dll.cpp

 CString szStr(_T("Provider=SQLOLEDB.1;SERVER=192.168.0.121;UID=sa;PWD=12345;DATABASE=jinhe;"));
    CString sKey = _T("z12345");

    typedef CString (PASCAL EXPORT *BuildNcProgram)(const CString&, const CString&,const CString&);
    HINSTANCE hDLL;
    hDLL = LoadLibrary(_T("BuildNcProgram.dll"));
    if (NULL != hDLL)
    {
        BuildNcProgram Building =(BuildNcProgram)GetProcAddress(hDLL, _T("BuildNcProgram"));
        if (NULL != Building )
        {
            CString sss = Building(szStr, sKey, "E:\\");
            MessageBox(sss);
        }
        else
        {
            CString ss = _T("取函数错误！");
        }
        FreeLibrary(hDLL);//卸载MyDll.dll文件；
    }
    else
    {
        _T("加载DLL错误！");
    }