VB怎样读取注册表中的程序安装路径？？？送25分

[ly_czy]

我想作个小程序（程序在光盘上），当光盘放入光驱自动运行小程序，判断PC机里是否装
阅读器程序Acrobat Reader 4.0 。如已安装则启动程序Acrord32.exe并打开某一PDF文件；
未安装则执行Acrobat Reader 4.0 的SETUP。注册表中Acrord32.exe的登记信息为：
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\App Paths\Acrord32.exe
如安装路径为"D:\Program Files\Reader\AcroRd32.exe"，怎样提取这个路径？！请赐教！！！

[zyl910]

要用三个API：
RegOpenKeyEx
RegQueryValueEx
RegCloseKey

[ly_czy]

谢谢！最好弄个例子

[zyl910]

代码：

Public Const HKEY_LOCAL_MACHINE = &H80000002

Private Sub Form_Load()
Dim GetPath as String

If RegGetStr(HKEY_LOCAL_MACHINE, "Software\Microsoft\Windows\CurrentVersion\App Paths\Acrord32.exe", "Path", GetPath) Then
'已安装的代码
Else
'未安装的代码
End If
End Sub

Public Function RegGetStr(MainKey As Long, SubKey As String, KeyName As String, OutData As String) As Long
Dim hKey As Long
Dim TempStr As String
Dim StrLen As Long
Dim KeyType As Long
Dim Rc As Long

StrLen = 260
TempStr = String$(StrLen, Chr$(0))

Rc = RegOpenKeyEx(MainKey, SubKey, 0, KEY_ALL_ACCESS, hKey)

'Debug.Print "Load1:" & Rc
If Rc = 0 Then
Rc = RegQueryValueEx(hKey, KeyName, 0, KeyType, ByVal TempStr, StrLen)

If KeyType <> REG_SZ Then
RegGetStr = -1
Exit Function

End If

'Debug.Print "Load2: " & Rc
If Rc = 0 Then
OutData = Left$(TempStr, StrLen)

Else
RegGetStr = Rc

End If

RegCloseKey hKey

Else
RegGetStr = Rc

End If

End Function

[zyl910]

例子：

Public Const HKEY_LOCAL_MACHINE = &H80000002

Private Sub Form_Load()
Dim PathStr as String

If RegGetStr (HKEY_LOCAL_MACHINE, _
"HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\App Paths\Acrord32.exe", _
"Path", PathStr) Then
'已安装的代码
Else
'未安装的代码
End If

End Sub

Public Function RegGetStr(MainKey As Long, SubKey As String, KeyName As String, OutData As String) As Long
Dim hKey As Long
Dim TempStr As String
Dim StrLen As Long
Dim KeyType As Long
Dim Rc As Long

StrLen = 260
TempStr = String$(StrLen, Chr$(0))

Rc = RegOpenKeyEx(MainKey, SubKey, 0, KEY_ALL_ACCESS, hKey)

'Debug.Print "Load1:" & Rc
If Rc = 0 Then
Rc = RegQueryValueEx(hKey, KeyName, 0, KeyType, ByVal TempStr, StrLen)

If KeyType <> REG_SZ Then
RegGetStr = -1
Exit Function

End If

'Debug.Print "Load2: " & Rc
If Rc = 0 Then
OutData = Left$(TempStr, StrLen)

Else
RegGetStr = Rc

End If

RegCloseKey hKey

Else
RegGetStr = Rc

End If

End Function

[jamex]

' 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...
'---------------------------------------------------------------
Private Declare Function RegCloseKey Lib "advapi32" (ByVal hKey As Long) As Long
Private 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
Private 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
Private 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
Private 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
Private Declare Function RegDeleteKey Lib "advapi32.dll" Alias "RegDeleteKeyA" (ByVal hKey As Long, ByVal lpSubKey As String) As Long
Private Declare Function RegDeleteValue Lib "advapi32.dll" Alias "RegDeleteValueA" (ByVal hKey As Long, ByVal lpValueName As String) As Long

'---------------------------------------------------------------
'- 注册表 Api 常数...
'---------------------------------------------------------------
' Reg Data Types...
Const REG_SZ = 1 ' Unicode空终结字符串
Const REG_EXPAND_SZ = 2 ' Unicode空终结字符串
Const REG_DWORD = 4 ' 32-bit 数字

' 注册表创建类型值...
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...
Const READ_CONTROL = &H20000
Const KEY_QUERY_VALUE = &H1
Const KEY_SET_VALUE = &H2
Const KEY_CREATE_SUB_KEY = &H4
Const KEY_ENUMERATE_SUB_KEYS = &H8
Const KEY_NOTIFY = &H10
Const KEY_CREATE_LINK = &H20
Const KEY_READ = KEY_QUERY_VALUE + KEY_ENUMERATE_SUB_KEYS + KEY_NOTIFY + READ_CONTROL
Const KEY_WRITE = KEY_SET_VALUE + KEY_CREATE_SUB_KEY + READ_CONTROL
Const KEY_EXECUTE = KEY_READ
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

'ICON
Public Const RT_BITMAP = 2&
Public Const RT_ICON = 3&
Public Const RT_CURSOR = 1&
Private Type GUID
Data1 As Long
Data2 As Integer
Data3 As Integer
Data4(7) As Byte
End Type

Private Type PicBmp
Size As Long
Type As Long
hBmp As Long
hPal As Long
Reserved As Long
End Type




'-------------------------------------------------------------------------------------------------
'sample usage - Debug.Print UpodateKey(HKEY_CLASSES_ROOT, "keyname", "newvalue")
'-------------------------------------------------------------------------------------------------
Public Function UpdateKey(KeyRoot As Long, KeyName As String, SubKeyName As String, SubKeyValue As String) As Boolean
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...
'------------------------------------------------------------
rc = RegCreateKeyEx(KeyRoot, KeyName, _
0, REG_SZ, _
REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, lpAttr, _
hKey, hDepth) ' 创建/打开//KeyRoot//KeyName

If (rc <> ERROR_SUCCESS) Then GoTo CreateKeyError ' 错误处理...

'------------------------------------------------------------
'- 创建/修改关键字值...
'------------------------------------------------------------
If (SubKeyValue = "") Then SubKeyValue = " " ' 要让RegSetValueEx() 工作需要输入一个空格...

' 创建/修改关键字值
rc = RegSetValueEx(hKey, SubKeyName, _
0, REG_SZ, _
SubKeyValue, LenB(StrConv(SubKeyValue, vbFromUnicode)))

If (rc <> ERROR_SUCCESS) Then GoTo CreateKeyError ' 错误处理
'------------------------------------------------------------
'- 关闭注册表关键字...
'------------------------------------------------------------
rc = RegCloseKey(hKey) ' 关闭关键字

UpdateKey = True ' 返回成功
Exit Function ' 退出
CreateKeyError:
UpdateKey = False ' 设置错误返回代码
rc = RegCloseKey(hKey) ' 试图关闭关键字
End Function

'-------------------------------------------------------------------------------------------------
'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


Public Function DeleteKey(KeyRoot As Long, KeyName As String) As Boolean
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

'------------------------------------------------------------
' 删除注册表关键字...
'------------------------------------------------------------
rc = RegDeleteKey(hKey, "")

If (rc <> ERROR_SUCCESS) Then GoTo GetKeyError ' 错误处理

DeleteKey = True ' 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...
DeleteKey = False
rc = RegCloseKey(hKey) ' 关闭注册表关键字

End Function