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暗号化と復号化を複数のテキストファイルや画像ファイルの暗号化と復号化に:どのように次のコードは動作します使用して、単一の.txtファイル用のフォルダ内
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles SelectFile.Click
'Create a File Dialog Box to select the source file
Dim dlg As New OpenFileDialog
'If OK Button is Click then add file name with path to textBox1
If dlg.ShowDialog() = DialogResult.OK Then
TextBox1.Text = dlg.FileName
End If
End Sub
Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Encrypt.Click
Dim outputFile As String
outputFile = "M:\Encryptions\Encrypted.txt"
Dim fsInput As New FileStream(TextBox1.Text, FileMode.Open, FileAccess.Read)
Dim fsEncrypted As New FileStream(outputFile, FileMode.Create, FileAccess.Write)
Dim sKey As String
sKey = "Helloabc"
Dim DES As New DESCryptoServiceProvider
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey)
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey)
Dim desencrypt As ICryptoTransform
desencrypt = DES.CreateEncryptor()
Dim cryptostream As New CryptoStream(fsEncrypted, desencrypt, CryptoStreamMode.Write)
Dim bytearrayinput(fsInput.Length) As Byte
fsInput.Read(bytearrayinput, 0, bytearrayinput.Length)
cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length)
cryptostream.Close()
fsInput.Close()
fsEncrypted.Close()
TextBox2.Text = "M:\Encryptions\Encrypted.txt"
End Sub
Private Sub Button3_Click(sender As System.Object, e As System.EventArgs) Handles Decrypt.Click
Dim DES As New DESCryptoServiceProvider
Dim sKey As String
sKey = "Helloabc"
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey)
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey)
Dim fsread As New FileStream(TextBox2.Text, FileMode.Open, FileAccess.Read)
Dim desdecrypt As ICryptoTransform
desdecrypt = DES.CreateDecryptor()
Dim cryptostreamDecr As New CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read)
Dim fsDecrypted As New StreamWriter("M:\Decryptions\Decrypted.txt")
fsDecrypted.Write(New StreamReader(cryptostreamDecr).ReadToEnd())
fsDecrypted.Flush()
fsDecrypted.Close()
TextBox3.Text = "M:\Decryptions\Decrypted.txt"
End Sub
しかし、複数のファイルを暗号化/復号化するために、元の出力をしようとすると、暗号化/復号化ファイル( "Encrypted.txt")は新しい出力に置き換えられます。
ファイル名が異なる複数の暗号化ファイルを作成するにはどうすればループを作成できますか?