How to use dll in Labview ?

I compile this code to dll file with VC++2010 filename is test_dll.dll .
#include "stdafx.h"
#include <iostream>
#include <Windows.h>
using namespace std;
int main(int a){
    cout << "Test dll...............\n";
    return a;
After that, I put Call Library Function node in editor and double click Call Library Function node. I browse test_dll.dll into Library name or path and set function prototype to int32_t main(int32_t a); but it show error Call Library Function Node 'test_dll.dll:main':function not found in libraly. How to use dll in Labview ?  And I have more question is what is differrent from Tools -> Import -> Shared Library(.dll) and use Call Library Function node.
Solved!
Go to Solution.

The issue you are having is that LabVIEW is not capable of using C++ DLLs directly. It only handles C DLLs. This does not mean that if you you cannot use the DLL if it's compiled with the C++ compiler as opposed to the C compiler. Rather, it means that you must take extra steps in order to use it from LabVIEW. The primary issue is that of name mangling or adornment. This is discussed here: http://zone.ni.com/devzone/cda/tut/p/id/4877. Basically you need to prepend extern "C" in front of your prototypes in your header files. I would also suggest reviewing this article: https://decibel.ni.com/content/docs/DOC-14564.

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              >>---------------------------------------------------------
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              >>}
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              >>JNIEXPORT jboolean JNICALL
              >> Java_Infolenz_Authentication_SimpleNTAuthentication_authenticateNTUser
              >> (JNIEnv *env,
              >> jclass javaClass,
              >> jstring jDomainName,
              >> jstring jUserId,
              >> jstring jPassword )
              >>{
              >> jboolean authenticated;
              >> HANDLE hToken;
              >>
              >>
              >> // get the provided domain name, user id and password
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              >> const char *cUserId = env->GetStringUTFChars(jUserId, 0);
              >> const char *cPassword = env->GetStringUTFChars(jPassword, 0);
              >>
              >>
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              >> // const nature of the jstring char array.
              >> // Inappropriate access to this data can crash the VM!
              >> char *domainName = new char[env->GetStringUTFLength(jDomainName)
              >+
              >>1];
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              >> char *password = new char[env->GetStringUTFLength(jPassword) + 1];
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              >> strcpy(domainName, cDomainName);
              >> strcpy(userId, cUserId);
              >> strcpy(password, cPassword);
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              >> env->ReleaseStringUTFChars(jDomainName, cDomainName);
              >> env->ReleaseStringUTFChars(jUserId, cUserId);
              >> env->ReleaseStringUTFChars(jPassword, cPassword);
              >>
              >> // try to authenticate
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              >> password,
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              >> LOGON32_PROVIDER_DEFAULT,
              >> &hToken))
              >>
              >> authenticated = JNI_TRUE;
              >> else
              >> authenticated = JNI_FALSE;
              >>
              >> // delete the memory that was allocated
              >> delete domainName;
              >> delete userId;
              >> delete password;
              >>
              >> // close the handle created by LogonUser
              >> CloseHandle(hToken);
              >>
              >> return authenticated;
              >>}
              >>
              >>-------------------------------------------------------------
              >>
              >>Ann Cao <[email protected]> wrote:
              >>>Are you using JNI? There are two problems that could cause Unsatisfied
              >>>link errors. One is the DLL not found, and the other is that the DLL
              >>>is
              >>>found but is unreadable or the specific function cannot be found in
              >>it.
              >>>Since you have set your path correctly, I guess the reason you got
              >the
              >>>error is the second cause.
              >>>
              >>>Sylvie wrote:
              >>>
              >>>> I wrote a test java program to call the authenticate function.
              >>>> but get a Unsatisfied Link Error. It seems that my program
              >>>> has problem to load the DLL. But I have set the path to include
              >>>> the directory containing the DLL. Dose somebody know what is going
              >>>on?
              >>>>
              >>>> Thanks,
              >>>> Sylvie
              >>>>
              >>>> "Sylvie" <[email protected]> wrote:
              >>>> >
              >>>> >Hello, all,
              >>>> >
              >>>> >I wrote a program to check the user authentication by call Windows's
              >>>> >cryptography
              >>>> >functions. I have generated a DLL file,
              >>>> >and have put it in the C:\bea\jdk131_03\jre\bin. But my jsp
              >>>> >page seems ignoring the java code to call the function in the
              >>>> >DLL. I am not sure what should be imported at the head of the
              >>>> >jsp file. Would somebody kindly help me out? Thanks a lot!!!
              >>>> >My jsp code is here:
              >>>> >
              >>>> ><%@ page import="java.sql.Connection"%>
              >>>> >
              >>>> ><html>
              >>>> ><head>
              >>>> ><title>
              >>>> >Jsp1
              >>>> ></title>
              >>>> ></head>
              >>>> >
              >>>> ><body>
              >>>> ><h1>
              >>>> >JBuilder Generated JSP
              >>>> ></h1>
              >>>> ><%
              >>>> > try{
              >>>> > if(Ntauth.authenticate("gecorg", "almond", "1025"))
              >>>> > out.println("Valid user credenticals");
              >>>> > else
              >>>> > out.println("Invalid user credenticals");
              >>>> > }catch(Exception e)
              >>>> > {
              >>>> > out.println(e);
              >>>> > }
              >>>> > %>
              >>>> >
              >>>> >
              >>>> ></body>
              >>>> ></html>
              >>>> >
              >>>
              >>>--
              >>>Regards,
              >>>Ann
              >>>Developer Relations Engineer
              >>>BEA Support
              >>>
              >>>
              >>
              >
              

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