MFC更改button上的内容为什么失败

Question

void CKDE5988_testDlg::OnPort() 
{
CString port[8]={"COM1","COM2","COM3","COM4","COM5","COM6","COM7","COM8"};
for(int i=1;i<8;i++)
{
SetDlgItemText(IDC_Port,port[i]);
break;
}
}
另外一种用多个按钮 一开始设置为不可见  然后使showwindow（true）也失败

Answer 1

for(int i=0;i<8;i++)
break;     ????????why?           --->Sleep(500);

Answer 2

break；就退出循环了,按楼主的结果，只能显示COM2

Answer 3

我想点一下按纽就变成com2   再点就com3

Answer 4

我想点一下按纽就变成com2 再点就com3

Answer 5

void CKDE5988_testDlg::OnPort()  
{CString port[8]={"COM1","COM2","COM3","COM4","COM5","COM6","COM7","COM8"};static int i=0;
if((++i) == 8) i=0;
SetDlgItemText(IDC_Port,port[i]);}