WIN32不得不会：视频播放器

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----赵大哥

为何要写这篇博客

纯WIN32API打造，自认为对底层的理解略有帮助，和大家分享成果和知识点。

已经实现功能有：打开、播放、关闭功能。

核心功能讲解：

1.WIN32打开文件对话框

BOOL OpenFileDlg(HWND hWnd, TCHAR* szFileSelect)
{
    OPENFILENAME ofn;
    ZeroMemory(&ofn, sizeof(OPENFILENAME));
    //需要兼容UNICODE处理
    ZeroMemory(szFileSelect, sizeof(TCHAR)*MAX_PATH_LEN);
    ofn.Flags = OFN_EXPLORER;
    ofn.hwndOwner = hWnd;
    ofn.lpstrFile = szFileSelect;
    ofn.lpstrFile[0] = '';
    ofn.lpstrFileTitle = szFileFilter;
    ofn.lStructSize = sizeof(OPENFILENAME);
    ofn.nMaxFile = MAX_PATH_LEN;
    ofn.nMaxFileTitle = MAX_PATH_LEN;
    if(GetOpenFileName(&ofn))
    {
        //与网上给出的方法不同，实践中只要打开OK，文件路径就保存在ofn.lpstrFile参数中
        return TRUE;
    }
    return FALSE;
}

需要注意的是lpstrFile[0]必须设置为''才能弹出对话框。

2.MCI系列API使用

打开视频并预览一下

void OpenVideoFile(HWND hWnd)
{
    TCHAR szFileSelect[MAX_PATH_LEN];
    if(OpenFileDlg(hWnd, szFileSelect))
    {
        MCI_DGV_OPEN_PARMS MciOpenParams;
        ZeroMemory(&MciOpenParams, sizeof(MciOpenParams));
        MciOpenParams.dwCallback = (DWORD)hWnd;
        //指定dwStyle为WS_CHILD和mciSendCommand中的MCI_DGV_OPEN_PARENT | MCI_DGV_OPEN_WS，新打开的视频窗口为主窗口的子窗口
        MciOpenParams.dwStyle = WS_CHILD;
        MciOpenParams.hWndParent = hWnd;
        MciOpenParams.lpstrElementName = szFileSelect;
        mciSendCommand(MciOpenParams.wDeviceID, MCI_OPEN, MCI_OPEN_ELEMENT | MCI_DGV_OPEN_PARENT | MCI_DGV_OPEN_WS, (DWORD)&MciOpenParams);
        g_MciDevId = MciOpenParams.wDeviceID;

        //指定MCI_DGV_STATUS_HWND参数以获取视频子窗口的句柄
        MCI_DGV_STATUS_PARMS MciStatusParams;
        MciStatusParams.dwItem = MCI_DGV_STATUS_HWND;
        mciSendCommand(MciOpenParams.wDeviceID, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)&MciStatusParams);
        hVideo = (HWND)MciStatusParams.dwReturn;
        //根据主窗体的大小调节视频窗口的大小
        GetClientRect(hWnd, &ClientRect);
        MoveWindow(hVideo, 5, 5, ClientRect.right - ClientRect.left - 10, ClientRect.bottom - ClientRect.top - 10, TRUE);

        //播放视频预览
        MCI_DGV_PLAY_PARMS MciPlayParams;
        MciPlayParams.dwCallback = (DWORD)PlayWndProc;
        MciPlayParams.dwFrom = 0;
        MciPlayParams.dwTo = 0;
        mciSendCommand(MciOpenParams.wDeviceID, MCI_PLAY, MCI_FROM, (DWORD)&MciPlayParams);
        mciSendCommand(MciOpenParams.wDeviceID, MCI_PAUSE, MCI_FROM, (DWORD)&MciPlayParams);
        return;
    }
    return ;
}

播放视频

void PlayVideoFile(int iDevID)
{
    MCI_DGV_STATUS_PARMS MciStatusParams;
    MciStatusParams.dwItem = MCI_STATUS_POSITION;
    mciSendCommand(iDevID, MCI_STATUS, MCI_STATUS_ITEM, (DWORD)&MciStatusParams);


    MCI_DGV_PLAY_PARMS MciPlayParms;
    MciPlayParms.dwCallback = NULL;
    MciPlayParms.dwFrom = (DWORD)MciStatusParams.dwReturn;
    MciPlayParms.dwTo = 0;
    mciSendCommand(iDevID, MCI_PLAY, MCI_FROM,(DWORD)&MciPlayParms);
    return;

}

暂停视频

void PauseVideoFile(int iDevID)
{
    MCI_DGV_PAUSE_PARMS MciPauseParams;
    MciPauseParams.dwCallback = NULL;
    mciSendCommand(iDevID, MCI_PAUSE, NULL, (DWORD)&MciPauseParams);
}

3.系统菜单栏和下拉菜单栏的使用。

有横向菜单栏和下拉菜单两种用法，看官当心其中的区别咯

	HMENU hSYSMenu;
        hSYSMenu = CreateMenu();
        HMENU hHELPMenu;
        hHELPMenu = CreatePopupMenu();
        AppendMenu(hHELPMenu, MF_STRING, IDM_SYSMENU_OPERATE, TEXT("操作指引"));
        AppendMenu(hHELPMenu, MF_SEPARATOR, NULL, NULL);
        AppendMenu(hHELPMenu, MF_STRING, IDM_SYSMENU_ABOUT, TEXT("关于"));

        AppendMenu(hSYSMenu, MF_STRING, IDM_SYSMENU_OPEN, TEXT("打开"));
        AppendMenu(hSYSMenu, MF_STRING, IDM_SYSMENU_PLAY, TEXT("播放"));
        AppendMenu(hSYSMenu, MF_STRING, IDM_SYSMENU_STOP, TEXT("暂停"));
        AppendMenu(hSYSMenu, MF_STRING, IDM_SYSMENU_CLOSE, TEXT("关闭"));
        AppendMenu(hSYSMenu, MF_STRING | MF_POPUP, (UINT_PTR)hHELPMenu, TEXT("帮助"));

        SetMenu(hWnd, hSYSMenu);

普通菜单用CreateMenu创建，SetMenu生效；下拉菜单用CreatePopupMenu创建，追加菜单项都是用AppendMenu实现，将下拉菜单追加到普通菜单条目下也是用AppendMenu来实现，属性中要指定MF_POPUP和要插入的菜单句柄。

小结

播放的框架算是完成了，可大可小的一个软件，时间允许的话会再增加一些实用功能。

源码下载：http://download.csdn.net/detail/hd770c/7192051