方法一：

1 //方法一
2 void CMFCApplication2Dlg::OnBnClickedButton1()
3 {
4 int num1, num2, num3;
5 TCHAR ch1[12], ch2[12], ch3[12];
6 //获取文本值
7 GetDlgItem(IDC_EDIT1)->GetWindowText(ch1,12);
8 GetDlgItem(IDC_EDIT2)->GetWindowText(ch2,12);
9 //字符串转为数字
10 num1 = _ttoi(ch1);
11 num2 = _ttoi(ch2);
12 num3 = num1 + num2;
13
14 _itot(num3, ch3, 10);//数字转化为字符串(10进制)
15 GetDlgItem(IDC_EDIT3)->SetWindowTextW(ch3);
16 }

方法二：

1 //方法二
2 void CMFCApplication2Dlg::OnBnClickedButton1()
3 {
4 int num1, num2, num3;
5 TCHAR ch1[12], ch2[12], ch3[12];
6 //获取文本值
7 GetDlgItemText(IDC_EDIT1, ch1, 12);
8 GetDlgItemText(IDC_EDIT2, ch2, 12);
9 //字符串转为数字
10 num1 = _ttoi(ch1);
11 num2 = _ttoi(ch2);
12 num3 = num1 + num2;
13
14 _itot(num3, ch3, 10);//数字转化为字符串(10进制)
15 SetDlgItemText(IDC_EDIT3, ch3);
16 }

方法三：

1 //方法三
2 void CMFCApplication2Dlg::OnBnClickedButton1()
3 {
4 int num1, num2, num3;
5 //获取文本值
6 num1 = GetDlgItemInt(IDC_EDIT1);
7 num2 = GetDlgItemInt(IDC_EDIT2);
8 num3 = num1 + num2;
9
10 SetDlgItemInt(IDC_EDIT3,num3);
11 }

方法四：

1 //方法四 控件和整型变量相关联
2 void CMFCApplication2Dlg::OnBnClickedButton1()
3 {
4 //同步控件到变量
5 UpdateData(TRUE);
6 m_num3 = m_num2 + m_num1;
7 //同步变量到控件
8 UpdateData(FALSE);
9 }

方法五：

1 //方法五 控件和控件变量相关联
2 void CMFCApplication2Dlg::OnBnClickedButton1()
3 {
4 int num1, num2, num3;
5 TCHAR ch1[12], ch2[12], ch3[12];
6 //获取值
7 m_edit1.GetWindowText(ch1,12);
8 m_edit2.GetWindowText(ch2,12);
9 //字符串转为数字
10 num1 = _ttoi(ch1);
11 num2 = _ttoi(ch2);
12 num3 = num1 + num2;
13 _itot(num3, ch3, 10);//数字转化为字符串(10进制)
14
15 m_edit3.SetWindowText(ch3);
16 }

方法六：

1 //方法六 Windows API SendMessage
2 void CMFCApplication2Dlg::OnBnClickedButton1()
3 {
4 int num1, num2, num3;
5 TCHAR ch1[12], ch2[12], ch3[12];
6
7 ::SendMessage(GetDlgItem(IDC_EDIT1)->m_hWnd,WM_GETTEXT,12,(LPARAM)ch1);
8 ::SendMessage(GetDlgItem(IDC_EDIT2)->m_hWnd,WM_GETTEXT,12,(LPARAM)ch2);
9
10 num1 = _ttoi(ch1);
11 num2 = _ttoi(ch2);
12 num3 = num1 + num2;
13 _itot(num3, ch3, 10);//数字转化为字符串(10进制)
14
15 ::SendMessage(GetDlgItem(IDC_EDIT3)->m_hWnd,WM_SETTEXT,0,(LPARAM)ch3);
16 }

方法七：

1 //方法七 Windows API SendDlgItemMessage
2 void CMFCApplication2Dlg::OnBnClickedButton1()
3 {
4 int num1, num2, num3;
5 TCHAR ch1[12], ch2[12], ch3[12];
6
7 SendDlgItemMessage(IDC_EDIT1, WM_GETTEXT, 12, (LPARAM)ch1);
8 SendDlgItemMessage(IDC_EDIT2, WM_GETTEXT, 12, (LPARAM)ch2);
9
10 num1 = _ttoi(ch1);
11 num2 = _ttoi(ch2);
12 num3 = num1 + num2;
13 _itot(num3, ch3, 10);//数字转化为字符串(10进制)
14
15 SendDlgItemMessage(IDC_EDIT3, WM_SETTEXT, 0, (LPARAM)ch3);
16 }