Hi everyone..
I m trying to control EL-FLOW meter/controller by using CVI LabWindows. I want to use the funtions in the library Flowb32.dll
I can´t use the funtion,
Can someone give me a example, how to call the funtions at the library?
I have done ...
//==============================================================================
//==============================================================================
//==============================================================================
//
// Title: FlowCVI
// Purpose: A short description of the application.
//
// Created on: 16/01/2015 at 11:48:24 by Jose Manuel Caicedo Roque.
// Copyright: ICN. All Rights Reserved.
//
//==============================================================================
//==============================================================================
// Include files
#include <windows.h> //For functions: LoadLibrary, FreeLibrary and GetProcAddress
#include <ansi_c.h>
#include <cvirte.h>
#include <userint.h>
#include "FlowCVI.h"
#include "toolbox.h"
#include <stdio.h> //For printf (print to console)
//==============================================================================
//==============================================================================
//==============================================================================
// Constants
char pszPortName[20];
//==============================================================================
//==============================================================================
//==============================================================================
// Types
/*
Declare a pointer to a function which returns a short and takes a long
as parameter. The name of the type will be _OpenDLL
*/
typedef short (__stdcall * _OpenDLL)(long lHwnd);
//==============================================================================
//==============================================================================
//==============================================================================
// Static global variables
static int panelHandle;
//*Declare a variable to hold the lib-handle*/
HMODULE hLibHandle;
/*Declare a variable to hold the function pointer*/
_OpenDLL OpenDLL;
//==============================================================================
//==============================================================================
//==============================================================================
// Static functions
//==============================================================================
//==============================================================================
//==============================================================================
// Global variables
//==============================================================================
//==============================================================================
//==============================================================================
// Global functions
/// HIFN The main entry-point function.
int main (int argc, char *argv[])
{
int error = 0;
/* initialize and load resources */
nullChk (InitCVIRTE (0, argv, 0));
errChk (panelHandle = LoadPanel (0, "FlowCVI.uir", PANEL));
/*
Load the library into memory. We assume the dll is located in
the windows system (or system32) directory, so we only / have
to supply the filename (instead of the whole path)
*/
hLibHandle = LoadLibrary("Flowb32.dll");
printf ("ID of the hLibHandle = %d\n", hLibHandle);
/*Check if a valid handle has been received*/
if (hLibHandle != 0)
{
// Ok, Valid lib-handle
printf ("Ok, valid Lib-handle \n");
/*
Locate / get the address of the function within the libary.
We have to cast the pointer that was returned to a
function pointer of type _OpenDLL
*/
OpenDLL = (_OpenDLL) GetProcAddress(hLibHandle, "OpenDLL");
printf ("OpenDLL handle = %d\n", OpenDLL);
/*Check if a valid address has been returned*/
if (OpenDLL != 0)
{
/*
Ok, valid address
Now call the function, and print the result to
the terminal
*/
printf("%s %d\n","ID of the application = ",
OpenDLL(0));
/*Library no longer needed, remove it from memory*/
//FreeLibrary(hLibHandle);
}
}
/* display the panel and run the user interface */
errChk (DisplayPanel (panelHandle));
errChk (RunUserInterface ());
Error:
/* clean up */
DiscardPanel (panelHandle);
return 0;
}
//==============================================================================
//==============================================================================
//==============================================================================
// UI callback function prototypes
/// HIFN Exit when the user dismisses the panel.
int CVICALLBACK panelCB (int panel, int event, void *callbackData,
int eventData1, int eventData2)
{
if (event == EVENT_CLOSE)
QuitUserInterface (0);
return 0;
}
//==============================================================================
//================================
