|
Of course. Define your function as follows:
extern "C" __declspec(dllexport) int <font color=#ff0000>WINAPI</font> Maximum(int a,int b) If you're curious about that WINAPI thing, have a look at Nemanja Trifunovic's Calling Conventions Demystified
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
I tried to do it, and it didn't work, so do you have any other suggestion, because i'm lost 
|
|
|
|
|
Try to add the .def file, in it you can define the function to export. Sometimes VB can't access to the function.
How you are declaring the function un VB or vba??
Regards...
Carlos Antollini.
Sonork ID 100.10529 cantollini
"There is an old saying that if a million monkeys typed on a million keyboards for a million years, eventually all the works of Shakespeare would be produced. Now, thanks to Usenet, we know this is not true."
|
|
|
|
|
i do it in vba. does it change sthg for the first thing you said?
regards
|
|
|
|
|
I need to know how you are declaring the function in vba.....
Regards
Carlos Antollini.
Sonork ID 100.10529 cantollini
|
|
|
|
|
After the definition in VC++ i put the following code in vba:
Public Declare Function Maximun Lib "D:\essai2\Debug\essai2.dll"(byval a as integer,byval b as integer) as integer
I have put it into a simple module, without anything else.
So, if you need of information on the code in "C", you could look at my first post.
thanks
|
|
|
|
|
Gérald Mercet wrote:
Public Declare Function Maximun Lib "D:\essai2\Debug\essai2.dll"(byval a as integer,byval b as integer) as integer
Change the Integer by Long...
Regards....
Carlos Antollini.
Sonork ID 100.10529 cantollini
|
|
|
|
|
i've done it and it doesn't work yet. What do you think about my way of doing for this dll application perhaps i've forgotten sthg in the procedure?
i think that sthg completly stupid have been forgotten, but i don't know what!
thanks
|
|
|
|
|
Gerald, please send me your code...
Regards
Carlos Antollini.
Sonork ID 100.10529 cantollini
|
|
|
|
|
I've just noticed you named the function Maximum in your C++ file and Maximun in your VB app. Is this a typo in the post or could it be the root of the problem?
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
you were right for the typo, i change it and it brought nothing into the way of no working of my application...
have you any other idea because i don't succeed in solving my pb?
|
|
|
|
|
How are you calling Maximum from VBA? From your fist post, seems like you're providing no arguments.
This has underwent so many changes that maybe it'd be a good idea to post again the (relevant) code in its current form.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
In my first post you could see thge following code :
Public Declare Function Maximun Lib "D:\essai2\Debug\essai2.dll"(byval a as integer,byval b as integer) as integer
In fact, in a vba project linked to an excel workbook, i put this code into a module window. And that's all i do. So, i don't know if answer properly to your question!?!
regards
|
|
|
|
|
I mean, when you actually invoke the function Maximum, how do you do it? Do you actually pass two numbers?
Also, your firs posts are probably obsolete by know (for instance, I guess you already corrected the Maximun/Maximum typo), so it'd be great if you repost the code in its actual form.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
Ok, i think that when you speak about invoking the function Maximum in VBA, it's to ask me how i use this function into another "sub or function", or how i do the declaration into vba? Because as i said below, i have only written into the module window the code the code you have read ("Public declare...") I didn't use any other function which call this routine, i call it directly from excel. Perhaps it's a mistake? And in excel, i put 2 values into 2 cells, for example, into A1 i put "2", and in A2, "5", so in another cell, i call the function Maximum thanks to the button "fx" in the toolbar. So, do i an error by proceeding like that?
thanks for your patience.
gerald
|
|
|
|
|
thanks for your patience.
No problem, we're building one of the most beatiful waterfall-like threads so far here in CP.
Well, please post your code (that is, the VBA import code and the C++ part) to see how it looks like now. Little help can be provided without that.
As for the means of invokation, in your particular scenario please locate the cursor on the cell where Maximum is invoked. At the upper area of Excel, just below the toolbars, you will have to see something like
=Maximum(A1;A2) Otherwise, you're probably calling your function the wrong way.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
Ok, as the app i test is for the moment just a test, the following code, called essai2.cpp, have only one function, "Maximum". (I have made sthg simple to learn first the syntax before doing sthg more complex)
So:
// essai2.cpp : Defines the initialization routines for the DLL.
//
#include "stdafx.h"
#include "essai2.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
//
// Note!
//
// If this DLL is dynamically linked against the MFC
// DLLs, any functions exported from this DLL which
// call into MFC must have the AFX_MANAGE_STATE macro
// added at the very beginning of the function.
//
// For example:
//
// extern "C" BOOL PASCAL EXPORT ExportedFunction()
// {
// AFX_MANAGE_STATE(AfxGetStaticModuleState());
// // normal function body here
// }
//
// It is very important that this macro appear in each
// function, prior to any calls into MFC. This means that
// it must appear as the first statement within the
// function, even before any object variable declarations
// as their constructors may generate calls into the MFC
// DLL.
//
// Please see MFC Technical Notes 33 and 58 for additional
// details.
//
/////////////////////////////////////////////////////////////////////////////
// CEssai2App
BEGIN_MESSAGE_MAP(CEssai2App, CWinApp)
//{{AFX_MSG_MAP(CEssai2App)
// NOTE - the ClassWizard will add and remove mapping macros here.
// DO NOT EDIT what you see in these blocks of generated code!
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CEssai2App construction
CEssai2App::CEssai2App()
{
// TODO: add construction code here,
// Place all significant initialization in InitInstance
}
/////////////////////////////////////////////////////////////////////////////
// The one and only CEssai2App object
CEssai2App theApp;
extern "C" __declspec(dllexport) int Maximum(int a,int b)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
int max;
if(a
|
|
|
|
|
Replace
extern "C" __declspec(dllexport) int Maximum(int a,int b) with
extern "C" __declspec(dllexport) int <font color=#ff0000>WINAPI</font> Maximum(int a,int b)
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
I have tried your suggestion without any success.
so in the vba code i've done a simple Sub, which only call the function Maximum and put the result into a excel's cell, as following:
///////////////////////////////////////////////////////////
Sub test22()
Cells(5, 5) = Maximum(2, 6)
End Sub
//////////////////////////////////////////////////////////
when i play it, i have the following error message:
(sorry but as my excel version is french, the error message is in english)
so:
"Entry point" Maximum of a dll which cannot be found in D:\essai2\Debug\essai2.dll.
Of course after this message, i have checked if the path was correct, and it was!!!
so, do you think that i'm unlucky
|
|
|
|
|
Ok, now I think we got it.
On the C++ part, leave it all as it is now (i.e., maintain the WINAPI thing, please).
On the VBA part, replace your declaration with the following:
Public Declare Function Maximum Lib "D:\essai2\Debug\essai2.dll" Alias "_Maximum@8" (Byval m1 as long,Byval m2 as long) as long I've tried it myself and it works, please tell me back if it did for you.
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
Et bien? (avec un air d'expectation)
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
Sorry for this later answer, but in my job i'm not a full-time programmer, so i have others things to do(conference...)
So, i tried your solution, and it didn't work at all, so i don't know what is wrong in my code or in sthg extern of the 2 environments. But, for the moment, i will try again checking if i haven't forgotten anything. So, before i will come back just a question, how do you find this solution, and what is this alias?
thanks a lot
|
|
|
|
|
just for information the C++ code and vba code:
//////VBA//////////////////////////////////////////////////
Public Declare Function Maximum Lib "D:\essai2\Release\essai2.dll" Alias "_Maximum@8" (ByVal m1 As Long, ByVal m2 As Long) As Long
Function test2(m As Long, n As Long)
test2 = Maximum(m, n)
If test2 = "" Then
test2 = 0
Else
test2 = test2
End If
End Function
Sub test22()
Cells(5, 5) = Maximum(2, 6)
//////C++/////////////////////////////////////////////////
/ essai2.cpp : Defines the initialization routines for the DLL.
//
#include "stdafx.h"
#include "essai2.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
//
// Note!
//
// If this DLL is dynamically linked against the MFC
// DLLs, any functions exported from this DLL which
// call into MFC must have the AFX_MANAGE_STATE macro
// added at the very beginning of the function.
//
// For example:
//
// extern "C" BOOL PASCAL EXPORT ExportedFunction()
// {
// AFX_MANAGE_STATE(AfxGetStaticModuleState());
// // normal function body here
// }
//
// It is very important that this macro appear in each
// function, prior to any calls into MFC. This means that
// it must appear as the first statement within the
// function, even before any object variable declarations
// as their constructors may generate calls into the MFC
// DLL.
//
// Please see MFC Technical Notes 33 and 58 for additional
// details.
//
/////////////////////////////////////////////////////////////////////////////
// CEssai2App
BEGIN_MESSAGE_MAP(CEssai2App, CWinApp)
//{{AFX_MSG_MAP(CEssai2App)
// NOTE - the ClassWizard will add and remove mapping macros here.
// DO NOT EDIT what you see in these blocks of generated code!
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CEssai2App construction
CEssai2App::CEssai2App()
{
// TODO: add construction code here,
// Place all significant initialization in InitInstance
}
/////////////////////////////////////////////////////////////////////////////
// The one and only CEssai2App object
CEssai2App theApp;
extern "C" __declspec(dllexport) int WINAPI Maximum(int a,int b)
{
AFX_MANAGE_STATE(AfxGetStaticModuleState());
int max;
if(a
|
|
|
|
|
What does "sthg" mean?
Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo
|
|
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
