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CeRegEnumKeyEx (RAPI) (Windows Embedded CE 6.0)

  • Artigo

1/6/2010

This function enumerates subkeys of an open registry key on a remote Windows Embedded CE–based device.

Syntax

LONG CeRegEnumKeyEx(
  HKEY hKey, 
  DWORD dwIndex, 
  LPWSTR lpName, 
  LPDWORD lpcbName, 
  LPDWORD lpReserved, 
  LPWSTR lpClass, 
  LPDWORD lpcbClass, 
  PFILETIME lpftLastWriteTime 
);

Parameters

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

    HKEY_CLASSES_ROOT

    HKEY_CURRENT_USER

    HKEY_LOCAL_MACHINE

    HKEY_USERS

    The enumerated keys are subkeys of the key identified by hKey.

  • dwIndex
    [in] Specifies the index of the subkey to retrieve. This parameter should be zero for the first call to the CeRegEnumKeyEx function and then incremented for subsequent calls.

    Because subkeys are not ordered, any new subkey will have an arbitrary index. This means that the function may return subkeys in any order.

  • lpName
    [out] Pointer to a buffer that receives the name of the subkey, including the terminating null character. The function copies only the name of the subkey, not the full key hierarchy, to the buffer.
  • lpcbName
    [in, out] Pointer to a variable that specifies the size, in characters, of the buffer specified by the lpName parameter. This size should include the terminating null character. When the function returns, the variable pointed to by lpcbName contains the number of characters stored in the buffer. The count returned does not include the terminating null character.
  • lpReserved
    [in] Reserved; set to NULL.
  • lpClass
    [out] Pointer to a buffer that contains the class of the enumerated subkey when the function returns. This parameter can be NULL if the class is not required.
  • lpcbClass
    [in, out] Pointer to a variable that specifies the size, in characters, of the buffer specified by the lpClass parameter. The size should include the terminating null character. When the function returns, lpcbClass contains the number of characters stored in the buffer. The count returned does not include the terminating null character. This parameter can be NULL only if lpClass is NULL.
  • lpftLastWriteTime
    [in] Ignored; set to NULL.

Return Value

ERROR_SUCCESS indicates success. A return value of ERROR_MORE_DATA indicates that the lpName buffer is too small to receive the name of the key. 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. The message resource is optional, therefore, if you call FormatMessage it could fail.

Remarks

To enumerate subkeys, an application should initially call the CeRegEnumKeyEx function with the dwIndex parameter set to zero. An application should then increment the dwIndex parameter and call CeRegEnumKeyEx until there are no more subkeys (until the function returns ERROR_NO_MORE_ITEMS).

To retrieve the number of subkeys for a given key, use the CeRegQueryInfoKey function.

While an application is using the CeRegEnumKeyEx function, it should not make calls to any registration functions that might change the key being enumerated.

The key identified by hKey must have been opened with KEY_ENUMERATE_SUB_KEYS access (KEY_READ includes KEY_ENUMERATE_SUB_KEYS). Use the CeRegCreateKeyEx or CeRegOpenKeyEx function to open the key.

Requirements

Header rapi.h
Library rapi.lib
Windows Embedded CE Windows CE 3.0 and later

See Also

Reference

RAPI Functions
CeRegCreateKeyEx (RAPI)
CeRegDeleteKey (RAPI)
CeRegOpenKeyEx (RAPI)
CeRegQueryInfoKey (RAPI)