如何将一个文件夹中所有的bmp文件转化成同名的jpg文件

Question

如何将一个文件夹中所有的bmp文件转化成同名的jpg文件

Answer 1

DirectoryInfo   Dir=new   DirectoryInfo(dir);   
foreach(FileInfo   f   in   Dir.GetFiles("*.*"))          
  {   
    Image img=ReturnPhot(f.FullName);
  }   
 
  private Image ReturnPhoto(string bmpFileName)
        {
          System.IO.FileStream stream ;
           stream=File.OpenRead(bmpFileName);
           Bitmap bmp = new Bitmap(stream);
           System.Drawing.Image image = bmp;
            System.Drawing.Image newImage = image.GetThumbnailImage(bmp.Width, bmp.Height, null, new IntPtr());
            Graphics g=Graphics.FromImage(newImage);
            g.DrawImage(newImage,0,0, newImage.Width, newImage.Height);             g.Dispose();
            stream.Close();
            return newImage;
        }
}

Answer 2

补充第2种做法： string strPath = @"d:\pic";
            DirectoryInfo path = new DirectoryInfo(strPath);
            FileInfo[] files = path.GetFiles("*.bmp", SearchOption.AllDirectories);
            foreach (var item in files)
            {
                Image img = Image.FromFile(item.FullName);
                string strNewFileName = Regex.Replace(item.FullName, @"\.bmp$", ".jpg",RegexOptions.IgnoreCase);
                img.Save(strNewFileName, ImageFormat.Jpeg);
                img.Dispose();
            }

Answer 3

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Text.RegularExpressions;//正则表达式Regex在的命名空间
namespace 图片处理
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }        private void button1_Click(object sender, EventArgs e)
        {
            //含子文件夹的图像转换
            folderBrowserDialog1.ShowDialog();
            string strPath = folderBrowserDialog1.SelectedPath;
            //string strPath = @"d:\pic";
            DirectoryInfo path = new DirectoryInfo(strPath);
            FileInfo[] files = path.GetFiles("*.bmp", SearchOption.AllDirectories);
            foreach (FileInfo item in files)
            {
                Image img = Image.FromFile(item.FullName);
                string strNewFileName = Regex.Replace(item.FullName, @"\.bmp$", ".jpg", RegexOptions.IgnoreCase);
                img.Save(strNewFileName, System.Drawing.Imaging.ImageFormat.Jpeg);
                img.Dispose();
            }
        }        private void button2_Click(object sender, EventArgs e)
        {
            //指定文件夹的图像转换
            folderBrowserDialog1.ShowDialog();
            string strPath = folderBrowserDialog1.SelectedPath;
            DirectoryInfo  Dir=new  DirectoryInfo(strPath);
            foreach(FileInfo  f  in  Dir.GetFiles("*.*")) 
            {
                Image img=ReturnPhoto(f.FullName);
                string strNewFileName = Regex.Replace(f.FullName, @"\.bmp$", ".jpg", RegexOptions.IgnoreCase);
                img.Save(strNewFileName, System.Drawing.Imaging.ImageFormat.Jpeg);
                img.Dispose();
            }
        }
        private Image ReturnPhoto(string bmpFileName) 
        { 
          System.IO.FileStream stream ; 
          stream=File.OpenRead(bmpFileName); 
          Bitmap bmp = new Bitmap(stream); 
          System.Drawing.Image image = bmp; 
          System.Drawing.Image newImage = image.GetThumbnailImage(bmp.Width, bmp.Height, null, new IntPtr()); 
          Graphics g=Graphics.FromImage(newImage); 
          g.DrawImage(newImage,0,0, newImage.Width, newImage.Height); 
          g.Dispose(); 
          stream.Close(); 
          return newImage; 
        }         
    }
}

Answer 4

读进来 在存进jpg里面去。
一个一个来