How can i write a blog in the XI forum.....
i want to write a blog....
i have created a scenario which i feel ...may be helpful for many...
how can i write that in the XI forum.....
and do my blog need to examined by some authority
Hi,
Check this
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/community/gettingStartedWith+Blogs&
Regards,
Chandra
Similar Messages
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How can I write new objects to the existing file with already written objec
Hi,
I've got a problem in my app.
Namely, my app stores data as objects written to the files. Everything is OK, when I write some data (objects of a class defined by me) to the file (by using writeObject method from ObjectOutputStream) and then I'm reading it sequencially by the corresponding readObject method (from ObjectInputStream).
Problems start when I add new objects to the already existing file (to the end of this file). Then, when I'm trying to read newly written data, I get an exception:
java.io.StreamCorruptedException
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
Is there any method to avoid corrupting the stream? Maybe it is a silly problem, but I really can't cope with it! How can I write new objects to the existing file with already written objects?
If anyone of you know something about this issue, please help!
JaiHere is a piece of sample codes. You can save the bytes read from the object by invoking save(byte[] b), and load the last inserted object by invoking load.
* Created on 2004-12-23
package com.cpic.msgbus.monitor.util.cachequeue;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
* @author elgs This is a very high performance implemention of Cache.
public class StackCache implements Cache
protected long seed = 0;
protected RandomAccessFile raf;
protected int count;
protected String cacheDeviceName;
protected Adapter adapter;
protected long pointer = 0;
protected File f;
public StackCache(String name) throws IOException
cacheDeviceName = name;
f = new File(Const.cacheHome + name);
raf = new RandomAccessFile(f, "rw");
if (raf.length() == 0)
raf.writeLong(0L);
* Whne the cache file is getting large in size and may there be fragments,
* we should do a shrink.
public synchronized void shrink() throws IOException
int BUF = 8192;
long pointer = getPointer();
long size = pointer + 4;
File temp = new File(Const.cacheHome + getCacheDeviceName() + ".shrink");
FileInputStream in = new FileInputStream(f);
FileOutputStream out = new FileOutputStream(temp);
byte[] buf = new byte[BUF];
long runs = size / BUF;
int mode = (int) size % BUF;
for (long l = 0; l < runs; ++l)
in.read(buf);
out.write(buf);
in.read(buf, 0, mode);
out.write(buf, 0, mode);
out.flush();
out.close();
in.close();
raf.close();
f.delete();
temp.renameTo(f);
raf = new RandomAccessFile(f, "rw");
private synchronized long getPointer() throws IOException
long l = raf.getFilePointer();
raf.seek(0);
long pointer = raf.readLong();
raf.seek(l);
return pointer < 8 ? 4 : pointer;
* (non-Javadoc)
* @see com.cpic.msgbus.monitor.util.cachequeue.Cache#load()
public synchronized byte[] load() throws IOException
pointer = getPointer();
if (pointer < 8)
return null;
raf.seek(pointer);
int length = raf.readInt();
pointer = pointer - length - 4;
raf.seek(0);
raf.writeLong(pointer);
byte[] b = new byte[length];
raf.seek(pointer + 4);
raf.read(b);
--count;
return b;
* (non-Javadoc)
* @see com.cpic.msgbus.monitor.util.cachequeue.Cache#save(byte[])
public synchronized void save(byte[] b) throws IOException
pointer = getPointer();
int length = b.length;
pointer += 4;
raf.seek(pointer);
raf.write(b);
raf.writeInt(length);
pointer = raf.getFilePointer() - 4;
raf.seek(0);
raf.writeLong(pointer);
++count;
* (non-Javadoc)
* @see com.cpic.msgbus.monitor.util.cachequeue.Cache#getCachedObjectsCount()
public synchronized int getCachedObjectsCount()
return count;
* (non-Javadoc)
* @see com.cpic.msgbus.monitor.util.cachequeue.Cache#getCacheDeviceName()
public String getCacheDeviceName()
return cacheDeviceName;
} -
How can I write more voices using the score editor?
I'm writing a guitar piece with the score editor but I need to voices; the voice below should be a semibreve and the voice above a dotted minim and then a crotchet, how do I do it?
Hi, here is one way to do this:
http://help.apple.com/logicpro/mac/10/#lgcp8535c140
…..let us know if you need more assistance.
Cheers! -
Hello
I keep getting an error message when I write the following
<?if:LanguagePreference_ID335='F'?><?'Numéro d’inscription TVQ'?><?end if?>
Is there anyway to write this code and keep the apostraphy?try as below:
<?if:LanguagePreference_ID335='F'?><?'Numéro d?’inscription TVQ'?><?end if?>
Cheers
AJ -
How can I Write a sine wave in an Access-file?
I measure a sine wave in LabView 6i. How can I write the datas automatically to an Acces-file, at the same time?
In my program, I managed it with Execute SQL.vi, I change a number in a SQL statement(String) -> after this I push start and then it writes the statement in the Access-file.
The problem is, it writes only one data per measurement in the file. How can I write all datas in the Access-file and measure the wave at the same time?
Thanks for help!
Attachments:
getwave.vi 49 KBOn the waveform palette, you will find a "to components" vi that you can break out the array of the waveform. You can then, using a for loop write all of the values from the waveform.
Better yet, there are examples in the database toolkit manual on pages 3-13 to 3-15 that deal with reading arrays (and even has a waveform example).
Good luck! -
How can i write the below code using "For all entries"
Hi
How can we write the below code using "for all entries" and need to avoid joins...
Please help
SELECT aaufnr aobjnr aauart atxjcd a~pspel
agstrp awerks carbpl cwerks
INTO TABLE t_caufv
FROM caufv AS a
INNER JOIN afih AS b
ON aaufnr = baufnr
INNER JOIN crhd AS c
ON bgewrk = cobjid
AND c~objty = 'D'
WHERE ( a~pspel = space
OR a~txjcd = space
OR NOT a~objnr IN
( select OBJNR from COBRB AS e
WHERE objnr = a~objnr ) )
AND a~werks IN s_plant
AND a~auart IN s_wtype
AND NOT a~objnr IN
( select OBJNR from JEST AS d
WHERE objnr = a~objnr
AND ( dstat = 'A0081'OR dstat = 'A0018' )
AND d~inact 'X' ).
Reward points for all helpfull answers
Thanks
Ammi.Hi,
SELECT objnr objid aufnr
from afih
into table t_afih.
SELECT objnr
from JEST
into table t_JEST
where stat = 'A0045'
OR stat = 'A0046'
AND inact 'X'.
SELECT objnr
from COBRB
into table t_cobrb.
SELECT arbpl werks objid objty
from crhd
INTO table it_crhd
FOR ALL ENTRIES IN it_afih
WHERE objty eq 'D'
AND gewrk = it_afih-objid.
SELECT aufnr objnr auart txjcd pspel gstrp werks aufnr
FROM caufv
INTO table t_caufv
FOR ALL ENTRIES IN it_afih
WHERE aufnr = it_afih-aufnr
And pspel = ' '
AND txjcd = ' '
ANd objnr ne it_crhd-objnr
AND auart in s_wtype
AND werks in s_plant.
AND objnr ne it_jest-objnr.
dont use NE in the select statements, it may effect performance also. Instead use if statements inside
loops.
loop at t_caufv.
read table it_chrd............
if t_caufv-objnr ne it_chrd-objnr.
read table it_jest..........
if if t_caufv-objnr ne it_jest-objnr.
(proceed further).
endif.
endif.
endloop.
hope this helps.
Reward if useful.
Regards,
Anu -
How can i write and read the same data
hi,
i have attached my program to this mail. i have some problems in this program.
problems:
1. I want to select the threshold for the rms,varience and s.d.
But what i used is not doing that. i want to fix the upper threshold value and lower threshold value.
when ever the input crosses upper threshold value i want the output and it will remains uptill the value above the lower threshold value.
Once it come down the lower threshold value the output should be stopped.
2. I want to write this in to a file and i want to read this file. is this possible or not.
please try to help me i am very new with lab view6i
REGARDS
CHAMARTHY KOMAL DILEEP.
[email protected]
Attachments:
dileep.vi 93 KBThe easiest way to perform a certain action (such as file I/O) based on a certain condition (such as whether a value has passed a certain threshold) is to use a comparison VI in combination with a case structure. Then you can specify that if your rms, standard deviation and variance are above a threshold then perform a certain action.
Also consider using shift registers to keep track of data from the last loop. If I understand you correctly, you want to start logging data when an upper threshold has been passed. Then you want to continue logging data until a lower threshold is passed. I have attached a non-functional but explanatory VI that will help explain how to implement logic to that effect. It also demonstrates that you can indeed write and read from the same file in a loop. The best way to do this is to open the file before the loop, do all the necessary writing and reading in the loop, and then close the file after the loop.
Hope this helps!
Jarrod S.
National Instruments
Attachments:
dileep_example.vi 61 KB -
How can we write the code for opening the command prompt and closing the
how can we write the code in java for opening the command prompt and closing the cmd prompt from eclipse (cmd prompt should close when click on the turminate button in eclipse)
rakeshsikha wrote:
how can we write the code for opening the command prompt and closing theBy typing in Eclipse (which you seemingly have)? -
How can i write the floats value in Unitronics vision230 plc using modbus Ethernet
How can i write the Float value in unitronics Vision230 PLC usinsg modbus ethernet (MB Ethernet Master Query.vi) I read and write the 32 bit register, for e.g i want to write the 23.45 value on 2nd add. of MF. And MF register is 32 bit register. I read and write the 32 bit register.
Narendra.
Solved!
Go to Solution.Thanks Amit for your solution but i can not use the string to write the value because MB Ethernet master Query.vi only accepet the integer value its not take string values or any other i.e floats values etc.....otherwise i have no problem to write or read the 32 bit register values , only problem is that the MB Ethernet master Query.vi only accept the integer value there4 how can write the float value.
Narendra
Message Edited by Artemistech on 01-30-2009 11:06 PM -
How can i write the trigger for Global Temporary Table
Hi Grus,
How can i write the trigger for Global Temporary Table.
I was created the GTT with trigger using the below script .
CREATE GLOBAL TEMPORARY TABLE GLOBAL_TEMP
EMP_C_NAME VARCHAR2(20 BYTE)
ON COMMIT PRESERVE ROWS;
CREATE OR REPLACE TRIGGER TRI_GLOBAL_TEMP
BEFORE DELETE OR UPDATE OR INSERT
ON GLOBAL_TEMP
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
INSERT INTO EMPNAME VALUES (:OLD.EMP_C_NAME);
END;
trigger was create successfully, but the wouldn't insert into to EMPNAME Table..
Please guide whether am correct or not? if not kindly give a correct syntax with example
Thanks in Advance,
Arun M MBEGIN
INSERT INTO EMPNAME VALUES (:OLD.EMP_C_NAME);
END;
you are referencing old value in insert stmt.
BEGIN
INSERT INTO EMPNAME VALUES (:new.EMP_C_NAME);
END;then run ur application it works fine...
CREATE GLOBAL TEMPORARY TABLE GLOBAL_TEMP
EMP_C_NAME VARCHAR2(20 BYTE)
ON COMMIT PRESERVE ROWS;
CREATE OR REPLACE TRIGGER TRI_GLOBAL_TEMP
BEFORE DELETE OR UPDATE OR INSERT
ON GLOBAL_TEMP
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
dbms_output.put_line(:OLD.EMP_C_NAME||'yahoo');
INSERT INTO EMPNAME VALUES (:new.EMP_C_NAME);
dbms_output.put_line(:OLD.EMP_C_NAME);
END;
create table EMPNAME as select * from GLOBAL_TEMP where 1=2
insert into GLOBAL_TEMP values('fgfdgd');
commit;
select * from GLOBAL_TEMP;
select * from EMPNAME;
output:
1 rows inserted
commit succeeded.
EMP_C_NAME
fgfdgd
1 rows selected
EMP_C_NAME
fgfdgd
1 rows selectedgot it Arun
Edited by: OraclePLSQL on Dec 28, 2010 6:07 PM -
How can I write bits through the COM1 serial port?
I'm trying to write bits through the serial port COM1.
Labview "Write VI" only writes everything in string. It seems. How can I write bit by bit through COM1?
Thank you,
VanSerial transmission (COM port) protocol requires sending a group of bits at one time. You cannot just send one bit. Standard COM port settings must be either 7 or 8 data bits, 1 or 2 stop bits, etc... You have to group your bits 7 or 8 at a time. You could probably send a 0 byte or a 1 byte. This would be like sending 0000 0000 for a low bit and 0000 0001 for a high bit. Your receiving end would have to know how to interpret what you are sending if you choose this method. Of course you have to convert your byte into a string before sending to COM port. Wire a U8 data type to a Build Array input. Then wire the array output to a Byte Array to String input. The output of this function will be the character representation of your byte suitable for sending acr
oss a serial port.
- tbob
Inventor of the WORM Global -
How can i write the data to PIC16F819 using labview?
how can i write the data to PIC16F819 using labview?
Need help!
im using labview in gathering the datas that i need to right to the PIC, then after getting all the datas i am using another program which is ICD2 in order to write it to the PIC. Is it possible to do this task through LV? coz we are spending a lot of time transferring the data from LV to ICD2 manually and its prone to mistake as well.
any suggestion?
thanks,
PedzLabVIEW does not currently have a built-in method to communicate with
i2c, but there are other vendors that sell devices to communicate in
this manner with LabVIEW development kits. One that I know of is
from MCC... here is a link: http://www.mcc-us.com
They sell a device called iPort, and then you can buy LabVIEW VIs to go with it. I hope this is helpful to you!
john m -
I want to wrtie some ECPM code
but I don't know how can i write code in IViewo
How to install or enable EPCF development enviroment
Where should i write the EPCF code?Hi,
Try this link for EPCF:
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/documents/a1-8-4/enterprise portal client.pdf
<b>Regards,
Sai Krishna.
PS: Plz do assign points if it helps. ;-)</b> -
How can I write the analogous code to the logic:iterate tag functionality
Hai This is Rayalu .And I am very new to the Java World. I have a doubt?.How can I write the analogous code to the<logic:iterate> tag functionality using the JSP Tag Libraries . Pleae Send me some examples .
Hi,
SELECT objnr objid aufnr
from afih
into table t_afih.
SELECT objnr
from JEST
into table t_JEST
where stat = 'A0045'
OR stat = 'A0046'
AND inact 'X'.
SELECT objnr
from COBRB
into table t_cobrb.
SELECT arbpl werks objid objty
from crhd
INTO table it_crhd
FOR ALL ENTRIES IN it_afih
WHERE objty eq 'D'
AND gewrk = it_afih-objid.
SELECT aufnr objnr auart txjcd pspel gstrp werks aufnr
FROM caufv
INTO table t_caufv
FOR ALL ENTRIES IN it_afih
WHERE aufnr = it_afih-aufnr
And pspel = ' '
AND txjcd = ' '
ANd objnr ne it_crhd-objnr
AND auart in s_wtype
AND werks in s_plant.
AND objnr ne it_jest-objnr.
dont use NE in the select statements, it may effect performance also. Instead use if statements inside
loops.
loop at t_caufv.
read table it_chrd............
if t_caufv-objnr ne it_chrd-objnr.
read table it_jest..........
if if t_caufv-objnr ne it_jest-objnr.
(proceed further).
endif.
endif.
endloop.
hope this helps.
Reward if useful.
Regards,
Anu -
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You can do it with a trackpad but I am not sure about the mouse. Take a look at his link, http://support.apple.com/kb/HT4288
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