win7自动壁纸切换小工具AutoDesk一：初始化托盘

win7的自带主题自动切换壁纸的功能挺不错，美中不足的是图片只能放本地，我一千多张背景图片占了不少磁盘空间，遂萌生写一个类似的自动切换软件，图片则从网上下载。

计划工具分两部分，一是本地切换部分，一是网上下载部分。先说本地切换部分。

本地切换部分，要实现的功能包括：初始化托盘，手动切换，定时切换，开机自启动等功能。

一，初始化托盘

这个功能博客园有很多文章，大家可以参考。基本上实现的功能包括，初始化时最小化到托盘，实现托盘右键菜单功能，双击显示主界面。

托盘的菜单如下图：

主界面就是“下一个”按钮。

拖动notifyicon控件到主窗体，拖动菜单到主窗体，设置notifyicon的菜单项为床窗体菜单。

窗体实现部分如下：

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;
using Microsoft.Win32;
using System.IO;

namespace AutoDesk
{
    public partial class AutoDesk : Form
    {
        // 存放壁纸的文件位置
        private string m_deskpick_path = "E:\\deskPic";
        private string m_pick_name = "3.jpg";
        // 记录快捷键的键码
        private int Hotkey1;
        // 记录是否关闭窗体。
        private DialogResult m_dialogResult = DialogResult.No;


        public AutoDesk()
        {
            InitializeComponent();
            
        }

        /// <summary>
        /// 从m_deskpick_path文件夹中随即选取一个文件
        /// </summary>
        /// <returns></returns>
        private string get_random_pick_name()
        {
            Random random = new Random(Environment.TickCount);
            string pick_name = "3.jpg";
            DirectoryInfo dInfo = new DirectoryInfo(m_deskpick_path);
            FileInfo[] files = dInfo.GetFiles();//"*.jpg|*.gif|*.png|*.bmp");
            if (files != null && files.Length > 0)
            {
                int index = random.Next(0, files.Length);
                pick_name = files[index].Name;
            }
            return pick_name;
        }

        /// <summary>
        /// 通过IActiveDesktop接口切换桌面，
        /// IActiveDesktop接口切换桌面具有win7的渐变效果（fade effect或者称为slideshow）
        /// 而通过SystemParametersInfo函数也能实现切换壁纸，但是没有渐变效果。
        /// 
        /// </summary>
        private void switch_to_next_waller()
        {
            string strSavePath = Path.Combine(m_deskpick_path, get_random_pick_name());
            //WinAPI.SystemParametersInfo(20, 1, strSavePath, 1);
            IActiveDesktop iad = shlobj.GetActiveDesktop();
            iad.SetWallpaper(strSavePath, 0);
            iad.ApplyChanges(AD_Apply.ALL | AD_Apply.FORCE | AD_Apply.BUFFERED_REFRESH);
            System.Runtime.InteropServices.Marshal.ReleaseComObject(iad);
        }

        /// <summary>
        /// 主界面切换下一桌面的实现。
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btn_center_Click(object sender, EventArgs e)
        {
            try
            {
                switch_to_next_waller();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// 最小化到托盘，要实现初始化到托盘，需要设置窗体的初始状态为最小化。
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void AutoDesk_SizeChanged(object sender, EventArgs e)
        {
            try
            {
                if (this.WindowState == FormWindowState.Minimized)
                {
                    this.Hide();
                    this.notifyIcon1.Visible = true;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void notifyIcon1_Click(object sender, EventArgs e)
        {
            try
            {
                //this.Visible = true;
                //this.WindowState = FormWindowState.Normal;
                //this.notifyIcon1.Visible = false; 
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// 菜单项实现切换到下一桌面
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void NextToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                switch_to_next_waller();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

        }

        /// <summary>
        /// 菜单项退出应用程序
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                m_dialogResult = System.Windows.Forms.DialogResult.Yes;
                this.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// 菜单项显示主界面
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void showMainFrmToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                this.Visible = true;
                this.WindowState = FormWindowState.Normal;
                
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// 窗体关闭相应事件。如果是点击窗体的关闭按钮，则只是隐藏。
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void AutoDesk_FormClosing(object sender, FormClosingEventArgs e)
        {
            try
            {
                if (m_dialogResult == System.Windows.Forms.DialogResult.Yes)
                {
                    e.Cancel = false;
                    Application.Exit();
                }
                else
                {
                    e.Cancel = true;
                    this.Hide();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// 窗体启动时挂载全局快捷键Ctrl+F1.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void AutoDesk_Load(object sender, EventArgs e)
        {
            try
            {
                
                 SystemHotKey.Hotkey hotkey;
                 hotkey = new SystemHotKey.Hotkey(this.Handle);  
       
                 //定义快键(Ctrl + F1)  
                 Hotkey1 = hotkey.RegisterHotkey(System.Windows.Forms.Keys.F1, SystemHotKey.Hotkey.KeyFlags.MOD_CONTROL);
                 hotkey.OnHotkey += new SystemHotKey.HotkeyEventHandler(OnHotkey);

            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        /// <summary>
        /// 快捷键按下后切换到下一个随即壁纸。
        /// </summary>
        /// <param name="HotkeyID"></param>
         public void OnHotkey(int HotkeyID)  
         {
             try
             {
                 if (HotkeyID == Hotkey1)
                 {
                     switch_to_next_waller();
                 }
                 else
                 {
                     //this.Visible = false;  
                 }
             }
             catch (Exception ex)
             {
                 MessageBox.Show(ex.Message);
             }
         }  

        /// <summary>
        /// 托盘双击显示主界面
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void notifyIcon1_DoubleClick(object sender, EventArgs e)
        {
            try
            {
                this.Visible = true;
                this.WindowState = FormWindowState.Normal;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }
}