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Private Const HKEY_CURRENT_USER = &H80000001
Private Const HKEY_LOCAL_MACHINE = &H80000002
Private Const HKEY_USERS = &H80000003
Private Const HKEY_PERFORMANCE_DATA = &H80000004
Private Const HKEY_CURRENT_CONFIG = &H80000005
Private Const HKEY_DYN_DATA = &H80000006
Private Declare Function RegOpenKey Lib "advapi32.dll" Alias "RegOpenKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Private Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Private Declare Function RegCreateKey Lib "advapi32.dll" Alias "RegCreateKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Private Declare Function RegQueryValue Lib "advapi32.dll" Alias "RegQueryValueA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal lpValue As String, lpcbValue As Long) As Long
Private Const ERROR_MORE_DATA = 234
Private Declare Function RegSetValue Lib "advapi32.dll" Alias "RegSetValueA" (ByVal hKey As Long, ByVal lpSubKey As String, ByVal dwType As Long, ByVal lpData As String, ByVal cbData As Long) As Long
Enum ValueType
REG_NONE = 0
REG_SZ = 1
REG_EXPAND_SZ = 2
REG_BINARY = 3
REG_DWORD = 4
REG_DWORD_BIG_ENDIAN = 5
REG_MULTI_SZ = 7
End Enum
Private Declare Function RegQueryValueEx Lib "advapi32.dll" Alias "RegQueryValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal lpReserved As Long, lpType As Long, lpData As Any, lpcbData As Long) As Long
Private Sub Command1_Click()
Dim hKey As Long, ret As Long, lenData As Long, typeData As Long
Dim Name As String
Dim s As String
'读取HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Run的internat.exe的value.
Name = "abc" '想要查询的值，自己定
ret = RegOpenKey(HKEY_LOCAL_MACHINE, "Software/Microsoft/Windows/CurrentVersion/Run", hKey)
If ret = 0 Then
ret = RegQueryValueEx(hKey, Name, 0, typeData, ByVal vbNullString, lenData)
End If
s = String(lenData, Chr(0))
ret = RegQueryValueEx(hKey, Name, 0, typeData, ByVal s, lenData)
s = Left(s, InStr(s, Chr(0)) - 1)
MsgBox s
End Sub
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该段代码可以直接运行，唯独存在个问题 ，若找不到对应的值。则会出错退出。大家用时可以加个异常处理即可。如在ret = RegOpenKey(HKEY_LOCAL_MACHINE, "Software/Microsoft/Windows/CurrentVersion/Run", hKey) 后面加上On Error Resume Next 或 On Error GoTo XX，具体异常处理方法可以参见本博客VB分类里的VB程序错误处理方法小结 http://blog.csdn.net/chongan_wang/archive/2009/01/20/3839127.aspx。 | 
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