MCI播放mp3音乐为什么只有一次

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代码如下
UINT PlayMusic()
{

char buf[128];
char str[128] ={0} ;
int i = 0;

MCI_OPEN_PARMS mciOpen;
MCI_PLAY_PARMS mciPlay;
MCIERROR mciError;
SetWindowText(NULL,"12345");

mciOpen.lpstrDeviceType = "mpegvideo";
mciOpen.lpstrElementName = "E:\\我的U盘\\项目源代码\\BitmapWindow2-位图画刷\\Debug\\苍蝇飞舞声音.mp3";

mciError = mciSendCommand(0,MCI_OPEN,MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,(DWORD)&mciOpen);
if(mciError)
{
mciGetErrorString(mciError,buf,128);
printf("send MCI_OPEN command failed:%s\n",buf);
return 0;
}
UINT DeviceID = mciOpen.wDeviceID ;


mciError = mciSendCommand(DeviceID,MCI_PLAY,0 ,(DWORD)&mciPlay);
if(mciError)
{
printf("send MCI_PLAY command failed\n");
return 0;
}
return DeviceID;
}
我在一个线程中第一次调用这个函数的时候可以播放音乐 但是第二次就不行了 为什么啊