通过OnPaint()给 CXXDialog填充不同的颜色。

ON_WM_CTLCOLOR给对话框绘图，部分绘图很不好弄。 比如下面
HBRUSH CShortMsgDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
CRect tempContrlRectUp=m_controArealRect;
CRect tempContrlRectDown=m_controArealRect;

tempContrlRectUp.bottom=BTN_POS_TOP;
m_pDC->FillSolidRect(&tempContrlRectUp,RGB(0xCA, 0xE1, 0xFF));

tempContrlRectDown.top=BTN_POS_TOP+ m_btnCount*BTN_WIDE;
m_pDC->FillSolidRect(&tempContrlRectDown,RGB(0xCA, 0xE1, 0xFF));

if(CTLCOLOR_EDIT==nCtlColor)
{
   //pDC->SetBkMode(TRANSPARENT);
   //pDC->SetBkColor(RGB(234,231,11));
}

hbr= ::CreateSolidBrush(RGB(245,245,245));
return hbr;
}
这个会出现 如不过返回画刷的，m_pDC->FillSolidRect(&tempContrlRectUp,RGB(0xCA, 0xE1, 0xFF)); 填充的部分被其dialog返回的画刷暂时的覆盖
的时候，会出现覆盖的现象。被hbr覆盖。 就算不被hbr覆盖也会被window本身的颜色覆盖。在CSDN看到在OnPaint中填充部dialog颜色
不会出现覆盖。

猜测是返回的画刷OnCtlColor消息先收到，然后才是OnPaint,如果单独
在OnPaint冲填充，也没有返回什么画刷。所以不会被暂时覆盖。下面是在OnPaint中填充对话框不同的颜色。不会发生遮盖。

如果你的工程是对话框, 且要画的地方正是主对话框的话, 直接定位到CXXXDlg的OnPaint函数,如下作处理.
C/C++ codevoid CXXXDlg::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 //***************************目前处理的是这里下的
    {
        CPaintDC dc(this);
        CRect rcClient, rc1,rc2, rc3;
        GetClientRect(rcClient); //rcClient是对话框客户区大小,将这个rcClient分成三个区域,画这三个区域就行了
        rc1 = CRect(rcCLient.left, rcClient.top, rcClient.right, rcClient.top + rcClient.Height()/3 );
        rc2 = CRect(rcClient.left, rc1.bottom, rcClient.right, rc1.bottom + rcClient.Height()/3 );
        rc3 = CRect(rcClient.left, rc2.bottom, rcClient.right, rc2.bottom + rcClient.Height()/2 );
               
        dc.FillSolidRect(rc1, RGB(255, 255, 255));
        dc.FillSolidRect(rc2, RGB(0, 0, 255));
        dc.FillSolidRect(rc3, RGB(0, 0, 0));
       
        CDialog::OnPaint();
    }
}

添加对话框 CDialog1的WM_PAINT消息。
C/C++ codevoid CDialog1::OnPaint()
{
    CPaintDC dc(this); // device context for painting
   
    // TODO: Add your message handler code here
    CRect rcClient, rc1,rc2, rc3;
    GetClientRect(rcClient); //rcClient是对话框客户区大小,将这个rcClient分成三个区域,画这三个区域就行了
    rc1 = CRect(rcClient.left, rcClient.top, rcClient.right, rcClient.top + rcClient.Height()/3 );
    rc2 = CRect(rcClient.left, rc1.bottom, rcClient.right, rc1.bottom + rcClient.Height()/3 );
    rc3 = CRect(rcClient.left, rc2.bottom, rcClient.right, rc2.bottom + rcClient.Height()/2 );
               
    dc.FillSolidRect(rc1, RGB(255, 255, 255));
    dc.FillSolidRect(rc2, RGB(0, 0, 255));
    dc.FillSolidRect(rc3, RGB(0, 0, 0));
}