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
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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.

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