C / C++ / MFC

MFC extention DLL problem

24-Jul-02 1:30

See :-

http://www.codeproject.com/dialog/pretransdialog01.asp

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: Key Press Messages

Atlence24-Jul-02 5:34

Atlence

24-Jul-02 5:34

Thanks you, but I don't use MFC. I'm programming with the Win32 API. Is there an equivalent to the PreTranslateMessage in Win32 API?

Thks in advance!
Appstmd

Raphael Kindt24-Jul-02 0:03

24-Jul-02 0:03

Hi,
Strange problem... I've constructed a dll (mfc extention) with VC++ 6.0 for another application that use it.
The project of this DLL use 2 files added:
ExportFile.h and ExportFile.cpp
where we can found for ExportFile.h:

#ifndef __EXPORTFILE_H_
#define __EXPORTFILE_H_

#define DLLEXPORT _declspec(dllexport)
typdef struct {
   BYTE member1;
   BYTE member2;
   //[... other member...]
} TCHA_DIG;
DLLEXPORT DWORD Init(TCHA_DIG* channel);
//[... other DLLEXPORT...]
DLLEXPORT void  StartAcquisition(TCHA_DIG channel);

#endif

And for ExportFile.cpp

#include "stdafx.h"
#include "ExportFile.h"

DWORD Init(TCHA_DIG* channel)
{
   // No code fore simplify debug
   return 0;
}
//[idem for the others functions (with no code)]

Ther's no error and no linking problem when I compile this project
The application (which use this DLL) use the file MyProject.lib and ExportFile.h well (the settings are good).
The problem is as follows:
when I start the application (which use the DLL) a message box tell me

"The entry point for ?StartAcquisition@@YAXPAUTCHA_DIG@@@Z procedure was not found in the Dynamic Linking Library MyDLL.DLL"

But, the most strange is that all is OK on my OTHER PC...(the 2 PC work with win2k and VC++ 6.0)

Please help me... thanks in advance...

Hello World!!! Smile | :)

from Raphaël

Anonymous24-Jul-02 0:53

Anonymous

24-Jul-02 0:53

Maybe (and if thats not the case I apologize), but maybe you have at the Application directory an older version of the Dll you once developed. check if the app is looking for the right dll and the right lib.

Guy.

Raphael Kindt24-Jul-02 2:31

24-Jul-02 2:31

Of course... Thanks for this answer...

Hello World!!! Smile | :)

from Raphaël

[CoY0te]24-Jul-02 1:17

[CoY0te]

24-Jul-02 1:17

As far as I know, if You put function declaration in the .h file, but don't place it's definition in a .cpp file the likner and the compiler will not report any error unless You try to use this function somewhere.
I assume You have the code for StartAcquisition in Your .cpp file (at least an empty function) ?
If yes, then I'm surprized with that "no entry point" too. Cool | :cool:

Railgun is like a Gilette Mach 3 - it does the job with one, easy stroke.

Raphael Kindt24-Jul-02 2:38

24-Jul-02 2:38

The problem comes owing to the fact that I left an old version of this DLL.
Moreover, I used the new lib file generate (and the old dll)...

Thanks nevertheless... Big Grin | :-D

Hello World!!! Smile | :)

from Raphaël

Dudi Avramov24-Jul-02 2:32

Dudi Avramov

24-Jul-02 2:32

Use extern "C" :

extern "C"
{
DLLEXPORT DWORD Init(TCHA_DIG* channel);
//[... other DLLEXPORT...]
DLLEXPORT void StartAcquisition(TCHA_DIG channel);
}

Raphael Kindt24-Jul-02 2:42

maximum storage in int variables

24-Jul-02 2:42

I often heard about this syntax but which are its advantages???
I observed with this syntax another arrangement of the *.lib file... Why???
Thanks...

Hello World!!! Smile | :)

from Raphaël

asif m@hmood23-Jul-02 23:33

asif m@hmood

23-Jul-02 23:33

how can i store 30 digits number in an int variable. if it is possible, then plz help me regarding this problem.

Nish Nishant24-Jul-02 0:04

24-Jul-02 0:04

Not in an int, unfortunately which is a 32 bit number.

Use an __int64 [max - 18,446,744,073,709,551,615] (20 digits)

Nish

p.s. for 30 digits, you'd have to create your own class or struct!

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Anonymous24-Jul-02 1:43

Anonymous

24-Jul-02 1:43

how to use that (__int64), it's not a data type, plz reply

Nish Nishant24-Jul-02 2:03

24-Jul-02 2:03

You'll need the new Platform SDK or VC++.NET

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Tomasz Sowinski24-Jul-02 2:11

Tomasz Sowinski

24-Jul-02 2:11

No, __int64 is a native (but non-standard) datatype available in VC6 as well.

Tomasz Sowinski -- http://www.shooltz.com

- It's for protection
- Protection from what? Zee Germans?

Nish Nishant24-Jul-02 2:41

24-Jul-02 2:41

Tomasz Sowinski wrote:
No, __int64 is a native (but non-standard) datatype available in VC6 as well.

Oh, sorry!

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Daniel Lohmann24-Jul-02 23:01

Daniel Lohmann

24-Jul-02 23:01

Nishant S wrote:
You'll need the new Platform SDK or VC++.NET

Sure?

I use it since good old Visual C++ 4.x day...

Confused | :confused:

--

Daniel Lohmann

http://www.losoft.de

Nish Nishant24-Jul-02 23:29

24-Jul-02 23:29

Daniel Lohmann wrote:
Sure?

Sorry for the wrong info Frown | :-(

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

benjymous24-Jul-02 2:40

benjymous

24-Jul-02 2:40

Do you actually need to do mathematical operations on this number, or is it just to store it. If you just need to store, then you could put it in a string or char array

--
Help me! I'm turning into a grapefruit!

KarstenK24-Jul-02 3:05

KarstenK

24-Jul-02 3:05

Do you want to store a telephone number or similar why don´t you use a string or as mentioned a selfwritten class, where you can define some operations as comparesion.

Have a lot of fun Big Grin | :-D