Fall into a trouble when calling a dll from java in linux

Hi, experts:
I encountered a big trouble when using JNI to call a C++-compiled DLL from java in Linux: The DLL function didn't execute immediately after the invocation, and was deferred till the end of the Java execution. But all worked well after migrating to windows. This problem made me nearly crazy. Can somebody help me? Thanks in advance.
Linux: fedora core 8, jdk1.6.0_10,
compile options: g++ -fPIC -Wall -c
g++ -shared

It looks like the OP compiled the C source file and linked it into a Windows .dll, which would explain why it worked flawlessly in Windows. (Though I must say the usage of GCC would make someone think it was compiled in Linux for Linux, GCC also exists for Windows, so I'm not sure it's a Windows .dll either...)
@OP: Hello and welcome to the Sun Java forums! This situation requires you to make both a .dll and a .so, for Windows and Linux. You can then refer to the correct library for the operating system using System.loadLibrary("myLibrary"); without any extension.
s
Edited by: Looce on Nov 21, 2008 11:33 AM

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Problem when calling a report from java

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Calling multiple DLL from Java and calling same native method

i have two dll files named DLL_1.dll and DLL_2.dll .
Both of them contain a native method which has a signature
JNIEXPORT void JNICALL Java_Database_Notify
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This method is common to both the DLL
Now i load both of the DLL's using,
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System.loadLibrary("DLL_2");
Both of the DLL are loaded form same Java Application
But the problem is that , whenever i try to call the Notify Method , it calls the Notify method of DLL_1 only.
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i have two dll files named DLL_1.dll and DLL_2.dll .
Both of them contain a native method which has a
signature
JNIEXPORT void JNICALL Java_Database_Notify
(JNIEnv *, jclass);
This method is common to both the DLL
Now i load both of the DLL's using,
System.loadLibrary("DLL_1");
System.loadLibrary("DLL_2");
Both of the DLL are loaded form same Java
Application
But the problem is that , whenever i try to call the
Notify Method , it calls the Notify method of DLL_1
only.
How do i call the Notify Methos of second DLL(i.e
DLL_2).
Is there any reference that i can get to all the DLL
files when i load then , so that i can use that
reference to invoke the Notify method of that
particular DLL.You need to explain exactly what you are trying to achieve.
As per the description above it is impossible in java.
And I didn't say JNI, I said java.
Your above statement suggests that you think that you can have exactly the same java signature do two different things.
Note again that I said java not JNI.
A JNI method is just a tag that represents a java signature. Your description suggests that you are attempting to do it twice.
There are three possibilities.
1. Your explanation is incomplete.
2. You are trying to do something that is impossible in java.
3. You are trying to solve a problem and your description of your solution is not sufficient to determine what that is (and of course the solution is wrong.)

Array limitation when calling VB Dll?

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Hi sthu,
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VI Memory Usage
Managing Large Data Sets in LabVIEW
Donovan

How to call labview DLL from C#, passing char, char[], float[], long, short

Hi,
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void __stdcall Optical_Center(char FileDirectory[], long ImagePtr,
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I was just about to post the header file of the DLL, when
I noticed that there's a function called LVDLLStatus.
This little thingie turned out to be a rather handy tool.
With that function I found that in the DLL I had a problem
with another function that prevented the DLL to be correctly
loaded.
This other function in the DLL is for generating digital output
and it worked as it should, when tested from LV.
Anyway if someone is interested, I got it working by using
the LoadLibrary and GetProcAddress function, as in the
source code thatI posted earlier.
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Calling back c++ method in an exe (not a dll) from java?

Hi all,
I have to make an hybrid C++/java from an existing C++
application that compiled is a big single exe not a dll.
I'm running under win32.
The application consists of several windows. The hybrid
will have widows in C++ and some in java. They have the
same menu and tool bar. In the C++, there are some
callbacks called when a button is pressed. How to call
these callback from java given the fact that the JVM and
the java classes are launched by the exe file.
I know how, from C++, start JVM and call my java window.
I also know how to call a C++ method that is in a dll from
java. It's from the tutorial
http://java.sun.com/docs/books/tutorial/native1.1/index.html
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Thanks,
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Thanks this helped.
For those who want a complete example, here it is:
Tested on XP, java 1.4.2, VC++ 6.0.
************ File invoke.cpp *****************************
#include <stdlib.h>
#include <jni.h>
#ifdef _WIN32
#define PATH_SEPARATOR ';'
#else /* UNIX */
#define PATH_SEPARATOR ':'
#endif
#define USER_CLASSPATH "." /* where Prog.class is */
void JNICALL displayHelloWorld(JNIEnv *env, jobject obj)
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void main() {
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    JavaVM *jvm;
    JavaVMInitArgs vm_args;
    jint res;
    jclass cls;
    jmethodID mid;
    jstring jstr;
    jobjectArray args;
    char classpath[1024];
     int result;
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     JavaVMOption options[3];
     options[0].optionString = "-verbose:gc";
     sprintf (classpath, "-Djava.class.path=%s", USER_CLASSPATH);
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     options[2].optionString = "-Djava.compiler=NONE";
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}********************* File ./mypackage/Prog.java **************************
package mypackage;
public class Prog {
       public native void displayHelloWorld();
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        System.out.println(" -2 From C++ call java method using argument from C++");
        System.out.println(" -3 From java, that was launched by the exe, call to");
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        System.out.println("You got a bidirectional example with as starting point");
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}******************* Command line for all ****************************************
javac mypackage/Prog
cl -I"D:\Program Files\j2sdk1.4.2_03\include" -I"D:\Program Files\j2sdk1.4.2_03\include\win32" -MT
invoke.cpp -link D:\PROGRA~1\j2sdk1.4.2_03\lib\jvm.lib
(Remark, the last path is using the short name for "Program Files" because with the blank
even adding double quotes result into an error)
You must have jvm.dll in your path for me it's Path=D:\Program Files\j2sdk1.4.2_03\jre\bin\client;
Then simply call invoke and see the result. :-)

Calling external dll from oracle 8i pl/sql

Hi
I am facing in calling extrenal dll from pl/sql.
Steps followed by me are
1.
create library crc_lib as
'D:\ORACLE\ORA81\RDBMS\EXTPROC\EXTPROC\my.DLL';
2.
CREATE OR REPLACE FUNCTION check_file_crc (f1 char)
RETURN BOOLEAN AS
EXTERNAL LIBRARY CRC_LIB
NAME "Check_File_CRC"
LANGUAGE C;
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BEGIN
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EXCEPTION
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ORA-28576: lost RPC connection to external procedure agent
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(CONNECT_DATA =
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(PRESENTATION = RO)
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SID_LIST_LISTENER =
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Edited by: prashant13 on Jul 23, 2009 11:27 AM

See if MOS note      468404.1 proves helpful here (though not meant for your version of Oracle).

Calling LV DLL from VB

I have a vi that initializes, measures, and releases
an OSA instrument. I want to call this routine from VB.
I used Standard calling convention when making DLL from LV.
Here is my VB declaration:
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(ByVal GPIB As Long, _
ByVal Serial_Number As String, _
ByVal FileName As String, _
ByVal File_Path As String, _
ByVal Start_Wavelength_nm As Double, _
ByVal Stop_Wavelength_nm As Double, _
ByVal Level_Scale_dB As Double, _
ByVal Res_nm As Double, _
ByVal Peak_Wavelength As Double, _
ByVal Peak_Level As Double, _
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ByVal FWHM As Double, _
ByVal Mode_Offset As Double, _
ByRef Level_Array() As Double, _
ByRef Wa
velength_Array() As Double, _
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Attachments:
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Basically what i want to do is to call the microchip's dll called "mpusbapi.dll" from VB6. This dll is written in C++. This dll has some basic functions of usb like MPUSBRead() , MPUSBWrite , MPUSBOpen() etc.
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How to call LabVIEW dll from ATL COM dll

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Error 2 error C2733: second C linkage of overloaded function 'StrCpyW' not allowed d:\program files\national instruments\labview 8.6\cintools\extcode.h 464
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these many errors.
Will some one explain me how to call LabVIEW dll from ATL COM dll.
Thanks & Regards,
Jay

I also had this problem. My application is unicode-aware, but I was attempting to link it to a library with primitive C-string arguments. You could dynamically load the DLL as suggested (more work), modify the header files (really not recommended), or if you are feeling lucky you could try fooling the compiler, as I was successfully able to do in Visual Studio 2010, by steering the preprocessor around those functions (assuming you're not using them, of course -- otherwise this probably wouldn't work):
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Is it possible to call VB dll in Java

Is it possible to call VB dll in Java?
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@EJB
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"This works great from client"
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I have two questions
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Revision: 13201
Revision: 13201
Author:   [email protected]
Date:     2009-12-23 12:16:41 -0800 (Wed, 23 Dec 2009)
Log Message:
Fix RTE when calling PopUpManager.createPopUp() from a module or sub-application.
This fix adds a moduleFactory parameter to PopUpManager.createPopUp() to allow a module or sub-application to specify the style manager to be used. Modules and sub-applications should always pass a moduleFactory to PopUpManager.createPopUp() or PopUpManager.addPopUp() to ensure the correct style manager is used when looking up styles. Otherwise the parent of the pop up is used to determine the style manager.
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Doc notes: None.
Bugs: SDK-24835.
Reviewer: Alex
Tests run: checkintests, Managers/PopUpManager
Is noteworthy for integration: no
Ticket Links:
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Modified Paths:
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I have a new MacBook Pro Mid 2012 and it goes into deep sleep when I disconnect if from AC power.

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https://discussions.apple.com/thread/4512384
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Video only enabled when call is initiated from one direction across SIP Trunk

wonder If anyone can shed some light on this.
I have an issue between two cucm clusters, tied together with a SIP trunk.
If we dial from Australia to the US there is two way video and audio. If the US calls Australia, there is only audio. I have run a test call from the US through VLT and have found the following SDP's (see below). When The US make a video enabled call to australia the message "Video is not available, Remote party has video off" on the US phone screen.
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what other settings can I check to get video to work when calls get initiated from either direction,...................
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=======this is from the phone in Australia to the CUCM in australia phone IP 10.61.4.112======================================
45870304.002 |09:02:07.941 |AppInfo |SIPTcp - wait_SdlReadRsp: Incoming SIP TCP message from 10.61.4.112 on port 34271 index 53563 with 2089 bytes:
[344530309,NET]
SIP/2.0 200 OK
Via: SIP/2.0/TCP 10.61.2.82:5060;branch=z9hG4bKe0103892bbb75
From: "Anonymous" <sip:[email protected]>;tag=109791678~1b5af941-cea2-4a00-a0bd-15a532224d7d-59374526
To: <sip:[email protected]>;tag=5057a887bfdd550c0d321a20-7f843426
Call-ID: [email protected]
Date: Wed, 29 Apr 2015 23:02:07 GMT
CSeq: 101 INVITE
Server: Cisco-CP8941/9.4.2
Contact: <sip:[email protected]:34271;transport=tcp>;video
Allow: ACK,BYE,CANCEL,INVITE,NOTIFY,OPTIONS,REFER,REGISTER,UPDATE,SUBSCRIBE,INFO
Remote-Party-ID: "Dennis Mink - 33935" <sip:[email protected]>;party=called;id-type=subscriber;privacy=off;screen=yes
Supported: replaces,join,sdp-anat,norefersub,resource-priority,extended-refer,X-cisco-callinfo,X-cisco-serviceuri,X-cisco-escapecodes,X-cisco-service-control,X-cisco-srtp-fallback,X-cisco-monrec,X-cisco-config,X-cisco-sis-7.0.0,X-cisco-xsi-8.5.1
Allow-Events: kpml,dialog
Recv-Info: conference
Recv-Info: x-cisco-conference
Content-Length: 966
Content-Type: application/sdp
Content-Disposition: session;handling=optional
v=0
o=Cisco-SIPUA 28123 0 IN IP4 10.61.4.112
s=SIP Call
t=0 0
m=audio 16736 RTP/AVP 0 8 18 102 9 116 101
c=IN IP4 10.61.4.112
a=trafficclass:conversational.audio.avconf.aq:admitted
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:102 L16/16000
a=rtpmap:9 G722/8000
a=rtpmap:116 iLBC/8000
a=fmtp:116 mode=20
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
m=video 16738 RTP/AVP 126 97
c=IN IP4 10.61.4.112
b=TIAS:2000000
a=trafficclass:conversational.video.avconf.aq:admitted <----this is missing from US SDP
a=rtpmap:126 H264/90000
a=fmtp:126 profile-level-id=428014;packetization-mode=1;level-asymmetry-allowed=1;max-mbps=36000;max-fs=1200;max-rcmd-nalu-size=1300
a=imageattr:126 send * recv [x=640,y=480]
a=rtpmap:97 H264/90000
a=fmtp:97 profile-level-id=428014;packetization-mode=0;level-asymmetry-allowed=1;max-mbps=36000;max-fs=1200
a=imageattr:97 send * recv [x=640,y=480]
a=rtcp-fb:* ccm tmmbr
a=sendrecv
============below is coming from the US (phone IP is 10.1.109.81)================
04/30/2015 09:02:08.169 Send 10.61.4.112 SIP ACK bfa99a00-541162ed-71da57-52023d0a NotAvail
SIPTcp - wait_SdlSPISignal: Outgoing SIP TCP message to 10.61.4.112 on port 34271 index 53563
[344530326,NET]
ACK sip:[email protected]:34271;transport=tcp SIP/2.0
Via: SIP/2.0/TCP 10.61.2.82:5060;branch=z9hG4bKe010481f320b08
From: "Anonymous" <sip:[email protected]>;tag=109791678~1b5af941-cea2-4a00-a0bd-15a532224d7d-59374526
To: <sip:[email protected]>;tag=5057a887bfdd550c0d321a20-7f843426
Date: Wed, 29 Apr 2015 23:02:05 GMT
Call-ID: [email protected]
User-Agent: Cisco-CUCM10.0
Max-Forwards: 70
CSeq: 101 ACK
Allow-Events: presence
Content-Type: application/sdp
Content-Length: 456
SDP Message
====================================================
v=0
o=CiscoSystemsCCM-SIP 109791678 1 IN IP4 10.61.2.82
s=SIP Call
c=IN IP4 10.1.109.81
b=TIAS:8000
b=AS:8
t=0 0
m=audio 16412 RTP/AVP 18 101
a=rtpmap:18 G729/8000
a=fmtp:18 annexb=no
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=trafficclass:conversational.audio.aq:admitted <---what does this do here, and how?
m=video 0 RTP/SAVP 31 34 96 97 <-----------port 0. why?
a=rtpmap:31 H261/90000
a=rtpmap:34 H263/90000
a=rtpmap:96 H263-1998/90000
a=rtpmap:97 H264/90000
a=content:main
a=inactive

Hi Dennis,
On US phone SDP media attribute is inactive.
a=rtpmap:97 H264/90000
a=content:main
a=inactive
Are you sure that audio works ? Can you please share all the SIP messages of both the scenarios.
Thanks
Manish

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