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你希望你的程序能访问 Windows 注册表吗？当然，能访问庞大的 Windows 注册表是每个程序设计者都希望的事情，那么我就告诉你如何通过API函数访问 Windows 注册表吧。请先看看下面的 Visual Basic 程序：
'根键常数
Const HKEY_CLASSES_ROOT = -2147483648#
Const HKEY_CURRENT_USER = -2147483647#
Const HKEY_LOCAL_MACHINE = -2147483646#
Const HKEY_USERS = -2147483645#
'键值类型
Const REG_SZ = 1& '字符串值
Const REG_BINARY = 3& '二进制值
Const REG_DWORD = 4& 'DWORD 值
'声明有关API函数
Private Declare Function RegCreateKey Lib "advapi32.dll" Alias "RegCreateKeyA" _
( _
ByVal hKey As Long, _
ByVal lpSubKey As String, _
ByRef phkResult As Long _
) As Long '建立一个新的主键
Private Declare Function RegOpenKey Lib "advapi32.dll" Alias "RegOpenKeyA" _
( _
ByVal hKey As Long, _
ByVal lpSubKey As String, _
ByRef phkResult As Long _
) As Long '打开一个主键
Private Declare Function RegDeleteKey Lib "advapi32.dll" Alias "RegDeleteKeyA" _
( _
ByVal hKey As Long, _
ByVal lpSubKey As String _
) As Long '删除一个主键
Private Declare Function RegCloseKey Lib "advapi32.dll" _
( _
ByVal hKey As Long _
) As Long '关闭一个主键
Private Declare Function RegSetValueEx Lib "advapi32.dll" Alias "RegSetValueExA" _
( _
ByVal hKey As Long, _
ByVal lpValueName As String, _
ByVal Reserved As Long, _
ByVal dwType As Long, _
ByVal lpData As Any, _
ByVal cbData As Long _
) As Long '创建或改变一个键值,lpData应由缺省的ByRef型改为ByVal型
Private Declare Function RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" _
( _
ByVal hKey As Long, _
ByVal lpValueName As String, _
ByVal lpReserved As Long, _
ByRef lpType As Long, _
ByVal lpData As Any, _
ByRef lpcbData As Long _
) As Long '查询一个键值,lpData应由缺省的ByRef型改为ByVal型
Private Declare Function RegDeleteValue Lib "advapi32.dll" Alias "RegDeleteValueA" _
( _
ByVal hKey As Long, _
ByVal lpValueName As String _
) As Long '删除一个键值
'主过程
Sub Main()
Dim nKeyHandle As Long, nValueType As Long, nLength As Long
Dim sValue As String
sValue = "I am a winner!"
Call RegCreateKey(HKEY_CURRENT_USER, "New Registry Key", nKeyHandle)
Call RegSetValueEx(nKeyHandle, "My Value", 0, REG_SZ, sValue, 255)
sValue = Space(255)
nLength = 255
Call RegQueryValueEx(nKeyHandle, "My Value", 0, nValueType, sValue, nLength)
MsgBox sValue
Call RegDeleteValue(nKeyHandle, "My Value")
Call RegDeleteKey(HKEY_CURRENT_USER, "New Registry Key")
Call RegCloseKey(nKeyHandle)
End Sub
来看看程序运行的结果：
在注册表的 HKEY_CURRENT_USER 根键中多了一个 New Registry Key 主键。其中除有一个空的“(默认)”值外，还有一个值为“I am a winner!”的“My Value”值。
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