CRegKey::QueryQWORDValue

Call this method to retrieve the QWORD data for a specified value name.

LONG QueryQWORDValue(
   LPCTSTR pszValueName,
   ULONGLONG& qwValue 
) throw( );

Parameters

• pszValueName
  Pointer to a null-terminated string containing the name of the value to query.

• qwValue
  Pointer to a buffer that receives the QWORD.

Return Value

If the method succeeds, ERROR_SUCCESS is returned. If the method fails to read a value, it returns a nonzero error code defined in WINERROR.H. If the data referenced is not of type REG_QWORD, ERROR_INVALID_DATA is returned.

Remarks

This method makes use of RegQueryValueEx and confirms that the correct type of data is returned. See RegQueryValueEx for more details.

Security Note:
This method allows the caller to specify any registry location, potentially reading data which cannot be trusted. Also, the RegQueryValueEx function used by this method does not explicitly handle strings which are NULL terminated. Both conditions should be checked for by the calling code.

Requirements

Header: atlbase.h

See Also

Concepts

CRegKey Class

CRegKey Members

CRegKey::SetQWORDValue

CRegKey::QueryBinaryValue

CRegKey::QueryDWORDValue

CRegKey::QueryGUIDValue

CRegKey::QueryMultiStringValue

CRegKey::QueryStringValue