03-图像操作/压缩图片/无损压缩/CompressImg/Form1.cs

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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.Collections;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Threading;
namespace CompressImg
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        FileSystemInfo[] fsi=null;
        string ImgPath = "";
        ArrayList al = new ArrayList();
        string ImgSavePath = "";
        string strSourcePath = "";
        Thread td;
        Image ig = null;
        string strSavePath = "";
        private void Form1_Load(object sender, EventArgs e)
        {
            CheckForIllegalCrossThreadCalls = false;
        }

        /// <summary>
        /// 无损图片缩放
        /// </summary>
        /// <param name="sFile">图片的原始路径</param>
        /// <param name="dFile">缩放后图片的保存路径</param>
        /// <param name="dHeight">缩放后图片的高度</param>
        /// <param name="dWidth">缩放后图片的宽度</param>
        /// <returns></returns>
                      
        public static bool GetPicThumbnail(string sFile, string dFile, int dHeight, int dWidth)
        {
            Image iSource = Image.FromFile(sFile);
            ImageFormat tFormat = iSource.RawFormat;
            int sW = 0, sH = 0;
            // 按比例缩放
            Size tem_size = new Size(iSource.Width,iSource.Height);
            if (tem_size.Height> dHeight || tem_size.Width> dWidth)
            {
                if ((tem_size.Width * dHeight) > (tem_size.Height * dWidth))
                {
                    sW = dWidth;
                    sH = (dWidth * tem_size.Height) / tem_size.Width;
                }
                else
                {
                    sH = dHeight;