MFC跑马灯的效果(持续更新)

来源：互联网发布：自己的淘宝店铺怎么刷编辑：程序博客网时间：2024/06/06 01:12

dlg头文件中变量定义：

CString m_string;

RECT m_rect;

RECT rect_static;

SIZE size;

对话框初始化：

// TODO: Add extra initialization here

m_string = "ABCDEFGHIJK MFC 中在一个对话框中实现跑马灯";

SetTimer(1, 200, NULL); // 这里添加一个Timer

HWND hwnd = GetDlgItem(IDC_STATIC)->GetSafeHwnd();

HDC hdc = ::GetDC(hwnd);

::GetTextExtentPoint32(hdc, m_string, m_string.GetLength(), &size);

::GetClientRect(hwnd, &rect_static);

m_rect.left = rect_static.right;

m_rect.right = m_rect.left + size.cx;

m_rect.top = rect_static.top + (rect_static.bottom - rect_static.top - size.cy) / 2;

m_rect.bottom = m_rect.top + size.cy;

::ReleaseDC(hwnd, hdc);

TIMER响应函数：

// TODO: Add your message handler code here and/or call default

HWND hwnd = GetDlgItem(IDC_STATIC)->GetSafeHwnd();

HDC hdc = ::GetDC(hwnd);

HDC hmdc = ::CreateCompatibleDC(hdc);

HBITMAP hbitmap = ::CreateCompatibleBitmap(hdc, rect_static.right - rect_static.left, rect_static.bottom - rect_static.top);

HBITMAP holdbitmap = (HBITMAP)::SelectObject(hmdc, hbitmap);

DrawText(hmdc, m_string, m_string.GetLength(), &m_rect, DT_CENTER);

::BitBlt(hdc, 0, 0, rect_static.right-rect_static.left, rect_static.bottom-rect_static.top,

hmdc, 0, 0, SRCCOPY);

::SelectObject(hmdc, holdbitmap);

::DeleteObject(hbitmap);

::DeleteDC(hmdc);

::ReleaseDC(hwnd, hdc);

if (m_rect.right < rect_static.left)

{

m_rect.left = rect_static.right;

m_rect.right = m_rect.left + size.cx;

}

else

{

m_rect.left -= 10;

m_rect.right -= 10;

}

CDialog::OnTimer(nIDEvent);

追问

朋友，谢谢你，我运行了，可以！但是我想知道为什么，你能把你定时器的那段代码给我详细注释下吗？ 谢谢你了！ 背景的颜色和文字颜色可以自己设置吗？ 兄弟?

追答

// TODO: Add your message handler code here and/or call defaultHWND hwnd = GetDlgItem(IDC_STATIC)->GetSafeHwnd(); //获取静态文本显示控件句柄HDC hdc = ::GetDC(hwnd); //得到句柄的设备DCHDC hmdc = ::CreateCompatibleDC(hdc); //创建一个内存DC，和上面的设备DC兼容HBITMAP hbitmap = ::CreateCompatibleBitmap(hdc, rect_static.right - rect_static.left, rect_static.bottom - rect_static.top); //创建一个位图用来在内存先绘制HBITMAP holdbitmap = (HBITMAP)::SelectObject(hmdc, hbitmap); //将位图选入内存DCDrawText(hmdc, m_string, m_string.GetLength(), &m_rect, DT_CENTER); //绘制跑马灯文字::BitBlt(hdc, 0, 0, rect_static.right-rect_static.left, rect_static.bottom-rect_static.top, hmdc, 0, 0, SRCCOPY); //从内存复制到静态文本控件显示::SelectObject(hmdc, holdbitmap); //恢复旧环境::DeleteObject(hbitmap); //释放内存资源::DeleteDC(hmdc);::ReleaseDC(hwnd, hdc);if (m_rect.right < rect_static.left) //如果文字从左边消失了，恢复到最右边{m_rect.left = rect_static.right;m_rect.right = m_rect.left + size.cx;}else //否则左移10像素{m_rect.left -= 10;m_rect.right -= 10;}初始化对话框的时候，会得到文字绘制的矩形大小，具体你参考代码这样用DrawText绘制的文字和背景是可以随便设置的，甚至可以透明背景……不过这些稍微麻烦点有几个函数你查一下：SetTextColor SetBkColor 之类的http://bbs.csdn.net/topics/240089273

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