c++ 代码笔记

    
    CMenu menu;
    CMenu sub_menu1;
    CMenu sub_menu2;
    menu.CreateMenu();

    sub_menu1.CreatePopupMenu();
    sub_menu2.CreatePopupMenu();
    
    sub_menu1.AppendMenu(MF_STRING,ID_DIA_NEW,_T("新建"));
    sub_menu1.AppendMenu(MF_STRING,ID_DIA_OPEN,_T("打开"));
    sub_menu1.AppendMenu(MF_SEPARATOR);
    sub_menu1.AppendMenu(MF_STRING,ID_DIA_EXIT,_T("退出"));
    
    sub_menu2.AppendMenu(MF_STRING,ID_DIA_CUT,_T("剪切"));
    sub_menu2.AppendMenu(MF_STRING,ID_DIA_PASTE,_T("粘贴"));

    //把子菜单添加到主菜单上去
    menu.AppendMenu(MF_POPUP,(UINT)sub_menu1.m_hMenu,_T("&基本操作"));
    menu.AppendMenu(MF_POPUP,(UINT)sub_menu2.m_hMenu,_T("&编辑"));

    SetMenu(&menu);
    menu.Detach();

在对话框上手动创建菜单代码

    // TODO: 在此添加控件通知处理程序代码
    UINT uiRead;
    CFile file;
    char buffer[1024];
    CString str;
    file.Open(L"text.txt",CFile::modeRead|CFile::modeCreate|CFile::modeNoTruncate);
    do 
    {    
        memset(buffer,0,1024);
        uiRead = file.Read(buffer,1024);
        str += CString(buffer);
    } while (uiRead < 0);

    file.Close();
    GetDlgItem(IDC_EDIT1)->SetWindowText(str);

读取文件代码

// TODO: 在此添加控件通知处理程序代码
    CoInitialize(NULL);    //初始化COM组件

    _ConnectionPtr pConn(__uuidof(Connection));    //实例化一个connection对象pConn
    _RecordsetPtr pRst(__uuidof(Recordset));    //实例化一个Recordset对象pRst
    _CommandPtr pCmd(__uuidof(Command));    //实例化一个Command对象pCmd

    //通过pConn对象连接字符串，连接到ACCESS数据库，这里ACCESS数据库在C根目录下
    pConn->Open("Provider=MIcrosoft.Jet.OLEDB.4.0;Data source=Student.mdb","","",adConnectUnspecified);

    pCmd->put_ActiveConnection(_variant_t((IDispatch*)pConn));
    pCmd->CommandText="SELECT * FROM Students";    //通过pCmd对象访问数据库
    pRst=pCmd->Execute(NULL,NULL,adCmdText);
    try{
        while(!pRst->rsEOF)
        {
            ((CListBox*)GetDlgItem(IDC_LIST1))->AddString((_bstr_t)pRst->GetCollect("StudentName"));
            //把数据库中学号这列的内容放入IDC_LIST1的LIST控件中
            pRst->MoveNext();    //下移一个
        }
    }catch(_com_error e){
        MessageBox(_T("FILEDS"));
    }

    pRst->Close();    //关闭对象
    pConn->Close();
    pCmd.Release();    //释放对象
    pRst.Release();


    pConn.Release();
    CoUninitialize();    //卸载COM组件

链接数据库,头文件要先引入

#import "C:Program FilesCommon FilesSystemadomsadox.dll" 
#import "C:Program FilesCommon FilesSystemadomsado15.dll" no_namespace rename("EOF","rsEOF")//不要命名空间,重命//名EOF为rsEOF