程序
使用C#制作的更换桌面背景程序
今天是周末,可是没什么地方去,所以有上网来了,突然发现了一篇用
VB调用API来更换桌面的程序,我想既然VB可以C#也一定能行,所以就
试着做了一下,好吧,来看看我的代码吧.一步一步来,你也能行.
那还是先让我们来了解一个API吧,SystemParametersInfo,这个API的功能
很简单就是通过一些参数的设置来完成对系统的一些外观设置.
函数原型如下:
BOOL SystemParametersInfo(
UINT uiAction,
UINT uiParam,
PVOID pvParam,
UINT fWinIni
);
该函数返回一个Bool值.非0成功,否则当然是失败了,那样的话根据MSDN的说法
还将会设置GetLastError(关于这一点可以参考MSDN)
这里还必须提到的一点是,关于uAction常数表,这张表里面包括了很多关于这些参数
的设置工作.因为它将影响到.前面两个参数.第三个参数在我们这里的用法是得到
图片的路径.第四个参数看名字也猜的到.随同这个函数设置的用户配置参数保存在win.ini
或注册表里，或同时保存在这两个地方.一般是0X1或者0X2就可以了.
下面我在给出有关该API变成C#的代码如下:
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int SystemParametersInfo (int uAction , int uParam , string lpvParam , int fuWinIni) ;
//图片
看见上面的图了吗?我来主要说说那个两个button,
首先叫到的是选择按钮代码如下:
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);
}
else
filepath=textBox1.Text;
this.pictureBox1.Image=bm;
}
正如你看到的,那样,由于只能将BMP图象设置成桌面所以必须要转化一下,上面是我的方法
也许你还有更好的,那就说说吧.
然后是更换按钮,代码如下:
private void button2_Click(object sender, System.EventArgs e)
{
int nResult ;
if (File.Exists(filepath))
{
nResult = SystemParametersInfo(20, 1, 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!");
}
这个实现起来在简单不过了,仅仅是调用刚才上面讲到的API就可以了.
好了,我把全部代码都给你,很简单,如下:
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 desktopWalk
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : 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 Form1()
{
//
// 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 Form1());
}
private void button2_Click(object sender, System.EventArgs e)
{
int nResult ;
if (File.Exists(filepath))
{
nResult = SystemParametersInfo(20, 1, 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);
}
else
filepath=textBox1.Text;
this.pictureBox1.Image=bm;
}
}
}
}