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RegQueryValue 百科内容来自于： 百度百科

VB声明：

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

vc声明：

LONG RegQueryValue(
　　 HKEY hkey,
　　 LPCTSTR lpSubkey,
　　 LPTSTR lpValue,
　　 PLONG lpcbValue
　　);

说明：

取得指定项或子项的默认（未命名）值
返回值
【Long】 0（ERROR_SUCCESS）表示成功。其他任何值都代表一个错误代码。

参数 类型及说明：

hKey
一个已打开表项的句柄，或者指定一个标准项名（即注册表中的几个根注册表项）
lpSubKey
指向一个空终止的字符串指针，指示这个函数将打开或创建的表项的名称。这个表项必须是由hkey参数所标识的子项。
lpValue
一个返回值，指向一个缓存区，用来获得与指定子项默认值相关的一个字符串。
lpcbValue
指定一个变量，用于装载lpValue缓冲区的长度。一旦返回，它会设为实际载入缓冲区的字节数量。该大小包含了数据长度还加上了终止符的空字符串。

注解：

win32应用程序应该使用RegQueryValueEx。lpValue被定义成一个字串，以维持同win16的兼容性（在win16中，值全都是字串）

VC部分特别注解：

如果在调用 RegQueryValue函数时，将其第三个参数设置为 NULL，第四个参数设置为非 NULL，那么该函数将返回存储数据的大小。这样，可以让应用程序确定一个最佳的方式来存储将要获取到的数据，然后再去获取数据，也就是说，程序可以根据该函数此时返回的数据长度动态分配一块内存，用来保存将要获取的数据的大小，即，就可以采用这种方式，依次调用两次 RegQueryValue函数，第一次调用该函数得到将要获取数据的长度，然后动态分配内存，接着再次调用该函数得到数据。

VC注册表操作声明及示例：

void C某函数::On某成员函数()
　　{
　　LONG lValue;
　　 RegQueryValue(HKEY_LOCAL_MACHINE,"注册表子项路径",NULL,&lValue);
　　char *pBuf =new char[lValue];
　　 RegQueryValue(HKEY_LOCAL_MACHINE,"注册表子项路径",pBuf,&lValue);
　　AfxMessageBox(pBuf);
　　}

VB注册表操作声明及示例：

Public Declare FunctionRegOpenKeyLib "advapi32.dll" Alias "RegOpenKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Public Declare FunctionRegEnumValueLib "advapi32.dll" Alias "RegEnumValueA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpValueName As String, lpcbValueName As Long, ByVal lpReserved As Long, lpType As Long, lpData As Byte, lpcbData As Long) As Long
Public Declare Function RegCloseKey Lib "advapi32.dll" (ByVal hKey As Long) As Long
Public Declare FunctionRegCreateKeyLib "advapi32.dll" Alias "RegCreateKeyA" (ByVal hKey As Long, ByVal lpSubKey As String, phkResult As Long) As Long
Public Declare FunctionRegQueryValueExLib "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
Public Declare FunctionRegEnumKeyExLib "advapi32.dll" Alias "RegEnumKeyExA" (ByVal hKey As Long, ByVal dwIndex As Long, ByVal lpName As String, lpcbName As Long, ByVal lpReserved As Long, ByVal lpClass As String, lpcbClass As Long, lpftLastWriteTime As Any) As Long
Public Declare Function RegSetValueEx Lib "advapi32.dll" Alias "RegSetValueExA" (ByVal hKey As Long, ByVal lpValueName As String, ByVal Reserved As Long, ByVal dwType As Long, lpData As Any, ByVal cbData As Long) As Long
Public Declare FunctionRegDeleteValueLib "advapi32.dll" Alias "RegDeleteValueA" (ByVal hKey As Long, ByVal lpValueName As String) As Long
Public Declare FunctionRegDeleteKeyLib "advapi32.dll" Alias "RegDeleteKeyA" (ByVal hKey As Long, ByVal lpSubKey As String) As Long
Public Const HKEY_CLASSES_ROOT = &H80000000
Public Const HKEY_CURRENT_USER = &H80000001
Public Const HKEY_LOCAL_MACHINE = &H80000002
Public Const HKEY_USERS = &H80000003
Private Const REG_SZ = 1&
Private Const REG_EXPAND_SZ = 2&
Private Const REG_BINARY = 3&
Private Const REG_DWORD = 4&
Private Const ERROR_SUCCESS = 0&
'==================================================
'================================
'注册表操作函数
'================================
'读取注册表字符串键值
Public Function GetString(hKey As Long, strPath As String, strValue As String)
Dim keyhand As Long
Dim lResult As Long
Dim strBuf As String
Dim lDataBufSize As Long
Dim intZeroPos As Integer
Dim lValueType As Long 'new add
RegOpenKeyhKey, strPath, keyhand
lResult =RegQueryValueEx(keyhand, strValue, 0&, lValueType, ByVal 0&, lDataBufSize)
If lValueType = REG_SZ Or lValueType = REG_EXPAND_SZ Then
strBuf = String(lDataBufSize, " ")
lResult =RegQueryValueEx(keyhand, strValue, 0&, lValueType, ByVal strBuf, lDataBufSize)
If lResult = ERROR_SUCCESS Then
intZeroPos = InStr(strBuf, Chr$(0))
If intZeroPos > 0 Then
GetString = left$(strBuf, intZeroPos - 1)
Else: GetString = strBuf
End If
End If
End If
End Function
'写入注册表字符串键值
Public Sub SetString(hKey As Long, strPath As String, strValue As String, strdata As String)
Dim keyhand As Long
RegCreateKeyhKey, strPath, keyhand
RegSetValueEx keyhand, strValue, 0, REG_SZ, ByVal strdata, Len(strdata)
RegCloseKey keyhand
End Sub
'读取注册表 DWORD 键值
Function GetDword(ByVal hKey As Long, ByVal strPath As String, ByVal strValueName As String) As Long
Dim lResult As Long
Dim lValueType As Long
Dim lBuf As Long
Dim lDataBufSize As Long
Dim r As Long
Dim keyhand As Long
r =RegOpenKey(hKey, strPath, keyhand)
' Get length/data type
lDataBufSize = 4
lResult =RegQueryValueEx(keyhand, strValueName, 0&, lValueType, lBuf, lDataBufSize)
If lResult = ERROR_SUCCESS Then
If lValueType = REG_DWORD Then
GetDword = lBuf
End If
'Else
' Call errlog("GetDWORD-" & strPath, False)
End If
r = RegCloseKey(keyhand)
End Function
'写入注册表 DWORD 键值
Function SetDword(ByVal hKey As Long, ByVal strPath As String, ByVal strValueName As String, ByVal lData As Long)
Dim keyhand As Long
RegCreateKeyhKey, strPath, keyhand
RegSetValueEx keyhand, strValueName, 0&, REG_DWORD, lData, 4
RegCloseKey keyhand
End Function
'读取注册表二进制键值
FunctionGetBinary(ByVal hKey As Long, ByVal strPath As String, ByVal strValueName As String) As Long
Dim lResult As Long
Dim lValueType As Long
Dim lBuf As Long
Dim lDataBufSize As Long
Dim r As Long
Dim keyhand As Long
r = RegOpenKey(hKey, strPath, keyhand)
' Get length/data type
lDataBufSize = 4
lResult = RegQueryValueEx(keyhand, strValueName, 0&, lValueType, lBuf, lDataBufSize)
If lResult = ERROR_SUCCESS Then
If lValueType = REG_BINARY Then
GetBinary= lBuf
End If
End If
r = RegCloseKey(keyhand)
End Function
'写入注册表二进制键值
Function SetBinary(ByVal hKey As Long, ByVal strPath As String, ByVal strValueName As String, ByVal lData As Long, ByVal BitNumber As Long)
Dim keyhand As Long
RegCreateKey hKey, strPath, keyhand
RegSetValueEx keyhand, strValueName, 0&, REG_BINARY, lData, BitNumber
RegCloseKey keyhand
End Function
'删除一个注册表键值
Public Function DeleteValue(ByVal hKey As Long, ByVal strPath As String, ByVal strValue As String)
Dim keyhand As Long
RegOpenKey hKey, strPath, keyhand
RegDeleteValuekeyhand, strValue
RegCloseKey keyhand
End Function
'创建一个主键
Public Function CreateKey(ByVal hKey As Long, ByVal strKey As String)
Dim keyhand&
RegCreateKey hKey, strKey, keyhand
RegCloseKey keyhand&
End Function
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进来说说原因吧 确定