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explicitly load a MFC extension DLL that exports a CObject derived class?
Posted on 2001-09-08
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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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...
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...
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
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
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...
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...
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(e
return;
else if (uReason == DLL_PROCESS_DETACH)
AfxTermeExtensionModule(ex
}
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...
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(e
return;
else if (uReason == DLL_PROCESS_DETACH)
AfxTermeExtensionModule(ex
}
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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