File Change Notification in Windows Mobile

 

Delete a file in resource manager and change the name of a folder. How is this done? The answer is the file change notification.

 

First look at a structure

 

Typedef struct tagshchangenotifyentry {

 

DWORD dweventmask;

 

Lptstr pszwatchdir;

 

Bool frecursive;

 

} Shchangenotifyentry;

 

To receive the file change message, we need to use a window hwnd and register it in the wm_create message created in the window:

 

Shchangenotifyentry schnenotifyentry;

 

Schnenotifyentry. dweventmask = shcn_allevents; // monitors all events

 

Schnenotifyentry. pszwatchdir = NULL; // The name of the directory to be monitored. null indicates all

 

Schnenotifyentry. frecursive = true; // whether to recursion when monitoring the Directory

 

Shchangenotifyregister (hwnd, & schnenotifyentry );

 

In the window procedure function, we respond to the wm_filechangeinfo message.

 

Case wm_filechangeinfo:

 

{

 

Filechangenotify * lpfcn;

 

Filechangeinfo * lpfci;

 

Lpfcn = (filechangenoworkflow *) lparam;

 

If (null = lpfcn)

 

{

 

Break;

 

}

 

Lpfci = & (lpfcn-> FCI );

 

If (null = lpfci)

 

{

 

Break;

 

}

 

Else

 

{

 

If (false = shcnevent (lpfci ))

 

{

 

MessageBox (text ("schne event failed"), text ("error"), mb_ OK );

 

}

 

}

 

 

 

Shchangenotifyfree (lpfcn );

 

}

 

Break;

 

Implementation of the shcnevent function is as follows:

 

Bool shcnevent (filechangeinfo * lpfci)

 

{

 

// Lpfci-> weventid, event

 

// Lpfci-> dwitem1, old file or directory name

 

// Lpfci-> dwitem2, new file or directory name

 

// Lpfci-> dwattributes, file or directory features

 

// Lpfci-> ftmodified, time when the file is changed

 

// Lpfci-> nfilesize, file size

 

Switch (lpfci-> weventid)

 

{

 

Case shcn_renameitem:

 

Break;

 

 

 

Case shcn_create:

 

Break;

 

 

 

Case shcn_delete:

 

Break;

 

 

 

Case shcn_mkdir:

 

Break;

 

 

 

Case shcn_rmdir:

 

Break;

 

 

 

Case shcn_mediainserted:

 

Break;

 

 

 

Case shcn_mediaremoved:

 

Break;

 

 

 

Case shcn_driveadd:

 

Break;

 

 

 

Case shcn_driveremoved:

 

Break;

 

 

 

Case shcn_netshare:

 

Break;

 

 

 

Case shcn_netunshare:

 

Break;

 

 

 

Case shcn_attributes:

 

Break;

 

 

 

Case shcn_updatedir:

 

Break;

 

 

 

Case shcn_serverdisconnect:

 

Break;

 

 

 

Case shcn_renamefolder:

 

Break;

 

 

 

Default:

 

Break;

 

}

 

 

 

Return true;

 

}

 

Based on the event, you can know which file or directory has changed.

 

Finally, log out at the hwnd destruction:

 

Shchangenotifyderegister (hwnd );

 

 

This article from the csdn blog, reproduced please indicate the source: http://blog.csdn.net/pknife/archive/2009/08/27/4490213.aspx