midobj.cpp

经典飞机游戏的源代码 dx实现

#include"midobj.h"

DWORD CMidi::Play(HWND hwnd,char* MidiFile)

{
    // 开启Midi的硬体装置，我们使用一般内定值
    mciOpenParms.lpstrDeviceType = "sequencer";
    //这个叁数就是要播放的MIDI档案名称
    mciOpenParms.lpstrElementName = MidiFile;
    // 使用Message的方式来播放MIDI而不是STRING的方式
    if (dwReturn = mciSendCommand(NULL, MCI_OPEN,
    MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,
    (DWORD)(LPVOID) &mciOpenParms))return (dwReturn);

    // The device opened successfully; get the device ID.
    wDeviceID = mciOpenParms.wDeviceID;
    // Check if the output port is the MIDI mapper.
    mciStatusParms.dwItem = MCI_SEQ_STATUS_PORT;
    if (dwReturn = mciSendCommand(wDeviceID, MCI_STATUS, 
        MCI_STATUS_ITEM, (DWORD)(LPVOID) &mciStatusParms))
        {
            mciSendCommand(wDeviceID, MCI_CLOSE, 0, NULL);
            return (dwReturn);
        }
        // 为了达成重复播放的目的，必须让我们的程式能够接收到
        // MM_MCINOTIFY的讯息，这个函示呼叫的方式，就是传递
        // WM_PLAY讯息给装置，叫他开始播放。
        mciPlayParms.dwCallback = (DWORD) hwnd;
        if (dwReturn = mciSendCommand(wDeviceID, MCI_PLAY, MCI_NOTIFY, 
        (DWORD)(LPVOID) &mciPlayParms))
        {
            mciSendCommand(wDeviceID, MCI_CLOSE, 0, NULL);
            return (dwReturn);
        }
    return (0L);
};


void CMidi::Replay()
{
        mciSendCommand(wDeviceID, MCI_SEEK,MCI_SEEK_TO_START, NULL);
        mciSendCommand(wDeviceID, MCI_PLAY, MCI_NOTIFY, (DWORD)(LPVOID) &mciPlayParms);
}


void CMidi::Stop()
{
    mciSendCommand(wDeviceID, MCI_CLOSE, 0, NULL);
}


DWORD CMidi::ChangePlay(char* MidiFile)

{
    mciOpenParms.lpstrElementName = MidiFile;

    if (dwReturn = mciSendCommand(NULL, MCI_OPEN,
    MCI_OPEN_TYPE | MCI_OPEN_ELEMENT,
    (DWORD)(LPVOID) &mciOpenParms))return (dwReturn);
    return (0L);
};