C＃trackbar mciSendString

Question

我正在使用MCI編寫CD音頻播放器程序，但無法在音軌上顯示音頻文件的進度。

有誰知道如何？

請注意，我必須使用mciSendString來獲取曲目長度。

Answer 1

從Simple MCI Player - CodeProject，稍微改動：

public int GetCurrentPosition() 
{ 
    String command = "status MediaFile position"; 
    error = mciSendString(command, returnData, 
          returnData.Capacity, IntPtr.Zero); 
    return error == 0 ? int.Parse(returnData.ToString()) : 0; 
} 

public int GetSongLenght() 
{ 
    if (IsPlaying()) 
    { 
     String command = "status MediaFile length"; 
     error = mciSendString(command, returnData, returnData.Capacity, IntPtr.Zero); 
     return error == 0 ? int.Parse(returnData.ToString()) : 0; 
    } 
    else 
     return 0; 
} 

Answer 2

在VB中我做了這個一個計時器滴答子裏面...易peasy真的...

REM音頻是mcisendstring啄 REM TotalLength是當前曲目的總秒數

Dim PlayPosition As Long = 0 

    PlayPosition = audio.SecondsPlayed 
    If PlayPosition > 0 And PlayPosition < TotalLength Then 
     TrackBar1.Value = (PlayPosition/TotalLength) * TotalLength 
    End If