DLLs Again
tcatchick@aesprodata.com.au
Friday, December 06, 1996
Environment: VC++ 1.52, Win3.1, Win95.
Looks like I didn't conform to a standard the first time I sent the
message, so apologies for those offended.
I you didn't read my previous question here it comes again!
If any can help me, I would like to know how to place C++ code into a
DLL.
Hopefully its a simple solution.
Thanks in advance.
Theron. C.
Email tcatchick@aesprodata.com.au
Mike Blaszczak -- mikeblas@nwlink.com
Sunday, December 08, 1996
[Mini-digest: 4 responses]
At 10:36 12/6/96, tcatchick@aesprodata.com.au wrote:
> Environment: VC++ 1.52, Win3.1, Win95.
> If any can help me, I would like to know how to place C++ code into a
> DLL.
Compile it. Take the OBJs and link it into a DLL.
There are lots of books which show how; even right within the product, there's
a sample called DLLHUSK which shows how to do it.
> Hopefully its a simple solution.
Your question is very vague.
.B ekiM
http://www.nwlink.com/~mikeblas/
I'm afraid I've become some sort of speed freak.
These words are my own. I do not speak on behalf of Microsoft.
-----From: "Jorge Monteiro"
Theron,
Is your problem putting C++ code inside a Dll or accessing it from a client
application?
I suppose your problem is accessing it outside the dll (or getting the dll
compiled and linked without errors).
Here are two possibilities:
- simply use _export between the class declarator and the class name
ex: class _export MyClass { ... };
This works fine if but forces you to also _export all the superclasses (and
sometimes that's impossible)
- use the C++ name mangling in the EXPORTS statement of your *.DEF file.
The name mangling is almost impossible to understand so I suggest you to
start by your compiler generated map file and copy the operations of your
classes one at a time to your def file.
NOTE: If you want I have a small app that do this for you. You must only
state the name of the class to export.
If you what the app please request it directly to my e-mail.
Regards,
Jorge Monteiro
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----------
> From: tcatchick@aesprodata.com.au
> To: mfc-l@netcom.com
> Subject: DLLs Again
> Date: Sexta-feira, 6 de Dezembro de 1996 10:36
>
>
> Environment: VC++ 1.52, Win3.1, Win95.
>
> Looks like I didn't conform to a standard the first time I sent the
> message, so apologies for those offended.
>
> I you didn't read my previous question here it comes again!
>
> If any can help me, I would like to know how to place C++ code into
a
> DLL.
>
> Hopefully its a simple solution.
>
> Thanks in advance.
>
> Theron. C.
>
> Email tcatchick@aesprodata.com.au
-----From: Bill Berry
Export a c funtion. Here's an example.
Note: You need to pass back a safe array in the argument if you want this to work with Visual Basic.
e.g. TCHAR** ppszFileList would be FPSAFEARRAY* fppsaFileList.
#ifdef CFILELIST_EXPORT
// The following is a sample interface for C programs using C++ classes; the function GetFileList is
// an exported c call.
//
// The C++ classes used are CString and CFileList ( a non-MFC class ).
//
extern "C" {
#include
_declspec(dllexport) BOOL GetFileList( const TCHAR* pszSearchString, UINT uStyle, TCHAR** ppszFileList )
{
CString csz = (CString)pszSearchString;
_ASSERT( !csz.IsEmpty() );
if ( csz.IsEmpty() )
return FALSE;
if ( 0 == uStyle )
uStyle = DEFAULT_SEARCH;
CFileList FileList;
LONG lItems = FileList.Create( csz, uStyle );
if ( !lItems )
return FALSE;
ppszFileList = (TCHAR**)malloc( (lItems+1)*sizeof(TCHAR**) );
if ( NULL == ppszFileList ) {
MessageBox( NULL, OUT_OF_MEMORY, "Error", MB_ICONERROR | MB_OK );
return FALSE;
}
INT n = 0; // counter for actual items added to ppszFileList
for ( INT i = 0; i < lItems; i++) {
csz = FileList.GetPathName(i);
ppszFileList[n++] = (TCHAR*)_strdup( (const char*)csz );
}
ppszFileList[n] = NULL;
return TRUE;
}
#pragma auto_inline(on)
_declspec(dllexport) void FreeFileList( TCHAR* pszFileList ) { free( pszFileList ); }
#pragma auto_inline(off)
} // if defined extern "C"
#endif // if defined CFILELIST_EXPORT
----------
From: tcatchick@aesprodata.com.au
Sent: Friday, December 06, 1996 5:36 AM
To: mfc-l@netcom.com
Subject: DLLs Again
Environment: VC++ 1.52, Win3.1, Win95.
Looks like I didn't conform to a standard the first time I sent the
message, so apologies for those offended.
I you didn't read my previous question here it comes again!
If any can help me, I would like to know how to place C++ code into a
DLL.
Hopefully its a simple solution.
Thanks in advance.
Theron. C.
Email tcatchick@aesprodata.com.au
-----From: Ash Williams
There's a wealth of info on this list about what you want (which is a
microsoft extention dll). Here's a summary:
1) [setup]
You need to create a new 'MFC AppWizard(dll)' project and select the
MFC Extention Dll radio button.
2) [setup]
Make a file called modeMyDll.h, say, coded thus:
#ifndef modeMyDllFile
#define modeMyDllFile
#ifdef exportMyDll
#define modeMyDll _declspec( dllexport )
#else
#define modeMyDll _declspec( dllimport )
#endif
#endif
3) [setup]
In your compiler options, add 'exportMyDll' to the preprocessor
definitions.
4) [including your code]
Create classes as you would in any other project, but declare your
classes like so:
#include "modeMyDllFile.h"
class modeMyDllFile SomeClass { .. };
Do not use AFX_EXT_CLASS whatever you do, pretend you've never heard of
it!
5) REBUILD ALL
6) [using your dll]
In an exe project, simply insert the generated lib into your project
and make sure the generated dll can be found (eg in win95/system or
along side your exe). In a dll project just include the lib.
Search the list to see reasons why and also tips on changing the
generated names for the lib and dll.
Good luck, Ash
Shaju Mathew -- shajum@hpptc51.rose.hp.com
Tuesday, December 10, 1996
#define DllExport _declspec(dllexport)
class DllExport CMyMailSlot
{
protected:
CHAR mailslot_name[MAX_MAILSLOT_NAMESIZ + 1];
HANDLE hMailSlot;
public:
CMyMailSlot(LPCSTR lpMailSlotName,DWORD maxMsgSiz);
~CMyMailSlot();
INT NumMsgs(VOID);
INT GetNextMsg(LPSTR lpMsg,UINT maxChars); //destructive get
INT SendMsg(LPCSTR lpDestMailSlot,LPCSTR lpMsg);
};
Hope this helps you...
>
>
> Environment: VC++ 1.52, Win3.1, Win95.
>
> Looks like I didn't conform to a standard the first time I sent the
> message, so apologies for those offended.
>
> I you didn't read my previous question here it comes again!
>
> If any can help me, I would like to know how to place C++ code into a
> DLL.
>
> Hopefully its a simple solution.
>
> Thanks in advance.
>
> Theron. C.
>
> Email tcatchick@aesprodata.com.au
>
--
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