在Windows 7中的Titlebar中绘制图形

问题描述

我在Windows 7的标题栏和边框中绘图有问题。下面的代码在XP中工作正常，但在Windows 7中失败。有趣的是，如果我将此代码放入表单并从其他表单继承，我可以在设计时看到图形绘图。但是当我运行应用程序并显示表单时，图形就会消失。有谁知道我可以做些什么来解决这个问题，以便它可以在Windows 7中运行。

使用System; 
使用System.Collections.Generic;使用System.ComponentModel 
; 
使用System.Data;使用System.Drawing 
; 
使用System.Linq; 
使用System.Text; 
使用System.Windows.Forms; 
使用System.Runtime.InteropServices; 
 
命名空间WindowsFormsApplication1 
 {
公共部分类Form1：表格
 {
 public Form1（）{
 InitializeComponent（）; 
} 
 
 [DllImport（user32.dll）] 
 static extern int ReleaseDC（IntPtr hWnd，IntPtr hDC）; 
 
 [DllImport（User32.dll）] 
 
 private static extern IntPtr GetWindowDC（IntPtr hWnd）; 
 
 protected override void WndProc（ref System.Windows.Forms.Message m）{
 
 const int WM_NCPAINT = 0x85; 
 const int WM_NCCREATE = 0x0081; 
 const int WM_NCCALCSIZE = 0x0083; 
 const int WM_NCACTIVATE = 0x0086; 
 
 SolidBrush myBrush; 
 
 base.WndProc（ref m）; 
 if（m.Msg == WM_NCACTIVATE || m.Msg == WM_NCPAINT || m.Msg == WM_NCCREATE || m.Msg == WM_NCCALCSIZE）{
 IntPtr hdc = GetWindowDC（m.HWnd ）; 
 if（（int）hdc！= 0）{
 Graphics g = Graphics.FromHdc（hdc）; 
 
 myBrush = new SolidBrush（SystemColors.ActiveCaption）; 
 Pen myPen = new Pen（myBrush，5）; 
 
 myBrush = new SolidBrush（Color.FromArgb（255,255,0,0））; 
 g.FillRectangle（myBrush，0,0,150，SystemInformation.CaptionHeight）; 
 
 myBrush = new SolidBrush（Color.FromArgb（120,255,0,0））; 
 myPen = new Pen（myBrush，2）; 
 g.DrawRectangle（myPen，0,1,150，SystemInformation.CaptionHeight）; 
 
 myBrush = new SolidBrush（Color.FromArgb（255,255,0,0））; 
 g.FillEllipse（myBrush，150  -  20,0,30，SystemInformation.CaptionHeight）; 
 
 myBrush = new SolidBrush（Color.FromArgb（80,255,0,0））; 
 g.FillEllipse（myBrush，150  -  17,1,30，SystemInformation.CaptionHeight + 1）; 
 
 myBrush = new SolidBrush（Color.FromArgb（150,255,0,0））; 
 myPen = new Pen（myBrush，SystemInformation.FrameBorderSize.Width * 2）; 
 g.DrawRectangle（myPen，0,0，this.Width，this.Height）; 
 
 
 myBrush = new SolidBrush（Color.White）; 
 Font myFont = new Font（new FontFamily（Arial），18，FontStyle.Bold，GraphicsUnit.Pixel）; 
 g.DrawString（Some Text，myFont，myBrush，5,3）; 
 
 g.Flush（）; 
 ReleaseDC（m.HWnd，hdc）; 
} 
} 
 
} 
 
 
} 
} 

解决方案

I am having a problem drawing in the titlebar and border in Windows 7. The code below works fine in XP, but fails in Windows 7. Interestingly, if I place this code into a form and inherit it from another form, I can see the graphics drawing at design time. But when I run the app and display the form the graphics go away. Does anyone know what I can do to fix this so that it works in Windows 7.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
	public partial class Form1 : Form
	{
		public Form1() {
			InitializeComponent();
		}

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

		[DllImport("User32.dll")]

		private static extern IntPtr GetWindowDC(IntPtr hWnd);

		protected override void WndProc(ref System.Windows.Forms.Message m) {
			
			const int WM_NCPAINT = 0x85;
			const int WM_NCCREATE = 0x0081;
			const int WM_NCCALCSIZE = 0x0083;
			const int WM_NCACTIVATE = 0x0086;

			SolidBrush myBrush;

			base.WndProc(ref m);
			if (m.Msg == WM_NCACTIVATE || m.Msg == WM_NCPAINT || m.Msg == WM_NCCREATE || m.Msg == WM_NCCALCSIZE) {
				IntPtr hdc = GetWindowDC(m.HWnd);
				if ((int)hdc != 0) {
					Graphics g = Graphics.FromHdc(hdc);

					myBrush = new SolidBrush(SystemColors.ActiveCaption);
					Pen myPen = new Pen(myBrush, 5);
					
					myBrush = new SolidBrush(Color.FromArgb(255, 255, 0, 0));
					g.FillRectangle(myBrush, 0, 0, 150, SystemInformation.CaptionHeight); 

					myBrush = new SolidBrush(Color.FromArgb(120, 255, 0, 0));
					myPen = new Pen(myBrush, 2);
					g.DrawRectangle(myPen, 0, 1, 150, SystemInformation.CaptionHeight);

					myBrush = new SolidBrush(Color.FromArgb(255, 255, 0, 0));
					g.FillEllipse(myBrush, 150 - 20, 0, 30, SystemInformation.CaptionHeight); 

					myBrush = new SolidBrush(Color.FromArgb(80, 255, 0, 0));
					g.FillEllipse(myBrush, 150 - 17, 1, 30, SystemInformation.CaptionHeight + 1); 

					myBrush = new SolidBrush(Color.FromArgb(150, 255, 0, 0));
					myPen = new Pen(myBrush, SystemInformation.FrameBorderSize.Width * 2);
					g.DrawRectangle(myPen, 0, 0, this.Width, this.Height);


					myBrush = new SolidBrush(Color.White);
					Font myFont = new Font(new FontFamily("Arial"), 18, FontStyle.Bold, GraphicsUnit.Pixel);
					g.DrawString("Some Text", myFont, myBrush, 5, 3);

					g.Flush();
					ReleaseDC(m.HWnd, hdc);
				}
			}

		}


	}
}

解决方案

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