在VB中調用API操作注冊表
有時候我們需要讀取某個Key下的所有名稱的值，找到特定的或者全部名稱的值以作它用，比如我在編寫清除著名的"木馬冰河" 服務器端程序時，就需要查找HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun下的所有可疑的加載程序項目然后刪除之。
要用到的API函數的詳細描述參看“注冊表編程相關函數”一文。一個完整的例子如下：
| '*************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 '注意以下的函數聲明須在一行內寫完 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為我們讀取出來的多重字符串 'S2為轉換后的字符串數組 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個數 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按鈕和text文本框 '************EnumVal2.frm**************** '以下的Command1_Click事件中我們將列舉出'HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun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, "SoftwareMicrosoftWindowsCurrentVersionRun", 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調用得到了第一個Name的長度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, "(預設值)",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 |