This is a little more difficult.
Code:
Public Class Form1
Private Shared Function HexStringToByteArray(ByRef strInput As String)
As Byte()
Dim length As Integer
Dim bOutput As Byte()
Dim c(1) As Integer
length = strInput.Length / 2
ReDim bOutput(length - 1)
For i As Integer = 0 To (length - 1)
For j As Integer = 0 To 1
c(j) = Asc(strInput.Chars(i * 2 + j))
If ((c(j) >= Asc("0")) And (c(j) <= Asc("9"))) Then
c(j) = c(j) - Asc("0")
ElseIf ((c(j) >= Asc("A")) And (c(j) <= Asc("F"))) Then
c(j) = c(j) - Asc("A") + &HA
ElseIf ((c(j) >= Asc("a")) And (c(j) <= Asc("f"))) Then
c(j) = c(j) - Asc("a") + &HA
End If
Next j
bOutput(i) = (c(0) * &H10 + c(1))
Next i
Return (bOutput)
End Function
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim myFile As String = "..\..\Test.jpg"
Dim myBytes As Byte() =
My.Computer.FileSystem.ReadAllBytes(myFile)
Dim txtTemp As New System.Text.StringBuilder()
For Each myByte As Byte In myBytes
txtTemp.Append(myByte.ToString("X2"))
Next
RichTextBox1.Text = txtTemp.ToString()
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button2.Click
Dim myFile As String = "..\..\Test2.jpg"
Dim myBytes As Byte() = HexStringToByteArray(RichTextBox1.Text)
My.Computer.FileSystem.WriteAllBytes(myFile, myBytes, False)
End Sub
End Class
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