本文介绍了如何转换图像的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我没有一点长的错误我知道
我尝试过：
i dont some lenth error i dint understood
What I have tried:
Imports System.IO
Imports System.Text
Public Class Form1
Dim path As String = Directory.GetCurrentDirectory()
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
''First i choose a img to convert to byte
Dim img As Image = Image.FromFile("C:\Users\admin\Desktop\1550157567366_1-xlg400x400.jpg")
''Second i convertexd the image to byte
Dim bArr As Byte() = imgToByteArray(img)
''third i converted byte to string
Dim istring As String = Bytes_To_String2(bArr)
'just exported to a text file in same path folder
'----------------------------------
ExportTextFile(istring)
' Dim bArr2 As Byte() = stringToByteArray(istring)
'----------------------------------
'Step four back to back from string to byte
Dim bArr2 As Byte() = ToByteArray(istring)
'step five bytes to img last stage is confusion
Dim img1 As Image = byteArrayToImage(bArr2)
'dint no see any picture in the picturebox1
PictureBox1.Image = img1
End Sub
Public Function imgToByteArray(ByVal img As Image) As Byte()
'Fisrt step
Using mStream As New MemoryStream()
img.Save(mStream, img.RawFormat)
Return mStream.ToArray()
End Using
End Function
Private Function Bytes_To_String2(ByVal bytes_Input As Byte()) As String
'Second Step conversion of byte to sring
Dim strTemp As New StringBuilder(bytes_Input.Length * 2)
For Each b As Byte In bytes_Input
strTemp.Append(Conversion.Hex(b))
Next
MsgBox(strTemp.ToString())
Return strTemp.ToString()
End Function
Sub ExportTextFile(ByVal revokedlinks As String)
'thrid Step Convesion of string to text file
Dim RevokedTextFile As String = path & "\StringToTextFile.txt"
If File.Exists(RevokedTextFile) = True Then
Dim appendText As String = revokedlinks
File.AppendAllText(RevokedTextFile, appendText)
Dim readText As String = File.ReadAllText(RevokedTextFile)
End If
If File.Exists(RevokedTextFile) = False Then
Dim createText As String = revokedlinks
File.WriteAllText(RevokedTextFile, createText)
End If
End Sub
Public Function ToByteArray(ByVal someString As String) As Byte()
'step four
Dim byteList As New List(Of Byte)
Try
Dim tempString As String = someString.Replace("&H", "")
If tempString.Length Mod 2 = 1 Then tempString = "0" & tempString
For index As Integer = 0 To tempString.Length Step 2
byteList.Add(Convert.ToByte(Val("&H" & tempString.Substring(index, 2))))
Next
Catch ex As Exception
MessageBox.Show(ex.ToString)
End Try
Return byteList.ToArray
End Function
'convert bytearray to image
Public Function byteArrayToImage(ByVal byteArrayIn As Byte()) As Image
'step 5 dint work
Using mStream As New MemoryStream(byteArrayIn)
Return Image.FromStream(mStream)
End Using
End Function
End Class推荐答案
Imports System.IO
Public Class Form1
Dim path As String = Directory.GetCurrentDirectory()
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'Dim img As Image = Image.FromFile("C:\Users\admin\Desktop\1550157567366_1-xlg400x400.jpg")
Dim istring As String = ConvertFileToBase64("C:\Users\admin\Desktop\1550157567366_1-xlg400x400.jpg")
ExportTextFile(istring)
End Sub
Public Function ConvertFileToBase64(ByVal fileName As String) As String
Dim ReturnValue As String = ""
If My.Computer.FileSystem.FileExists(fileName) Then
Using BinaryFile As FileStream = New FileStream(fileName, FileMode.Open)
Dim BinRead As BinaryReader = New BinaryReader(BinaryFile)
Dim BinBytes As Byte() = BinRead.ReadBytes(CInt(BinaryFile.Length))
ReturnValue = Convert.ToBase64String(BinBytes)
BinaryFile.Close()
End Using
End If
Return ReturnValue
End Function
Sub ExportTextFile(ByVal revokedlinks As String)
'thrid Step Convesion of string to text file
Dim RevokedTextFile As String = Path & "\StringToTextFile.txt"
If File.Exists(RevokedTextFile) = True Then
Dim appendText As String = revokedlinks
File.AppendAllText(RevokedTextFile, appendText)
Dim readText As String = File.ReadAllText(RevokedTextFile)
End If
If File.Exists(RevokedTextFile) = False Then
Dim createText As String = revokedlinks
File.WriteAllText(RevokedTextFile, createText)
End If
End Sub
End Class
Imports System.IO
Public Class Form1
Dim path As String = Directory.GetCurrentDirectory()
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
'Dim img As Image = Image.FromFile("C:\Users\admin\Desktop\1550157567366_1-xlg400x400.jpg")
Dim istring As String = ConvertFileToBase64("C:\Users\admin\Desktop\1550157567366_1-xlg400x400.jpg")
ExportTextFile(istring)
Dim b As Byte() = Convert.FromBase64String(istring)
Dim img1 As Image = byteArrayToImage(b)
PictureBox1.Image = img1
End Sub
Public Function byteArrayToImage(ByVal byteArrayIn As Byte()) As Image
'step 5 dint work
Using mStream As New MemoryStream(byteArrayIn)
Return Image.FromStream(mStream)
End Using
End Function
Public Function ConvertFileToBase64(ByVal fileName As String) As String
Dim ReturnValue As String = ""
If My.Computer.FileSystem.FileExists(fileName) Then
Using BinaryFile As FileStream = New FileStream(fileName, FileMode.Open)
Dim BinRead As BinaryReader = New BinaryReader(BinaryFile)
Dim BinBytes As Byte() = BinRead.ReadBytes(CInt(BinaryFile.Length))
ReturnValue = Convert.ToBase64String(BinBytes)
BinaryFile.Close()
End Using
End If
Return ReturnValue
End Function
Sub ExportTextFile(ByVal revokedlinks As String)
'thrid Step Convesion of string to text file
Dim RevokedTextFile As String = Path & "\StringToTextFile.txt"
If File.Exists(RevokedTextFile) = True Then
Dim appendText As String = revokedlinks
File.AppendAllText(RevokedTextFile, appendText)
Dim readText As String = File.ReadAllText(RevokedTextFile)
End If
If File.Exists(RevokedTextFile) = False Then
Dim createText As String = revokedlinks
File.WriteAllText(RevokedTextFile, createText)
End If
End Sub
End Class
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