CeRegOpenKeyEx (RAPI)

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This function opens the specified registry key on a remote Microsoft® Windows® CE–based device.

LONG CeRegOpenKeyEx( 
  HKEY hKey, 
  LPCWSTR lpszSubKey, 
  DWORD ulOptions, 
  REGSAM samDesired, 
  PHKEY phkResult 


  • hKey
    [in] Handle to a currently open key or any of the following predefined reserved handle values:





    Windows CE does not support the HKEY_CURRENT_CONFIG, HKEY_PERFORMANCE_DATA, or HKEY_DYN_DATA predefined reserved handle values.

  • lpszSubKey
    [in] Pointer to a null-terminated string containing the name of the subkey to open. If this parameter is NULL or a pointer to an empty string, the function will open a new handle to the key identified by the hKey parameter. In this case, the function will not close the handles previously opened.

  • ulOptions
    [in] Reserved; set to 0.

  • samDesired
    [in] Not supported; set to zero.

  • phkResult
    [out] Pointer to a variable that receives a handle to the opened key. When you no longer need the returned handle, call the CeRegCloseKey function to close it.

Return Values

ERROR_SUCCESS indicates success. A nonzero error code defined in Winerror.h indicates failure. To get a generic description of the error, call FormatMessage with the FORMAT_MESSAGE_FROM_SYSTEM flag set.


Unlike the CeRegCreateKeyEx function, the CeRegOpenKeyEx function does not create the specified key if the key does not exist in the registry.


Pocket PC: Pocket PC 2002 and later
Smartphone: Smartphone 2002 and later
OS Versions: Windows CE 3.0 and later
Header: Rapi.h
Library: Rapi.lib

See Also

Remote API Functions | CeRegCreateKeyEx | CeRegDeleteKey

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