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BOOL Main_OnInitDialog(HWND hwnd, HWND hwndFocus, LPARAM lParam){    //当会话框初始化的时候被调用	HWND hwndCombo1 = GetDlgItem(hwnd,IDC_COMBOOP);	/*	怎样使字符串加入的顺序不变?	ComboBox_AddString(hwndCombo1,TEXT("+"));	ComboBox_AddString(hwndCombo1,TEXT("-"));	ComboBox_AddString(hwndCombo1,TEXT("*"));	ComboBox_AddString(hwndCombo1,TEXT("/"));	*/	ComboBox_InsertString(hwndCombo1,-1,TEXT("+"));	ComboBox_InsertString(hwndCombo1,-1,TEXT("-"));	ComboBox_InsertString(hwndCombo1,-1,TEXT("*"));	ComboBox_InsertString(hwndCombo1,-1,TEXT("/"));	return TRUE;}

void Main_OnCommand(HWND hwnd, int id, HWND hwndCtl, UINT codeNotify){    switch(id)    {        case IDC_OK:		{			//HWND hwndCombo1 = GetDlgItem(hwnd,IDC_COMBO1);			/*确定目前选项的索引			int curSel = ComboBox_GetCurSel(hwndCombo1);			if(0==curSel)			{				MessageBox(hwnd,TEXT("你选择的是-号"),TEXT("消息"),MB_OK);			}			*/			/*删除其中的一个选项			ComboBox_DeleteString(hwndCombo1,2);			选定某一项			ComboBox_SetCurSel(hwndCombo1,2);			*/			/*得到某项的值			TCHAR str[256];			ComboBox_GetLBText(hwndCombo1,1,str);			MessageBox(hwnd,str, TEXT("消息"),MB_OK);			*/			TCHAR str1[256];			TCHAR str2[256];			GetDlgItemText(hwnd,IDC_EDIT1,str1,sizeof(str1));			GetDlgItemText(hwnd,IDC_EDIT2,str2,sizeof(str2));			int i1 = atoi(str1);			int i2 = atoi(str2);			int i3 = 0;			HWND hwndComboOp = GetDlgItem(hwnd,IDC_COMBOOP);			int curIndex = ComboBox_GetCurSel(hwndComboOp);			switch(curIndex)			{				case 0:					{						i3 = i1+i2;					}					break;				case 1:					{						i3 = i1-i2;					}					break;				case 2:					{						i3 = i1*i2;					}					break;				case 3:					{						i3 = i1/i2;					}					break;			}			TCHAR str3[256];			itoa(i3,str3,10);			SetDlgItemText(hwnd,IDC_EDIT3,str3);		}        break;        default:		break;    }}

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