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explicitly load a MFC extension DLL that exports a CObject derived class?

Posted on 2001-09-08
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Last Modified: 2013-11-20
Is it possible to explicitly load a MFC extension DLL that exports a CObject derived class?  The calling exe is an MFC app.  I have no problem doing this using a .lib file linking implicitly.  Can you please supply a small code sample.  
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Question by:Surfer
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Expert Comment

by:MRNMurthy
ID: 6468016
Hi,

I will try to send the code.

From

MRN Murthy
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Author Comment

by:Surfer
ID: 6468770
That would be great!  I look forward to your email.
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Author Comment

by:Surfer
ID: 6469022
That would be great!  I look forward to your email.
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Author Comment

by:Surfer
ID: 6469144
That would be great!  I look forward to your email.
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Expert Comment

by:cypherljk
ID: 6471835
Surfer,

What is that you can not do? Do you need to know how to load a dl explicitly or do you need to know how to export a MFC derived class in a dll?  If you explain a bit more we can help you.

My 2 cents...
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Author Comment

by:Surfer
ID: 6473242
The main part of my question is:

I have a class
AClass : poblic CObject
{
...
}
I want to export my class from my DLL to the calling app.  If I use implicit linking I know what to do.  However, if I link explicit, what is the best way to import this class into my exe?  I know who to use exlictt linking with functions, but how do I do it with a classes and is it safe?

Thanks
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Expert Comment

by:cypherljk
ID: 6475157
Surfer,

To export an entire class from a dll you must prefix the class with AFX_EXT_CLASS like so...
class AFX_EXT_CLASS AClass : public CObject
{
...
}


and of course your dll must be an MFC extension dll since you are subclassing CObject

My 2 cents...
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Author Comment

by:Surfer
ID: 6475178
How do I use explicit linking to call this class from my exe?
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Author Comment

by:Surfer
ID: 6475189
How do I use explicit linking to call this class from my exe?
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Author Comment

by:Surfer
ID: 6475190
How do I use explicit linking to call this class from my exe?
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Author Comment

by:Surfer
ID: 6475191
How do I use explicit linking to call this class from my exe?
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Accepted Solution

by:
cypherljk earned 200 total points
ID: 6475226
1.) Create an AFX_EXTENSION_MODULE object in your application i.e. the CWinApp derived object
ex.

static AFX_EXTENSION_MODULE extMyExtesnion;

2.) Call AfxLoadLibrary() passing in the name of your library

3.) Call the API function AfxInitExtensionModule() in your application's InitInstance() function passing it the address of your object in step 1 and and handle returned from step 2

4.) Add the following to your dll code in the dllmain
if (uReason == DLL_PROCESS_ATTACH)
{
    if (!AfxInitExtensionModule(extMyExtension, hInst)
        return;
    else if (uReason == DLL_PROCESS_DETACH)
        AfxTermeExtensionModule(extMyExtension);
}

5.) Call AfxFreeLibrary() passing in the handle to the library when you app exits

This will allow you to create a manages instance of the exported class object like a view etc etc.

My 2 cents...
       
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