高分,跪着爬着求代码,C#改变桌面背景图片.

Question

高分,跪着爬着求代码,C#改变桌面背景图片.各位哥哥,请给详细的代码,详细的.

Answer 1

1、SystemParametersInfo   设定背景的API
2、System.Drawing.Bitmap bm=new System.Drawing.Bitmap(strPathJpg);
                    bm.Save(strPathBmp,System.Drawing.Imaging.ImageFormat.Bmp);,把jpg转成bmpusing System; 
using System.IO; 
using System.Runtime.InteropServices; 
using System.Text;
using System.Windows;
using System.Windows.Forms;
namespace Desktop
{
    /// <summary>
    /// ClassDesktop 的摘要说明。
    /// </summary>
    public class ClassDesktop
    {
        public string strPath="";        [DllImport("user32.dll",   EntryPoint="SystemParametersInfo")]   
        public   static   extern   int   SystemParametersInfo   (   
            int   uAction,   
            int   uParam,   
            string   lpvParam,   
            int   fuWinIni   
            );        public ClassDesktop()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }        public ClassDesktop(string strpath)
        {
            strPath=strpath;
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
        /// <summary>
        /// 设置桌面背景
        /// </summary>
        /// <param name="Path"></param>
        public void Desktop(string Path)
        {
            if (File.Exists(Path))
            SystemParametersInfo(20, 0, Path,   0x2); // 0x1 | 0x2 
        }
        public void Font()
        {
        //    System.IntPtr p=GetDC(0);
            //System.Drawing.Graphics g=System.Drawing.Graphics.FromHdc(p);
            
        }
        public void setDesktop()
        {
            //取得每天需要显示的图片
            string strPathJpg="";
            string strPathBmp="";
            strPathJpg=Application.StartupPath+"\\"+DateTime.Today.Day.ToString()+".jpg ";
            strPathBmp=Application.StartupPath+"\\"+DateTime.Today.Day.ToString()+".bmp";
            if (File.Exists(strPathBmp))
            {
                this.Desktop(strPathBmp);
            }
            else
            {
                if (File.Exists(strPathJpg))
                {
                    //
                                    }
                else
                {
                    MessageBox.Show(strPathJpg);
                    return;
                }
            }            //MessageBox.Show(strPathJpg);        }
    }
}引自:http://hi.baidu.com/cocoxili/blog/item/ed79e219cc5d104043a9ada8.html