[工具]图片等比例压缩工具

写在前面

在网盘中有这样一个功能，需要获取所有图片的列表，想来想去，觉得还是生成相同比例的图片，在排版上更美观一些。所以就没事高了一个压缩的工具玩玩。

代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Wolfy.ImageCompress
{
public partial class MainForm : Form
{
public MainForm()
{
InitializeComponent();
}
private string _strImageFilter = "All Image Files|*.bmp;*.ico;*.gif;*.jpeg;*.jpg;*.png;*.tif;*.tiff|" +
"Windows Bitmap(*.bmp)|*.bmp|" +
"Windows Icon(*.ico)|*.ico|" +
"Graphics Interchange Format (*.gif)|(*.gif)|" +
"JPEG File Interchange Format (*.jpg)|*.jpg;*.jpeg|" +
"Portable Network Graphics (*.png)|*.png|" +
"Tag Image File Format (*.tif)|*.tif;*.tiff";
private string[] filePaths = null;
private void btnOpenImage_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = _strImageFilter;
ofd.Multiselect = true;
if (ofd.ShowDialog(this) == System.Windows.Forms.DialogResult.OK)
{
filePaths = ofd.FileNames;
}
if (filePaths != null)
{
this.plBefore.BackgroundImage = Image.FromFile(filePaths[0]);
}
}

/// <summary>
/// 等比例压缩图片
/// </summary>
private async Task<string> SaveImageByWidthHeight(int intImgCompressWidth, int intImgCompressHeight, Stream stream, string strFileSavePath)
{
return await Task.Run<string>(() =>
{
//从输入流中获取上传的image对象
using (Image img = Image.FromStream(stream))
{
//根据压缩比例求出图片的宽度
int intWidth = intImgCompressWidth / intImgCompressHeight * img.Height;
int intHeight = img.Width * intImgCompressHeight / intImgCompressWidth;
//画布
using (System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(img, new Size(intImgCompressWidth, intImgCompressHeight)))
{
//在画布上创建画笔对象
using (System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(bitmap))
{
//将图片使用压缩后的宽高,从0，0位置画在画布上
graphics.DrawImage(img, 0, 0, intImgCompressWidth, intImgCompressHeight);
//保存图片
bitmap.Save(strFileSavePath);
}
}
}
return strFileSavePath;
});

}
/// <summary>
/// 界面压缩比例信息提示
/// </summary>
/// <param name="width"></param>
/// <param name="height"></param>
private string SetCompressMsg(int width, int height)
{
this.txtWidth.Text = width.ToString();
this.txtHeight.Text = height.ToString();
this.plImageCompress.Width = width;
this.plImageCompress.Height = height;
this.lblImageAfter.Text = width.ToString() + "X" + height.ToString();
return this.lblImageAfter.Text;
}
private void MainForm_Load(object sender, EventArgs e)
{
SetCompressMsg(80, 80);
}

private void btnSave_Click(object sender, EventArgs e)
{
FolderBrowserDialog fbd = new FolderBrowserDialog();

if (fbd.ShowDialog(this) == System.Windows.Forms.DialogResult.OK)
{
this.txtSavePath.Text = fbd.SelectedPath;
}

}

private async void btnRun_Click(object sender, EventArgs e)
{
if (string.IsNullOrEmpty(this.txtHeight.Text) || string.IsNullOrEmpty(this.txtWidth.Text))
{
MessageBox.Show("请填写压缩后的图片的宽高");
return;
}
if (string.IsNullOrEmpty(this.txtSavePath.Text))
{
MessageBox.Show("请选择文件保存路径");
return;
}
int width = Convert.ToInt32(this.txtWidth.Text);
int height = Convert.ToInt32(this.txtHeight.Text);
if (width <= 0 || height <= 0)
{
MessageBox.Show("宽高数据不合法，请重新填写");
return;
}
string saveformat = SetCompressMsg(width, height);
if (filePaths != null)
{
foreach (var path in filePaths)
{
string fileName = Path.GetFileNameWithoutExtension(path);
string fileExt = Path.GetExtension(path);
this.plBefore.BackgroundImage = Image.FromFile(path);
string fileNewName = fileName + "_" + saveformat + fileExt;
string fileSavePath = Path.Combine(this.txtSavePath.Text, fileNewName);
using (FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read))
{
await SaveImageByWidthHeight(width, height, fs, fileSavePath);
this.plImageCompress.BackgroundImage = Image.FromFile(fileSavePath);
}

}
}
else
{
MessageBox.Show("请选择图片");
}
}

}
}

界面



支持图片多选

压缩后

总结

工具实现起来很简单，通过异步的方式进行压缩，速度还是比较快的。