RegQueryValueEx returns wrong value

[vks11]

Hi all, While debugging the following code,

inline LONG CRegKey::QueryValue(LPTSTR szValue, LPCTSTR lpszValueName, DWORD* pdwCount)
{
ATLASSERT(pdwCount != NULL);
DWORD dwType = NULL;
LONG lRes = RegQueryValueEx(m_hKey, (LPTSTR)lpszValueName, NULL, &dwType,
(LPBYTE)szValue, pdwCount);
ATLASSERT((lRes!=ERROR_SUCCESS) || (dwType == REG_SZ) ||
(dwType == REG_MULTI_SZ) || (dwType == REG_EXPAND_SZ));
return lRes;
}

Here the value for (LPTSTR)lpszValueName is 'SQLPath' and the value which returns for 'szValue' in RegQueryValueEx method is “c:\Program Files (x86)\Microsoft SQL Server\100\Tools\” which should be “c:\Program Files\Microsoft SQL Server\100\Tools\” We have noted that the data value for SQLPath in RegistryKey "SOFTWARE\Microsoft\Microsoft SQL Server\100\Tools\ClientSetup" is “c:\Program Files\Microsoft SQL Server\100\Tools\” Could anybody please tell why RegQueryValueEx method is returning a wrong value “c:\Program Files (x86)\Microsoft SQL Server\100\Tools\” which should be “c:\Program Files\Microsoft SQL Server\100\Tools\” Thanks in advance

[Lost User]

It may be that you are running a 32 bit application, in which case it will use Program Files (x86), which is where the 32-bit versions are located.

[Freak30]

When a 32 bit application accesses the path starting with SOFTWARE under the key HKEY_LOCAL_MACHINE on a 64 bit OS, there is a Wow6432Node added automatically after the SOFTWARE. So the path you really accessed was "SOFTWARE\Wow6432Node\Microsoft\Microsoft SQL Server\100\Tools\ClientSetup" instead of the one you expected. Depening on what you want to use the information for, you may need to compile your app as x64.

The good thing about pessimism is, that you are always either right or pleasently surprised.

[Lost User]

Hi, Add the KEY_WOW64_64KEY flag[^] to the samDesired parameter of RegOpenKeyExfunction [^]before passing the handle to RegQueryValueEx[^] if you want to avoid Registry Virtualization[^]. Best Wishes, -David Delaune

[vks11]

Thanks a lot!! :thumbsup:

[vks11]

Thanks a lot David!! :thumbsup:

[vks11]

Thanks a lot!!:thumbsup: