Question

使用vc编程时， Tab Control切换两个子窗口时，只能显示第一个，为什么？

截图

Answer 1

给你一个程序你自己看看吧，不知道对你有帮助没？
BOOL CGraduationDlg::OnInitDialog()
{
CDialog::OnInitDialog();

// Add "About..." menu item to system menu.

// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);

CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}

// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here
m_tab.InsertItem(0,"前束与外倾角的匹配"); //添加参数一选项卡
m_tab.InsertItem(1,"主销内倾角和后倾角的匹配"); //添加参数二选项卡

m_dialog1.Create(IDD_DIALOG1,GetDlgItem(IDC_TABTEST));
m_dialog2.Create(IDD_DIALOG2,GetDlgItem(IDC_TABTEST));

//获得IDC_TABTEST客户区大小
CRect rs;
m_tab.GetClientRect(&rs);
//调整子对话框在父窗口中的位置
rs.top+=20;
rs.bottom-=0;
rs.left+=0;
rs.right-=0;

//设置子对话框尺寸并移动到指定位置
m_dialog1.MoveWindow(&rs);
m_dialog2.MoveWindow(&rs);

//分别设置隐藏和显示
m_dialog1.ShowWindow(true);
m_dialog2.ShowWindow(false);

//设置默认的选项卡
m_tab.SetCurSel(0);

return FALSE; // return TRUE unless you set the focus to a control
}

void CGraduationDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
if ((nID & 0xFFF0) == IDM_ABOUTBOX)
{
CAboutDlg dlgAbout;
dlgAbout.DoModal();
}
else
{
CDialog::OnSysCommand(nID, lParam);
}
}

// If you add a minimize button to your dialog, you will need the code below
// to draw the icon. For MFC applications using the document/view model,
// this is automatically done for you by the framework.

void CGraduationDlg::OnPaint()
{
if (IsIconic())
{
CPaintDC dc(this); // device context for painting

SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

// Center icon in client rectangle
int cxIcon = GetSystemMetrics(SM_CXICON);
int cyIcon = GetSystemMetrics(SM_CYICON);
CRect rect;
GetClientRect(&rect);
int x = (rect.Width() - cxIcon + 1) / 2;
int y = (rect.Height() - cyIcon + 1) / 2;

// Draw the icon
dc.DrawIcon(x, y, m_hIcon);
}
else
{
CDialog::OnPaint();
}
}

// The system calls this to obtain the cursor to display while the user drags
// the minimized window.
HCURSOR CGraduationDlg::OnQueryDragIcon()
{
return (HCURSOR) m_hIcon;
}

void CGraduationDlg::OnSelchangeGraduation(NMHDR* pNMHDR, LRESULT* pResult)
{
// TODO: Add your control notification handler code here
int CurSel = m_tab.GetCurSel();
switch(CurSel)
{
case 0:
m_dialog1.ShowWindow(true);
m_dialog2.ShowWindow(false);
break;

case 1:
m_dialog1.ShowWindow(false);
m_dialog2.ShowWindow(true);

break;

default:
;
}

*pResult = 0;
}

Answer 2

在对话框上放置一个Tab Control的控件，再在对话框上放置所需的控件（本例放置了2个按钮，试图在每个标签中显示一个）。然后利用Class Wizard来为Tab Control控件创建一个控件变量，该变量是CTabCtrl类的，再为其他控件也创建相应的控件类。 在主对话框的初始函数中CProperty1Dlg::OnInitDialog()加入如下代码：
//本例插入两个标签，实际运用中可通过循环插入所需个数的标签，运行后默认第一个标签被选中
m_tab.InsertItem( 0, _T("Tab1") );
m_tab.InsertItem( 1, _T("Tab2") );
//将不是第一个标签的控件隐藏掉，只留下你要的控件
m_button2.ShowWindow( SW_HIDE );
再利用ClassWizard处理Tab Control的 TCN_SELCHANGE 的消息。在消息处理函数中，利用CWnd::ShowWindow来使相应的控件显示和隐藏。
void CProperty1Dlg::OnSelchangeTab1(NMHDR* pNMHDR, LRESULT* pResult)
{
//GetCurSel返回当前被选中的标签的索引号（以0为基础算起）
int sel = m_tab.GetCurSel();

switch(sel)
{
case 0:
m_button1.ShowWindow( SW_SHOW );
m_button2.ShowWindow( SW_HIDE );
break;
case 1:
m_button2.ShowWindow( SW_SHOW );
m_button1.ShowWindow( SW_HIDE );
break;
}

*pResult = 0;
}