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From: lab@sdgsun.uucp (Larry Baird)
Newsgroups: comp.windows.ms
Subject: RE: registering a call in a DLL
Message-ID: <1990Jul13.231427.4144@sdgsun.uucp>
Date: 13 Jul 90 23:14:27 GMT
Organization: SDG Group of SAIC COMSYSTEMS
Lines: 61

There are a couple of tricks you need to apply.	
Register your new class from you DLL's init function.
Have every application that uses your new class call a registeration and dereg 
function. In the reg function keep count
of how many peple are using your class.  In the dereg
if this is last user you need to help windows
and do a little clean up.  Here's the code i use for
reg and dereg.  NOTE: Each should only be called once per applicatio.
Hope this helps.




static WORD wRefCount = 0;			// Number of users

void FAR PASCAL pgStartUp( void )
	{
	LockData( 0 );
	
	wRefCount++;
	
	UnlockData( 0 );
	}

void PASCAL FAR pgCleanUp( HANDLE hInstance )
	{
	LockData( 0 );
	
	if ( --wRefCount == 0 )
		{
		HWND		hWnd;
		HANDLE		hModule;
		
		hWnd = CreateWindow ( 
					PAGE_CLASS,							// window class name
                    NULL,  		  	 					// window caption
					0L,									// window style
                    0,     								// initial x position
                    0,   								// initial y position
                    0,									// initial x size
                    0,									// initial y size
                    NULL,                   			// parent window handle
                    NULL,                    			// window menu handle
                    hInstance,               			// program handle
                    NULL );			           			// create parameters
		UTIL_WIN_ASSERT( hWnd != NULL );
			
		hModule = GetModuleHandle( MAKEINTRESOURCE( hInstance ) );
		UTIL_WIN_ASSERT( hModule != NULL );
			
		SetClassWord( hWnd, GCW_HMODULE, hModule );
		DestroyWindow( hWnd );
		}
		
	UnlockData( 0 );
	}
-- 
Larry A. Baird 				SAIC ComSystems, SDG division
Manager, Software Development           450 N. Lakemont Avenue
UUCP:ucf-cs!sdgsun!lab                  Winter Park, FL 32792
CIS: 72355,171                          (407) 657-1300