Mientras tengo un pequeño descanso voy a escribir este articulo que un amigo me pregunto como podia dibujar figuras con el mouse en visual basic.net, asi que aqui les dejo este codigo con el cual pueden dibujar rectangulos con el mouse y de ahi pueden hacer muchas cosas mas.
‘Creamos nuestro rectangulo
Dim SelectRect As Rectangle = New Rectangle()
‘Nuestros puntos que nos ayudaran para el dibujo del rectangulo
Dim ps As Point = New Point()
Dim pe As Point = New Point()
Private Sub Form1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseDown
‘Obtenemos las cordenadas del puntero del mouse
SelectRect.Width = 0
SelectRect.Height = 0
SelectRect.X = e.X
SelectRect.Y = e.Y
ps.X = e.X
ps.Y = e.Y
pe = ps
End Sub
Private Sub Form1_MouseMove(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseMove
‘Si se activa el Boton izquierdo del mouse
If (e.Button = Windows.Forms.MouseButtons.Left) Then
‘Dibujamos el rectangulo
ControlPaint.DrawReversibleFrame(Me.RectangleToScreen(SelectRect), Color.Black, FrameStyle.Dashed)
SelectRect.Width = e.X – SelectRect.X
SelectRect.Height = e.Y – SelectRect.Y
ControlPaint.DrawReversibleFrame(Me.RectangleToScreen(SelectRect), Color.Black, FrameStyle.Dashed)
End If
End Sub
Private Sub Form1_MouseUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles MyBase.MouseUp
Dim g As Graphics = Me.CreateGraphics()
Dim p As Pen = New Pen(Color.Blue, 2)
ControlPaint.DrawReversibleFrame(Me.RectangleToScreen(SelectRect), Color.Black, FrameStyle.Dashed)
g.DrawRectangle(p, SelectRect)
g.Dispose()
End Sub
Encriptar Querystring
Lo que hace este pequeño codigo es encriptar el querystring de una URL,bueno espero que les sea util este articulo.
Imports System
Imports System.IO
Imports System.Xml
Imports System.Text
Imports System.Security.Cryptography
Public Class Encryption64
Private key() As Byte = {}
Private IV() As Byte = {&H12, &H34, &H56, &H78, &H90, &HAB, &HCD, &HEF}
Public Function Decrypt(ByVal stringToDecrypt As String, _
ByVal sEncryptionKey As String) As String
Dim inputByteArray(stringToDecrypt.Length) As Byte
Try
key = System.Text.Encoding.UTF8.GetBytes(Left(sEncryptionKey, 8))
Dim des As New DESCryptoServiceProvider()
inputByteArray = Convert.FromBase64String(stringToDecrypt)
Dim ms As New MemoryStream()
Dim cs As New CryptoStream(ms, des.CreateDecryptor(key, IV), _
CryptoStreamMode.Write)
cs.Write(inputByteArray, 0, inputByteArray.Length)
cs.FlushFinalBlock()
Dim encoding As System.Text.Encoding = System.Text.Encoding.UTF8
Return encoding.GetString(ms.ToArray())
Catch e As Exception
Return e.Message
End Try
End Function
Public Function Encrypt(ByVal stringToEncrypt As String, _
ByVal SEncryptionKey As String) As String
Try
key = System.Text.Encoding.UTF8.GetBytes(Left(SEncryptionKey, 8))
Dim des As New DESCryptoServiceProvider()
Dim inputByteArray() As Byte = Encoding.UTF8.GetBytes( _
stringToEncrypt)
Dim ms As New MemoryStream()
Dim cs As New CryptoStream(ms, des.CreateEncryptor(key, IV), _
CryptoStreamMode.Write)
cs.Write(inputByteArray, 0, inputByteArray.Length)
cs.FlushFinalBlock()
Return Convert.ToBase64String(ms.ToArray())
Catch e As Exception
Return e.Message
End Try
End Function
End Class
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