Windows SDK Registry: How can I read data from the registry?

[Andreas Masur]

Q: How can I read data from the registry?

A:

HKEY  hKey;
DWORD dwSize     = 0;
DWORD dwDataType = 0;
DWORD dwValue    = 0;

if(::RegOpenKeyEx(HKEY_LOCAL_MACHINE,
                  "System\\CurrentControlSet\\Control\\Windows",
                  0,
                  KEY_QUERY_VALUE,
                  &hKey) == ERROR_SUCCESS)
{
  // Get CSD version
  dwSize = sizeof(dwValue);

  if(::RegQueryValueEx(hKey,
                       "CSDVersion",
                       0,
                       &dwDataType,
                       reinterpret_cast<BYTE *>(&dwValue),
                       &dwSize) != ERROR_SUCCESS)
  {
    // Close key
    ::RegCloseKey(hKey);

    // Error handling
  }
  else
  {
    // Work with value
    // Close key
    ::RegCloseKey(hKey);
  }
}
else
  // Error handling;