//第一种方法

int number1, number2, number3;

char char1[10], char2[10], char3[10];

GetDlgITem(IDC_EDIT2)->GetWindowText(char2, 10);

 

number1 = atoi(char1);

number2 = atoi(char2);

number3 = number1 +number2;

 

itoa(number3, char3, 10);

GetDlgItem(IDC_EDIT3)->SetWindowText(cahr3);

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//第二种方法

char char1[10], char2[10], char3[10];

int number1, number2, number3;

 

GetDlgItemText(IDC_EDIT1, char1, 10);

GetDlgITemText(IDC_EDIT2, char2, 10);

 

number1 = atoi(char1);

number2 = atoi(char2);

number3 = number1 + number2;

itoa(number3, char3, 10);

SetDlgItemText(IDC_EDIT3, char3);

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//第三种方法

int number1, number2, number3;

number1 = GetDlgItemInt(IDC_EDIT1);

number2 = GetDlgITemInt(IDC_EDIT2);

number3 = number1 + number2;

 

SetDlgItemInt(IDC_EDIT3, number3);

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//第四种方法

*在ClassWizard中的Member中找到IDC_EDIT1和IDC_EDIT2的Control IDs双击IDC_EDIT1和IDC_EDIT2打开Add MemberVariable

添加MemberVariableName的新名字（m_number1)

CateGory:Value;

Variable Type: Int;

OK!

void CTest_3Dlg::OnButton1()

{

 

DoDateExChange;ＭＳＤＮ说明这个函数程序代码从来是不调用的，而是由我们通过ＣＷｎｄ类的另一个函数来调用的（ＵｐｄａｔｅDａｔａ（））；来实现的。

}

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//第六种方法

int num1, num 2, num3;

char ch1[10], ch2[10], ch3[10];

::SendMessage(GetDlgItem(IDC_EDIT1)->m_Hwnd),  WM_GETTEXT, 10, (LPARAW)ch1);

::SendMessage(m_ctrlEDIT2.m_Hwnd),  WM_GETTEXT, 10, (LPARAW)ch2);

num1 = atoi(ch1);

num2 = atoi(ch2);

num3 = num1  + num2;

m_ctrlEDIT3.SendMessage(WM_SETTETXT,  10, (LPARAW), ch3);

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