[.NET] 在桌面画图的范例

简介

示范如何取得桌布的Handle并且利用DC在上面画图

 

范例代码

 

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 DrawDesktop{ public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { IntPtr hdc = GetDCEx(GetDesktopWindow(), IntPtr.Zero, 1027); using (Graphics g = Graphics.FromHdc(hdc)) { g.FillEllipse(Brushes.Red, 0, 0, 400, 400); } } [DllImport("user32.dll")] static extern IntPtr GetDesktopWindow(); [DllImport("user32.dll")] static extern IntPtr GetDCEx(IntPtr hwnd, IntPtr hrgn, uint flags); }}