播放 Waveform-Audio 檔案

[與此頁面相關聯的功能 MCI是舊版功能。 MediaPlayer已取代它。 MediaPlayer 已針對 Windows 10 和 Windows 11 優化。 Microsoft強烈建議新程式代碼盡可能使用 MediaPlayer，而不是 MCI。 Microsoft建議使用舊版 API 的現有程式代碼，盡可能改寫成使用新的 API。]

下列範例會開啟超聲波音頻裝置，並使用 mciSendCommand 函式，播放由 lpszWAVEFileName 參數指定的超聲波音頻檔案。

// Plays a specified waveform-audio file using MCI_OPEN and MCI_PLAY. 
// Returns when playback begins. Returns 0L on success, otherwise 
// returns an MCI error code.

DWORD playWAVEFile(HWND hWndNotify, LPSTR lpszWAVEFileName)
{
    UINT wDeviceID;
    DWORD dwReturn;
    MCI_OPEN_PARMS mciOpenParms;
    MCI_PLAY_PARMS mciPlayParms;

    // Open the device by specifying the device and filename.
    // MCI will choose a device capable of playing the specified file.

    mciOpenParms.lpstrDeviceType = "waveaudio";
    mciOpenParms.lpstrElementName = lpszWAVEFileName;
    if (dwReturn = mciSendCommand(0, MCI_OPEN,
       MCI_OPEN_TYPE | MCI_OPEN_ELEMENT, 
       (DWORD)(LPVOID) &mciOpenParms))
    {
        // Failed to open device. Don't close it; just return error.
        return (dwReturn);
    }

    // The device opened successfully; get the device ID.
    wDeviceID = mciOpenParms.wDeviceID;

    // Begin playback. The window procedure function for the parent 
    // window will be notified with an MM_MCINOTIFY message when 
    // playback is complete. At this time, the window procedure closes 
    // the device.

    mciPlayParms.dwCallback = (DWORD) hWndNotify;
    if (dwReturn = mciSendCommand(wDeviceID, MCI_PLAY, MCI_NOTIFY, 
        (DWORD)(LPVOID) &mciPlayParms))
    {
        mciSendCommand(wDeviceID, MCI_CLOSE, 0, NULL);
        return (dwReturn);
    }

    return (0L);
}