为您的应用程序加上注册的局限

  为您的应用程序加上注册的限制是不是很好，至少现在的共享软件都是这样做的。 大家都用过Winzip这个软件吧！当未注册时每次启动都会弹出个该死的对话框，只有正确的注册后此对话框才会消失。这就是我们本次所要实现的目标。对于这些信息我们将其存储在注册表中VB6.0提供了一个函数及一条语句用于读写注册表它们是GetSetting 和 SaveSetting 遗憾的是我们不能用它将键值 写在注册表的任意位置。难道就没有别的函数了吗？NO！有！那就是Micro$oft的Win32 API 它所提供的 函数可以让我们随意的读写注册表的任何位置包括新建键值、删除键值、新建项目等等……。废话就不多 说了我们还是先来看看如何实现吧！

以下控件使用默认名称请不要改变。
1、新建两个窗体。
2、在第一个窗体(Form1)上放置两个文本框及两个按钮。
3、在第二个窗体(Form2)上放置5个标签
4、新建一个标准模块
您现在可以将代码粘贴过去运行了。

模块的代码
Option Explicit
' 这个模块用于读和写注册表关键字。
' 不同于VB 的内部注册表访问方法，它可以
' 通过字符串的值来读和写任何注册表关键字。
'---------------------------------------------------------------
'-注册表 API 声明...
'RegCloseKey 用于关闭系统注册表中的一个项（或键）
'RegCreateKeyEx用于创建注册表项
'RegOpenKeyEx用于打开注册表项
'RegQueryValueEx 用于获取一个项的设置值
'RegSetValueEx 用于设置指定项的值
'---------------------------------------------------------------
Public Declare Function RegCloseKey Lib "advapi32" (ByVal hkey As Long) As Long
Public Declare Function RegCreateKeyEx Lib "advapi32" Alias "RegCreateKeyExA" (ByVal hkey As Long, ByVal lpSubKey As String, ByVal Reserved As Long, ByVal lpClass As String, ByVal dwOptions As Long, ByVal samDesired As Long, ByRef lpSecurityAttributes As SECURITY_ATTRIBUTES, ByRef phkResult As Long, ByRef lpdwDisposition As Long) As Long
Public Declare Function RegOpenKeyEx Lib "advapi32" Alias "RegOpenKeyExA" (ByVal hkey As Long, ByVal lpSubKey As String, ByVal ulOptions As Long, ByVal samDesired As Long, ByRef phkResult As Long) As Long
Public Declare Function RegQueryValueEx Lib "advapi32" Alias "RegQueryValueExA" (ByVal hkey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, ByRef lpType As Long, ByVal lpData As String, ByRef lpcbData As Long) As Long
Public Declare Function RegSetValueEx Lib "advapi32" Alias "RegSetValueExA" (ByVal hkey As Long, ByVal lpValueName As String, ByVal Reserved As Long, ByVal dwType As Long, ByVal lpData As String, ByVal cbData As Long) As Long
'---------------------------------------------------------------
'- 注册表 Api 常数...
'---------------------------------------------------------------
' Reg Data Types...
Public Const REG_SZ = 1 ' Unicode空终结字符串
Public Const REG_EXPAND_SZ = 2' Unicode空终结字符串
Public Const REG_DWORD = 4' 32-bit 数字
Public Const REG_BINARY = 3
' 注册表创建类型值...
Public Const REG_OPTION_NON_VOLATILE = 0 ' 当系统重新启动时，关键字被保留
' 注册表关键字安全选项...
Public Const READ_CONTROL = &H20000
Public Const KEY_QUERY_VALUE = &H1
Public Const KEY_SET_VALUE = &H2
Public Const KEY_CREATE_SUB_KEY = &H4
Public Const KEY_ENUMERATE_SUB_KEYS = &H8
Public Const KEY_NOTIFY = &H10
Public Const KEY_CREATE_LINK = &H20
Public Const KEY_READ = KEY_QUERY_VALUE + KEY_ENUMERATE_SUB_KEYS + KEY_NOTIFY + READ_CONTROL
Public Const KEY_WRITE = KEY_SET_VALUE + KEY_CREATE_SUB_KEY + READ_CONTROL
Public Const KEY_EXECUTE = KEY_READ
Public Const KEY_ALL_ACCESS = KEY_QUERY_VALUE + KEY_SET_VALUE + _
KEY_CREATE_SUB_KEY + KEY_ENUMERATE_SUB_KEYS + _
KEY_NOTIFY + KEY_CREATE_LINK + READ_CONTROL

' 注册表关键字根类型...
Public Const HKEY_CLASSES_ROOT = &H80000000
Public Const HKEY_CURRENT_USER = &H80000001
Public Const HKEY_LOCAL_MACHINE = &H80000002
Public Const HKEY_USERS = &H80000003
Public Const HKEY_PERFORMANCE_DATA = &H80000004

' 返回值...
Public Const ERROR_NONE = 0
Public Const ERROR_BADKEY = 2
Public Const ERROR_ACCESS_DENIED = 8
Public Const ERROR_SUCCESS = 0

'---------------------------------------------------------------
'- 注册表安全属性类型...
'---------------------------------------------------------------
Private Type SECURITY_ATTRIBUTES
nLength As Long
lpSecurityDescriptor As Long
bInheritHandle As Boolean
End Type
'-------------------------------------------------------------------------------------------------
'本函数在注册表中创建新的项及键值
'sample usage - Debug.Print UpodateKey(HKEY_CLASSES_ROOT, "keyname", "newvalue")
'-------------------------------------------------------------------------------------------------
Public Function UpdateKey(KeyRoot As Long, KeyName As String, SubKeyName As String, SubReg As Long, SubKeyValue As String, IngNumber As Long) As Long
Dim rc As Long' 返回代码
Dim hkey As Long' 处理一个注册表关键字
Dim hDepth As Long'
Dim lpAttr As SECURITY_ATTRIBUTES ' 注册表安全类型
lpAttr.nLength = 50 ' 设置安全属性为缺省值...
lpAttr.lpSecurityDescriptor = 0 ' ...
lpAttr.bInheritHandle = True' ...
'------------------------------------------------------------
'- 创建/打开注册表关键字...
'创建/打开//KeyRoot//KeyName
' 错误处理...
'------------------------------------------------------------
rc = RegCreateKeyEx(KeyRoot, KeyName, 0, "", 0, KEY_WRITE, lpAttr, hkey, hDepth)
If (rc <> ERROR_SUCCESS) Then GoTo CreateKeyError
'------------------------------------------------------------
'- 创建/修改关键字值...
' 要让RegSetValueEx() 工作需要输入一个空格...
' 创建/修改关键字值
'- 关闭注册表关键字...
'------------------------------------------------------------
Select Case SubReg
Case REG_SZ
rc = RegSetValueEx(hkey, SubKeyName, 0, SubReg, SubKeyValue, IngNumber)
If (rc <> ERROR_SUCCESS) Then GoTo CreateKeyError
End Select
rc = RegCloseKey(hkey)' 退出
Exit Function ' 错误处理
CreateKeyError:
UpdateKey = False ' 设置错误返回代码
rc = RegCloseKey(hkey)' 试图关闭关键字
End Function

'-------------------------------------------------------------------------------------------------
'本函数在注册表中读取键值
'sample usage - Debug.Print GetKeyValue(HKEY_CLASSES_ROOT, "COMCTL.ListviewCtrl.1\CLSID", "")
'-------------------------------------------------------------------------------------------------
Public Function GetKeyValue(KeyRoot As Long, KeyName As String, SubKeyRef As String) As String
Dim I As Long ' 循环计数器
Dim rc As Long' 返回代码
Dim hkey As Long' 处理打开的注册表关键字
Dim hDepth As Long'
Dim sKeyVal As String
Dim lKeyValType As Long ' 注册表关键字数据类型
Dim tmpVal As String' 注册表关键字的临时存储器
Dim KeyValSize As Long' 注册表关键字变量尺寸
' 在 KeyRoot {HKEY_LOCAL_MACHINE...} 下打开注册表关键字
'------------------------------------------------------------
rc = RegOpenKeyEx(KeyRoot, KeyName, 0, KEY_ALL_ACCESS, hkey) ' 打开注册表关键字
If (rc <> ERROR_SUCCESS) Then GoTo GetKeyError' 处理错误...
tmpVal = String$(1024, 0) ' 分配变量空间
KeyValSize = 1024 ' 标记变量尺寸
'------------------------------------------------------------
' 检索注册表关键字的值...
'------------------------------------------------------------
rc = RegQueryValueEx(hkey, SubKeyRef, 0, _
lKeyValType, tmpVal, KeyValSize)' 获得/创建关键字的值
If (rc <> ERROR_SUCCESS) Then GoTo GetKeyError ' 错误处理
tmpVal = Left$(tmpVal, InStr(tmpVal, Chr(0)) - 1)
'------------------------------------------------------------
' 决定关键字值的转换类型...
'------------------------------------------------------------
Select Case lKeyValType ' 搜索数据类型...
Case REG_SZ, REG_EXPAND_SZ' 字符串注册表关键字数据类型
sKeyVal = tmpVal' 复制字符串的值
Case REG_DWORD' 四字节注册表关键字数据类型
For I = Len(tmpVal) To 1 Step -1' 转换每一位
sKeyVal = sKeyVal + Hex(Asc(Mid(tmpVal, I, 1))) ' 一个字符一个字符地生成值。
Next
sKeyVal = Format$("&h" + sKeyVal) ' 转换四字节为字符串
End Select

GetKeyValue = sKeyVal ' 返回值
rc = RegCloseKey(hkey)' 关闭注册表关键字
Exit Function ' 退出
GetKeyError:' 错误发生过后进行清除...
GetKeyValue = vbNullString' 设置返回值为空字符串
rc = RegCloseKey(hkey)' 关闭注册表关键字
End Function

窗体1（Form1）的代码
Private Sub Command1_Click()
Dim password As String
If Text2.Text = "19811127" Then
UpdateKey HKEY_LOCAL_MACHINE, "software\编程浪子", "姓名", REG_SZ, Text1.Text, LenB(Text1.Text)
UpdateKey HKEY_LOCAL_MACHINE, "software\编程浪子", "注册密码", REG_SZ, Text2.Text, 8
MsgBox "感谢您对我们编程浪子的支持,请访问我们的网站。" & vbCrLf & "Http://vbchina.chinahot.com", vbOKOnly + vbInformation, "谢谢，编程浪子欢迎您"
Form2.Show
Unload Me
Else
MsgBox "抱歉！注册密码错误，请访问Http://vbchina.chinahot.com获得注册码！。", vbOKOnly + vbExclamation, "注册出错"
Text2.SetFocus
Text2.SelStart = 0
Text2.SelLength = Len(Text2.Text)
End If
End Sub

Private Sub Command2_Click()
Form2.Show
Unload Me
End Sub

Private Sub Form_Load()
Command1.Caption = "确定"
Command2.Caption = "试用"
Dim password As String
password = GetKeyValue(HKEY_LOCAL_MACHINE, "software\编程浪子", "注册密码")
If password = "198119811127" Then
Form2.Show
Unload Me
End If
End Sub

窗体2（Form2）的代码
Private Sub Form_Load()
Dim password As String, Name As String
password = GetKeyValue(HKEY_LOCAL_MACHINE, "software\编程浪子", "注册密码")
Name = GetKeyValue(HKEY_LOCAL_MACHINE, "software\编程浪子", "姓名")
If password = "198119811127" Then
Label1.Caption = "这里是您的注册信息："
Label2.Caption = "本软件注册给"
Label3.Caption = "姓名：" & Name
Label4.Caption = "公司：" & Corp
Label5.Caption = "注册密码：" & password
Else
Label1.Caption = "未注册"
Label2.Caption = "本软件注册给"
Label3.Caption = "姓名：江建"
Label4.Caption = "公司：编程浪子"
Label5.Caption = "注册密码：Http://vbchina.chinahot.com"
End If
End Sub