VIP会员
购物车
私信
发表新帖
立即签到
关注
回复
支持(
反对(
首页上一页 1 下一页尾页 1 条记录 1/1页
请大家指教
发表在C语言图书答疑
2011-10-27
是否精华
是
否
版块置顶:
是
否
GetPrivateProfileString("DatabaseConfig","Server","",temp1,100,temp+"login.ini");
strserver = (TCHAR *)temp1;
GetPrivateProfileString("DatabaseConfig","Database","",temp1,100,temp+"login.ini");
strdbName = temp1;
GetPrivateProfileString("DatabaseConfig","User","",temp1,100,temp+"login.ini");
strUser = temp1;
GetPrivateProfileString("DatabaseConfig","PWD","",temp1,100,temp+"login.ini");
strPassword = temp1;
strAdoConn.Format("driver={SQL Server};SERVER=%s;UID=%s;PWD=%s;DATABASE=%s",
strserver, strUser, strPassword, strdbName);
m_pCon.CreateInstance(_uuidof(Connection));
m_pCon->ConnectionString = (_bstr_t)strAdoConn;
m_pCon->Open("","","",NULL);
这是我在VISUAL C++项目开发案例这本书中看到的一个代码，我想问一下为什么m_pCon->Open("","","",NULL);
中参数为省略，最后一个为NULL，这句代码是什么意思
strserver = (TCHAR *)temp1;
GetPrivateProfileString("DatabaseConfig","Database","",temp1,100,temp+"login.ini");
strdbName = temp1;
GetPrivateProfileString("DatabaseConfig","User","",temp1,100,temp+"login.ini");
strUser = temp1;
GetPrivateProfileString("DatabaseConfig","PWD","",temp1,100,temp+"login.ini");
strPassword = temp1;
strAdoConn.Format("driver={SQL Server};SERVER=%s;UID=%s;PWD=%s;DATABASE=%s",
strserver, strUser, strPassword, strdbName);
m_pCon.CreateInstance(_uuidof(Connection));
m_pCon->ConnectionString = (_bstr_t)strAdoConn;
m_pCon->Open("","","",NULL);
这是我在VISUAL C++项目开发案例这本书中看到的一个代码，我想问一下为什么m_pCon->Open("","","",NULL);
中参数为省略，最后一个为NULL，这句代码是什么意思
分享到：
