12 messages in net.java.dev.jna.usersRe: [jna-users] problem with useMemory()
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evgeni shafranMay 27, 2008 11:46 pm 
Paul LoyMay 28, 2008 2:04 am 
evgeni shafranMay 28, 2008 2:21 am 
Paul LoyMay 28, 2008 3:05 am 
Paul LoyMay 28, 2008 3:07 am 
evgeni shafranMay 28, 2008 3:36 am 
Paul LoyMay 28, 2008 3:40 am 
Paul LoyMay 28, 2008 3:44 am 
evgeni shafranMay 28, 2008 3:50 am 
Paul LoyMay 28, 2008 3:52 am 
Paul LoyMay 28, 2008 3:55 am 
evgeni shafranMay 28, 2008 3:57 am 
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Subject:Re: [jna-users] problem with useMemory()Actions...
From:evgeni shafran (yavj@gmail.com)
Date:May 28, 2008 3:36:35 am
List:net.java.dev.jna.users

i geting it from shared memory. the main program looks like this: public class test { static Pointer sharedMemPointer ; static SharedData sd; public interface CLibrary extends Library{ CLibrary INSTANCE = (CLibrary) Native.loadLibrary( "c", CLibrary.class);

void printf(String format, Object... args); Pointer shmat(int shmid, final Pointer shmaddr, int shmflg); int shmget(int key, int size, int shmflg);

}

public static void main(String[] args) { ConnectToMemmory();

} public static void ConnectToMemmory() {

sd= new SharedData(); int memId = CLibrary.INSTANCE.shmget((0x7a6d2000&0xffffff00)|28,36497932 , 00001000|0777); sharedMemPointer = CLibrary.INSTANCE.shmat(memId, null, 0);

sd.useMemory(sharedMemPointer); System.out.println(sd.toString()); }

public static byte[] getByteRGBbyIndex(int indexID) { int arraySize=352*288*3;// shuld be taken from db return sharedMemPointer.getByteArray(arraySize*indexID, arraySize); } }

On Wed, May 28, 2008 at 1:05 PM, Paul Loy <kete@gmail.com> wrote:

The structure looks fine to me. Where are you getting the pointer from? It may be that your function call is incorrect.

On Wed, May 28, 2008 at 10:21 AM, evgeni shafran <yavj@gmail.com> wrote:

tnx, i works now, but it still return junk, i think it because i didnt build the structure right, my c structure is: *

typedef **enum*

{

IDLE,

PREALARM,

ALARM,

ALERT,

TAPE

} State;

*

typedef **struct*

{

*int* size;

*bool* valid;

*bool* active;

*bool* signal;

State state;

*int* last_write_index;

*int* last_read_index;

time_t last_image_time;

*int* last_event;

*int* action;

*int* brightness;

*int* hue;

*int* colour;

*int* contrast;

*int* alarm_x;

*int* alarm_y;

*char* control_state[256];

} SharedData;

and because i didnt know how to translate enum i translated it to int my java struc look like this: public class SharedData extends Structure { public int size; public boolean valid; public boolean active; public boolean signal; public int state; public int last_write_index; public int last_read_index; public int last_image_time; public int last_event; public int action; public int brightness; public int hue; public int colour; public int contrast; public int alarm_x; public int alarm_y; public byte[] control_state= new byte[256]; @Override protected void useMemory(Pointer m) { super.useMemory(m); super.read(); } }

please tell me what i need to fix here. tnx in advense

On Wed, May 28, 2008 at 12:04 PM, Paul Loy <kete@gmail.com> wrote:

Don't you have to then call super.read(); ?

On Wed, May 28, 2008 at 7:46 AM, evgeni shafran <yavj@gmail.com> wrote:

hey, i trying to get structure from shared memory. the code compiles but it dont actualy reads from memory

import com.sun.jna.Library; import com.sun.jna.Native; import com.sun.jna.Pointer; import com.sun.jna.Structure;; /** Simple example of native library declaration and usage. */ public class test { static Pointer sharedMemPointer ; static SharedData sd; public interface CLibrary extends Library{ CLibrary INSTANCE = (CLibrary) Native.loadLibrary( "c", CLibrary.class);

void printf(String format, Object... args); Pointer shmat(int shmid, final Pointer shmaddr, int shmflg); int shmget(int key, int size, int shmflg);

}

public static void main(String[] args) { ConnectToMemmory();

} public static void ConnectToMemmory() { sd= new SharedData(); int memId = CLibrary.INSTANCE.shmget((0x7a6d2000&0xffffff00)|28,36497932 , 00001000|0777); sharedMemPointer = CLibrary.INSTANCE.shmat(memId, null, 0); sd.useMemory(sharedMemPointer); System.out.println(sd.toString()); }

public static byte[] getByteRGBbyIndex(int indexID) { int arraySize=352*288*3;// shuld be taken from db return sharedMemPointer.getByteArray(arraySize*indexID, arraySize); } }

import com.sun.jna.Pointer; public class SharedData extends Structure { enum State { IDLE, PREALARM, ALARM, ALERT, TAPE } public int size; public boolean valid; public boolean active; public boolean signal; public int state; public int last_write_index; public int last_read_index; public int last_image_time; public int last_event; public int action; public int brightness; public int hue; public int colour; public int contrast; public int alarm_x; public int alarm_y; public byte[] control_state= new byte[256]; @Override protected void useMemory(Pointer m) { super.useMemory(m); } @Override protected void useMemory(Pointer m, int offset) { super.useMemory(m, offset); } }

why dont it reads from memory?

--

--------------------------------------------- Paul Loy pa@keteracel.com http://www.keteracel.com/paul

--

--------------------------------------------- Paul Loy pa@keteracel.com http://www.keteracel.com/paul