实例介绍
【实例简介】选择某一个目录，将某一个目录下的所有图片读取出来 并以缩略图的形式展现
【实例截图】
【核心代码】
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.IO;
using System.Drawing.Imaging;
using System.Threading;
namespace ImgMicroimage
{
public partial class Frm_Main : Form
{
public class CustomListView : ListView
{
public CustomListView()
{
SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true);
UpdateStyles();
}
}
CustomListView clv = new CustomListView();
public Frm_Main()
{
InitializeComponent();
}
string filePath;
public Image ResourceImage;
private int ImageWidth;
private int ImageHeight;
public string ErrMessage;
public Thread td;
public bool GetReducedImage(double Percent, string targetFilePath)
{
try
{
Bitmap bt = new Bitmap(120, 120); //创建Bitmap实例
Graphics g = Graphics.FromImage(bt); //创建Graphics实例
g.Clear(Color.White); //设置画布背景颜色为白色
Image ReducedImage; //缩略图
Image.GetThumbnailImageAbort callb = new Image.GetThumbnailImageAbort(ThumbnailCallback);
ImageWidth = Convert.ToInt32(ResourceImage.Width * Percent); //设置宽度
ImageHeight = Convert.ToInt32(ResourceImage.Height * Percent); //设置高度
//获取所谓图
ReducedImage = ResourceImage.GetThumbnailImage(ImageWidth, ImageHeight, callb, IntPtr.Zero);
if (ImageWidth > ImageHeight) //如果原图宽度大于高度
{
//缩放图片
g.DrawImage(ReducedImage, 0, (int)(120 - ImageHeight) / 2, ImageWidth, ImageHeight);
}
else
{
g.DrawImage(ReducedImage, (int)(120 - ImageWidth) / 2, 0, ImageWidth, ImageHeight);
}
g.DrawRectangle(new Pen(Color.Gray), 0, 0, 119, 119); //绘制缩略图的边框
bt.Save(@targetFilePath, ImageFormat.Jpeg); //保存缩略图
bt.Dispose(); //释放对象
ReducedImage.Dispose(); //释放对象
return true;
}
catch (Exception e)
{
ErrMessage = e.Message;
return false;
}
}
public bool ThumbnailCallback()
{
return false;
}
private void a()
{
double percent;
string[] a = new string[2];
DirectoryInfo di = new DirectoryInfo(filePath);
FileSystemInfo[] fi = di.GetFileSystemInfos();
DirectoryInfo di2 = new DirectoryInfo("c:\\LsTemp");
for (int i = 0; i < fi.Length; i )
{
string imgType = fi[i].ToString().Substring(fi[i].ToString().LastIndexOf(".") 1, fi[i].ToString().Length - 1 - fi[i].ToString().LastIndexOf("."));
if (imgType.ToLower() == "jpeg" || imgType.ToLower() == "gif" || imgType.ToLower() == "png" || imgType.ToLower() == "jpg" || imgType.ToLower() == "bmp")
{
string imgName = fi[i].ToString();
imgName = imgName.Remove(imgName.LastIndexOf("."));
string newPath;
if (filePath.Length == 3)
{
newPath = filePath imgName "." imgType;
}
else
{
newPath = filePath "\\" imgName "." imgType;
}
ResourceImage = Image.FromFile(newPath);
if (ResourceImage.Width < ResourceImage.Height)
{
percent = (double)120 / ResourceImage.Height;
}
else
{
percent = (double)120 / ResourceImage.Width;
}
if (!di2.Exists)
{
Directory.CreateDirectory("c:\\LsTemp");
if (GetReducedImage(percent, "c:\\LsTemp\\_" imgName ".JPG"))
{
imageList1.Images.Add(i.ToString(), Image.FromFile("c:\\LsTemp\\_" imgName ".JPG"));
a[0] = imgName "." imgType;
ListViewItem lvi = new ListViewItem(a);
lvi.ImageKey = i.ToString();
clv.Items.Add(lvi);
}
}
else
{
if (GetReducedImage(percent, "c:\\LsTemp\\_" imgName ".JPG"))
{
imageList1.Images.Add(i.ToString(), Image.FromFile("c:\\LsTemp\\_" imgName ".JPG"));
a[0] = imgName "." imgType;
ListViewItem lvi = new ListViewItem(a);
lvi.ImageKey = i.ToString();
clv.Items.Add(lvi);
}
}
ResourceImage.Dispose();
}
tsslText.Text = "共有" this.clv.Items.Count.ToString() "张图片";
}
td.Abort();
}
private void toolStripButton1_Click_1(object sender, EventArgs e)
{
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
clv.Items.Clear();
filePath = folderBrowserDialog1.SelectedPath;
td = new Thread(new ThreadStart(a));
td.Start();
}
}
private void toolStripButton2_Click(object sender, EventArgs e)
{
Application.Exit();
}
private void deletefile()
{
try
{
DirectoryInfo di2 = new DirectoryInfo("c:\\LsTemp");
if (di2.Exists)
{
Scripting.FileSystemObject fso = new Scripting.FileSystemObject();
fso.DeleteFolder("c:\\LsTemp", true);
}
}
catch
{
deletefile();
}
}
private void Form1_FormClosed(object sender, FormClosedEventArgs e)
{
if (td != null)
{
td.Abort();
}
deletefile();
}
private void clv_Click(object sender, EventArgs e)
{
if (clv.SelectedItems.Count > 0)
{
string pName = clv.SelectedItems[0].Text;
if (filePath.Length == 3)
{
tsslPath.Text = "图片路径：" filePath pName;
}
else
{
tsslPath.Text = "图片路径：" filePath "\\" pName;
}
}
}
private void clv_DoubleClick(object sender, EventArgs e)
{
if (clv.SelectedItems.Count > 0)
{
string pName = clv.SelectedItems[0].Text;
if (filePath.Length == 3)
{
System.Diagnostics.Process.Start(filePath pName);
tsslPath.Text = "图片路径：" filePath pName;
}
else
{
System.Diagnostics.Process.Start(filePath "\\" pName);
tsslPath.Text = "图片路径：" filePath "\\" pName;
}
}
}
private void Form1_Load(object sender, EventArgs e)
{
CheckForIllegalCrossThreadCalls = false;
panel1.Controls.Add(clv);
clv.Dock = DockStyle.Fill;
clv.LargeImageList = imageList1;
clv.View = View.LargeIcon;
clv.DoubleClick = new EventHandler(clv_DoubleClick);
clv.Click =new EventHandler(clv_Click);
}
}
}
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