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

Beginner MFC - How to use functions from a .dll file in program?

Posted on 2004-03-29
Last Modified: 2013-11-20
Started to try and learn C++ and MFC. I'm a total beginer. I have the following code that creates a simple 200x200 window and shows it. I retyped it so it may have a syntax error somewhere. This code is all in one file MFC.cpp

#include <afxwin.h>

class COurApp: public CWinApp
      virtual BOOL InitInstance();

class COurWnd: public CFrameWnd
            CRect rect(0, 0, 200, 200);
            ASSERT(rect.Width() == 200);
            ASSERT(rect.Height() == 200);


BOOL COurApp::InitInstance(void)
      m_pMainWnd = new COurWnd;
      return TRUE;

COurApp AnApplication;

How do I call functions in a .dll file to use in this progam? I assume I must use a #include<header.h> file. Where would I put the function call in the above MFC program if I want to call it right after the progarm starts.

The function I'm interested in is TWAIN_AcquireNative(0,0) from the EZTW32.dll. I have the EZTWAIN.h file but don't know if I need some other files as well. Wan't to take the acquired image and draw it in this window.

Thanks for any help

Question by:cshorey
  • 2
LVL 48

Expert Comment

ID: 10703304
Include EZTWAIN.h to the file from which you want to call Dll functions. Add EZTWAIN.lib file to project linker list (Project - Settings - Link - Additional libraries). After this you can call functions from this Dll.

Author Comment

ID: 10703351
O.K., can I do something like this in the InitInstance(void).....
BOOL COurApp::InitInstance(void)
HANDLE myhandle;
myhandle = TWAIN_AcquireNative(0,0);

     m_pMainWnd = new COurWnd;
     return TRUE;

EZTWAIN claims it returns a handle to a windows dib. TWAIN_FreeNative lets it go when all through.

LVL 48

Accepted Solution

AlexFM earned 500 total points
ID: 10703606
Sure you can do this.

Featured Post

Free Tool: Postgres Monitoring System

A PHP and Perl based system to collect and display usage statistics from PostgreSQL databases.

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

Suggested Solutions

Title # Comments Views Activity
Unix / Linux grid computing 5 163
set up trigger (or something) to rename files (starting with ATL) in a linux directory 6 55
Hibernate methods 2 77
sumHeights2  challenge 7 114
Introduction: Ownerdraw of the grid button.  A singleton class implentation and usage. Continuing from the fifth article about sudoku.   Open the project in visual studio. Go to the class view – CGridButton should be visible as a class.  R…
Introduction: Hints for the grid button.  Nested classes, templated collections.  Squash that darned bug! Continuing from the sixth article about sudoku.   Open the project in visual studio. First we will finish with the SUD_SETVALUE messa…
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.

840 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