Trying to launch excel2007 using activeX error!!

Question

I am trying to launch excel2007 using activeX and I receive the following error:
Undefined symbol '_Excel_NewApp@20' referenced in "excel.c".
Here is what I did:
 ///excel.c
#include <cvirte.h>  
#include <userint.h>
#include <cviauto.h>
#include <utility.h>
#include <ansi_c.h>
#include "excel.h"
#include "excel2000.h"
static int panelHandle;
static HRESULT status;
static void InitVariables(void);
static int appVisible = 1;
static int excelLaunched = 0;
int PANEL_VISIBILITY;
static ExcelObj_App   ExcelAppHandle = 0;      
int main (int argc, char *argv[])
 if (InitCVIRTE (0, argv, 0) == 0)
  return -1; /* out of memory */
  CA_InitActiveXThreadStyleForCurrentThread (0, COINIT_APARTMENTTHREADED);
 if ((panelHandle = LoadPanel (0, "excel.uir", PANEL)) < 0)
  return -1;
 InitVariables();
 DisplayPanel (panelHandle);
 RunUserInterface ();
 DiscardPanel (panelHandle);
 return 0;
static void InitVariables(void)
    // Demo path and filename
    GetCtrlVal (panelHandle, PANEL_VISIBILITY, &appVisible);
    return;   
int CVICALLBACK runExcel (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
 HRESULT error = 0;
 switch (event)
  case EVENT_COMMIT:
    SetWaitCursor (1);
    error = Excel_NewApp (NULL, 1, LOCALE_NEUTRAL, 0, &ExcelAppHandle);
    SetWaitCursor (0);
    if (error<0)
     MessagePopup ("Error", "An error occurred trying to launch Excel !!!");
    MakeApplicationActive ();
    excelLaunched = 1;   
    printf("ai pornit excel");
   break;
 return 0;
The file excel2000.h is the one from the examples National Instruments\CVI2009\samples\activex\excel and here is defined among others:
HRESULT CVIFUNC Excel_NewApp (const char *server, int supportMultithreading,  LCID locale, int reserved, CAObjHandle *objectHandle);
Please help!

Answer 1

Hello Annees,
Thanks for posting on
National Instruments Forum. 
Try to recompile your
instrument driver you're using to communicate with MS Excel:
Tools>>Create
ActiveX controller then choose Excel Server.
Benjamin R.
R&D Software Development Manager
http://www.fluigent.com/