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Exporting C++ classes without using MFC extension DLL

, 5 Jun 2002 213.8K 4.6K 49
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This article describes the process of exporting regular C++ classes without using MFC extension DLLs
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Introduction

DLLs are a great way of sharing common pieces of code data between applications. When it comes down to exporting C++ classes from DLLs most of us go for MFC extension DLLs where we can use the AFX_EXT_CLASS macro to export an entire class. Unfortunately, MFC is no lean and mean class architecture, which means that distributing MFC extension DLLs mean that you have to include the big MFC runtime not to mention the fact that your DLL can only be linked to MFC applications exclusively. What's the solution then? Enter standard Win32 DLLs.

Details

I couldn't believe my eyes on how easily one can export C++ classes directly from a plain vanilla Win32 DLL. Just make one and insert your classes into the DLL. Now simply put __declspec(dllexport) in between the class keyword and the class name, i.e.

// in your header...

class __declspec(dllexport) CDllTest
{
public:  
  CDllTest(){}
  ~CDllTest(){}

public:
  void SayHello();
};

// in your cpp...

void CDllTest::SayHello()
{
 printf(_T("Hello C++"));
}

That's it! The sample code and project are pretty self explanatory. Enjoy.

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

Tanzim Husain
Web Developer
United States United States
No Biography provided

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Comments and Discussions

 
Questiondll Pin
mouass29-Mar-15 22:42
membermouass29-Mar-15 22:42 
QuestionI got lilnker error LN2019 Pin
Vivek_Mendse10-Nov-11 18:52
memberVivek_Mendse10-Nov-11 18:52 
QuestionReally - that simple? Pin
Vaclav_Sal4-Feb-11 8:48
memberVaclav_Sal4-Feb-11 8:48 
You are using incorrect assumptions (per MSDN) when the DLL is used in conjunction with MFC application.
I say assumptions because you did not define that, therefore, your article is little misleading.
Per MSDN the macro usage depends on definition or no definitions of _AFXDLL and _AFXEXT.
I just followed you advice and replaced the macro AFX_EXT_CLASS with __declspec(dllexport) only to get the compiler   not to recognize MFC CWnd base class(!) I have only _AFXDLL defined, so it makes perfect sense.
GeneralUsing dll Pin
s_t_r_e_a_m_e_r18-Nov-07 1:19
members_t_r_e_a_m_e_r18-Nov-07 1:19 
QuestionHow can I use a class exported from a DLL by using LoadLibrary function Pin
zhoujinjun085827-Aug-07 4:22
memberzhoujinjun085827-Aug-07 4:22 
AnswerRe: How can I use a class exported from a DLL by using LoadLibrary function Pin
afriza2-Dec-08 16:44
memberafriza2-Dec-08 16:44 
GeneralGreat! Pin
docrob125-Jan-07 17:48
memberdocrob125-Jan-07 17:48 
Generaldelete cuases access violation Pin
tom cruz18-Aug-05 2:35
membertom cruz18-Aug-05 2:35 
GeneralRe: delete cuases access violation Pin
Igen19-Mar-09 7:14
memberIgen19-Mar-09 7:14 
Generalqn Pin
From_Nepal6-Jan-05 8:00
sussFrom_Nepal6-Jan-05 8:00 
GeneralLoad at runtime Pin
Verifier16-Apr-04 4:30
memberVerifier16-Apr-04 4:30 
GeneralRe: Load at runtime Pin
ThatsAlok20-Apr-06 22:32
memberThatsAlok20-Apr-06 22:32 
QuestionHow to create DllTest.dll and DllTest.lib in VC7.0 Pin
Sctt H. Chang31-Mar-04 10:11
memberSctt H. Chang31-Mar-04 10:11 
AnswerRe: How to create DllTest.dll and DllTest.lib in VC7.0 Pin
Anonymous17-Apr-04 23:26
sussAnonymous17-Apr-04 23:26 
Questionis it mean that regular DLL can replace extension DLL every time? Pin
dalink6-Mar-04 6:00
memberdalink6-Mar-04 6:00 
GeneralA slight correction and enhancement Pin
David Pritchard29-May-03 7:31
memberDavid Pritchard29-May-03 7:31 
Questionhow to insert a class from MFC to C# Pin
mosgeorge13-Apr-03 3:49
membermosgeorge13-Apr-03 3:49 
AnswerRe: how to insert a class from MFC to C# Pin
Tanzim Husain23-Apr-03 20:54
memberTanzim Husain23-Apr-03 20:54 
AnswerRe: how to insert a class from MFC to C# Pin
Takeru Koushirou27-Jun-04 21:31
memberTakeru Koushirou27-Jun-04 21:31 
GeneralRe: how to insert a class from MFC to C# Pin
charnos13-Aug-04 6:49
membercharnos13-Aug-04 6:49 
Generalany Info about Proxy DLL (Trojan DLL) Pin
bfadi5-Mar-03 10:24
memberbfadi5-Mar-03 10:24 
GeneralRe: any Info about Proxy DLL (Trojan DLL) Pin
Tanzim Husain23-Apr-03 21:14
memberTanzim Husain23-Apr-03 21:14 
GeneralRe: any Info about Proxy DLL (Trojan DLL) Pin
gypsySUN17-Oct-03 18:11
membergypsySUN17-Oct-03 18:11 
GeneralRe: any Info about Proxy DLL (Trojan DLL) Pin
bfadi18-Oct-03 20:42
memberbfadi18-Oct-03 20:42 
GeneralRe: any Info about Proxy DLL (Trojan DLL) Pin
gypsySUN21-Oct-03 5:27
membergypsySUN21-Oct-03 5:27 
GeneralRe: any Info about Proxy DLL (Trojan DLL) Pin
bfadi21-Oct-03 19:57
memberbfadi21-Oct-03 19:57 
QuestionIs your linking truly dynamic, or static? Pin
Lewis McCarthy20-Sep-02 10:12
sussLewis McCarthy20-Sep-02 10:12 
AnswerRe: Is your linking truly dynamic, or static? Pin
Jonte23-Oct-02 3:29
memberJonte23-Oct-02 3:29 
AnswerRe: Is your linking truly dynamic, or static? Pin
Takeru Koushirou27-Jun-04 21:39
memberTakeru Koushirou27-Jun-04 21:39 
AnswerRe: Is your linking truly dynamic, or static? Pin
afriza2-Dec-08 16:51
memberafriza2-Dec-08 16:51 
GeneralMultiple Classes Pin
GWG11-Jun-02 0:17
memberGWG11-Jun-02 0:17 
GeneralRe: Multiple Classes Pin
Tanzim Husain23-Apr-03 21:06
memberTanzim Husain23-Apr-03 21:06 
GeneralRe: Multiple Classes Pin
bad_source_bios24-Apr-03 10:31
memberbad_source_bios24-Apr-03 10:31 
GeneralRe: Multiple Classes Pin
Anonymous2-May-03 11:43
sussAnonymous2-May-03 11:43 
GeneralRe: Multiple Classes Pin
bad_source_bios2-May-03 12:24
memberbad_source_bios2-May-03 12:24 
GeneralTHAAAAANK YOU!! Pin
Rickard Andersson10-Jun-02 7:10
memberRickard Andersson10-Jun-02 7:10 
GeneralRe: THAAAAANK YOU!! Pin
Rickard Andersson10-Jun-02 7:12
memberRickard Andersson10-Jun-02 7:12 
GeneralA note about exporting template classes in VC++... Pin
Vincent Richard6-Jun-02 21:11
memberVincent Richard6-Jun-02 21:11 
GeneralAFX_EXT_CLASS Pin
Marc Richarme6-Jun-02 7:37
memberMarc Richarme6-Jun-02 7:37 
GeneralRe: AFX_EXT_CLASS Pin
Alexpro11-Jun-02 20:18
memberAlexpro11-Jun-02 20:18 
GeneralRe: AFX_EXT_CLASS Pin
Marc Richarme11-Jun-02 22:05
memberMarc Richarme11-Jun-02 22:05 

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