DEV-C++easyx图形库添加音乐为什么会报错？

Question

我在用DEV-C++写easyx图形库代码时，添加背景音乐的代码怎么会报错？求指教。
代码：

#include<graphics.h>
#include<conio.h>
#include<bits/stdc++.h>
#pragma comment(lib,"Winmm.lib")
void loading(){
    settextstyle(20,0,"楷体"); 
    settextcolor(YELLOW);
    int ans=3;
    while(ans!=0){
        ans--;
        outtextxy(190,230,"正在加载中");
        for(int i=300;i<360;i+=20) {
            outtextxy(i,230,". ");
            Sleep(1000);
        }
        cleardevice();
    }
}
void BGM(){
    mciSendString(L"open .\marro.mp3 alias bkmusic",NULL,0,NULL);
    mciSendString(L"play bkmusic repeat", NULL, 0, NULL);
}
int main()
{
    initgraph(500,500);
    loading();
    BGM();
    getch();
    closegraph();
    return 0;
}

报错图片：

Answer 1

#include<windows.h>
mciSendStringW(L"open .\\marro.mp3 alias bkmusic",NULL,0,NULL);