Solved

Loading DLLs and Libraries

Posted on 1998-05-10
4
235 Views
Last Modified: 2010-04-10
What exactly is loading a library and DLL. how Do I go about doing it in C++ ?
0
Comment
Question by:unagsr02
  • 3
4 Comments
 
LVL 22

Accepted Solution

by:
nietod earned 20 total points
ID: 1175420
answer coming.
0
 
LVL 22

Expert Comment

by:nietod
ID: 1175421
Loading a library and loading a DLL is a the same thing (A DLL is a library in windows.)  You can explicitly load a DLL using the windows API procedure LoadLibrary().  This takes a single parameter that is the disk name of the DLL to be loaded.  (If you don;t specify a path, windows will look for the DLL in several directories that tend to have DLLs)  The procedure returns a handle to the DLL.  The handle is a meaningless value to your program, but you can use it as a parameter in some of the windows API procedures (It is not meaningless to windows--it identifies the DLL to windows).

continued.
0
 
LVL 22

Expert Comment

by:nietod
ID: 1175422
One important procedure you can use the DLL handle with is the GetProcAddress() windows API procedure.  This procedure takes the handle to the DLL that you loaded and  the name (or number) of a procedure in the DLL and returns a pointer to that procedure.  You can then use the pointer to call the procedure.  (Without this procedure, loading DLL's would be useless.)

Another important procedure is FreeLibrary().  When you are done with a DLL, you use FreeLibrary() to release the DLL.

I hope this helps.  Ask if you have additional questions.
0
 

Author Comment

by:unagsr02
ID: 1175423
Hello, Thanks For Your Answer... This makes it pretty clear and i accept your answer
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

When writing generic code, using template meta-programming techniques, it is sometimes useful to know if a type is convertible to another type. A good example of when this might be is if you are writing diagnostic instrumentation for code to generat…
In days of old, returning something by value from a function in C++ was necessarily avoided because it would, invariably, involve one or even two copies of the object being created and potentially costly calls to a copy-constructor and destructor. A…
The goal of the video will be to teach the user the difference and consequence of passing data by value vs passing data by reference in C++. An example of passing data by value as well as an example of passing data by reference will be be given. Bot…
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

930 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now