实例介绍
【实例简介】图片批量缩放程序
【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.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;
using System.Threading;
namespace ThumbnailImages
{
public delegate void DelegateStart();
public delegate void DelegateDoException(Exception ex);
public delegate void DelegateThreadFinished(string message);
public delegate void DelegateProgressBarPerformStep(int fileIndex, string filename);
public partial class frmMain : Form
{
int width = 1024, height = 768;
int percent = -1;
int totalFileCount = 0;
private Thread timedProgress;
string sourcePath, targetPath;
string[] files;
public DelegateStart DelegateStart;
public DelegateDoException DelegateDoException;
public DelegateThreadFinished DelegateThreadFinished;
public DelegateProgressBarPerformStep DelegateProgressBarPerformStep;
public frmMain()
{
InitializeComponent();
this.cbDefined.SelectedIndex = 2;
DelegateStart = new DelegateStart(this.Start);
DelegateThreadFinished = new DelegateThreadFinished(this.ThreadFinished);
DelegateDoException = new DelegateDoException(this.DoException);
DelegateProgressBarPerformStep = new DelegateProgressBarPerformStep(this.ProgressBarPerformStep);
}
private void btnStart_Click(object sender, EventArgs e)
{
string sourcePath = txtSource.Text;
string targetPath = txtTarget.Text;
if (sourcePath.Length == 0 || !Directory.Exists(sourcePath))
{
txtSource.Focus();
MessageBox.Show("请重新选择图片文件夹!", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
if (targetPath.Length == 0)
{
txtTarget.Focus();
MessageBox.Show("请重新选择缩略图保存路径!", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
if (!Directory.Exists(targetPath))
{
try
{
Directory.CreateDirectory(targetPath);
}
catch
{
txtTarget.Focus();
MessageBox.Show("请重新选择缩略图保存路径!", "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
}
GetImageSizeSetting();
//TimedProgressProc();
timedProgress = new Thread(new ThreadStart(TimedProgressProc));
timedProgress.IsBackground = true;
timedProgress.Start();
}
public void Start()
{
sourcePath = txtSource.Text;
targetPath = txtTarget.Text;
files = Directory.GetFiles(sourcePath);
totalFileCount = files.Length;
this.lblInfo.Text = string.Format("0/{0}", totalFileCount);
this.progressBar.Maximum = totalFileCount;
this.btnStart.Enabled = false;
this.btnStop.Enabled = true;
}
public void ThreadFinished(string message)
{
if (MessageBox.Show(message, "系统提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes)
{
System.Diagnostics.Process.Start(targetPath);
}
this.btnStart.Enabled = true;
this.btnStop.Enabled = false;
this.progressBar.Value = 0;
this.lblInfo.Text = "全部完成!";
}
public void DoException(Exception ex)
{
MessageBox.Show(ex.ToString(), "系统提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
this.btnStart.Enabled = true;
this.btnStop.Enabled = false;
this.progressBar.Value = 0;
}
public void ProgressBarPerformStep(int fileIndex, string filename)
{
progressBar.PerformStep();
filename = Path.GetFileName(filename);
this.lblInfo.Text = string.Format("{0}/{1}, 当前文件: {2}", fileIndex, totalFileCount, filename);
}
private void TimedProgressProc()
{
try
{
ImageCodecInfo icf = ImageHelper.GetImageCodecInfo(ImageFormat.Jpeg);
Image image, thumbnailImage;
string thumbnailImageFilename;
this.Invoke(this.DelegateStart);
int i = 0;
foreach (string filename in files)
{
if (timedProgress == null)
return;
//lblInfo.Text = string.Format("正在处理: {0} ", filename); ;
progressBar.Invoke(this.DelegateProgressBarPerformStep, new object[] { i , filename });
string extension = Path.GetExtension(filename).ToLower();
if (extension != ".jpg"
&& extension != ".jpeg"
&& extension != ".gif"
&& extension != ".bmp"
&& extension != ".png"
)
continue;
try
{
using (image = Image.FromFile(filename))
{
Size imageSize = GetImageSize(image);
using (thumbnailImage = ImageHelper.GetThumbnailImage(image, imageSize.Width, imageSize.Height))
{
thumbnailImageFilename = Path.GetFileNameWithoutExtension(filename) "_" thumbnailImage.Width "x" thumbnailImage.Height extension;
ImageHelper.SaveImage(thumbnailImage, Path.Combine(targetPath, thumbnailImageFilename), icf);
}
}
}
catch(Exception ex)
{
string em = ex.Message;
//lblInfo.Text = string.Format("{0} 可能不是合法的图片文件!", filename);
}
}
this.Invoke(this.DelegateThreadFinished, new object[] { "已经全部完成!\n是否打开生成的缩略图所在文件夹?" });
}
catch (ThreadInterruptedException e)
{
return;
}
catch (Exception ex)
{
this.Invoke(this.DelegateDoException, new Object[] { ex });
}
}
private Size GetImageSize(Image picture)
{
Size imageSize;
if (percent > 0)
{
imageSize = new Size(picture.Width * percent / 100, picture.Height * percent / 100);
}
else
imageSize = new Size(width, height);
double heightRatio = (double)picture.Height / picture.Width;
double widthRatio = (double)picture.Width / picture.Height;
int desiredHeight = imageSize.Height;
int desiredWidth = imageSize.Width;
imageSize.Height = desiredHeight;
if (widthRatio > 0)
imageSize.Width = Convert.ToInt32(imageSize.Height * widthRatio);
if (imageSize.Width > desiredWidth)
{
imageSize.Width = desiredWidth;
imageSize.Height = Convert.ToInt32(imageSize.Width * heightRatio);
}
return imageSize;
}
private void GetImageSizeSetting()
{
if (rbDefined.Checked)
{
if (cbDefined.SelectedIndex == 0)
{
width = 1024;
height = 768;
}
else if (cbDefined.SelectedIndex == 1)
{
width = 800;
height = 600;
}
else if (cbDefined.SelectedIndex == 2)
{
width = 640;
height = 480;
}
else if (cbDefined.SelectedIndex == 3)
{
width = 448;
height = 336;
}
else if (cbDefined.SelectedIndex == 4)
{
width = 314;
height = 235;
}
else if (cbDefined.SelectedIndex == 5)
{
width = 160;
height = 160;
}
}
else if (rbCustom.Checked)
{
width = (int)numWidth.Value;
height = (int)numHeight.Value;
}
else if (rbDefined.Checked)
{
percent = (int)numPercent.Value;
}
}
private void cbDefined_SelectedIndexChanged(object sender, EventArgs e)
{
if (!rbDefined.Checked)
rbDefined.Checked = true;
}
private void btnBrowserSource_Click(object sender, EventArgs e)
{
if (folderBrowserDialog.ShowDialog() == DialogResult.OK)
{
txtSource.Text = folderBrowserDialog.SelectedPath;
if (txtTarget.Text.Length == 0)
txtTarget.Text = Path.Combine(folderBrowserDialog.SelectedPath, "ThumbnailImages");
}
}
private void btnBrowserTarget_Click(object sender, EventArgs e)
{
if (folderBrowserDialog.ShowDialog() == DialogResult.OK)
{
txtTarget.Text = folderBrowserDialog.SelectedPath;
}
}
private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
{
// Change the color of the link text by setting LinkVisited
// to true.
linkLabel1.LinkVisited = true;
//Call the Process.Start method to open the default browser
//with a URL:
System.Diagnostics.Process.Start("http://www.openlab.net.cn");
}
private void btnStop_Click(object sender, EventArgs e)
{
if (timedProgress != null)
{
timedProgress.Interrupt();
timedProgress = null;
ThreadFinished("已经取消!\n是否打开生成的缩略图所在文件夹?");
this.lblInfo.Text = "已取消!";
}
}
}
}
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