C#中图片与BASE64码互相转换

1 //图片 转为    base64编码的文本
2         private void button1_Click(objectsender, EventArgs e)
3 {
4             OpenFileDialog dlg = newOpenFileDialog();
5             dlg.Multiselect = true;
6             dlg.Title = "选择要转换的图片";
7             dlg.Filter = "Image files (*.jpg;*.bmp;*.gif;*.png)|*.jpg*.jpeg;*.gif;*.bmp|AllFiles (*.*)|*.*";
8             if (DialogResult.OK ==dlg.ShowDialog())
9 {
10                 for (int i = 0; i < dlg.FileNames.Length; i++)
11 {
12 ImgToBase64String(dlg.FileNames[i].ToString());
13 }
14 }
15 }
16         //图片 转为    base64编码的文本
17         private void ImgToBase64String(stringImagefilename)
18 {
19             try
20 {
21                 Bitmap bmp = newBitmap(Imagefilename);
22                 this.pictureBox1.Image =bmp;
23                 FileStream fs = new FileStream(Imagefilename + ".txt", FileMode.Create);
24                 StreamWriter sw = newStreamWriter(fs);
25 
26                 MemoryStream ms = newMemoryStream();
27 bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
28                 byte[] arr = new byte[ms.Length];
29                 ms.Position = 0;
30                 ms.Read(arr, 0, (int)ms.Length);
31 ms.Close();
32                 String strbaser64 =Convert.ToBase64String(arr);
33 sw.Write(strbaser64);
34 
35 sw.Close();
36 fs.Close();
37                //MessageBox.Show("转换成功!");
38 }
39             catch(Exception ex)
40 {
41                 MessageBox.Show("ImgToBase64String 转换失败
Exception:" +ex.Message);
42 }
43 }
44 
45         //base64编码的文本 转为    图片
46         private void button2_Click(objectsender, EventArgs e)
47 {
48             OpenFileDialog dlg = newOpenFileDialog();
49             dlg.Multiselect = true;
50             dlg.Title = "选择要转换的base64编码的文本";
51             dlg.Filter = "txt files|*.txt";
52             if (DialogResult.OK ==dlg.ShowDialog())
53 {
54                 for (int i = 0; i < dlg.FileNames.Length; i++)
55 {
56 Base64StringToImage(dlg.FileNames[i].ToString());
57 }
58                 
59 }
60 }
61         //base64编码的文本 转为    图片
62         private void Base64StringToImage(stringtxtFileName)
63 {
64             try
65 {
66                 FileStream ifs = newFileStream(txtFileName, FileMode.Open, FileAccess.Read);
67                 StreamReader sr = newStreamReader(ifs);
68 
69                 String inputStr =sr.ReadToEnd();
70                 byte[] arr =Convert.FromBase64String(inputStr);
71                 MemoryStream ms = newMemoryStream(arr);
72                 Bitmap bmp = newBitmap(ms);
73 
74                 //bmp.Save(txtFileName + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
75                 //bmp.Save(txtFileName + ".bmp", ImageFormat.Bmp);
76                 //bmp.Save(txtFileName + ".gif", ImageFormat.Gif);
77                 //bmp.Save(txtFileName + ".png", ImageFormat.Png);
78 ms.Close();
79 sr.Close();
80 ifs.Close();
81                 this.pictureBox2.Image =bmp;
82                 if(File.Exists(txtFileName))
83 {
84 File.Delete(txtFileName);
85 }
86                 //MessageBox.Show("转换成功！");
87 }
88             catch(Exception ex)
89 {
90                 MessageBox.Show("Base64StringToImage 转换失败
Exception：" +ex.Message);
91 }
92         }