C# 重绘问题

[yang_629]

遇到一个恶心的问题。我重绘WinForm 窗口的标题栏，代码是从网上下载下来的，下面的就是的。

 [StructLayout(LayoutKind.Sequential)]
        public class TRACKMOUSEEVENT
        {
            public int cbSize;
            public int dwFlags;
            public IntPtr hwndTrack;
            public int dwHoverTime;
            public TRACKMOUSEEVENT()
            {
                this.cbSize = Marshal.SizeOf(typeof(TRACKMOUSEEVENT));
                this.dwHoverTime = 400;
            }
        }


        [DllImport("user32.dll")]
        private static extern IntPtr GetWindowDC(IntPtr hWnd);
        [DllImport("user32.dll")]
        private static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

        [DllImport("comctl32.dll", ExactSpelling = true)]
        private static extern bool _TrackMouseEvent(TRACKMOUSEEVENT tme);


        private const int WM_NCPAINT = 0x0085;
        private const int WM_NCACTIVATE = 0x0086;

        private const int WM_NCLBUTTONDOWN = 0x00A1;
        private const int WM_NCMOUSEMOVE = 0x00A0;
        private const int WM_NCMOUSELEVEL = 0x02A2;
        private const int WM_NCMOUSEHOVER = 0x02A0;
        private const int TME_NONCLIENT = 0x00000010;

        private bool TrackMouseEvent(TRACKMOUSEEVENT lpEventTrack)
        {
            if (lpEventTrack.dwFlags == TME_NONCLIENT)
            {
                /*画出标题栏关闭按钮*/
                IntPtr hDC4 = GetWindowDC(lpEventTrack.hwndTrack);
                //把DC转换为.NET的Graphics就可以很方便地使用Framework提供的绘图功能了
                Graphics gs4 = Graphics.FromHdc(hDC4);
                Image img4 = Image.FromFile("close_norm.png");
                //显示背景图片
                gs4.DrawImage(img4, 50, 5);
                // MessageBox.Show("fengzanfeng");
                return true;
            }
            return true;
        }

可是为什么运行的时候看到不效果啊，但是如果我把这个窗口当作MDI子窗口或者我远程桌面浏览的时候就能看到效果了。就是直接运行看不到。我纳闷了。不知道有没有人遇到过这种问题啊，麻烦告诉一下怎么解决可以吗？谢了。

[bdmh]

参考http://www.cnblogs.com/hanyonglu/archive/2011/04/12/2014228.html

[yang_629]

上面的代码，我好像少了一部分，如下

     protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);
            //           Rectangle vRectangle = new Rectangle((Width - 75) / 2, 3, 75, 25);
            Rectangle vRectangle = new Rectangle(0, 0, 800, 30);
            Rectangle vRectangleCloseBtn = new Rectangle(50, 5, 64, 19);
            switch (m.Msg)
            {
                case WM_NCPAINT:
                case WM_NCACTIVATE:
                    IntPtr vHandle = GetWindowDC(m.HWnd);
                    Graphics vGraphics = Graphics.FromHdc(vHandle);
                    vGraphics.FillRectangle(new LinearGradientBrush(vRectangle, Color.Pink, Color.Purple, LinearGradientMode.BackwardDiagonal), vRectangle);

                    StringFormat vStringFormat = new StringFormat();
                    vStringFormat.Alignment = StringAlignment.Center;
                    vStringFormat.LineAlignment = StringAlignment.Center;
                    vGraphics.DrawString("About", Font, Brushes.BlanchedAlmond, vRectangle, vStringFormat);

                    vGraphics.Dispose();
                    ReleaseDC(m.HWnd, vHandle);

                    /*画出标题栏ICON*/
                    Size si = new Size(SystemInformation.CaptionButtonSize.Width, SystemInformation.CaptionButtonSize.Height);
                    IntPtr hDC = GetWindowDC(m.HWnd);
                    //把DC转换为.NET的Graphics就可以很方便地使用Framework提供的绘图功能了
                    Graphics gs = Graphics.FromHdc(hDC);
                    Image img = Image.FromFile("abc.png");
                    //显示背景图片
                    gs.DrawImage(img, 5, 5);

                    /*画出标题栏关闭按钮*/
                    IntPtr hDC1 = GetWindowDC(m.HWnd);
                    //把DC转换为.NET的Graphics就可以很方便地使用Framework提供的绘图功能了
                    Graphics gs1 = Graphics.FromHdc(hDC);
                    Image img1 = Image.FromFile("close_norm.png");
                    //显示背景图片
                    gs.DrawImage(img1, 50, 5);


                    break;
                //case WM_NCLBUTTONDOWN:
                //    Point vPoint = new Point((int)m.LParam);
                //    vPoint.Offset(-Left, -Top);
                //    if (vRectangle.Contains(vPoint))
                //        MessageBox.Show(vPoint.ToString());
                //    break;
                case WM_NCMOUSEMOVE:
                    Point vPoint1 = new Point((int)m.LParam);
                    vPoint1.Offset(-Left, -Top);
                    if (vRectangleCloseBtn.Contains(vPoint1))
                    {
                        IntPtr hDC2 = GetWindowDC(m.HWnd);
                        //把DC转换为.NET的Graphics就可以很方便地使用Framework提供的绘图功能了
                        Graphics gs2 = Graphics.FromHdc(hDC2);
                        Image img2 = Image.FromFile("close_over.png");
                        //显示背景图片
                        gs2.DrawImage(img2, 50, 5);

                        TRACKMOUSEEVENT event1 = new TRACKMOUSEEVENT();
                        event1.dwFlags = TME_NONCLIENT;
                        event1.hwndTrack = (IntPtr)this.Handle;
                        event1.dwHoverTime = 400;
                        event1.cbSize = 100;
                        TrackMouseEvent(event1);


                    }
                    break;

                case WM_NCMOUSELEVEL:
                    Point vPoint2 = new Point((int)m.LParam);
                    vPoint2.Offset(-Left, -Top);
                    if (vRectangleCloseBtn.Contains(vPoint2))
                    {
                        IntPtr hDC3 = GetWindowDC(m.HWnd);
                        //把DC转换为.NET的Graphics就可以很方便地使用Framework提供的绘图功能了
                        Graphics gs3 = Graphics.FromHdc(hDC3);
                        Image img3 = Image.FromFile("close_norm.png");
                        //显示背景图片
                        gs3.DrawImage(img3, 50, 5);
                    }
                    break;


            }
        }

[yang_629]

[Quote=引用 1 楼 的回复:]
参考http://www.cnblogs.com/hanyonglu/archive/2011/04/12/2014228.html
[/Quote]

我把这个人写的代码全拷过来也不行。。。郁闷中。。。。

[jianghupt]

public class TRACKMOUSEEVENT
{
public int cbSize;
public int dwFlags;
public IntPtr hwndTrack;
public int dwHoverTime;
public TRACKMOUSEEVENT()
{
this.cbSize = Marshal.SizeOf(typeof(TRACKMOUSEEVENT));
this.dwHoverTime = 400;
}
}

---------------------------
结构体添加 this.dwFlags=TME_NONCLIENT 一句即可看到效果

[Trent1985]

呵呵,顶楼上!!!

[liangchengfck1]

luguo

[yang_629]

[Quote=引用 4 楼 的回复:]
public class TRACKMOUSEEVENT
{
public int cbSize;
public int dwFlags;
public IntPtr hwndTrack;
public int dwHoverTime;
public TRACKMOUSEEVENT()
{
this.cbSize = Marshal.SizeOf(t……
[/Quote]

不行啊。。。。哎。。。

[Pigeon汪]

Control.Refresh();