[英]C# trackbar mciSendString
在Simple MCI Player-CodeProject中 ,进行了少许更改:
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;
}
在VB中,我是在Timer Tick Sub内部完成此操作的。
rem音频是最重要的mcisendstring rem TotalLength是当前曲目的总秒数
Dim PlayPosition As Long = 0
PlayPosition = audio.SecondsPlayed
If PlayPosition > 0 And PlayPosition < TotalLength Then
TrackBar1.Value = (PlayPosition / TotalLength) * TotalLength
End If
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