摘要

mciSendString 录制WAV

MCI(Media Control Interface，媒体控制接口)函数中，有些只适用于一种接口方式，有些则两种接口都可以用。mciSendString只适用于命令串接口方式（命令串中不区分大小写）。

正文

基础设置

set wave bitpersample 8 //设置为8位

set wave samplespersec 11025 //设置为11025Hz

set wave channels 2 //设置为立体声

导入winmm.dll

C#
[DllImport("winmm.dll")]
private static extern uint mciSendString(string command, string returnValue, int returnLength, IntPtr winHandle);

开始录音

C#
DateTime startDate;
private void btnRecord_Click(object sender, EventArgs e)
{
    uint ret = 0;
    //ret=mciSendString("set wave samplespersec 11025", "", 0, IntPtr.Zero);
    ret = mciSendString("set wave channels 2", "", 0, IntPtr.Zero);
    ret = mciSendString("close record1", "", 0, IntPtr.Zero);
    ret = mciSendString("open new type WAVEAudio alias record1", "", 0, IntPtr.Zero);
    ret = mciSendString("record record1", "", 0, IntPtr.Zero);
    System.Timers.Timer timer = new System.Timers.Timer();
    timer.Interval = 1;
    timer.Elapsed += Timer_Elapsed;
    timer.Start();
    startDate = DateTime.Now;
}

保存文件

C#
private void btnSave_Click(object sender, EventArgs e)
{
    uint ret = 0;
    StringBuilder sb = new StringBuilder(32);
    ret = mciSendString("stop record1", "", 0, IntPtr.Zero);
    ret = mciSendString("save record1 d://a.wav","", 0, IntPtr.Zero);
    ret = mciSendString("close record1", "", 0, IntPtr.Zero);
}

C#
private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
    this.Invoke(new Action(() =>
    {
        DateTime enddate = DateTime.Now;
        TimeSpan timeSpan = enddate - startDate;
        this.lblRecord.Text = timeSpan.Minutes + ":" + timeSpan.Seconds + ":" + timeSpan.Milliseconds;
    }));
}