FMExtensionProcFMExtensionProc*
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FMExtensionProc


LONG WINAPI FMExtensionProc(
    HWND hwnd,
    WORD wMsg,
    LONG lParam
);

Application-defined callback function called by File Manager to communicate with a File Manager extension.

hwnd
Window handle to File Manager. An extension should use this handle to specify the parent window for any dialog box or message box it must display; it should also use this handle to send query messages to File Manager.
wMsg
One of the following File Manager messages:
1 through 99 User selected an item from the extension-supplied menu. The value is the identifier of the selected menu item.
FMEVENT_HELPMENUITEM User pressed F1 while selecting an extension menu or toolbar command item. File Manager wants the extension to call WinHelp appropriately for the command item.
FMEVENT_HELPSTRING User selected an extension menu or toolbar command item. File Manager wants the extension to supply a Help string.
FMEVENT_INITMENU User selected the extension's menu. The extension should initialize items in the menu.
FMEVENT_LOAD File Manager is loading the extension DLL and prompts the DLL for information about the menu that the DLL supplies.
FMEVENT_SELCHANGE Selection in the File Manager directory window or Search Results window has changed.
FMEVENT_TOOLBARLOAD File Manager is creating the toolbar and prompts the extension DLL for information about any buttons the DLL adds to the toolbar.
FMEVENT_UNLOAD File Manager is unloading the extension DLL.
FMEVENT_USER_REFRESH User selected the Refresh command from the Window menu. The extension should update items in the menu, if necessary.
lParam
Message-specific value.

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