C#.Net 修改桌面背景圖（一）

这里介绍的是利用API函数修改窗口的背景图。

程序代码

[DllImport("user32.dll",   EntryPoint="SystemParametersInfo")]   

  public   static   extern   int   SystemParametersInfo   (   

  int   uAction,   

  int   uParam,   

  string   lpvParam,   

  int   fuWinIni   

  );   

  SystemParametersInfo(20,   0,   @"C:/temp.bmp",   0x2);  

在这里需要注意的是SystemParametersInfo只对bmp格式图片有效，如果直接吧jpg后缀改成bmp是无效的，所以需要把图片转换bmp。

程序代码

    Bitmap bm=new Bitmap("temp.jpg");

    bm.Save("temp.bmp",System.Drawing.Imaging.ImageFormat.Bmp);

上传源码：

程序代码

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using System.Runtime.InteropServices;

using System.IO;

namespace Desktop

{

    /// <summary>

    /// DeskT 的摘要说明。

    /// </summary>

    public class DeskT : System.Windows.Forms.Form

    {

        private System.Windows.Forms.Button button1;

        private System.Windows.Forms.Button button2;

        private System.Windows.Forms.TextBox textBox1;

        private System.Windows.Forms.GroupBox groupBox1;

        private System.Windows.Forms.GroupBox groupBox2;

        private System.Windows.Forms.Label label1;

        private System.Windows.Forms.PictureBox pictureBox1;

        private System.Windows.Forms.Label label2;

        private System.Windows.Forms.OpenFileDialog openFileDialog1;

        private string filepath;

        /// <summary>

        /// 必需的设计器变量。

        /// </summary>

        private System.ComponentModel.Container components = null;

        [DllImport("user32.dll", CharSet=CharSet.Auto)]

        public static  extern int SystemParametersInfo (int uAction , int uParam , string lpvParam , int fuWinIni) ;

        public DeskT()

        {

            //

            // Windows 窗体设计器支持所必需的

            //

            InitializeComponent();

            //

            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码

            //

        }

        /// <summary>

        /// 清理所有正在使用的资源。

        /// </summary>

        protected override void Dispose( bool disposing )

        {

            if( disposing )

            {

                if (components != null) 

                {

                    components.Dispose();

                }

            }

            base.Dispose( disposing );

        }

        #region Windows Form Designer generated code

        /// <summary>

        /// 设计器支持所需的方法 - 不要使用代码编辑器修改

        /// 此方法的内容。

        /// </summary>

        private void InitializeComponent()

        {

            this.button1 = new System.Windows.Forms.Button();

            this.button2 = new System.Windows.Forms.Button();

            this.textBox1 = new System.Windows.Forms.TextBox();

            this.groupBox1 = new System.Windows.Forms.GroupBox();

            this.label2 = new System.Windows.Forms.Label();

            this.pictureBox1 = new System.Windows.Forms.PictureBox();

            this.label1 = new System.Windows.Forms.Label();

            this.groupBox2 = new System.Windows.Forms.GroupBox();

            this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();

            this.groupBox1.SuspendLayout();

            this.SuspendLayout();

            // 

            // button1

            // 

            this.button1.Location = new System.Drawing.Point(312, 62);

            this.button1.Name = "button1";

            this.button1.TabIndex = 0;

            this.button1.Text = "选择背景";

            this.button1.Click += new System.EventHandler(this.button1_Click);

            // 

            // button2

            // 

            this.button2.Location = new System.Drawing.Point(312, 120);

            this.button2.Name = "button2";

            this.button2.TabIndex = 1;

            this.button2.Text = "更换背景";

            this.button2.Click += new System.EventHandler(this.button2_Click);

            // 

            // textBox1

            // 

            this.textBox1.Location = new System.Drawing.Point(16, 64);

            this.textBox1.Name = "textBox1";

            this.textBox1.Size = new System.Drawing.Size(272, 21);

            this.textBox1.TabIndex = 2;

            this.textBox1.Text = "";

            // 

            // groupBox1

            // 

            this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {

                                                                                    this.label2,

                                                                                    this.pictureBox1,

                                                                                    this.label1,

                                                                                    this.groupBox2,

                                                                                    this.button1,

                                                                                    this.button2,

                                                                                    this.textBox1});

            this.groupBox1.Location = new System.Drawing.Point(16, 16);

            this.groupBox1.Name = "groupBox1";

            this.groupBox1.Size = new System.Drawing.Size(392, 240);

            this.groupBox1.TabIndex = 3;

            this.groupBox1.TabStop = false;

            this.groupBox1.Text = "更换背景图片";

            // 

            // label2

            // 

            this.label2.Location = new System.Drawing.Point(8, 128);

            this.label2.Name = "label2";

            this.label2.Size = new System.Drawing.Size(72, 23);

            this.label2.TabIndex = 6;

            this.label2.Text = "预览图片:";

            // 

            // pictureBox1

            // 

            this.pictureBox1.Location = new System.Drawing.Point(104, 120);

            this.pictureBox1.Name = "pictureBox1";

            this.pictureBox1.Size = new System.Drawing.Size(184, 104);

            this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;

            this.pictureBox1.TabIndex = 5;

            this.pictureBox1.TabStop = false;

            // 

            // label1

            // 

            this.label1.Location = new System.Drawing.Point(24, 24);

            this.label1.Name = "label1";

            this.label1.Size = new System.Drawing.Size(64, 23);

            this.label1.TabIndex = 4;

            this.label1.Text = "背景图片:";

            // 

            // groupBox2

            // 

            this.groupBox2.Location = new System.Drawing.Point(8, 104);

            this.groupBox2.Name = "groupBox2";

            this.groupBox2.Size = new System.Drawing.Size(376, 8);

            this.groupBox2.TabIndex = 3;

            this.groupBox2.TabStop = false;

            // 

            // Form1

            // 

            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

            this.ClientSize = new System.Drawing.Size(432, 269);

            this.Controls.AddRange(new System.Windows.Forms.Control[] {

                                                                          this.groupBox1});

            this.MaximizeBox = false;

            this.Name = "Form1";

            this.StartPosition = System.Windows.Forms.FormStartPosition.CenterParent;

            this.Text = "设置背景";

            this.groupBox1.ResumeLayout(false);

            this.ResumeLayout(false);

        }

        #endregion

//        /// <summary>

//        /// 应用程序的主入口点。

//        /// </summary>

//        [STAThread]

//        static void Main() 

//        {

//            Application.Run(new DeskT());

//        }

        private void button2_Click(object sender, System.EventArgs e)

        {

            int nResult ;

            if (File.Exists(filepath))

            {

                nResult = SystemParametersInfo(20, 0, filepath,  0x1 | 0x2 );

                if(nResult==0)

                    MessageBox.Show("没有更新成功!");

                else

                    MessageBox.Show("正在更换背景图片...");

            }

            else

                MessageBox.Show("文件不存在!");

        }

        private void button1_Click(object sender, System.EventArgs e)

        {

            openFileDialog1.InitialDirectory = @"C:/";

            if (openFileDialog1.ShowDialog() == DialogResult.OK)

            {

                textBox1.Text = openFileDialog1.FileName;

                string[] strA=textBox1.Text.Split('.');

                Bitmap bm=new Bitmap(textBox1.Text);

                if(strA[1]!="bmp")

                {

                    filepath=strA[0]+".bmp";

                    bm.Save(filepath,System.Drawing.Imaging.ImageFormat.Bmp);

                }

                else

                    filepath=textBox1.Text;

                this.pictureBox1.Image=bm;

            }

        }

    }

}

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