在dlg类头文件中声明CPoint Old;
在BEGIN_MESSAGE_MAP()和END_MESSAGE_MAP()声明一个映射：ON_WM_SIZE()
这样以后就可以在M_SIZE事件的时候调用这个函数了。
然后定义：
void CmyDlg::OnSize(UINT nType, int cx, int cy)
{
CDialog::OnSize(nType, cx, cy);
if(nType==SIZE_RESTORED||nType==SIZE_MAXIMIZED)//窗体大小发生变动。处理函数resize
{
float fsp[2];
POINT Newp; //获取现在对话框的大小
CRect recta;
GetClientRect(&recta); //取客户区大小
Newp.x=recta.right-recta.left;
Newp.y=recta.bottom-recta.top;
fsp[0]=(float)Newp.x/Old.x;
fsp[1]=(float)Newp.y/Old.y;
CRect Rect;
int woc;
CPoint OldTLPoint,TLPoint; //左上角
CPoint OldBRPoint,BRPoint; //右下角
HWND hwndChild=::GetWindow(m_hWnd,GW_CHILD); //列出所有控件
while(hwndChild)
{
woc=::GetDlgCtrlID(hwndChild);//取得ID
GetDlgItem(woc)->GetWindowRect(Rect);
ScreenToClient(Rect);
OldTLPoint = Rect.TopLeft();
TLPoint.x = long(OldTLPoint.x*fsp[0]);
TLPoint.y = long(OldTLPoint.y*fsp[1]);
OldBRPoint = Rect.BottomRight();
BRPoint.x = long(OldBRPoint.x *fsp[0]);
BRPoint.y = long(OldBRPoint.y *fsp[1]); //高度不可读的控件（如:combBox),不要改变此值.
Rect.SetRect(TLPoint,BRPoint);
GetDlgItem(woc)->MoveWindow(Rect,TRUE);
hwndChild=::GetWindow(hwndChild, GW_HWNDNEXT);
}
Old=Newp;
}
}
OK！