Naudio StreamMixToDisk error

本文关键字：error StreamMixToDisk Naudio | 更新日期: 2023-09-27 18:07:27

我在输入wav文件名并让nAudio接受它为StreamMixToDisk时遇到问题。

Public Sub SetupAudio()
    'Setup the Mixer
    mixer = New WaveMixerStream32()
    mixer.AutoStop = False
    If waveOutDevice Is Nothing Then
        'waveOutDevice = new AsioOut();
        waveOutDevice = New WaveOut(0, 300, False)
        waveOutDevice.Init(mixer)
        waveOutDevice.Play()
    End If
End Sub
Private Sub cmbRecordDirect_Click(sender As Object, e As EventArgs) Handles cmbRecord.Click
    Dim saveFileDialog As New SaveFileDialog()
    saveFileDialog.Title = "Select output file:"
    saveFileDialog.Filter = "WAV Files (*.wav)|*.wav"
    saveFileDialog.FileName = outputFilename
    If saveFileDialog.ShowDialog() = DialogResult.OK Then
        outputFilename = saveFileDialog.FileName
        mixer.StreamMixToDisk(outputFilename)
        mixer.StartStreamingToDisk()
        cmbRecordDirect.Enabled = False
        cmbStopDirect.Enabled = True
        cmbPauseDirect.Enabled = True
    End If
End Sub

outputFilename是c:'test.wav但是一旦它到达mixer.StreamMixToDisk(outputFilename)它有一个错误说:

A first chance exception of type 'System.NullReferenceException'
Object reference not set to an instance of an object.
上面转换为VB.net的c#代码如下: 
private void cmbRecordDirect_Click(object sender, EventArgs e)
    {
        SaveFileDialog saveFileDialog = new SaveFileDialog();
        saveFileDialog.Title = "Select output file:";
        saveFileDialog.Filter = "WAV Files (*.wav)|*.wav";
        saveFileDialog.FileName = outputFilename;
        if (saveFileDialog.ShowDialog() == DialogResult.OK)
        {
            outputFilename = saveFileDialog.FileName;
            mixer.StreamMixToDisk(outputFilename);
            mixer.StartStreamingToDisk();
            cmbRecordDirect.Enabled = false;
            cmbStopDirect.Enabled = true;
            cmbPauseDirect.Enabled = true;
        }
    }

是什么导致这个错误发生?

Naudio StreamMixToDisk error

我没有在form_load中调用SetupAudio()来启动混音器。

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