Could AS3 call C++ functions in .dll?

Hi there,
Could I do:
write some C++ functions and compile them into a .dll file;
then call these functions from Actionscript3.0??
If yes, how can I do that?
Thanks a lot.

I guess, you are better off to ask this question in a C forum. This is a Java forum, you know.

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How to call a function in DLL file, while writing test scripts in ATML standards

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With Regards,
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Hi srivinayaka,
I am attaching the XML file i have written in ATML standards and the Labwindows/CVI code that was generated when the XML file is opened in TESTSAND. actually the defenition of the function "IALdcpwr_reset()" is in IALdcpwr.lib and IALdcpwr.h files.
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Attachments:
XMLfile.doc ‏135 KB
XMLfile.doc ‏135 KB

How to access Call Back Functions using *.dll in the Labview?

Hai,
I am Pavan Ram Kumar Somu.
I am new to Labview, currently I am working on MVB Interface.
I need to access the API functions from *.dll file in Labview, as of now , I am doing this with Call function Library node in Labview but it does not support the following data types like
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    2. function pointers Arguments
    3 .pointers in structures and pointer structures in structures and many other data types.
Please Answer the below queries also:
1. How to pass pointer arguments to API functions in DLL and how to collect pointer
    return types from API functions in DLL
2. How to pass structure arguments to API functions in DLL and how to collect structure
    return types from API functions in DLL
3. How to use callback functions(nothing but function pointers) in Labview and how to
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I need your help while passing these datatypes to API functions in DLL from labview.
Suggest me if there is any other alternative for implementing this task.
I am referencing some examples here:
Examples:
I)
Unsigned short int gf_open_device(void *p_device_config, unsigned long int client_life_sign_timeout, unsigned short int *device_error)
void *p_device_config: How to access/pass these arguments in LabView and to which memory location it points in LabView.
II) #include <windows.h>
     #include <process.h>
     HANDLE rcvEvent0, rcvEvent1;
/* Function call*/
CanGetReceiveEvent(handle[0], &rcvEvent0);
Above is a piece of C code, Now I want to use HANDLE datatype which is windows based, how to use these type in the LABVIEW.
With regards
Pavan Ramu Samu

"Somu" <[email protected]> wrote in message news:[email protected]...
Hai,
I am Pavan Ram Kumar Somu.
 
I am new to Labview, currently I am working on MVB Interface.
 
I need to access the API functions from *.dll file in Labview, as of now , I am doing this with Call function Library node in Labview but it does not support the following data types like
    1. Pointer Arguments(To which memory it points in Labview)
    2. function pointers Arguments
    3 .pointers in structures and pointer structures in structures and many other data types.
 
Please Answer the below queries also:
 
1. How to pass pointer arguments to API functions in DLL and how to collect pointer  
    return types from API functions in DLL
 
2. How to pass structure arguments to API functions in DLL and how to collect structure
    return types from API functions in DLL
 
3. How to use callback functions(nothing but function pointers) in Labview and how to
    collect callback fuctions return types from API functions in DLL
 
I need your help while passing these datatypes to API functions in DLL from labview.
 
Suggest me if there is any other alternative for implementing this task.
 
 
I am referencing some examples here:
Examples:
I)
Unsigned short int gf_open_device(void *p_device_config, unsigned long int client_life_sign_timeout, unsigned short int *device_error)
 
void *p_device_config: How to access/pass these arguments in LabView and to which memory location it points in LabView.
 
II) #include <windows.h>
     #include <process.h>
   
     HANDLE rcvEvent0, rcvEvent1;
 
/* Function call*/
CanGetReceiveEvent(handle[0], &rcvEvent0);
 
Above is a piece of C code, Now I want to use HANDLE datatype which is windows based, how to use these type in the LABVIEW.
 
With regardsPavan Ramu Samu
Search the forum (forums.ni.com) for callback, pointer or handle, and you'll find that it is all possible, but not very easy.
e.g.: http://forums.ni.com/ni/board/message?board.id=170&message.id=88974&requireLogin=False
Regards,
Wiebe.

As3 call a function inside swf

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CALL Library Function Nodeで呼び出したDLLの解放

CALL Library　Ｆunction NodeでDLLを叩いた後、
LabVIEWを終了するまで呼び出したDLLが解放されません。
解放する方法は有りますでしょうか？
OS：Windows XP
LV：プロフェッショナル開発システム　8.5.1
行いたい事
ある特定のパスにあるDLLを叩いて計測器を制御しており、
同じルーチンで類似型を制御したいのですが、
・どちらも同じパスの同名DLLでなければならない
・同名DLLは中身が違う
となっております。
つまり
1.計測器Aを制御する為にC:￥TEMP￥A.DLLを叩く
2.計測器Bを制御する為にC:￥TEMPをC:￥_TEMP等にリネームし、
　 B.DLLが入ったフォルダをC:￥TEMPとしたいが、A.DLLがLVで
　ロックされていて出来ない
といった状態です。
どなたかご享受頂けないでしょうか。

MEPHISTO 様
平素より弊社ディスカッションフォーラムをご利用頂きまして誠に有難うございます。
日本ナショナルインスツルメンツ技術部黒須と申します。
LabVIEW 8.2以降のバージョンよりDLLを動的に呼び出すことが可能です。
[LabVIEWでDLLを動的にロード・アンロード]　大変申し訳ございませんが英語での文献となっております。
http://digital.ni.com/public.nsf/allkb/77594203D78D12278625729100758BE5?OpenDocument
こちらの設定はライブラリ関数呼び出しノードの構成画面でダイアグラムでパスを指定という項目にチェックを入れていただくことで、
DLLのファイルパスを指定してあげることができます。
DLLをアンロードする際には空のファイルパスもしくは無効パス指定関数を配線することでDLLを開放することができます。
記事にございます例では選択関数を用いてロード・アンロードを使い分けております。
ライブラリ関数呼び出しノードのヘルプ≫ライブラリ関数呼び出しをクリックしていただきますと、ライブラリ関数呼び出しダイアログボックスの説明がありまして、
そこでライブラリ名またはパスという項目でこちらに関しての説明もございますので併せてご確認ください。
よろしくお願いいたします。
技術部　黒須

Calling functions in dll

Dear all,
I'm facing an issue when a java program (ProgA) calls some functions in a dll, it works fine. But when I use another java program (ProgB) to call the method in ProgA that is calling the functions in dll, it prompts errors (please find the error message at the bottom of this mail). The following scripts are my programs. Please advise.
Can anyone experience the same situation? Please advise how to cope with external library? Should I miss any configuration?
Thanks in advance.
Clive
(ProgA)
package abc.web;
public class Sec_2 {
     // static constructor
     static {
          System.loadLibrary("des");
     public static native int DES_a(String lpszKey, int nMode);
     private static native int DES_b(String s1, String s2, int nAction, int lpnReturnSize);
     private static native void DES_c();
     public int enc2 (String lpszKey, int nMode,String encrypted_msg, int nAction, int lpnReturnSize) {
          int rtn_code = 0;
          rtn_code = DES_a(lpszKey, nMode);
          rtn_code = DES_b(e_msg, OutputMessage, nAction, lpnReturnSize);
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          DES_c();
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     private static String OutputMessage;
     public void setOutputMessage(String s) {
          OutputMessage = s;
     public static String getOutputMessage() {
          return OutputMessage;
     public static void main(String [] argv) {
          int return_code = 0;
          int crypt_return_size = 0;
          enc2(s1, i1, s2, i2, i3);
(ProgB)
package xyz.pen;
import abc.web.Sec_2;
public class LoginOn extends JDialog{
     public CreateLoginDialog() {
          Sec_2 ddd = new Sec_2();
          Sec_2.enc2(a, b, c, d, e);
          System.out.println("Message "+ Sec_2.getOutputMessage());
library des.dll contains function DES_1, DES_2, and DES_3 with following definitions.
JNIEXPORT jint JNICALL Java_abc_web_Sec2_DES_1a(JNIEnv *, jclass, jstring, jint);
JNIEXPORT jint JNICALL Java_abc_web_Sec2_DES_1b(JNIEnv *, jclass, jstring, jstring, jint, jint);
JNIEXPORT void JNICALL Java_abc_web_Sec2_DES_1c(JNIEnv *, jclass);
If Sec_2.class is run solely, the program shows the result normally.
However, if we run LoginOn.class, the following error messages display.
ERROR MESSAGE
E:\>java xyz/pen/LoginOn
Exception in thread "main" java.lang.UnsatisfiedLinkError: DES_a
at xyz.pen.LoginOn.DES_a(Native Method)
at xyz.pen.LoginOn.<init>(LoginOn.java:247)

Hi
Make sure that the dll is visible to LoginOn
You can do so by adding the DLL directory to the Java runtime library path, i.e. pass -Djava.library.path=<dll dir>(alternatively, copy the DLL to Java program's working directory). If the Java code can't find the library, you will get a java.lang.UnsatisfiedLinkError
Hope this helps.

Use call library function node

I try to use call library function node to call a function in DLL and retrieve info stored in the C structure data type, can I do it? If yes, how ? Thanks.

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Could i call airprint from Javascript

How can i call the AirPrint function from my code? Could i call this function from my JavaScritp code?
Message was edited by: JoshuaZheng

What code are you talking about? If it's an app you are developing, you should try asking in Apple's Developer Connection.

How to call external functions without a .DLL (just using a .H and .LIB file)?

Hello everyone,
actually I'm facing little difficulties on how to get an external function getting called from within CVI (Version 2009).
I was supplied with a .H file and a .LIB file to call an external function from within my CVI project. The .H file looks like this:
void exportedFunction(double *parameter);
As far as I know, the external function was written with MS Visual C++ 6.
So I tried to statically link to the extern al function like this:
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- do the external function call
When building I get an unresolved external function call error from CVI so this seems not to be working.
I made some searches around and got up with two possible issues. Maybe one of you can help me get a bit further and get things working.
1) The "real" function code is located in the DLL file which was not delivered to me. Or is there a way to get things done (call external functions) just with a .H and a .LIB file (without any .DLL file included)?
2) The external function does not export according to "C-Style" rules. The function signature in the .H file shows no things like
extern "C" __declspec(dllexport) void __stdcall ...
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I guess I could get around the wrong export style of the function when I manage to write a wrapper around the original function that actually uses C-Style exporting. But I guess I need the .DLL file for this try as well.
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Solved!
Go to Solution.

There is no need for the dllexport stuff. There is also the option for a static library without any DLL. But the 'extern "C"' is essential, because it forces the C++ compiler, which was probably used to compile the library , to use C calling convention.
If you can't ask the provider of the library to provide a version which was compiled using C calling convention the way to go is to write a wrapper with VC++6 around that library which reexports the functions using C calling convertion. Something like
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With java how to call a function offered by user32.dll?

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can you please offer me a piece of code like it. but
the dll should be available with the OS,such as
user32.dll,kernal32.dll ...ect, not the one using jni
to generate.You cannot directly call C functions in this way. You have to use JNI. Have your native method written to normal JNI standards call the functions in the OS. Your native method will also have to take care of creating the data structures needed to make the OS call and also creating the Java data structure you want to return.

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Is it possible to call external functions in a DLL written in C
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Have anyone used Labview to call MSP430_Memory function in the MSP430.dll?

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Good Afternoon,
I just have a couple of quick questions for you:
How are you going about calling the dll in LabVIEW?
Are you using the call library function node?
Could you post your code so we can take a look at it and get a better idea how you are going about it?
I hope you have a great rest of the day!
-Cody C

Help to make opencv's dll and LabVIEW's Call Library function node understanding each others

Hi, i have a little problem trying to use a C++ opencv's dll in labview. I wrote a really simple and stupid dll just to try to understand how it works the call library function node. Here the header code:
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#else
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#include <opencv2/highgui/highgui.hpp>
#include <iostream>
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#include <opencv/highgui.h>
// Questa classe è esportata da Generic DLL.dll
class GENERICDLL_API CGenericDLL {
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#include "Generic DLL.h"
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// Funzioni esportate.
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GENERICDLL_API int opencv(int a)
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Thank you for yours time,
Francesco.

Hello Francesco,
I'm having exactly the same problem as you. I created a DLL that I can easily access from LabView. If I add one line and include "imgproc.hpp" (the only one I need), then LV gives me the same error you had. I read the thread Loura linked to, but I don't see how people actually take care of the dependecies (Klemen's examples did not work for me for the same reason, even though I recompiled the .cpp). Could you explain in detail what you did to make it work?
Thanks

When I use Call Library Function Node in real time, is the DLL loaded once for all or load every time it is called?

When I use Call Library Function Node in real time, is the DLL loaded once for all or load every time when it is called?
I have a time critical real time application, in which I use a piece of DLL function developed by C++. It is OK? Could any senior developer assure me?
Thank you in advance.
Solved!
Go to Solution.

qing_shan61 wrote:
When I use Call Library Function Node in real time, is the DLL loaded once for all or load every time when it is called?
Once
qing_shan61 wrote:
I have a time critical real time application, in which I use a piece of DLL function developed by C++. It is OK?
OK
Be sure that all DLL calls are thread safe (do not perform calls in UI thread).
Also for real-time application you need real-time OS.
Andrey.

Could AS3 call C++ functions in .dll?

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