在vb中调用api操作注册表.txt

准确理解注册表的用途和功能

有时候我们需要读取某个Key下的所有名称的值，找到特定的或者全部名称的值以作它用，比如我在编写清除著名的"木马冰河" 服务器端程序时，就需要查找HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run下的所有可疑的加载程序项目然后删除之。

　　要用到的API函数的详细描述参看“注册表编程相关函数”一文。一个完整的例子如下：


'*************EnumVal2.bas***************

Option Explicit 
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 
Public Const HKEY_CURRENT_CONFIG = &H80000005 
Public Const HKEY_DYN_DATA = &H80000006 

Public Const REG_NONE = 0 
Public Const REG_SZ = 1 
Public Const REG_EXPAND_SZ = 2 
Public Const REG_BINARY = 3
Public Const REG_DWORD = 4 
Public Const REG_DWORD_BIG_ENDIAN = 5 
Public Const REG_MULTI_SZ = 7 
'注意以下的函数声明须在一行内写完
Declare Function RegOpenKey Lib "advapi32.dll" Alias "RegOpenKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long 

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 

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 

Declare Function RegEnumValue Lib "advapi32.dll" Alias "RegEnumValueA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpValueName As String, lpcbValueName As Long, lpReserved As Long, lpType As Long, lpData As Byte, lpcbData As Long) As Long 

Declare Function RegEnumValueAsAny Lib "advapi32.dll" Alias "RegEnumValueA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpValueName As String, lpcbValueName As Long, lpReserved As Long, lpType As Long, lpData As Any, lpcbData As Long) As Long 

Declare Function RegEnumValueAsAny2 Lib "advapi32.dll" Alias "RegEnumValueA" (ByVal hKey As Long, ByVal dwIndex As Long, lpValueName As Any, lpcbValueName As Long, lpReserved As Long, lpType As Long, lpData As Any, lpcbData As Long) As Long 

Declare Function ExpandEnvironmentStrings Lib "kernel32" Alias "ExpandEnvironmentStringsA" (ByVal lpSrc As String, ByVal lpDst As String, ByVal nSize As Long) As Long 

Sub MultiStringToStringArray(S As String, S2() As String)
'S为我们读取出来的多重字符串
'S2为转换后的字符串数组
Dim count As Integer, pos As Integer, pos2 As Integer, idx As Integer 
pos = InStr(S, Chr(0))

While pos > 0 count = count + 1 
pos = InStr(pos + 1, S, Chr(0)) 
Wend 
'取得多重字符串中的字符串个数
count = count - 1 

ReDim S2(0 To count - 1) 
pos = 1 
For idx = 0 To count - 1 
pos2 = InStr(pos, S, Chr(0)) 
S2(idx) = Mid(S, pos, pos2 - pos) 
pos = pos2 + 1 
Next 
End Sub

'在form中添加command按钮和text文本框

'************EnumVal2.frm****************

'以下的Command1_Click事件中我们将列举出'HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run下的所有name及其Value.
Private Sub Command1_Click() 
Dim hKey As Long, ret As Long, lenData As Long, typeData As Long Dim Name As String
Dim lenName As Long 
Dim idx As Integer, j As Integer Dim bName(256) As Byte 
ret = RegOpenKey(HKEY_LOCAL_MACHINE, "Software\Microsoft\Windows\CurrentVersion\Run", hKey) 
If ret <> 0 Then Exit Sub 

ret = 0 
idx = 0 
While ret = 0 
lenName = 256 

ret=RegEnumValueAsAny2(hKey,idx,bName(0),lenName,ByVal 0,typeData,ByVal vbNullString, lenData) 
If ret <> 0 Then 
RegCloseKey hKey 
Exit Sub 
End If 
'上面的RegEnumValueAsAny2调用得到了第一个Name的长度lenName,不含chr(0)
Name = String(lenName + 1, Chr(0)) 
lenName = Len(Name) 
Select Case typeData 
Case REG_SZ, REG_EXPAND_SZ, REG_MULTI_SZ 
Dim S As String 
S = String(lenData, Chr(0)) 
RegEnumValueAsAny hKey, idx, Name, lenName, ByVal 0, typeData, ByVal S, lenData 
If typeData = REG_SZ Then 
S = Left(S, InStr(S, Chr(0)) - 1) 
Text1.SelText=IIf(lenName=0, "(预设值)",Left(Name,InStr(Name,Chr(0))-1)) & "=" & S & vbCrLf 
ElseIf typeData = REG_EXPAND_SZ Then 
Dim S2 As String 
S2 = String(Len(S) + 256, Chr(0)) 
ExpandEnvironmentStrings S, S2, Len(S2) 
S = Left(S2, InStr(S2, Chr(0)) - 1) 
Text1.SelText = Left(Name, InStr(Name, Chr(0)) - 1) & " = " & S & vbCrLf 
ElseIf typeData = REG_MULTI_SZ Then 
Dim SArr() As String 
MultiStringToStringArray S, SArr 
For j = 0 To UBound(SArr) 
Text1.SelText = Left(Name, InStr(Name, Chr(0)) - 1) & "(" & j & ") = " & SArr(j) & vbCrLf 
Next 
End If 
Case REG_DWORD, REG_DWORD_BIG_ENDIAN 
Dim L As Long 
RegEnumValueAsAny hKey, idx, Name, lenName, ByVal 0, typeData, L, lenData 
Text1.SelText = Left(Name, InStr(Name, Chr(0)) - 1) & " = " & L & vbCrLf 
Case REG_BINARY 
ReDim bArr(0 To lenData - 1) As Byte 
RegEnumValueAsAny hKey, idx, Name, lenName, ByVal 0, typeData, bArr(0), lenData 
Text1.SelText = Left(Name, InStr(Name, Chr(0)) - 1) & " = " 
For j = 0 To UBound(bArr) 
Text1.SelText = Hex(bArr(j)) & " " 
Next 
Text1.SelText = vbCrLf 
End Select 
idx = idx + 1 
Wend 
RegCloseKey hKey 
End Sub