Using AFX_MANAGE_STATE(AfxGetStaticModuleState()) in JNI..

Hi All,
I have a question.
This is the clearest explanation of using
AFX_MANAGE_STATE(AfxGetStaticModuleState())
that I've seen:
"By default, MFC uses the resource handle of the main application to load the resource template. If you have an exported function in a DLL, such as one that launches a dialog box in the DLL, this template is actually stored in the DLL module. You need to switch the module state for the correct handle to be used. You can do this by adding the following code to the beginning of the function:"
In my JNI code I don't knowingly use any MFC DLLs
and I don't use JNI to put up any Dialogs, just straight
ADSI and WMI code, so my question is, should I use
AFX_MANAGE_STATE(AfxGetStaticModuleState())
in my JNI code? My JNI DLLs are an important part
of my Servlets. Is it something like:
"It wouldn't hurt.."? :-)
Thanks,
Joe Siebenmann

Hi Maxim,
of course you can. There exists a mechanism called JNI (Java Native Invocation) as you already mentioned.
I guess using JNI is the easiest way to achieve what you want.
I don't have any knowledge in detail what causes your "java.lang.UnsatisfiedLinkError" - Error but it looks to me like the JVM isn't able to find your DLL which contains the native C/C++ - Code.
To help the JVM find the DLL or SO you have either to copy your DLL/SO in a globally known LIB-Directory or, which is better in my opinion, adjust der global libary path so it also points to YOUR DLL/SO by doing the following under
Unix or Linux:
LD_LIBRARY_PATH=`pwd`
export LD_LIBRARY_PATH
OR
Windows NT/2000/95:
set PATH=%path%;.
I would also recommend to check out the following link:
http://java.sun.com/developer/onlineTraining/Programming/JDCBook/jni.html
I hope this helps !!!
Best Regards,
Frank

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public HelloWorld() {
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static {
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#include "JNITest2.h"
#include <stdio.h>
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The .h file:/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class HelloWorld */
#ifndef IncludedHelloWorld
#define IncludedHelloWorld
#ifdef __cplusplus
extern "C" {
#endif
* Class: HelloWorld
* Method: displayHelloWorld
* Signature: ()V
JNIEXPORT void JNICALL Java_HelloWorld_displayHelloWorld
(JNIEnv *, jobject);
#ifdef __cplusplus
#endif
#endif
The Error I Get:
[2943UK@hercules classes]# cc -g -I/usr/local/jdk1.3/include -I/usr/local/jdk1.3/include/linux HelloWorldImp.c -o libhello.so
/usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crt1.o: In function `_start':
/usr/lib/gcc-lib/i386-redhat-linux/2.96/../../../crt1.o(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status
Thanks in advance to anyone who knows the answer and can help me.
Ian

Sorry, Here is the java source I am using:
public class HelloWorld {
public HelloWorld() {
public native void displayHelloWorld();
static {
System.loadLibrary("hello");
public static void main(String[] args) {
new HelloWorld().displayHelloWorld();
}

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Hi,
I don't have much experience with JNI code, so excuse me if I make a silly mistake.
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Everything is working on my station were I have installed VS2005 but when I try to run the
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Has anybody been developing InDesign plugins that use MFC? I would have to use a bunch of functions that rely heavily on MFC. The problem is that now both MFC and InDesign CS6 API want to declare their own CString, ICommand and DLLmain and it creates quite major conflicts. I'm just curious if there is a proven way to prevent these conflicts.

Hi,
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We've encapsulated all access to MFC in a separate DLL.
As per normal with an MFC based DLL you have to restore access to the MFC module globals
using
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Creating JNI DLL on WinXP using MinGW and GCC

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7) Tried a gazilion other gcc options, posted in various messages, none worked.
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$(LINK_TARGET) : $(OBJS)
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Cheers,
mark...
Message was edited by:
voytechs - added CODE tags

Glad my post helped out at least a few people.
Believe it or not, I'm in the same boat now on Linux.
Atleast I know its the name mangling problem again. I
see a few symbols unmangled with nm, but most are,
and those are then one's JNI is complaining about
with UnsatisfiedLinkError.
So now I'm going through various post related to
linux and trying to find the same type of flag. The
"alias" flag doesn't work with RH4 g++ version
4.0.2.You should not need a flag on Linux. A typical compile for me on my Linux box is:
gcc -shared -o libjnitest.so -I/usr/java/jdk1.6.0_01/include -I/usr/java/jdk1.6.0_01/include/linux jnitest.c>
Window builds perfectly fine, but now I'm creating a
new platform target. Everything compiles and creates
the shared library, just can't get JNI to be happy.
BTW, my project: http://jnetpcap.sf.net
Ah. You have .cpp extensions on your filenames. Are you using gcc or g++ to compile? If you don't use g++, you can get errors such as:
undefined symbol: __gxx_personality_v0
Jim S.

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null

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Using AFX_MANAGE_STATE(AfxGetStaticModuleState()) in JNI..

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