VC++ 中简单操作MP3音乐的方法,小结

#include <windows.h>
#include <stdio.h>
#include <mmsystem.h>
#include <shellapi.h>
#include <AFXCOM_.H>
#pragma comment(lib,"winmm.lib")
void main()
{

char str[128]={0};
int i = 0;
 char buf[128]={0}; 
 MCI_OPEN_PARMS mciOpen;
 MCIERROR mciError;
 mciOpen.lpstrDeviceType = "mpegvideo";
 mciOpen.lpstrElementName = "c://1.mp3"; 
 mciError = mciSendCommand(0,MCI_OPEN,MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,(DWORD)&mciOpen);
 if(mciError)
 {
  mciGetErrorString(mciError,buf,128);
  printf("%s/n",buf);
  goto Error;
 }
 UINT DeviceID = mciOpen.wDeviceID ;
 MCI_PLAY_PARMS mciPlay; 
 mciError = mciSendCommand(DeviceID,MCI_PLAY,0 ,(DWORD)&mciPlay);
 if(mciError)
 {
  printf("send MCI_PLAY command failed/n");
  goto Error;
 }
//WinExec("sndvol32.exe",SW_SHOWNORMAL);
//这个可以打开音量控制不过可以用编程实现。
 
 while(1)
 {
  sprintf(str,"播放时间:/t%d",i);
  printf("%s/r",str);
  i++;
  Sleep(1000);
 }
Error:
 system("pause");
 
}

使用mci播放MP3
主要变量定义

MCI_OPEN_PARMS mciOpen;
MCIERROR mciError;
MCI_STATUS_PARMS mciStatusParms;
WORD m_wDeviceID;

这里只介绍mciSendCommand命令

0.打开设备

mciError = mciSendCommand(0,MCI_OPEN,MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,(DWORD)&mciOpen); 

在打开设备后,就获取了设备的ID,后面的所有操作,都必须要使用这个ID号,即: 

UINT DeviceID = mciOpen.wDeviceID ;

1.播放

MCI_PLAY_PARMS mciPlay;
mciOpen.lpstrDeviceType = "mpegvideo";
mciOpen.lpstrElementName =fileName.GetString();
    mciError = mciSendCommand(m_wDeviceID,MCI_PLAY,0 ,(DWORD)&mciPlay);

//这里的 m_wDeviceID 是在 打开设备时,获取的设备ID

2.暂停

mciSendCommand(mciOpen.wDeviceID,MCI_PAUSE,NULL ,NULL);

3. 停止

mciSendCommand(mciOpen.wDeviceID,MCI_STOP,NULL ,NULL);
mciSendCommand(mciOpen.wDeviceID,MCI_SEEK,MCI_SEEK_TO_START ,NULL);

4.获得播放进度

mciStatusParms.dwItem=MCI_STATUS_POSITION;    
mciSendCommand(m_wDeviceID,MCI_STATUS,MCI_WAIT|MCI_STATUS_ITEM,(DWORD)(LPVOID)&mciStatusParms);//关键,取得位置
    int m_dPosition=mciStatusParms.dwReturn;

5.获得整个音频的时间长度

UINT DeviceID = mciOpen.wDeviceID ;
 mciStatusParms.dwItem=MCI_STATUS_LENGTH; 
 mciSendCommand(DeviceID,MCI_STATUS,MCI_WAIT|MCI_STATUS_ITEM,(DWORD)(LPVOID)&mciStatusParms);//关键,取得长度
     m_dLength=mciStatusParms.dwReturn;

6.在指定位置播放
 

MCI_PLAY_PARMS mciPlay;
 mciPlay.dwFrom=m_dPosition;
 mciError = mciSendCommand(m_wDeviceID,MCI_PLAY,MCI_FROM,(DWORD)&mciPlay);

 
7.控制音量

MCI_DGV_SETAUDIO_PARMS mciSetAudioPara;  
mciSetAudioPara.dwItem = MCI_DGV_SETAUDIO_VOLUME;
mciSetAudioPara.dwValue = atoi(m_Volume.GetBuffer(m_Volume.GetLength())); //here is the value of the Volume(0--1000)  
mciSendCommand(m_wDeviceID, MCI_SETAUDIO, MCI_DGV_SETAUDIO_VALUE | MCI_DGV_SETAUDIO_ITEM, (DWORD)(LPVOID)&mciSetAudioPara);