如何在 c# WPF 中录制 WAV？

Question

我可以让这段代码在控制台应用程序中工作。 但我希望它能够在 c# Visual Studio 2010 中的 Windows 窗体应用程序上工作。这是我的代码：

public partial class MainWindow : Window
{
[DllImport("winmm.dll", EntryPoint = "mciSendStringA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
private static extern int mciSendString(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback);

...

private void buttonRecordWAV_click(object sender, RoutedEventArgs e)
    {
        mciSendString("open new Type waveaudio Alias recsound", "", 0, 0);
        mciSendString("record recsound", "", 0, 0);
        Console.WriteLine("recording, press Enter to stop and save ...");
        Console.ReadLine();
        if (System.Windows.Forms.MessageBox.Show("recording, press OK to stop recording and save", "Recording...", MessageBoxButtons.OK) == System.Windows.Forms.DialogResult.OK)
            {
                System.Windows.Forms.MessageBox.Show("you entered the if statement");
                mciSendString("save recsound result.wav", "", 0, 0);
                mciSendString("close recsound ", "", 0, 0);
            }

    }

但是，当我执行此操作时，我在 bin/Debug 文件夹中看不到任何“result.wav”文件。 当我在控制台应用程序上运行此代码时，它可以工作，并且我可以在 bin/Debug 文件夹中看到一个“result.wav”，当我播放该文件时，我会听到我录制的内容。 有人知道如何在 C# Forms Application 中进行这项工作吗？ 谢谢。

Answer 1

您的示例代码中混合了各种技术。 在以窗体为前端的应用程序中使用Console.ReadLine时。 您还使用了System.Windows.Forms.MessageBox ，它是一个winforms类，而不是WPF类，在这里您应该使用System.Windows.MessageBox 。

我只是使用您示例中的片段将它们快速组合在一起，它对我有用。 示例如下； 标记：

<Grid>
    <Button x:Name="buttonRecordWav" Click="buttonRecordWav_Click">Start Recording</Button>
</Grid>

并在后面的代码中：

public enum MCIErrors
{
    NO_ERROR = 0,
    MCIERR_BASE = 256,
    MCIERR_INVALID_DEVICE_ID = 257,
    MCIERR_UNRECOGNIZED_KEYWORD = 259,
    MCIERR_UNRECOGNIZED_COMMAND = 261,
    MCIERR_HARDWARE = 262,
    MCIERR_INVALID_DEVICE_NAME = 263,
    MCIERR_OUT_OF_MEMORY = 264,
    MCIERR_DEVICE_OPEN = 265,
    MCIERR_CANNOT_LOAD_DRIVER = 266,
    MCIERR_MISSING_COMMAND_STRING = 267,
    MCIERR_PARAM_OVERFLOW = 268,
    MCIERR_MISSING_STRING_ARGUMENT = 269,
    MCIERR_BAD_INTEGER = 270,
    MCIERR_PARSER_INTERNAL = 271,
    MCIERR_DRIVER_INTERNAL = 272,
    MCIERR_MISSING_PARAMETER = 273,
    MCIERR_UNSUPPORTED_FUNCTION = 274,
    MCIERR_FILE_NOT_FOUND = 275,
    MCIERR_DEVICE_NOT_READY = 276,
    MCIERR_INTERNAL = 277,
    MCIERR_DRIVER = 278,
    MCIERR_CANNOT_USE_ALL = 279,
    MCIERR_MULTIPLE = 280,
    MCIERR_EXTENSION_NOT_FOUND = 281,
    MCIERR_OUTOFRANGE = 282,
    MCIERR_FLAGS_NOT_COMPATIBLE = 283,
    MCIERR_FILE_NOT_SAVED = 286,
    MCIERR_DEVICE_TYPE_REQUIRED = 287,
    MCIERR_DEVICE_LOCKED = 288,
    MCIERR_DUPLICATE_ALIAS = 289,
    MCIERR_BAD_CONSTANT = 290,
    MCIERR_MUST_USE_SHAREABLE = 291,
    MCIERR_MISSING_DEVICE_NAME = 292,
    MCIERR_BAD_TIME_FORMAT = 293,
    MCIERR_NO_CLOSING_QUOTE = 294,
    MCIERR_DUPLICATE_FLAGS = 295,
    MCIERR_INVALID_FILE = 296,
    MCIERR_NULL_PARAMETER_BLOCK = 297,
    MCIERR_UNNAMED_RESOURCE = 298,
    MCIERR_NEW_REQUIRES_ALIAS = 299,
    MCIERR_NOTIFY_ON_AUTO_OPEN = 300,
    MCIERR_NO_ELEMENT_ALLOWED = 301,
    MCIERR_NONAPPLICABLE_FUNCTION = 302,
    MCIERR_ILLEGAL_FOR_AUTO_OPEN = 303,
    MCIERR_FILENAME_REQUIRED = 304,
    MCIERR_EXTRA_CHARACTERS = 305,
    MCIERR_DEVICE_NOT_INSTALLED = 306,
    MCIERR_GET_CD = 307,
    MCIERR_SET_CD = 308,
    MCIERR_SET_DRIVE = 309,
    MCIERR_DEVICE_LENGTH = 310,
    MCIERR_DEVICE_ORD_LENGTH = 311,
    MCIERR_NO_INTEGER = 312,
    MCIERR_WAVE_OUTPUTSINUSE = 320,
    MCIERR_WAVE_SETOUTPUTINUSE = 321,
    MCIERR_WAVE_INPUTSINUSE = 322,
    MCIERR_WAVE_SETINPUTINUSE = 323,
    MCIERR_WAVE_OUTPUTUNSPECIFIED = 324,
    MCIERR_WAVE_INPUTUNSPECIFIED = 325,
    MCIERR_WAVE_OUTPUTSUNSUITABLE = 326,
    MCIERR_WAVE_SETOUTPUTUNSUITABLE = 327,
    MCIERR_WAVE_INPUTSUNSUITABLE = 328,
    MCIERR_WAVE_SETINPUTUNSUITABLE = 329,
    MCIERR_SEQ_DIV_INCOMPATIBLE = 336,
    MCIERR_SEQ_PORT_INUSE = 337,
    MCIERR_SEQ_PORT_NONEXISTENT = 338,
    MCIERR_SEQ_PORT_MAPNODEVICE = 339,
    MCIERR_SEQ_PORT_MISCERROR = 340,
    MCIERR_SEQ_TIMER = 341,
    MCIERR_SEQ_PORTUNSPECIFIED = 342,
    MCIERR_SEQ_NOMIDIPRESENT = 343,
    MCIERR_NO_WINDOW = 346,
    MCIERR_CREATEWINDOW = 347,
    MCIERR_FILE_READ = 348,
    MCIERR_FILE_WRITE = 349,
    MCIERR_CUSTOM_DRIVER_BASE = 512
};

[DllImport("winmm.dll", EntryPoint = "mciSendStringA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
private static extern int mciSendString(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback);

private bool _recording = false;

private void buttonRecordWav_Click(object sender, RoutedEventArgs e)
{            
    MCIErrors result;
    if (!_recording)
    {
        result = (MCIErrors)mciSendString("open new Type waveaudio Alias recsound", "", 0, 0);
        if (result != MCIErrors.NO_ERROR)
        {
            MessageBox.Show("Error code: " + result.ToString());
            return;
        }
        result = (MCIErrors)mciSendString("record recsound", "", 0, 0);
        if (result != MCIErrors.NO_ERROR)
        {
            MessageBox.Show("Error code: " + result.ToString());
            return;
        }
        buttonRecordWav.Content = "Stop Recording";
        _recording = true;
    }
    else
    {
        result = (MCIErrors)mciSendString("save recsound result.wav", "", 0, 0);
        if (result != MCIErrors.NO_ERROR)
        {
             MessageBox.Show("Error code: " + result.ToString());
             return;
        }
        result = (MCIErrors)mciSendString("close recsound ", "", 0, 0);
        if (result != MCIErrors.NO_ERROR)
        {
            MessageBox.Show("Error code: " + result.ToString());
            return;
        }
        buttonRecordWav.Content = "Start Recording";
        _recording = false;
    }                            
}

如果运行该文件，则会按预期方式创建wav文件。 有关此处的mciSendString方法的文档：

mciSendString函数

Answer 2

无法评论接受的解决方案（无代表），但 ppl 对接受的解决方案的问题是由于文件路径中的空格。 要解决，只需将完整路径传递给 mciSendString 并将其用引号括起来，例如：

string fullPath = @"c:\path with spaces\result.wav";
result = (MCIErrors)mciSendString("save recsound \"" + fullPath + "\"", "", 0, 0);