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DllInstanceSwitcher class for switching to MFC Extension DLL resources

, 18 Jul 2002 90.4K 35
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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

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Comments and Discussions

 
Generalhelp Pin
guyuewuhua24-Sep-09 19:43
memberguyuewuhua24-Sep-09 19:43 
GeneralMy vote of 1 Pin
KarstenK23-Nov-08 20:54
memberKarstenK23-Nov-08 20:54 
Questionshort example code? Pin
Anton Heidelwalder9-Nov-04 3:13
memberAnton Heidelwalder9-Nov-04 3:13 
AnswerRe: short example code? Pin
dickey wong29-Aug-05 9:03
memberdickey wong29-Aug-05 9:03 
GeneralHi, Problems with MFC in a DLL Pin
BeginnerOnline4-Dec-02 0:23
memberBeginnerOnline4-Dec-02 0:23 
Hi, I have a problem, Cry | :((
I've done a DLL, that is inherited from CDialog. It build up itsself his own Dialog.
The whloe time I included the classes and make an Object of them.
So I could use the inherited function. But nowadays I have to build up a DLL.
How can I use the inherited functions from CDialog ?

A Pointer in the DLL have I, but no Handle to the CWNd object . . .
this = 0x34093049 CWnd (hnwd = 0000000000) ???

Can anybody help me . . .

All functions that I start in the DLL like MoveWindow() . . . return an Access Violation

Thanx
BeginnerOnline
Generalthanks a lot Pin
Anonymous8-Oct-02 3:27
sussAnonymous8-Oct-02 3:27 
GeneralCommand ID's Pin
Peredelsky Alexey14-Aug-02 2:33
memberPeredelsky Alexey14-Aug-02 2:33 
GeneralExtension DLL resource management Pin
Gary R. Wheeler20-Jul-02 7:45
memberGary R. Wheeler20-Jul-02 7:45 
GeneralRe: Extension DLL resource management Pin
Michael Kuelshammer21-Jul-02 0:52
sussMichael Kuelshammer21-Jul-02 0:52 
GeneralRe: Extension DLL resource management Pin
Peredelsky Alexey21-Jul-02 20:26
memberPeredelsky Alexey21-Jul-02 20:26 
GeneralExample code needed Pin
Michael Kuelshammer20-Jul-02 7:16
sussMichael Kuelshammer20-Jul-02 7:16 
GeneralRe: Example code needed Pin
Peredelsky Alexey21-Jul-02 20:33
memberPeredelsky Alexey21-Jul-02 20:33 
GeneralThat's useful! Pin
Philip Patrick19-Jul-02 20:06
memberPhilip Patrick19-Jul-02 20:06 
GeneralI think it will not work in Win 98 & Me Pin
muayyad19-Jul-02 3:21
membermuayyad19-Jul-02 3:21 
GeneralRe: I think it will not work in Win 98 & Me Pin
Craig Henderson19-Jul-02 4:01
memberCraig Henderson19-Jul-02 4:01 
GeneralRe: I think it will not work in Win 98 & Me Pin
Peredelsky Alexey19-Jul-02 4:25
memberPeredelsky Alexey19-Jul-02 4:25 
GeneralNice solution Pin
Roger Allen19-Jul-02 2:58
memberRoger Allen19-Jul-02 2:58 

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