winform壁纸工具：为图片添加当月的日历并设为壁纸 .

这几天用winform做了一个设置壁纸的小工具， 为图片添加当月的日历并设为壁纸，可以手动设置壁纸，也可以定时设置壁纸，最主要的特点是在图片上生成当前月的日历信息。

工具和桌面设置壁纸后的效果如下：

在图片上画日历的类代码Calendar.cs如下：

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.IO;
using System.Drawing.Imaging;

namespace SetWallpaper
{
    public class Calendar
    {
        /// <summary>
        /// 计算星期几: 星期日至星期六的值为0-6
        /// </summary>
        public static int GetWeeksOfDate(int year, int month, int day)
        {
            DateTime dt = new DateTime(year, month, day);
            DayOfWeek d = dt.DayOfWeek;
            return Convert.ToInt32(d);
        }     
        /// <summary>
        /// 获取指定年月的天数
        /// </summary>
        public static int GetDaysOfMonth(int year, int month)
        {
            DateTime dtCur = new DateTime(year, month, 1);
            int days = dtCur.AddMonths(1).AddDays(-1).Day;
            return days;
        }
        /// <summary>
        /// 获取在图片上生成日历的图片
        /// </summary>
        public static Bitmap GetCalendarPic(Image img)
        {
            Bitmap bmp = new Bitmap(img.Width, img.Height, PixelFormat.Format24bppRgb);
            bmp.SetResolution(72, 72);
            using (Graphics g = Graphics.FromImage(bmp))
            {                
                g.DrawImage(img, 0, 0, img.Width, img.Height);                              
              
                DateTime dtNow = DateTime.Now;
                int year = dtNow.Year;
                int month = dtNow.Month;
                int day = dtNow.Day;
                int day1st = Calendar.GetWeeksOfDate(year, month, 1); //第一天星期几
                int days = Calendar.GetDaysOfMonth(year, month); //获取想要输出月份的天数

                int startX = img.Width / 2; //开始的X轴位置
                int startY = img.Height / 4; //开始的Y轴位置
                int posLen = 50; //每次移动的位置长度
                int x = startX + day1st * posLen; //1号的开始X轴位置
                int y = startY + posLen * 2;//1号的开始Y轴位置

                Calendar.DrawStr(g, dtNow.ToString("yyyy年MM月dd日"), startX, startY);
                string[] weeks = { "日", "一", "二", "三", "四", "五", "六" };
                for (int i = 0; i < weeks.Length; i++)
                    Calendar.DrawStr(g, weeks[i], startX + posLen * i, startY + posLen);

                for (int j = 1; j <= days; j++)
                {
                    if (j == day)//如果是今天，设置背景色
                        Calendar.DrawStrToday(g, j.ToString().PadLeft(2, ' '), x, y);
                    else
                        Calendar.DrawStr(g, j.ToString().PadLeft(2, ' '), x, y);
                    //星期六结束到星期日时换行，X轴回到初始位置，Y轴增加
                    if ((day1st + j) % 7 == 0)
                    {
                        x = startX;
                        y = y + posLen;
                    }
                    else
                        x = x + posLen;
                }
                 
               return bmp;
            }
        }
        /// <summary>
        /// 绘制字符串
        /// </summary>
        public static void DrawStr(Graphics g, string s, float x, float y)
        {
            Font font = new Font("宋体", 25, FontStyle.Bold);
            PointF pointF = new PointF(x, y);
            g.DrawString(s, font, new SolidBrush(Color.Yellow), pointF);
        }
        /// <summary>
        /// 绘制有背景颜色的字符串
        /// </summary>
        public static void DrawStrToday(Graphics g, string s, float x, float y)
        {
            Font font = new Font("宋体", 25, FontStyle.Bold);
            PointF pointF = new PointF(x, y);
            SizeF sizeF = g.MeasureString(s, font);
            g.FillRectangle(Brushes.White, new RectangleF(pointF, sizeF));
            g.DrawString(s, font, Brushes.Black, pointF);
        } 
    }
}

 主窗体设置壁纸等的代码FrmMain.cs如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Drawing2D;
using Microsoft.Win32;
using System.Collections;
using System.Runtime.InteropServices;
using System.Xml;
using System.Drawing.Imaging;

namespace SetWallpaper
{   
    public partial class FrmMain : Form
    {
        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);

        int screenWidth = Screen.PrimaryScreen.Bounds.Width;
        int screenHeight = Screen.PrimaryScreen.Bounds.Height;          
        FileInfo[] picFiles;
        public FrmMain()
        {
            InitializeComponent();           
        }
        private void FrmMain_Load(object sender, EventArgs e)
        {
            List<DictionaryEntry> list = new List<DictionaryEntry>(){
                new DictionaryEntry(1, "居中显示"),
                new DictionaryEntry(2, "平铺显示"),
                new DictionaryEntry(3, "拉伸显示")
            };
            cbWallpaperStyle.DisplayMember = "Value";
            cbWallpaperStyle.ValueMember = "Key";
            cbWallpaperStyle.DataSource = list;

            txtPicDir.Text = XmlNodeInnerText("");
            timer1.Tick += new EventHandler(timer_Tick);
            Text = string.Format("设置桌面壁纸(当前电脑分辨率{0}×{1})", screenWidth, screenHeight);
        }     
        /// <summary>
        /// 浏览单个图片
        /// </summary>
        private void btnBrowse_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog openFileDialog = new OpenFileDialog())
            {
                openFileDialog.Filter = "Images (*.BMP;*.JPG)|*.BMP;*.JPG;";
                openFileDialog.AddExtension = true;
                openFileDialog.RestoreDirectory = true;
                if (openFileDialog.ShowDialog() == DialogResult.OK)
                {
                    Bitmap img = (Bitmap)Bitmap.FromFile(openFileDialog.FileName);
                    pictureBox1.Image = img;
                    string msg = (img.Width != screenWidth || img.Height != screenHeight) ? "，建议选择和桌面分辨率一致图片" : "";
                    lblStatus.Text = string.Format("当前图片分辨率{0}×{1}{2}", img.Width, img.Height, msg);
                }
            }
        }

        /// <summary>
        /// 手动设置壁纸
        /// </summary>
        private void btnSet_Click(object sender, EventArgs e)
        {
            if (pictureBox1.Image == null)
            {
                MessageBox.Show("请先选择一张图片。");
                return;
            }
            Image img = pictureBox1.Image;           
            SetWallpaper(img);
        }

        private void SetWallpaper(Image img)
        {
            Bitmap bmp = Calendar.GetCalendarPic(img);
            string filename = Application.StartupPath + "/wallpaper.bmp";
            bmp.Save(filename, ImageFormat.Bmp);

            string tileWallpaper = "0";
            string wallpaperStyle = "0";
            string selVal = cbWallpaperStyle.SelectedValue.ToString();
            if (selVal == "1")
                tileWallpaper = "1";
            else if (selVal == "2")
                wallpaperStyle = "2";

            //写到注册表，避免系统重启后失效
            RegistryKey regKey = Registry.CurrentUser;
            regKey = regKey.CreateSubKey("Control Panel\\Desktop");
            //显示方式，居中：0 0， 平铺： 1 0， 拉伸： 0 2
            regKey.SetValue("TileWallpaper", tileWallpaper);
            regKey.SetValue("WallpaperStyle", wallpaperStyle);
            regKey.SetValue("Wallpaper", filename);
            regKey.Close();
            SystemParametersInfo(20, 1, filename, 1);
        }

       /// <summary>
       /// 浏览文件夹
       /// </summary>
        private void btnBrowseDir_Click(object sender, EventArgs e)
        {
            string defaultfilePath = XmlNodeInnerText("");
            using (FolderBrowserDialog dialog = new FolderBrowserDialog())
            {
                if (defaultfilePath != "")  
                    dialog.SelectedPath = defaultfilePath;                

                if (dialog.ShowDialog() == DialogResult.OK)                              
                    XmlNodeInnerText(dialog.SelectedPath);
              
                txtPicDir.Text = dialog.SelectedPath;
            }
        }       
        /// <summary>
        /// 获取或设置配置文件中的选择目录
        /// </summary>
        /// <param name="text"></param>
        /// <returns></returns>
        public string XmlNodeInnerText(string text)
        {
            string filename = Application.StartupPath + "/config.xml";
            XmlDocument doc = new XmlDocument();
            if (!File.Exists(filename))
            {
                XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "UTF-8", null);
                doc.AppendChild(dec);               
                XmlElement elem = doc.CreateElement("WallpaperPath");
                elem.InnerText = text;
                doc.AppendChild(elem);
                doc.Save(filename);
            }
            else
            {
                doc.Load(filename);
                XmlNode node = doc.SelectSingleNode("//WallpaperPath");
                if (node != null)
                {
                    if (string.IsNullOrEmpty(text))
                        return node.InnerText;
                    else
                    {
                        node.InnerText = text;
                        doc.Save(filename);
                    }
                }
            }
            return text;
        }    
        /// <summary>
        /// 定时自动设置壁纸
        /// </summary>
        private void btnAutoSet_Click(object sender, EventArgs e)
        {
            string path = txtPicDir.Text;
            if (!Directory.Exists(path))
            {
                MessageBox.Show("选择的文件夹不存在");
                return;
            }
            DirectoryInfo dirInfo = new DirectoryInfo(path);
            picFiles = dirInfo.GetFiles("*.jpg");
            if (picFiles.Length == 0)
            {
                MessageBox.Show("选择的文件夹里面没有图片");
                return;
            }
            if (btnAutoSet.Text == "开始")
            {
                timer1.Start();
                btnAutoSet.Text = "停止";
                lblStatus.Text = string.Format("定时自动换壁纸中...");            
            }
            else
            {
                timer1.Stop();
                btnAutoSet.Text = "开始";
                lblStatus.Text = "";
            }
        }
        /// <summary>
        /// 定时随机设置壁纸
        /// </summary>
        private void timer_Tick(object sender, EventArgs e)
        {            
            timer1.Interval = 1000 * 60 * (int)numericUpDown1.Value;
            FileInfo[] files = picFiles;
            if (files.Length > 0)
            {
                Random random = new Random();
                int r = random.Next(1, files.Length);

                Bitmap img = (Bitmap)Bitmap.FromFile(files[r].FullName);               
                pictureBox1.Image = img;

                SetWallpaper(img);
            }
        }
        /// <summary>
        /// 双击托盘图标显示窗体
        /// </summary>
        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            ShowForm();
        }
        /// <summary>  
        /// 隐藏窗体，并显示托盘图标  
        /// </summary>  
        private void HideForm()
        {
            this.Visible = false;
            this.WindowState = FormWindowState.Minimized;
            notifyIcon1.Visible = true;
        }

        /// <summary>  
        /// 显示窗体  
        /// </summary>  
        private void ShowForm()
        {
            this.Visible = true;
            this.WindowState = FormWindowState.Normal;
            notifyIcon1.Visible = false;
        }
        private void ToolStripMenuItemShow_Click(object sender, EventArgs e)
        {
            ShowForm();
        }
        /// <summary>  
        /// 退出  
        /// </summary>  
        private void toolStripMenuItemExit_MouseDown(object sender, MouseEventArgs e)
        {
            Application.Exit();
        }
        /// <summary>  
        /// 最小化时隐藏窗体，并显示托盘图标 
        /// </summary>  
        private void FrmMain_SizeChanged(object sender, EventArgs e)
        {
            if (this.WindowState == FormWindowState.Minimized)
            {
                HideForm();
            }
        }         
    }
}

 完整的项目代码下载：

http://download.csdn.net/detail/gdjlc/5096674