We value your feedback.
Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!
COURSE of the MONTH
14 days, 22 hours left to enrollBecome a Premium Member and unlock a new, free course in leading technologies each month.
Solved
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.
[X]
Welcome to Experts Exchange
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
- Help others & share knowledge
- Earn cash & points
- Learn & ask questions
-
8
-
3
12 Comments
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...
Featured Post
Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.
One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
Introduction:
The undo support, implementing a stack.
Continuing from the eigth article about sudoku.
We need a mechanism to keep track of the digits entered so as to implement an undo mechanism. This should be a ‘Last In First Out’ collec…
In this post we will learn different types of Android Layout and some basics of an Android App.
This video will show you how to get GIT to work in Eclipse.
It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
Suggested Courses
Course of the Month14 days, 22 hours left to enroll
771 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.