Windows系统自带选择文件的对话重写和居中处理

class CMyFileDialog: public CFileDialogImpl<CMyFileDialog>
{
public:
    CMyFileDialog(BOOL bOpenFileDialog, // TRUE for FileOpen, FALSE for FileSaveAs
        LPCTSTR lpszDefExt = NULL,
        LPCTSTR lpszFileName = NULL,
        DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
        LPCTSTR lpszFilter = NULL,
        HWND hWndParent = NULL)
        : CFileDialogImpl<CMyFileDialog>(bOpenFileDialog, lpszDefExt, lpszFileName, dwFlags, lpszFilter, hWndParent){ }

    // Maps
    BEGIN_MSG_MAP(CMyFileDialog)
        CHAIN_MSG_MAP(CFileDialogImpl<CMyFileDialog>)
    END_MSG_MAP()



    //重载此函数；实现居中
    void OnInitDone ( LPOFNOTIFY lpon )
    {
        GetFileDialogWindow().CenterWindow(lpon->lpOFN->hwndOwner);
    }

};        

重写FileDialog,重载OnInitDone，实现居中，引用代码如下：

void xxx::SelectUpgradeFile()
{
    char szFilters[] =  _T("升级文件 (*.ram)\0*.ram\0全部文件(*.*)\0*.*\0\0");
    CMyFileDialog fileDlg(TRUE,NULL, NULL,OFN_FILEMUSTEXIST|OFN_HIDEREADONLY,szFilters );//szFilters

    char strBuffer[MAX_PATH] = {0};
    fileDlg.m_ofn.lpstrFile = strBuffer;
    fileDlg.m_ofn.nMaxFile = MAX_PATH;
    if (fileDlg.DoModal() != IDOK)
    {
        ImmsMessageBox(m_PaintManager.GetPaintWindow(),_T("升级设备失败！"),_T("提示"),MB_OK);        
        return ;
    }
    m_strEquipmentUpgradeFileName = fileDlg.m_ofn.lpstrFile;
    if (m_strEquipmentUpgradeFileName.Right(4).CompareNoCase(".ram")!=0)
    {
        ImmsMessageBox(m_PaintManager.GetPaintWindow(),_T("选择的文件不是编解码器升级文件！"),_T("提示"),MB_OK|MB_ICONERROR);
        return ;
    }

    CEditUI *pFileName = static_cast<CEditUI *>(m_PaintManager.FindControl(ctrl_device_data_manager_decoder_equi_upgrade_select_file));
    if(!pFileName)
        return;
    pFileName->SetText(m_strEquipmentUpgradeFileName);

}