data14.dat

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加密文件

本例介绍如何加密文件。

Private Sub CodedFile(InputFile As String, OutputFile As String, PasswordKey As Integer)
    Dim Char As String * 1
    '打开要加密/解密的文件
    Open InputFile For Binary As #1
    '打开加密/解密后生成的文件
    Open OutputFile For Binary As #2
    For z = 1 To FileLen(InputFile)
        '读取文件中的字符
        Get 1, , Char
        '与密钥进行异或运算
        Char = Chr$((Asc(Char) Xor PasswordKey))
        '将运算结果写入文件
        Put 2, , Char
    Next z
    '关闭文件
    Close #1
    Close #2
End Sub

Private Sub Command1_Click()
    Dim InputFile As String
    Dim OutputFile As String
    Dim PasswordKey As Integer
    InputFile = InputBox("输入要加密/解密的文件名", "加密/解密")
    OutputFile = InputBox("输入加密/解密后的文件名", "加密 / 解密到")
    PasswordKey = InputBox("输入密钥（整数）", "输入密钥")
    Call CodedFile(InputFile, OutputFile, PasswordKey)
    MsgBox "文件已加密/解密到： " + OutputFile, , "完成"
    End
End Sub