question on resource only DLL

edwardlau@hactl.com.hk
Tuesday, July 23, 1996

     Environment: VC++ 4.0 under Win 95
     
     I have built a resource only DLL. What it has included is a string 
     table only. How can I specify to use the string resource in the DLL 
     instead of the project's own? Do I have to declared something external 
     for I encounter undeclared identifier when compiled? Moreover, can I 
     use the project's own resource in addition to the DLL's?? 
     
     Thanks....
     
     Edward, PEI, edwardlau@hactl.com.hk

---

Bruce R. Cochran -- brc@colossus.Storz.Com
Friday, July 26, 1996

[Mini-digest: 3 responses]

     Environment: VC++ 4.2 under Win 95

To load the resource file you need to get a handle to the resource only dll and
use the AfxSetResourceHandle routine to set this file to be used as the one
for the resources.(like shown below)

   HINSTANCE m_hResource;           // handle to resource file

            m_hResource = LoadLibrary("Your dll");
            AfxSetResourceHandle(m_hResource);	// use this file for resources
            FreeLibrary(m_hResource);

     If you call AfxSetResourceHandle with NULL as the handle it will use the
projects resources.


----------
From: 	edwardlau@hactl.com.hk[SMTP:edwardlau@hactl.com.hk]
Sent: 	Tuesday, July 23, 1996 5:12 AM
To: 	mfc-l@netcom.com
Subject: 	question on resource only DLL

     Environment: VC++ 4.0 under Win 95
     
     I have built a resource only DLL. What it has included is a string 
     table only. How can I specify to use the string resource in the DLL 
     instead of the project's own? Do I have to declared something external 
     for I encounter undeclared identifier when compiled? Moreover, can I 
     use the project's own resource in addition to the DLL's?? 
     
     Thanks....
     
     Edward, PEI, edwardlau@hactl.com.hk

-----From: David.Lowndes@bj.co.uk

Edward,

You don't say what undeclared id's you're getting!

You can use your application's resources as well as the DLL's.

I assume you're using an MFC application If so, you need to ensure that
you save the instance handle of the DLL so that when you want to use a
resource in the DLL you switch to using that instance handle rather than
the one of your application.

Have a look at TN033 in the on-line help. Here's a snippet from it:

"If you wish to only load resources from a specific place, use the APIs
AfxGetResourceHandle and AfxSetResourceHandle to save the old handle
and set the new handle. Be sure to restore the old resource handle before
you return to the client application. The sample TESTDLL2 uses this
approach for explicitly loading a menu."

Dave Lowndes

-----From: wayne.dengel@octel.com

     I did it by putting the following in InitInstance in TheApp
     
     if(_access("Language.DLL",00)==0){
        MessageBox(NULL,"Loading Extension Language DLL","START-UP",MB_OK);
        AfxSetResourceHandle(AfxLoadLibrary("Language.DLL"));
     }

        From this point on ALL resources come from this DLL, if a resource is 
called that does NOT exist, then it comes from the standard RESOURCE in the 
project itself.

Hope this helps.

Wayne

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Vincent Mascart -- 100425.1337@compuserve.com
Tuesday, July 30, 1996

>From: 	Bruce Cochran
>Sent: 	lundi 29 juillet 1996 10:07
>To: 	"'mfc-l@netcom.com'"
>Subject: 	RE: question on resource only DLL
>
>     Environment: VC++ 4.2 under Win 95
>
>[snpi]
>
>     If you call AfxSetResourceHandle with NULL as the handle it will use the
>projects resources.

Maybe that's true with VC++ 4.2,  but previous versions of VC++ will assert.
Since I don't have VC ++ 4.2, I couldn't verify if it assert or not.

Maybe is it worth to check it ...

Vincent Mascart
100425.1337@compuserve.com

---

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