please dont rip this site Prev Next

FMExtensionProc info

The FMExtensionProc function is an application-defined callback function that processes menu commands and messages sent to a File Manager extension dynamic-link library (DLL).

LONG WINAPI FMExtensionProc(

    HWND hwnd,

// handle to extension window

    WORD wEvent,

// menu-item identifier, or message

    LONG lParam 

// additional message information



Identifies the File Manager window. An extension DLL should use this handle to specify the owner for any dialog box or message box that the DLL may display and to send request messages to File Manager.
Specifies the message. This parameter can be one of the following values:




The user selected the menu item identified by this number.


User selected the extensionís menu.


File Manager is loading the extension DLL.


Selection changed in File Managerís directory window or in Search Results window.


File Manager is unloading the extension DLL.


User chose the Refresh command from the Window menu.

Specifies 32 bits of additional message-specific information.

Return Values

The callback function should return the result of the message processing. The actual return value depends on the message processed.


Whenever File Manager calls the FMExtensionProc function, it waits to refresh its directory windows (for changes in the file system) until after the function returns. This allows the extension to perform large numbers of file operations without excessive repainting by File Manager. It is not necessary for the extension to send the FM_REFRESH_WINDOWS message to notify File Manager to repaint its windows.

file: /Techref/os/win/api/win32/func/src/f25_10.htm, 4KB, , updated: 2000/4/7 12:06, local time: 2022/9/24 20:05,

 ©2022 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF=""> FMExtensionProc</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.

Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?


Welcome to!

Site supported by
sales, advertizing,
& kind contributors
just like you!

Please don't rip/copy
(here's why

Copies of the site on CD
are available at minimal cost.

Welcome to!