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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.

Introduction

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:

extern "C" AFX_EXTENSION_MODULE ExtensionDLL;
class DllInstanceSwitcher
{
public:
    DllInstanceSwitcher()
    {
        m_hInst = AfxGetResourceHandle();
        AfxSetResourceHandle(ExtensionDLL.hResource);
    }

    ~DllInstanceSwitcher()
    {
        AfxSetResourceHandle(m_hInst);
    }

private:
    HINSTANCE m_hInst;
};

#define SWITCH_RESOURCE  DllInstanceSwitcher __SwitchInstance;

Also we need to replace declaration of:

static AFX_EXTENSION_MODULE someDLL = { NULL, NULL }

with

extern "C" AFX_EXTENSION_MODULE ExtensionDLL = { NULL, NULL }

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

License

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About the Author

Peredelsky Alexey
Web Developer
Russian Federation Russian Federation
No Biography provided

Comments and Discussions

 
Generalhelp Pinmemberguyuewuhua24-Sep-09 19:43 
it is what i find,but i really don't know how to use,please help me!!
GeneralMy vote of 1 PinmemberKarstenK23-Nov-08 20:54 
Questionshort example code? PinmemberAnton Heidelwalder9-Nov-04 3:13 
AnswerRe: short example code? Pinmemberdickey wong29-Aug-05 9:03 
GeneralHi, Problems with MFC in a DLL PinmemberBeginnerOnline4-Dec-02 0:23 
Generalthanks a lot PinsussAnonymous8-Oct-02 3:27 
GeneralCommand ID's PinmemberPeredelsky Alexey14-Aug-02 2:33 
GeneralExtension DLL resource management PinmemberGary R. Wheeler20-Jul-02 7:45 
GeneralRe: Extension DLL resource management PinsussMichael Kuelshammer21-Jul-02 0:52 
GeneralRe: Extension DLL resource management PinmemberPeredelsky Alexey21-Jul-02 20:26 
GeneralExample code needed PinsussMichael Kuelshammer20-Jul-02 7:16 
GeneralRe: Example code needed PinmemberPeredelsky Alexey21-Jul-02 20:33 
GeneralThat's useful! PinmemberPhilip Patrick19-Jul-02 20:06 
GeneralI think it will not work in Win 98 & Me Pinmembermuayyad19-Jul-02 3:21 
GeneralRe: I think it will not work in Win 98 & Me PinmemberCraig Henderson19-Jul-02 4:01 
GeneralRe: I think it will not work in Win 98 & Me PinmemberPeredelsky Alexey19-Jul-02 4:25 
GeneralNice solution PinmemberRoger Allen19-Jul-02 2:58 

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