SHChangeNotify

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SHChangeNotify

WINSHELLAPI void WINAPI SHChangeNotify( LONG wEventId, UINT uFlags, LPCVOID dwItem1, LPCVOID dwItem2 );

Notifies the system of an event that an application has performed. An application should use this function if it performs an action that may affect the shell.

wEventId

Describes the event that has occurred. Typically, only one event is specified at a time. If more than one event is specified, the values contained in the dwItem1 and dwItem2 parameters must be the same, respectively, for all specified events. This parameter can be one or more of the following values:

SHCNE_ALLEVENTS	All events have occurred.
SHCNE_ASSOCCHANGED	A file type association has changed. SHCNF_IDLIST must be specified in the uFlags parameter. dwItem1 and dwItem2 are not used and must be NULL.
SHCNE_ATTRIBUTES	The attributes of an item or folder have changed. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the item or folder that has changed. dwItem2 is not used and should be NULL.
SHCNE_CREATE	A nonfolder item has been created. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the item that was created. dwItem2 is not used and should be NULL.
SHCNE_DELETE	A nonfolder item has been deleted. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the item that was deleted. dwItem2 is not used and should be NULL.
SHCNE_DRIVEADD	A drive has been added. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the root of the drive that was added. dwItem2 is not used and should be NULL.
SHCNE_DRIVEADDGUI	A drive has been added and the shell should create a new window for the drive. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the root of the drive that was added. dwItem2 is not used and should be NULL.
SHCNE_DRIVEREMOVED	A drive has been removed. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the root of the drive that was removed. dwItem2 is not used and should be NULL.
SHCNE_EXTENDED_EVENT	Not currently used.
SHCNE_FREESPACE	The amount of free space on a drive has changed. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the root of the drive on which the free space changed. dwItem2 is not used and should be NULL.
SHCNE_MEDIAINSERTED	Storage media has been inserted into a drive. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the root of the drive that contains the new media. dwItem2 is not used and should be NULL.
SHCNE_MEDIAREMOVED	Storage media has been removed from a drive. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the root of the drive from which the media was removed. dwItem2 is not used and should be NULL.
SHCNE_MKDIR	A folder has been created. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the folder that was created. dwItem2 is not used and should be NULL.
SHCNE_NETSHARE	A folder on the local computer is being shared via the network. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the folder that is being shared. dwItem2 is not used and should be NULL.
SHCNE_NETUNSHARE	A folder on the local computer is no longer being shared via the network. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the folder that is no longer being shared. dwItem2 is not used and should be NULL.
SHCNE_RENAMEFOLDER	The name of a folder has changed. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the previous PIDL or name of the folder. dwItem2 contains the new PIDL or name of the folder.
SHCNE_RENAMEITEM	The name of a nonfolder item has changed. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the previous PIDL or name of the item. dwItem2 contains the new PIDL or name of the item.
SHCNE_RMDIR	A folder has been removed. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the folder that was removed. dwItem2 is not used and should be NULL.
SHCNE_SERVERDISCONNECT	The computer has disconnected from a server. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the server from which the computer was disconnected. dwItem2 is not used and should be NULL.
SHCNE_UPDATEDIR	The contents of an existing folder have changed, but the folder still exists and has not been renamed. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the folder that has changed. dwItem2 is not used and should be NULL. If a folder has been created, deleted, or renamed, use SHCNE_MKDIR, SHCNE_RMDIR, or SHCNE_RENAMEFOLDER, respectively, instead.
SHCNE_UPDATEIMAGE	An image in the system image list has changed. SHCNF_DWORD must be specified in uFlags. dwItem1 contains the index in the system image list that has changed. dwItem2 is not used and should be NULL.
SHCNE_UPDATEITEM	An existing nonfolder item has changed, but the item still exists and has not been renamed. SHCNF_IDLIST or SHCNF_PATH must be specified in uFlags. dwItem1 contains the item that has changed. dwItem2 is not used and should be NULL. If a nonfolder item has been created, deleted, or renamed, use SHCNE_CREATE, SHCNE_DELETE, or SHCNE_RENAMEITEM, respectively, instead.

The following values specify combinations of other events:

SHCNE_DISKEVENTS Specifies a combination of all of the disk event identifiers.

SHCNE_GLOBALEVENT Specifies a combination of all of the global event identifiers.

The following value modifies other event values and cannot be used alone:

SHCNE_INTERRUPT The specified event occurred as a result of a system interrupt.

uFlags

Flags that indicate the meaning of the dwItem1 and dwItem2 parameters. The uFlags parameter must be one of the following values:

SHCNF_DWORD	The dwItem1 and dwItem2 parameters are DWORD values.
SHCNF_IDLIST	dwItem1 and dwItem2 are the addresses of ITEMIDLIST structures that represent the item(s) affected by the change. Each ITEMIDLIST must be relative to the desktop folder.
SHCNF_PATH	dwItem1 and dwItem2 are the addresses of NULL-terminated strings that contain the full path names of the items affected by the change.
SHCNF_PRINTER	dwItem1 and dwItem2 are the addresses of NULL-terminated strings that represent the friendly names of the printer(s) affected by the change.

The following flags modify other data-type flags and cannot be used by themselves:

SHCNF_FLUSH The function should not return until the notification has been delivered to all affected components.

SHCNF_FLUSHNOWAIT The function should begin delivering notifications to all affected components but should return as soon as the notification process has begun.

dwItem1

First event-dependent value.

dwItem2

Second event-dependent value.


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SHCNE_DISKEVENTS	Specifies a combination of all of the disk event identifiers.
SHCNE_GLOBALEVENT	Specifies a combination of all of the global event identifiers.

SHCNF_FLUSH	The function should not return until the notification has been delivered to all affected components.
SHCNF_FLUSHNOWAIT	The function should begin delivering notifications to all affected components but should return as soon as the notification process has begun.