VC中随鼠标移动显示鼠标的位置

本文介绍如何使用MFC在视图中实时显示鼠标坐标,并通过OnMouseMove消息更新坐标值,在OnDraw函数中绘制坐标信息。

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在View类里添加两个私有变量如下:
CPoint m_ptOut; //用来保存鼠标坐标
CString strPosition; //用来保存输出的内容
在其构造函数中初始化m_ptOut为(0,0):
m_ptOut.x = 0;
m_ptOut.y = 0;

OnDraw函数如下:
void CMyView::OnDraw(CDC* pDC)
{
CMyDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
// TODO: add draw code for native data here
strPosition.Format("当前鼠标坐标:%d,%d", m_ptOut.x,m_ptOut.y);
pDC->TextOut(m_ptOut.x,m_ptOut.y,strPosition);
}

消息处理函数OnMouseMove如下:
void CMyView::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
m_ptOut.x = point.x;
m_ptOut.y = point.y;
Invalidate();
CView::OnMouseMove(nFlags, point);
}
Microsoft Visual Studio 2010做的C#实时监控鼠标位置和左键点击时的位置实例,主要代码: public class MouseHook { private Point point; private Point Point { get { return point; } set { if (point != value) { point = value; if (MouseMoveEvent != null) { var e = new MouseEventArgs(MouseButtons.None, 0, point.X, point.Y, 0); MouseMoveEvent(this, e); } } } } private int hHook; private const int WM_LBUTTONDOWN = 0x201; public const int WH_MOUSE_LL = 14; public Win32Api.HookProc hProc; public MouseHook() { this.Point = new Point(); } public int SetHook() { hProc = new Win32Api.HookProc(MouseHookProc); hHook = Win32Api.SetWindowsHookEx(WH_MOUSE_LL, hProc, IntPtr.Zero, 0); return hHook; } public void UnHook() { Win32Api.UnhookWindowsHookEx(hHook); } private int MouseHookProc(int nCode, IntPtr wParam, IntPtr lParam) { Win32Api.MouseHookStruct MyMouseHookStruct = (Win32Api.MouseHookStruct)Marshal.PtrToStructure(lParam, typeof(Win32Api.MouseHookStruct)); if (nCode < 0) { return Win32Api.CallNextHookEx(hHook, nCode, wParam, lParam); } else { if (MouseClickEvent != null) { MouseButtons button = MouseButtons.None; int clickCount = 0; switch ((Int32)wParam) { case WM_LBUTTONDOWN: button = MouseButtons.Left; clickCount = 1; break; } var e = new MouseEventArgs(button, clickCount, point.X, point.Y, 0); MouseClickEvent(this, e); } this.Point = new Point(MyMouseHookStruct.pt.x, MyMouseHookStruct.pt.y); return Win32Api.CallNextHookEx(hHook, nCode, wParam, lParam); } } public delegate void MouseMoveHandler(object sender, MouseEventArgs e); public event MouseMoveHandler MouseMoveEvent; public delegate void MouseClickHandler(object sender, MouseEventArgs e); public event MouseClickHandler MouseClickEvent; }
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