sRecord = "读者编号:" + m_datagrid.GetItem(0) + "\n";
sRecord += "读者姓名:" + m_datagrid.GetItem(1) + "\n";
sRecord += " 图书号:" + m_datagrid.GetItem(2) + "\n";
sRecord += " 图书名:" + m_datagrid.GetItem(3) + "\n";
sRecord += "借出时间:" + m_datagrid.GetItem(4) + "\n";
sRecord += "归还时间:" + m_datagrid.GetItem(5) + "\n";
sRecord += " 备注:" + m_datagrid.GetItem(6) + "\n";
MessageBox(sRecord);
如果第5列的值为空,就弹不出窗口,查出是m_datagrid.GetItem(5)调用有问题,请问怎么判断值为空,m_datagrid.GetItem(5).IsEmpty()也没用,试过了,在线等
sRecord += "读者姓名:" + m_datagrid.GetItem(1) + "\n";
sRecord += " 图书号:" + m_datagrid.GetItem(2) + "\n";
sRecord += " 图书名:" + m_datagrid.GetItem(3) + "\n";
sRecord += "借出时间:" + m_datagrid.GetItem(4) + "\n";
sRecord += "归还时间:" + m_datagrid.GetItem(5) + "\n";
sRecord += " 备注:" + m_datagrid.GetItem(6) + "\n";
MessageBox(sRecord);
如果第5列的值为空,就弹不出窗口,查出是m_datagrid.GetItem(5)调用有问题,请问怎么判断值为空,m_datagrid.GetItem(5).IsEmpty()也没用,试过了,在线等
m_datagrid.GetItem(5) 是对象没有了吧
sRecord += "借出时间:" "无" + "\n";
else
sRecord += "借出时间:" + m_datagrid.GetItem(4) + "\n";
if(m_datagrid.GetItem(5)==NULL || m_datagrid.GetItem(5)=="")
sRecord += "归还时间:" + "无" + "\n";
else
sRecord += "归还时间:" + m_datagrid.GetItem(5) + "\n";
其实其它几条语句也应该这样判断
地方
少个加号:
sRecord += ("借出时间:"+ "无" + "\n");
眼花了,下面的语句也要加上括号,不然可能结果出错,因为是用的是+=这么赋值的,编绎时有个先后问题,加括号是为了保证结果一定正确