(cmd,"",0,NULL); 
+}

PlayInterface.h

@@ -0,0 +1,3 @@
+extern void play(const char *name);
+extern void pause(const char *name);
+extern void stop(const char *name);

fileHandler.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <io.h>
+#define MAX_SONG_NUM 200 
+
+extern char songs[MAX_SONG_NUM][50];
+
+//返回path路径下的.mp3文件数
+int getPlaylist(char *path)
+{
+	long Handle = 0;
+	int songNum = 0;
+	struct _finddata_t FileInfo;
+	//if((Handle=_findfirst(".\\music\\*.mp3",&FileInfo))==-1L)
+	if((Handle=_findfirst(strcat(path,"\\*.mp3"),&FileInfo))==-1L)
+	{
+		printf("没有找到匹配的项目\n");
+	}
+	else
+	{
+		strcpy(songs[++songNum],FileInfo.name);
+
+		printf("%d: %s\n",songNum,FileInfo.name);
+		while(_findnext(Handle,&FileInfo)==0 && songNum<MAX_SONG_NUM)
+		{
+			strcpy(songs[++songNum],FileInfo.name);
+			printf("%d: %s\n",songNum,FileInfo.name);
+		}
+		_findclose(Handle);
+	}
+	return songNum;
+}

fileHandler.h

@@ -0,0 +1,2 @@
+//返回path路径下的.mp3文件数
+extern int getPlaylist(char *path);

main.c

@@ -0,0 +1,213 @@
+#include <stdio.h>
+#include <windows.h>
+#include <time.h>
+#include <stdlib.h>
+#include "PlayInterface.h"
+#include "fileHandler.h"
+
+#define MAX_SONG_NUM 200
+
+char dir[20] = {0};
+
+//		0：停止
+//	 正数：正在播放
+//	 负数：正在暂停
+int playing = 0;
+int songNum = 0;
+boolean isRndPlay = 0;
+// 歌曲文件名数组
+char songs[MAX_SONG_NUM][50] = {""};
+
+void showstatus()
+{
+	if(isRndPlay)
+		printf("随机播放模式，");
+	else
+		printf("顺序播放模式，");
+	if (playing == 0)
+		printf("当前为停止状态\n");
+	else if (playing > 0)
+		printf("正在播放第%d曲:%s\n",playing,songs[playing]);
+	else
+		printf("正在暂停第%d曲:%s\n",-playing,songs[-playing]);
+}
+
+void playctrl(void){
+	while(1){
+		system("cls");
+		showstatus();
+		printf("1. 播放/暂停\
+			   \n2. 停止\
+			   \n3. 上一曲\
+			   \n4. 下一曲\
+			   \n5. 随机/顺序播放\
+			   \n0. 退出\
+			   \n请输入操作类型:\n");
+		switch (getch())
+		{
+		case '0':
+			return;
+			break;
+		case '1':
+			if(playing == 0)				//停止状态时按1播放第1曲
+			{
+				playing = (1 + isRndPlay * rand())%songNum;
+				if(playing == 0) playing = songNum;
+				play(songs[playing]);
+			}
+			else if(playing > 0)			//播放状态时暂停该曲
+			{
+				playing = -playing;
+				pause(songs[-playing]);
+			}
+			else							//暂停状态时播放该曲
+			{
+				playing = -playing;
+				play(songs[playing]);
+			}
+			break;
+		case '2':
+			stop(songs[playing]);
+			playing = 0;
+			break;
+		case '3':
+			if(playing > 1 && playing <= songNum)
+			{
+				stop(songs[playing]);
+				//playing--;
+				playing = (playing - 1 + isRndPlay * rand()) % songNum;
+				if(playing == 0) playing = songNum;
+				play(songs[playing]);
+			}
+			else if(playing < -1 && playing >= -songNum)
+			{
+				stop(songs[-playing]);
+				//playing = -playing - 1;
+				playing = (-playing-1 +isRndPlay*rand())%songNum;
+				if(playing == 0) playing = songNum;
+				play(songs[playing]);
+			}
+			else if(abs(playing) == 1)			//第1首上一曲为最后一首
+			{
+				stop(songs[1]);
+				playing = (songNum + isRndPlay * rand())%songNum;
+				if(playing == 0) playing = songNum;
+				play((songs[playing]));
+			}
+			else
+				printf("歌曲序号不正确，你一定是个垃圾程序员:)\n");
+				Sleep(1000);
+				while(kbhit()) getch();			//清除sleep期间的输入
+			break;
+		case '4':
+			if(playing >= 0 && playing < songNum)
+			{
+				stop(songs[playing]);
+				//playing++;
+				playing = (playing + 1 + isRndPlay * rand()) % songNum;
+				if(playing == 0) playing = songNum;
+				play(songs[playing]);
+			}
+			else if(playing < 0 && playing >= -songNum)
+			{
+				stop(songs[-playing]);
+				//playing = -playing + 1;
+				playing = (-playing + 1 +isRndPlay*rand())%songNum;
+				if(playing == 0) playing = songNum;
+				play(songs[playing]);
+			}
+			else if(abs(playing) == songNum)			//最后一首上一曲为第1首
+			{
+				stop(songs[abs(songNum)]);
+				//playing = 1;
+				playing = (1 + isRndPlay * rand())%songNum;
+				if(playing == 0) playing = songNum;
+				play((songs[playing]));
+			}
+			else
+				printf("歌曲序号不正确，你一定是个垃圾程序员:)\n");
+				Sleep(1000);
+				while(kbhit()) getch();			//清除sleep期间的输入
+				break;
+		case '5':
+			isRndPlay = !isRndPlay;
+			break;
+		default:
+			printf("非法输入!\n");
+			Sleep(1000);
+			while(kbhit()) getch();			//清除sleep期间的输入
+			break;
+		}
+	}
+}
+void volctrl(void){
+	while(1){
+		system("cls");
+		showstatus();
+		printf("1. 音量增大\
+			   \n2. 音量减小\
+			   \n0. 退出\
+			   \n请输入操作类型：\n");
+		switch(getch())
+		{
+		case '0':
+			return;
+			break;
+		case '1':
+			printf("vol_up called\n");
+			Sleep(1000);
+			break;
+		case '2':
+			printf("vol_down called\n");
+			Sleep(1000);
+			break;
+		default:
+			printf("非法输入!\n");
+			Sleep(1000);
+			while(kbhit()) getch();			//清除sleep期间的输入
+			break;
+		}
+	}
+}
+void killme(void){
+	exit(0);
+}
+
+int main(int argc, char **argv){
+	srand((unsigned)time(NULL));		//随机播放初始化
+	
+	while(songNum == 0)
+	{
+		printf("请输入MP3媒体路径:\n");
+		scanf("%s",&dir);
+		songNum = getPlaylist(&dir);
+		printf("path = %s,共%d首歌\n",&dir,songNum);
+	}
+	printf("请按任意键继续...\n");
+	getch();
+	while(1){
+		system("cls");
+		showstatus();
+		printf("1. 播放控制\
+				\n2. 音量调节\
+				\n0. 退出\
+				\n请输入操作类型：\n");
+		switch (getch())
+		{
+		case '0':
+			killme();
+		case '1':
+			playctrl();
+			break;
+		case '2':
+			volctrl();
+			break;
+		default:
+			printf("非法输入!\n"); 
+			Sleep(1000);
+			while(kbhit()) getch();			//清除sleep期间的输入
+			break;
+		}
+	}
+	return 0;
+}

vol.c

@@ -0,0 +1 @@
+//"setaudio %s volume to %d", device,vol;

vol.h

@@ -0,0 +1 @@
+extern void volup();