Base64編碼的字串與圖片的轉換 C#__編碼

 

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.Drawing.Imaging;namespace base64_img{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        //圖片 轉為    base64編碼的文本        private void button1_Click(object sender, EventArgs e)        {            OpenFileDialog dlg = new OpenFileDialog();            dlg.Title = "選擇要轉換的圖片";            dlg.Filter = "Image files (*.jpg;*.bmp;*.gif)|*.jpg*.jpeg;*.gif;*.bmp|AllFiles (*.*)|*.*";            if (DialogResult.OK == dlg.ShowDialog())            {                ImgToBase64String(dlg.FileName);            }        }        //圖片 轉為    base64編碼的文本        private void ImgToBase64String(string Imagefilename)        {            try            {                Bitmap bmp = new Bitmap(Imagefilename);                this.pictureBox1.Image = bmp;                FileStream fs = new FileStream(Imagefilename + ".txt", FileMode.Create);                StreamWriter sw = new StreamWriter(fs);                MemoryStream ms = new MemoryStream();                bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);                byte[] arr = new byte[ms.Length];                ms.Position = 0;                ms.Read(arr, 0, (int)ms.Length);                ms.Close();                String strbaser64 = Convert.ToBase64String(arr);                sw.Write(strbaser64);                sw.Close();                fs.Close();                MessageBox.Show("轉換成功!");            }            catch (Exception ex)            {                MessageBox.Show("ImgToBase64String 轉換失敗/nException:" + ex.Message);            }        }        //base64編碼的文本 轉為    圖片        private void button2_Click(object sender, EventArgs e)        {            OpenFileDialog dlg = new OpenFileDialog();            dlg.Title = "選擇要轉換的base64編碼的文本";            dlg.Filter = "txt files|*.txt";            if (DialogResult.OK == dlg.ShowDialog())            {                Base64StringToImage(dlg.FileName);            }        }        //base64編碼的文本 轉為    圖片        private void Base64StringToImage(string txtFileName)        {            try            {                FileStream ifs = new FileStream(txtFileName, FileMode.Open, FileAccess.Read);                StreamReader sr = new StreamReader(ifs);                String inputStr = sr.ReadToEnd();                byte[] arr = Convert.FromBase64String(inputStr);                MemoryStream ms = new MemoryStream(arr);                Bitmap bmp = new Bitmap(ms);                bmp.Save(txtFileName + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);                //bmp.Save(txtFileName + ".bmp", ImageFormat.Bmp);                //bmp.Save(txtFileName + ".gif", ImageFormat.Gif);                //bmp.Save(txtFileName + ".png", ImageFormat.Png);                ms.Close();                sr.Close();                ifs.Close();                this.pictureBox1.Image = bmp;                MessageBox.Show("轉換成功。");            }            catch (Exception ex)            {                MessageBox.Show("Base64StringToImage 轉換失敗/nException："+ex.Message);            }        }    }}