Re: Export Member function / class - C / C++ / MFC Discussion Boards

Re: Export Member function / class

David Crow24-Mar-05 5:43

David Crow

24-Mar-05 5:43

I've never had the need to export from an EXE, only from a DLL. Are you sure this is something you need/want?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Export Member function / class

Steve Messer24-Mar-05 7:01

Steve Messer

24-Mar-05 7:01

David,

I don't see away around it for what I am trying to accomplish.

Let me explain what I am trying to do and maybe it will make for sense.

My main application is just a framework that most useful functionality will be added thru plugins.
Each screen is described in XML and all communication is done by messages.

So, here is a simple example. The main application has a screen file that says it has two buttons on it. First a theme selector button which will call the theme.dll and exit button which sends a command to close the applcation. The Theme selector button will load the Theme selector dll which loads its own screen file which has the following information.

1) Theme name
2) Theme version
3) Theme author
4) List of screenshots
5) Next Button
6) Prev Button
7) Apply Button

Since the main application has no prior knowledge of this information the plugin must be responsible to maintaining and updating this data to the main application.

That is why I need my message function to be able to send data both directions.

bool OnMessage( CSystem *pSys, CMessage * pMsg );

The main application knows that the plugin registered the following controls:

1) 2 text controls
2) screenshot control
3) 3 buttons

In the main application the user presses the Theme Selector button. The theme plugin is loaded.

On the plugins screen the next button is pushed which sends a simple message to the plugin "theme.next"

OnMessage( CSystem *pSys, CMessage *pMsg )
{
   if( pMsg->GetSubject() == "theme.next")
   {
      // Send message back to main application
      // containing the information of the next theme in the list
      // My CMessage can contain lists of data which can't be send in
      // a normal windows message.
      // this is where I would like to call
      mainapplication->OnMessage( ... )
      
      // therefore this is why I want to export OnMessage from the main application
      // so the dll can repsond to messages from main.

   }

}

Hope that makes sense.

Re: Export Member function / class

cmk24-Mar-05 8:34

cmk

24-Mar-05 8:34

In your exe source:

#ifdef EXE_EXPORTS
#define EXE_API __declspec(dllexport)
#else
#define EXE_API __declspec(dllimport)
#endif

EXE_API bool OnMessage( CSystem *pSys, CMessage *pMsg )
{
...
return(true);
}

Define EXE_EXPORTS in the project settings when building the .exe.
This will export the function in the exe and create a .lib for the .exe when you build it.

For each plugin dll you need to include a header that defines the exported function(s) e.g. OnMessage(), and link the dll with the .exe's .lib file.

...cmk

Save the whales - collect the whole set

Re: Export Member function / class

Steve Messer24-Mar-05 8:41

Steve Messer

24-Mar-05 8:41

Okay,

But, can you get the name of function dynamically without including the .lib like you would get the address of a function in a dll.

Oh, does it matter if this function is a member function? Would you export it the same way?

Thanks,

Steve

Re: Export Member function / class

cmk24-Mar-05 10:17

cmk

24-Mar-05 10:17

smesser wrote:
But, can you get the name of function dynamically without including the .lib like you would get the address of a function in a dll.

You can use LoadLibrary() on an exe with exported functions; however first read all the MSDN remarks for LoadLibrary().

If you exported a c++ function or a class method you have to use the mangled name in GetProcAddress().

I am guessing that it would work. LoadLibrary() would see that the specified module (the exe) is already loaded into the process and not try and call DllMain() in it. Just remember to call FreeLibrary() as well to decrease the reference count for the module (exe).

smesser wrote:
Oh, does it matter if this function is a member function? Would you export it the same way?

You would export it as you would a member function from a dll.

That is, either export the entire class:

class EXE_API MyClass {
...
);

or just the method:

class MyClass {
...
EXE_API bool MyMethod( ... );
...
);

...cmk

Save the whales - collect the whole set

Re: Export Member function / class

cmk24-Mar-05 10:24

cmk

24-Mar-05 10:24

As David mentioned the more usual way is that the exe just calls known interfaces in the dll.

For you i would suggest a similar approach.
When the exe loads the dll have it call an Init() function that passes a pointer (or reference) for the App object to the dll, then the dll can just use that pointer (or reference) to call back to the exe. You don't need to use LoadLibrary() on the exe from the dll.

I get the impression that you want this as generic as possible, but at some point you have to tell each side how to talk to the other. Smile | :)

...cmk

Save the whales - collect the whole set

Re: Export Member function / class

Steve Messer24-Mar-05 13:21

Steve Messer

24-Mar-05 13:21

cmk wrote:
When the exe loads the dll have it call an Init() function that passes a pointer (or reference) for the App object to the dll, then the dll can just use that pointer (or reference) to call back to the exe. You don't need to use LoadLibrary() on the exe from the dll.

I tried something like that and I couldn't get it to compile. I tried the following:

// Set Pointer to CCOREDlg to g_System-----------------------------------------
HWND hCore;		
hCore = AfxGetApp()->m_pMainWnd->GetSafeHwnd();

CDialog* pDlg = DYNAMIC_DOWNCAST(CDialog, CWnd::FromHandlePermanent(hCore));
if (pDlg != NULL)
{
   CCOREDlg *pCore1;
   pCore1 = (CCOREDlg*)pDlg->GetRuntimeClass();

   CSystem * pSys = NULL;
   IMessage *pMsg = NULL;
   g_pSystem->pCore = pCore1;
   g_pSystem->pCore->OnMessage( pSys, pMsg );
}
//-------------------------------------------------------------------------

This code works fine from the exe but externally it complains that CCOREDlg is unknown.

Maybe I was doing something wrong??

cmk wrote:
I get the impression that you want this as generic as possible, but at some point you have to tell each side how to talk to the other.

Well, that is the crux of my dilemma. Communication to the dll is simple but the other direction is some what of a buggard.

Best case scenario for me would be to export the OnMessage function from the exe and then import it in the dll. But, I am a little fuzzy on the details for doing this.

Thanks for all the input.

Re: Export Member function / class

cmk24-Mar-05 20:49

cmk

24-Mar-05 20:49

smesser wrote:
This code works fine from the exe but externally it complains that CCOREDlg is unknown.
Maybe I was doing something wrong??

Yeah, maybe. Smile | :)

Here are two chunks that i whipped up to test things - it works.
- build the exe as a console application
- build the dll as a non-mfc dll
- exe project defines MYEXE_EXPORTS
- dll project defines MYDLL_EXPORTS
- build exe first, copy .lib file to dll project directory
- build dll, copy .dll file to exe output directory (Debug/Release, where .exe is)
- debug exe and step through code
- or copy exe and dll to empty dir and run exe dll, watch the magic happen.

First the exe code:

<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
<br />
#include "stdafx.h"<br />
<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
<br />
#ifdef  MYEXE_EXPORTS<br />
#define MYEXE_API __declspec(dllexport)<br />
#else<br />
#define MYEXE_API __declspec(dllimport)<br />
#endif<br />
<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
<br />
// forward declare<br />
class  MyApp;<br />
<br />
// function prototypes for plugin exports<br />
typedef  bool  (*PLUGININIT)  ( MyApp *APP );<br />
typedef  void  (*PLUGINTERM)  ( void );<br />
typedef  bool  (*APPTOPLUGIN) ( long MSGID, char *MSGSTR );<br />
<br />
// function pointers to be used by app<br />
PLUGININIT   PluginInit  = NULL;<br />
PLUGINTERM   PluginTerm  = NULL;<br />
APPTOPLUGIN  AppToPlugin = NULL;<br />
<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
<br />
class  MYEXE_API  MyApp {<br />
public:<br />
	int   Run         ( void );<br />
	bool  PluginToApp ( long MSGID, char *MSGSTR );<br />
};<br />
<br />
//...............................................<br />
<br />
int  MyApp::Run( void )<br />
{<br />
	// simple test, app sends plugin msg, plugin echos back<br />
	AppToPlugin(1, "First  Msg");<br />
	AppToPlugin(2, "Second Msg");<br />
	return(0);<br />
}<br />
<br />
//...............................................<br />
<br />
// plugin calls this to send msg to app<br />
bool  MyApp::PluginToApp( long MSGID, char *MSGSTR )<br />
{<br />
	if( MSGSTR )  fprintf(stdout, "App got from Plugin: %ld %s \n", MSGID, MSGSTR);<br />
	return(true);<br />
}<br />
<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
<br />
int main( int argc, char* argv[] )<br />
{<br />
	MyApp  app;<br />
<br />
	// load the dll - the first arg to the program<br />
	// e.g. run as: > MyExe.exe  MyDll<br />
	HMODULE  lib = ::LoadLibrary(argv[1]);<br />
	if( !lib )  return(-1);<br />
<br />
	// get plugin exported functions<br />
	// note: the ones exported as C++ functions use the mangled names<br />
	PluginInit  = (PLUGININIT)  ::GetProcAddress(lib, "?PluginInit@@YA_NPAVMyApp@@@Z");<br />
	PluginTerm  = (PLUGINTERM)  ::GetProcAddress(lib, "?PluginTerm@@YAXXZ");<br />
	AppToPlugin = (APPTOPLUGIN) ::GetProcAddress(lib, "AppToPlugin");<br />
<br />
	if( !PluginInit )   return(-2);<br />
	if( !PluginTerm )   return(-3);<br />
	if( !AppToPlugin )  return(-4);<br />
<br />
	// tell plugin what app object it should talk to <br />
	if( !PluginInit(&app) )  return(-5);<br />
<br />
	// start app processing<br />
	int  rc = app.Run();<br />
<br />
	// tell plugin we are shutting down<br />
	PluginTerm();<br />
<br />
	::FreeLibrary(lib);<br />
<br />
	return(rc);<br />
}<br />
<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
<br />
<br />
Now the dll code:<br />
<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
<br />
#include "stdafx.h"<br />
#include "MyDll.h"<br />
#include <stdio.h><br />
<br />
// need to link to MyExe.lib to get MyApp methods<br />
#pragma  comment(lib, "MyExe")<br />
<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
<br />
BOOL APIENTRY DllMain( HANDLE MOD, DWORD REASON, LPVOID RES )<br />
{<br />
    switch( REASON ) {<br />
		case DLL_PROCESS_ATTACH :<br />
		case DLL_THREAD_ATTACH  :<br />
		case DLL_THREAD_DETACH  :<br />
		case DLL_PROCESS_DETACH :  break;<br />
    }<br />
    return TRUE;<br />
}<br />
<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
// Header File:<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
<br />
#ifdef  MYDLL_EXPORTS<br />
#define MYDLL_API __declspec(dllexport)<br />
#else<br />
#define MYDLL_API __declspec(dllimport)<br />
#endif<br />
<br />
//===============================================<br />
<br />
// included from app header<br />
class  MyApp {<br />
public:<br />
	MyApp( void );<br />
<br />
	long  MsgId;<br />
	int   Run         ( void );<br />
	bool  PluginToApp ( long MSGID, char *MSGSTR );<br />
};<br />
<br />
//===============================================<br />
<br />
// these we will export as C++ functions<br />
MYDLL_API  bool  PluginInit  ( MyApp *APP );<br />
MYDLL_API  void  PluginTerm  ( void );<br />
<br />
#ifdef __cplusplus<br />
extern "C" {<br />
#endif<br />
<br />
// this will be exported as a C function<br />
MYDLL_API  bool  AppToPlugin ( long MSGID, char *MSGSTR );<br />
<br />
#ifdef __cplusplus<br />
}<br />
#endif<br />
<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
// Source File:<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />
<br />
MyApp  *App = NULL;<br />
<br />
//===============================================<br />
<br />
bool  PluginInit( MyApp *APP )<br />
{<br />
	App = APP;<br />
	return(App?true:false );<br />
}<br />
<br />
//...............................................<br />
<br />
void  PluginTerm( void )<br />
{<br />
	App = NULL;<br />
}<br />
<br />
//...............................................<br />
<br />
#ifdef __cplusplus<br />
extern "C" {<br />
#endif<br />
<br />
bool  AppToPlugin( long MSGID, char *MSGSTR )<br />
{<br />
	if( MSGSTR )  fprintf(stdout, "Plugin got from App: %ld %s \n", MSGID, MSGSTR);<br />
<br />
	// echo back<br />
	if( App )  App->PluginToApp(MSGID, MSGSTR);<br />
<br />
	return(true);<br />
}<br />
<br />
#ifdef __cplusplus<br />
}<br />
#endif<br />
<br />
//////////////////////////////////////////////////////////////////////////<br />
//////////////////////////////////////////////////////////////////////////<br />

...cmk

Save the whales - collect the whole set

Re: Export Member function / class

Steve Messer25-Mar-05 5:25

Steve Messer

25-Mar-05 5:25

cmk,

Thanks alot, your DA MAN.

I will try this out very shortly.

Steve

Re: Export Member function / class

Steve Messer25-Mar-05 9:51

Steve Messer

25-Mar-05 9:51

cmk,

It there any way you can email the files you made. I tried to reconstruct the projects from your code snipits and I am getting linking errors. I am putting something in the wrong place.

thanks,

Steve

smesser at xmission dot com

Re: Export Member function / class

Steve Messer24-Mar-05 19:11

Steve Messer

24-Mar-05 19:11

I tried this method but I am having linking problems

Here is what I have in my exe

#define EXE_API __declspec(dllexport)
EXE_API BOOL Message(CSystem * pSystem, IMessage * pMessage ); // Member function

Here is what I have in my plugin:

// import.h
#pragma comment( lib, "core.lib"  )   // lib of the exe
#define EXE_API __declspec(dllimport)
EXE_API BOOL Message(CSystem * pSystem, IMessage * pMessage );

Here is the function in the plugin trying to return a message back to the .exe

BOOL PluginA::OnMessage( CSystem* pSystem, IMessage* pMessage, BOOL* Result )
{
   CSystem * pSys = NULL;
   IMessage * pMsg = NULL;

   Message( pSys, pMsg ); // back to exe
   return TRUE;
}

Here is the linker error

HTPCPLUGIN error LNK2019: unresolved external symbol 
"int __cdecl Message(class CSystem *,class IMessage *)" 
(?Message@@YAHPAVCSystem@@PAVIMessage@@@Z) referenced 
in function "public: virtual int __thiscall 
PluginA::OnMessage(class CSystem *,class IMessage *,int *)" (?OnMessage@PluginA@@UAEHPAVCSystem@@PAVIMessage@@PAH@Z)

Did I miss something?

Re: Export Member function / class

David Crow24-Mar-05 8:38

David Crow

24-Mar-05 8:38

I am working on a plug-in application similar to this. The actual EXE belongs to IBM and my part is just a DLL. The two communicate via COM interfaces. We add a few entries to the registry so that the EXE knows that our plug-in exists, and when certain events happen our plug-in is "notified" through a few standard interfaces. I know this is unlike what you are doing, but I just wanted to mention that this is at least one other way for "generic" EXEs to communicate with plug-in DLLs.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Export Member function / class

Steve Messer24-Mar-05 13:27

Steve Messer

24-Mar-05 13:27

Thanks for this alternate approach. I was trying to steer clear of COM. My project started out simple and seems to grow exponentially is terms of complexity and technologies used.

Step 1) I just want a simple program that can simulate a HTPC front-end.
Step 2) It would be nice if the interface was XML based.
Step 3) Needs some direct-x cause gdi+ is so slow.
Step 4) I want to add plug-in technology. Max ability Min coupling. ( not asking much Smile | :)

Step 5) My back sure is itchy.... Back scratching functionality

Dundas OXMultiComboBox crashes

Bernhard23-Mar-05 20:01

Bernhard

23-Mar-05 20:01

Hi all,

I am using the Dundas Ultimate Toolbox in one of my MFC Programs (VC6). Sometimes (and this is exactly the problem), the program makes a debug assertation in this function:

COXMultiComboBox::OnMeasureItem

in this line:
ASSERT(AfxIsValidAddress(pRowData, sizeof(COXRowData)));

Any ideas ?

All the label says is that this stuff contains chemicals "... known to the State of California to cause cancer in rats and low-income test subjects."
Roger Wright
http://www.codeproject.com/lounge.asp?select=965687&exp=5&fr=1#xx965687xx

ado can not run when WinXP update to sp2?

Lido Paul23-Mar-05 19:54

Lido Paul

23-Mar-05 19:54

system information:win XP + sp2 + Microsoft Data Access Components 2.8 + VC++6.0 + Access.
application works well before i update pack to sp2, but since then it cannot work.i find the it is crashed when it run sql
"SELECT DISTINCT Info.* FROM Info WHERE Deleted = 0 ORDER BY ID DESC". i run this sql in access and it is well. i think it is winxp sp2's problem. so please give me some suggestion about it. codeguru[^]

Happy Gemini

End of file?

sacoskun23-Mar-05 19:49

sacoskun

23-Mar-05 19:49

Hi, I have a simple code.

#include "stdafx.h"<br />
#include <iostream><br />
using namespace std;<br />
<br />
#include <cstdlib><br />
#include <ctime><br />
typedef int DataType;<br />
<br />
void selectionSort( DataType theArray[], int n );<br />
int indexOfLargest( const DataType theArray[], int size );<br />
void mySwap( DataType& x, DataType& y );<br />
<br />
int _tmain(int argc, _TCHAR* argv[])<br />
{<br />
	return 0;<br />
}<br />
<br />
void selectionSort( DataType theArray[], int n )<br />
{<br />
   for (int last = n-1; last >= 1; --last)<br />
   {  <br />
	  int largest = indexOfLargest(theArray, last+1);<br />
<br />
	  // Descending order.<br />
      mySwap(theArray[largest], theArray[n - last]);<br />
<br />
   }  // end for<br />
}  // end selectionSort<br />
<br />
int indexOfLargest( const DataType theArray[], int size )<br />
{<br />
   int indexSoFar = 0;  // index of largest item <br />
                        // found so far<br />
   for (int currentIndex = 1; currentIndex < size; ++currentIndex)<br />
   {  // Invariant: theArray[indexSoFar] >= <br />
      //            theArray[0..currentIndex-1]<br />
     if (theArray[currentIndex] > theArray[indexSoFar])<br />
         indexSoFar = currentIndex;<br />
   }  // end for<br />
<br />
   return indexSoFar;  // index of largest item<br />
}  // end indexOfLargest<br />
<br />
void mySwap( DataType& x, DataType& y )<br />
{<br />
   DataType temp = x;<br />
   x = y;<br />
   y = temp;<br />
}  // end swap

Compiler gives the error
d:\CD\myProjects\hw2Q4\hw2Q4.cpp(14): fatal error C1075: end of file found before the left brace '{' at 'd:\CD\myProjects\hw2Q4\hw2Q4.cpp(13)' was matched

There is no unmatched curly, any help would be appricated.

Re: End of file?

Steve Mayfield23-Mar-05 20:28

Steve Mayfield

23-Mar-05 20:28

add:
#include <tchar.h>
after
#include "stdafx.h"

Steve

Re: End of file?

sacoskun23-Mar-05 20:38

sacoskun

23-Mar-05 20:38

#include ?

Re: End of file?

toxcct23-Mar-05 22:20

toxcct

23-Mar-05 22:20

yes, read back your post.....

and use the "modify" link to let us see what you really #include (dont type directly < and >, they will be interpreted as HTML tags)...

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: End of file?

eli1502197923-Mar-05 22:33

eli15021979

23-Mar-05 22:33

kromozom wrote:
#include "stdafx.h"
#include
using namespace std;

#include
#include

you've missed the included file names,didn't you? D'Oh! | :doh:

It complies and links but ....

brilliant10123-Mar-05 18:11

brilliant101

23-Mar-05 18:11

It is a code from MSDN.
It complies and links but does not executes giving the following error
File:i386\chkesp.c
line:48
The value of ESP was not properly saved across a fuction call.This is usually a result of calling function decleared with one calling convention with a funciton pointer decleared with a different calling convention.

#include windows.h,Setupapi.h>
#include stdio.h

DWORD Err;

HDEVINFO DoDeviceEnum( GUID InterfaceClassGuid)
/*
Routine Description:
Retrieves the device information set that contains that contains
the devices of the specified class.

the devices of the specified class.

Parameters:
InterfaceClassGuid - The interface class GUID.

Return Value:
If the function succeeds, the return value is a handle to the
device information set.

If the function fails, the return value is zero.
*/
{
HDEVINFO DeviceInfoSet;
HDEVINFO NewDeviceInfoSet;

// Create a device information set that will be the container for
// the device interfaces.

DeviceInfoSet = SetupDiCreateDeviceInfoList(NULL, NULL);

if(DeviceInfoSet == INVALID_HANDLE_VALUE) {
Err = GetLastError();
printf( "SetupDiCreateDeviceInfoList failed: %lx.\n", Err );
return 0;
}

// Retrieve the device information set for the interface class.

NewDeviceInfoSet = SetupDiGetClassDevsEx(

&InterfaceClassGuid, // address of guid required

NULL, // no enumerator

NULL, // no parent window handle (might not be a good idea…)

DIGCF_PRESENT | DIGCF_DEVICEINTERFACE, // flags

//DeviceInfoSet, // do not pass this in, not in function prototype

NULL, // NULL implies local machine

NULL // Reserved’ must be null

);

if(NewDeviceInfoSet == INVALID_HANDLE_VALUE)
{
Err = GetLastError();
printf( "SetupDiGetClassDevsEx failed: %lx.\n", Err );
return 0;
}

return NewDeviceInfoSet;
}

int main(int argc, TCHAR* argv[])
{

GUID var;
DoDeviceEnum(var);

return 0;
}

MFC/GDI Chart

Anonymous23-Mar-05 17:54

Anonymous

23-Mar-05 17:54

Is there anyone out there working on creating a chart program or already created one that uses (8) samples to draw the lines? Program also needs to allow user to select up to 100 samples for line smoothness. I am working on such a program and need some help finishing it. Thanks to all who can help.

Custom DateTimePicker needed

Mr. Malloc23-Mar-05 17:20

Mr. Malloc

23-Mar-05 17:20

I need a DateTimePicker that acts like a CComboBox when the drop down arrow is invoked. More specifically, I need the DateTimePicker so that the user can adjust a date as needed, but when the user selects the drop down arrow, he is able to select from a finite number of strings stored in the CComboBox.

For instance: if the DateTimePicker showed the date (which can easily be adjusted by the user) 1/1/2000, the drop down arrow would display:
5/7/1999
4/12/1998
1/20/1996
3/15/1990

Does anyone know how I can set about creating this hybrid monster?

Reading and Loading files

Notsosuperhero23-Mar-05 15:51

Notsosuperhero

23-Mar-05 15:51

Hi, I have a textbox on the main form and I want to read in some text files to it, I don't want to use MFC.

I have an OPENFILENAME structure and I can read the file, but I can't extract the file's contents into the textbox. For example I have a file called MyFile.txt and I want the text in that file to be loaded into my text box. I hope I explained it well enough.

Thank you in advance for your help.

The only thing you can count on in life is death.

Re: Reading and Loading files

David Crow23-Mar-05 16:43

David Crow

23-Mar-05 16:43

Have you looked into CreateFile(), and ReadFile()?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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