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VB.net菜单:项目 --> XXX 属性... --> 配置 --> 优化 --> 选中“移除整数溢出检查”复选框
下面来仔细研究一下VB.NET中文验证码的相关代码编写:
- Function RndStr()Function 
 RndStr() As String
- Dim gb As SystemSystem.Text. 
 Encoding = System.Text.Encoding.
 GetEncoding("gb2312")
- Dim bytes As Object() = 
 CreateRegionCode(4)
- Dim str1 As String = gb.GetString 
 (DirectCast(Convert.ChangeType
 (bytes(0), GetType(Byte())), Byte()))
- Dim str2 As String = gb.GetString 
 (DirectCast(Convert.ChangeType
 (bytes(1), GetType(Byte())), Byte()))
- Dim str3 As String = gb.GetString 
 (DirectCast(Convert.ChangeType
 (bytes(2), GetType(Byte())), Byte()))
- Dim str4 As String = gb.GetString 
 (DirectCast(Convert.ChangeType
 (bytes(3), GetType(Byte())), Byte()))
- Dim txt As String = (str1 & 
 str2 & str3 & str4)
- End Function 
- Function CreateRegionCode()Function 
 CreateRegionCode(ByVal strlength
 As Integer) As Object()
- Dim rBase As String() = New String() 
 {"0", "1", "2", "3", "4", "5",
 "6", "7", "8", "9", "a", "b",
 "c", "d", "e", "f"}
- Dim rnd As New Random 
- Dim bytes As Object() = New 
 Object(strlength - 1) {}
- Dim i As Integer = 0 
- Do While (i < strlength) 
- Dim r2 As Integer 
- Dim r4 As Integer 
- Dim r1 As Integer = rnd.Next(11, 14) 
- Dim str_r1 As String = rBase(r1).Trim 
- rnd = New Random(r1 * DateTime. 
 Now.Ticks + i)
- If (r1 = 13) Then 
- r2 = rnd.Next(0, 7) 
- Else 
- r2 = rnd.Next(0, &H10) 
- End If 
- Dim str_r2 As String = rBase(r2).Trim 
- Dim r3 As Integer = New Random( 
 (r2 * DateTime.Now.Ticks) + i).
 Next(10, &H10)
- Dim str_r3 As String = rBase(r3).Trim 
- rnd = New Random((r3 * DateTime. 
 Now.Ticks) + i)
- Select Case r3 
- Case 10 
- r4 = rnd.Next(1, &H10) 
- Exit Select 
- Case 15 
- r4 = rnd.Next(0, 15) 
- Exit Select 
- Case Else 
- r4 = rnd.Next(0, &H10) 
- Exit Select 
- End Select 
- Dim str_r4 As String = rBase(r4).Trim 
- Dim byte1 As Byte = Convert. 
 ToByte((str_r1 & str_r2), &H10)
- Dim byte2 As Byte = Convert. 
 ToByte((str_r3 & str_r4), &H10)
- Dim str_r As Byte() = New Byte() 
 {byte1, byte2}
- bytes.SetValue(str_r, i) 
- i += 1 
- Loop 
- Return bytes 
- End Function 
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