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Posted 18 Jul 2002

DllInstanceSwitcher class for switching to MFC Extension DLL resources

, 18 Jul 2002
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AFX_MANAGE_STATE(AfxGetStaticModuleState()) results in an error. This is the solution to the problem.


Some time ago I wrote an MFC Extension DLL. This DLL contained CMDIFrameWnd derived class with CToolbar placed on it. After dynamically loading this DLL into main application I saw that toolbar tool-tip strings loaded from the main application resources, because they have string IDs equal to DLL strings IDs.

Macro AFX_MANAGE_STATE(AfxGetStaticModuleState()) doesn't work because Microsoft don't want us to use it.

The solution is to write own resource switcher class and create it everywhere we need to use Extension DLL resources. Here is the code of this class:

class DllInstanceSwitcher
        m_hInst = AfxGetResourceHandle();


    HINSTANCE m_hInst;

#define SWITCH_RESOURCE  DllInstanceSwitcher __SwitchInstance;

Also we need to replace declaration of:




And all we need is to insert SWITCH_RESOURCE; everywhere we want to use DLL resources.


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About the Author

Peredelsky Alexey
Web Developer
Russian Federation Russian Federation
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Comments and Discussions

Generalhelp Pin
guyuewuhua24-Sep-09 20:43
memberguyuewuhua24-Sep-09 20:43 
GeneralMy vote of 1 Pin
KarstenK23-Nov-08 21:54
memberKarstenK23-Nov-08 21:54 
Questionshort example code? Pin
Anton Heidelwalder9-Nov-04 4:13
memberAnton Heidelwalder9-Nov-04 4:13 
AnswerRe: short example code? Pin
dickey wong29-Aug-05 10:03
memberdickey wong29-Aug-05 10:03 
GeneralHi, Problems with MFC in a DLL Pin
BeginnerOnline4-Dec-02 1:23
memberBeginnerOnline4-Dec-02 1:23 
Generalthanks a lot Pin
Anonymous8-Oct-02 4:27
sussAnonymous8-Oct-02 4:27 
GeneralCommand ID's Pin
Peredelsky Alexey14-Aug-02 3:33
memberPeredelsky Alexey14-Aug-02 3:33 
GeneralExtension DLL resource management Pin
Gary R. Wheeler20-Jul-02 8:45
memberGary R. Wheeler20-Jul-02 8:45 
GeneralRe: Extension DLL resource management Pin
Michael Kuelshammer21-Jul-02 1:52
sussMichael Kuelshammer21-Jul-02 1:52 
GeneralRe: Extension DLL resource management Pin
Peredelsky Alexey21-Jul-02 21:26
memberPeredelsky Alexey21-Jul-02 21:26 
For last year I've been writing an application with number of extension DLL's and using the method you explained (set different ID's for different DLL's). So, it's very difficult to support such app, because we need to control every ID in every DLL.

"...If you use the CDynLinkLibrary() constructor to link your extension DLL into the DLL user's resource chain, then your DLL 'shares' the resource space with the calling application..."
That means that application uses union resource space. But we can simply change resource context to only DLL resources and access only them (not all application and other DLL resources).
GeneralExample code needed Pin
Michael Kuelshammer20-Jul-02 8:16
sussMichael Kuelshammer20-Jul-02 8:16 
GeneralRe: Example code needed Pin
Peredelsky Alexey21-Jul-02 21:33
memberPeredelsky Alexey21-Jul-02 21:33 
GeneralThat's useful! Pin
Philip Patrick19-Jul-02 21:06
memberPhilip Patrick19-Jul-02 21:06 
GeneralI think it will not work in Win 98 & Me Pin
muayyad19-Jul-02 4:21
membermuayyad19-Jul-02 4:21 
GeneralRe: I think it will not work in Win 98 & Me Pin
Craig Henderson19-Jul-02 5:01
memberCraig Henderson19-Jul-02 5:01 
GeneralRe: I think it will not work in Win 98 & Me Pin
Peredelsky Alexey19-Jul-02 5:25
memberPeredelsky Alexey19-Jul-02 5:25 
GeneralNice solution Pin
Roger Allen19-Jul-02 3:58
memberRoger Allen19-Jul-02 3:58 

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