Char * to byte[]

suppose i have a char * being passed into a C function. I then want to convert that to a byte[] to pass into my JNI call, which is done in the same function. how do i do that? i have tons of ideas, but i can't get them to coagulate. thanks

JNI gives you functions for constructing java arrays. The function you are after is
jbyteArray NewByteArray(env, length);
Once you have done this, you should be able to loop through the char* and the byte array, populating the array.
There is a certain amount of handwaving in this explanation. You will have to read up on accessing array elements.
A good book on all this JNI stuff is
essential JNI, by Rob Gordon.

Similar Messages

How can i convert an object to stream of chars or bytes?

how can i convert an object to stream of chars or bytes?

One way is the serialization mechanism. There are examples and explanations of it in the Java tutorial: http://java.sun.com/docs/books/tutorial/essential/io/serialization.html

Conversion from char to byte

can anybody to convert char which is unicode in java as one byte. i want to print that byte as ascii.
i tried below method.
char temp='s';
ByteBuffer buff= ByteBuffer.wrap(some byte array of some size);
buff.putChar(temp);
out.writeByte(buff.getChar()); // out is my dataoutput stream which
// stores in some file by using
// fileoutputstream.
in some case i got right output like: s
but in some case i got: sX where X=white space.
so it's still writing as unicode eventhough i called writeByte.
i want to change my program little bit by putting char as byte and not as char in bytebuffer and i want to do something like this after i store my chars as byte
out.writeByte(buff.getByte());
do you have any method to convert char to byte and store it in buff?
thanks a lot.

Try the toBytes() method of the String class.

Invalid UTF-8 middle byte 0x6f (at char #3309, byte #2895)

Hello Oracle Support/ SOA Experts,
Please guide me on how to resolve this issue.
Issue Description : We are using ATG,Oracle SoA SUite 11g as the Front and Middleware applications for our current website project.The project is basically for latin america(Portuguese Language) and we are facing encoding issue while sending the request from ATG(Front End) to SOA (Middleware).We have an SOA-xsd [customer.xsd) that contains FirstName,LastName,MiddleName as elements.Front End application(ATG) sends the customer xsd in ISO-8859-1 encoding format as we understood that only encoding format for sending the portuguese names is this format.Front is able to send the request to SOA Without any issues however the only format which SOA Suite accepts in our BPEL process is UTF-8 and hence we are seeing this invalid UTF-8 error.Can anyone of you please explain us on how to resolve this issue or please guide us which encoding format can we use for passing portuguese characters from front end to SOA Suite.
*Exception*:
java.lang.RuntimeException: [com.ctc.wstx.exc.WstxLazyException] com.ctc.wstx.exc.WstxIOException: Invalid UTF-8 middle byte 0x6f (at char #3309, byte #2895): [com.ctc.wstx.exc.WstxLazyException] com.ctc.wstx.exc.WstxIOException: Invalid UTF-8 middle byte 0x6f (at char #3309, byte #2895)
What we tried :
Since ATG or front end is using the ISO-8859-1 format to send the request to SOA,we tried to use the encoding format in all the SOA BPEL XSD but we are unable to deploy after changing the encoding and we see the below error :
Exception:
Redeploying on /Farm_soa2_domain/soa2_domain/soa_server1 ...
Redeploying on "/Farm_soa2_domain/soa2_domain/soa_server1" failed!
Error during deployment/undeployment: oracle.mds.transfer.TransferException:
MDS-00001: exception in Metadata Services layer
MDS-00521: error while reading document /deployed-composites/default/ManageCustomerOrderOrchestration_rev1.0/xsd/ManageContract.xsd from metadata repository
IS0-8859-1
IS0-8859-1
MDS-00001: exception in Metadata Services layer
MDS-00521: error while reading document /deployed-composites/default/ManageCustomerOrderOrchestration_rev1.0/xsd/ManageContract.xsd from metadata repository
IS0-8859-1
IS0-8859-1

Hello Oracle Support/ SOA Experts,
Please guide me on how to resolve this issue.
Issue Description : We are using ATG,Oracle SoA SUite 11g as the Front and Middleware applications for our current website project.The project is basically for latin america(Portuguese Language) and we are facing encoding issue while sending the request from ATG(Front End) to SOA (Middleware).We have an SOA-xsd [customer.xsd) that contains FirstName,LastName,MiddleName as elements.Front End application(ATG) sends the customer xsd in ISO-8859-1 encoding format as we understood that only encoding format for sending the portuguese names is this format.Front is able to send the request to SOA Without any issues however the only format which SOA Suite accepts in our BPEL process is UTF-8 and hence we are seeing this invalid UTF-8 error.Can anyone of you please explain us on how to resolve this issue or please guide us which encoding format can we use for passing portuguese characters from front end to SOA Suite.
*Exception*:
java.lang.RuntimeException: [com.ctc.wstx.exc.WstxLazyException] com.ctc.wstx.exc.WstxIOException: Invalid UTF-8 middle byte 0x6f (at char #3309, byte #2895): [com.ctc.wstx.exc.WstxLazyException] com.ctc.wstx.exc.WstxIOException: Invalid UTF-8 middle byte 0x6f (at char #3309, byte #2895)
What we tried :
Since ATG or front end is using the ISO-8859-1 format to send the request to SOA,we tried to use the encoding format in all the SOA BPEL XSD but we are unable to deploy after changing the encoding and we see the below error :
Exception:
Redeploying on /Farm_soa2_domain/soa2_domain/soa_server1 ...
Redeploying on "/Farm_soa2_domain/soa2_domain/soa_server1" failed!
Error during deployment/undeployment: oracle.mds.transfer.TransferException:
MDS-00001: exception in Metadata Services layer
MDS-00521: error while reading document /deployed-composites/default/ManageCustomerOrderOrchestration_rev1.0/xsd/ManageContract.xsd from metadata repository
IS0-8859-1
IS0-8859-1
MDS-00001: exception in Metadata Services layer
MDS-00521: error while reading document /deployed-composites/default/ManageCustomerOrderOrchestration_rev1.0/xsd/ManageContract.xsd from metadata repository
IS0-8859-1
IS0-8859-1

Form English Char ( Single Byte ) TO Double Byte ( Japanese Char )

Hello EveryOne !!!!
I need Help !!
I am new to Java ,.... I got assignment where i need to Check the String , if that string Contains Any Non Japanse Character ( a~z , A~Z , 0 -9 ) then this should be replaced with Double Byte ( Japanese Char )...
I am using Java 1.2 ..
Please guide me ...
thanks and regards
Maruti Chavan

hello ..
as you all asked Detail requirement here i an pasting C code where 'a' is passed as input character ..after process it is giving me Double Byte Japanese "A" .. i want this to be Done ..using this i am able to Convert APLHA-Numeric from singale byte to Doubel Byte ( Japanse ) ...
Same program i want to Java ... so pleas guide me ..
#include <stdio.h>
int main( int argc, char *argv[] )
char c[2];
char d[3];
strcpy( c, "a" ); // a is input char
d[0] = 0xa3;
d[1] = c[0] + 0x80;
printf( ":%s:\n", c ); // Orginal Single byte char
printf( ":%s:\n", d ); // Converted Double Byte ..
please ..
thax and regards
Maruti Chavan

Char to byte translation

If I would like to use the new java.util.logging.FileHandler and I would like to use this FH to log binary data, that is plain data, not text (by means of a "BinaryFormatter" that wraps the byte[] into a String), how can I make sure that the outputfile generated contains exactly the bytes as wrapped into the string and not a result of a conversion (char->byte) that is a result of the encoding defined in
Sys.prop. file.encoding.
Of course I can write my own FileHandler etc. but I would like to use the std. stuff as much as possible.
In short it comes down to: what characterset has a one-to-one mapping
for every value [0..255]?
Greetings,
Gouweloos

In short it comes down to: what characterset has a one-to-one mapping for every value [0..255]?You can play with this:
char[] chrs = new char[255]; // or 256
for(int j=0;j<chrs.length;j++){
chrs[j]=(char)j;
String str = new String(chrs);
byte[] byts = str.getBytes("UTF8");//here is the point: try many other character sets
System.out.print("byte array length: ");
System.out.println(byts.length);
for(int j=0;j<byts.length;j++){
System.out.print(byts[j]);
System.out.print(" ");
System.out.println();

OWB-Import does not distinguish between nls_length_semantics char and byte.

We have a 10g-DB with UTF8 charset and nls_length_semantics=char and we've created an OWB warehouse module for 10g with several tables in it. After deploy operation for a table the column length attributs are looking nice. But if we re-import this table the varchar fields have the threefold length!
This makes life hard for us, because sometimes it's necessary to reconcile discrepancies in development cycle and some tables have about 150 columns.
Does anybody have suggestions?
The OWB version is 10.1.0.3.0.
Regards
Ralf

Ralf,
Oracle stores the length of VARCHAR columns in two ways in its metadata. One is the length as required by the application, and the other is the length required to store UTF data.
One UTF character can take upto 3 characters of storage. When OWB reads in the definition from data dictionary, it uses the actual characters allocated to the column, and thus u see a three fold increase in VARCHAR columns.
Try this for your table
select
column_name, data_length, char_length
from
user_tab_columns
where
table_name='nameOfTable'
And that is how Oracle designed the database, but unfortunately OWB does not have that twin way of seeing things.
- Jojo

Is a char 1 byte or 2 bytes in java ???

Is it one or two ???
Thank you

Is it one or two ???A char in Java is a 16-bit Unicode 2.0 character.
It's a fundamental fact of the Java language. It you
haven't access to this kind of basic information you
can as well stop trying.the 1.4.1 API says 3.0
Character information is based on the Unicode
Standard, version 3.0.The Java Language specification states: "The integral types are .......... and char, whose values are 16-bit unsigned integers representing Unicode characters". So the version number isn't in the specification. I guess there will be a version 4.0 some day.

Difference between CHAR & BYTE with respect to Storage

Hi,
I HAVE CREATED THREE TABLES WITH DIFFERENT STORAGE FORMATS.
SQL> CREATE TABLE A
2 (ENAME CHAR);
Table created.
SQL> CREATE TABLE AA
2 (ENAME CHAR(1 CHAR));
Table created.
SQL> CREATE TABLE AAA
2 (ENAME CHAR(1 BYTE));
WHEN I AM TRYING TO INSERT THE VALUES
CASE1) INSERTING A SINGLE CHARACTER ONLY
SQL> INSERT INTO A
2 VALUES
3 ('A');
1 row created.
SQL> INSERT INTO AA
2 VALUES
3 ('A');
1 row created.
SQL> INSERT INTO AAA
2 VALUES
3 ('A');
1 row created.
INSERTING MORE THAN ONE CHARACTER IN AAA TABLE
SQL> INSERT INTO AA
2 VALUES
3 ('AA');
('AA')
ERROR at line 3:
ORA-12899: value too large for column "RAVI1"."AA"."ENAME" (actual: 2, maximum:
1)
SQL> INSERT INTO AAA
2 VALUES
3 ('AAA');
('AAA')
ERROR at line 3:
ORA-12899: value too large for column "RAVI1"."AAA"."ENAME" (actual: 3,
maximum: 1)
please can any one tell me the differences.
Thanks & Regards
SAI***BABA

This one might help: Re: What is the difference between VARCHAR2(5 BYTE) & VARCHAR2(5 CHAR)?
Jim P.

Help needed in understanding conversion alghorithm from byte to hex

Hi, I'm studying the following code:
public static char[] byteToHex(byte[] data) {
char[] retValue = new char[data.length * 2];
int value = 0;
int highIndex = 0;
int lowIndex = 0;
for (int i = 0; i < retValue.length; i++) {
    value = (data[i] + 256) % 256;
    highIndex = value >> 4;
    lowIndex = value & 0x0f;
    retValue[i * 2 + 0] = hexTable[highIndex];
    retValue[i * 2 + 1] = hexTable[lowIndex];
return retValue;
}There are few things (the most important) which I don't understand about the above code.
I understood that what's returned has got double size related to what's passed in because a char takes 16 bits while a byte takes 8.
1) I don't understand why each byte must be first added 256 and then % with 256 (returning the same value - Is this to eliminate negative values?)
2) I do understand that each byte is transformed in two hexadecimal values: one is the highIndex (first 8 bits) and the second is the lowerIndex (last 8 bits) and that each value is tranformed in its hexadecimal value from the array of hex values.
3) What I don't really understand is why the highIndex is calculated as: value >> 4
and the lowest index is calculated as value 0x0f (is this last also to eliminate negative values?)
If someone could clarify this for me, I'd be very grateful.
Thanks.
Marco

So, does this mean that we add 256 to eliminate the sign?No. You need the whole line to convert a signed byte into an int between 0 and 255.
A simpler way to do this would be
value = data[i] & 0xFF;
This moves down the higher bits so that it turnsinto lower bits. i.e. we need it to >be between 0 and
15.
Is this shifted of 4 because Math.pow(2, 4) = 16.0?Doing in this case, x >>4 is the same as x / 16
This leaves only the lowest 4 bits.Is the following what happens?There are no char values produced. Using 0000 as an example is not a good idea as you can change it in many ways and it is still 0000
>
Received as initial value:
byte: 0000 0000
What we need to obtain:
char: 0000 0000 0000 0000
The first 4 bits of the above byte are shifted of 4
positions to find the hexadecimal equivalent (if from
2 I want to get to 16 I have to do the opposite of
powering a number by 4); The last four bits of the
byte are extracted because of the '&' operator with
0x0f (which in binary is 1111 - Therefore all the '1'
are kept)?Yes.

How to calculate byte size of a string

Hi forum;
Can you tell me how can I calculate byte count of a string.

Tahir wrote:
I read somewhere that string 0123456789ABCDEFFEDCBA987654321089ABCDEF01234567 is 192 bit. Where as it is 48 Byte (one char = 1 byte) or 384 Bits. But 192*2=384. So whats this math? Any pointer?It depends what you mean by "byte count", because it's likely to depend on the character encoding you choose, but the definitive answer is probably to use getBytes(). For example:
String s = "0123456789ABCDEFFEDCBA987654321089ABCDEF01234567";
System.out.println(s.getBytes("utf8").length);displays 48, but
System.out.println(s.getBytes("unicode").length);displays 98.
Not quite sure why the extra 2 bytes, but I'm sure someone else will know.
Winston

Replace char on String

Hi All,
String strValue = "ABC TPT 0694";
My String is as shown above, I am looking for a way to replace char at byte 6 (position 6) with another Char in String.
For example at location 6 it is "T" I want to replace it with char "O". can any one tell me how to do this

String strValue = "ABC TPT 0694";
char[] chars = strValue.toCharArray();
chars[5] = 'O';
strValue = String.valueOf(chars);

Exchanging non ASCII bytes by socket tcp

Hello:
I'm trying to exchange characters between 0-255 of ascii characters table. I'm using the CharToByteConverter and ByteToCharConverter classes on my client/server programs, but I can't get it.
The client/server programs use socket tcp, but I'm not sure the data structures that I must to use in order to send bytes with these characteristics (0-255 ascii characters)
For example I need to send the next array to server program:
char[] car = new char[15];
car[0] = (char)129;
car[1] = (char)12;
car[2] = (char)201;
car[3] = (char)1;
car[4] = (char)48;
car[5] = (char)48;
car[6] = (char)1;
car[7] = (char)1;
car[8] = (char)95;
car[9] = (char)4;
car[10] = (char)17;
car[11] = (char)3;
car[12] = (char)22;
car[13] = (char)38;
car[14] = (char)53;
Note: In UDP protocol (socket UDP) the interchange data and the conversions work correctly.
Any comment will be appreciated, regads,
Ulises

You are right. The modem is a device that works (send
and recive) with tcp/ip or UDP/IP protocol (is a
modem GPRS). So, I can simulate him with a java
program sending data by socket tcp/ip. In this case
is the same.
The format message is a fact. I can't to choose it.Then that is the message that you are dealing with.
Presumably this is because you are only writing the client or server and not both.
>
My problem is that, for example, I'm waiting (my java
program with server socket tcp/ip actually) for a
byte 129 how first byte, but instead of it, I receive
a byte 63.
Then one of the following is true.
- You are using a class that you should not be, like DataInputStream or String.
- Your understanding of the message protocol is incorrect (perhaps because the spec is wrong.)
- Or the message that is being sent is wrong but presumably there is nothing that you can do about that.
Sockets send and receive bytes. They don't send and receive characters.
Now it could be that the data being sent is indeed characters but that has nothing to do with the socket. It doesn't transform them, map them, nor touch them in any way.
In addition, depending of the data structure used
(char [] or byte []) how buffer, I lose some bytes.Then either you are doing something wrong (like using the buffer size rather than the read size) or the message protocol is very ill defined. If the second then you will have to develope a fuzzy algorithm to guess at the correct behavior.

CharBuffer view on ByteBuffer and No Bytes Written to SocketChannel

Hi,
I've actually got two problems that might be connected. I'm new to the java.nio.* package. I wanted to try SocketChannel's to see if I could improve performance.
If this isn't the appropriate place for java.nio questions, just let me know.
My first problem is that I create a ByteBuffer by allocating x number of bytes. These bytes are the length of the message I want to send to the server. Then, I attempt to get a CharBuffer view of the ByteBuffer (buffer.asCharBuffer). For some reason, it only returns a CharBuffer with half the capacity of the ByteBuffer. So of course, when I stuff my String into the CharBuffer, it doesn't fit.
Well, I hack that and make the ByteBuffer twice as big. Which brings me to problem two, my SocketChannel does not write any bytes to the server when told to.
Here's the code (with hack):
          ByteBuffer buf;
          CharBuffer cbuf;
          SocketChannel sockChan;
          try {
               int msgLength = message.length();
               logger.info("Message length=" + msgLength);
               logger.info("message length in bytes=" + message.getBytes().length);
               buf = ByteBuffer.allocateDirect(msgLength*2);
               logger.info("position=" + buf.position());
               logger.info("capacity=" + buf.capacity());
               logger.info("limit=" + buf.limit());
               cbuf = buf.asCharBuffer();
               logger.info("capacity of cbuf=" + cbuf.capacity());
               cbuf.put(message);
               buf.flip();
               sockChan = SocketChannel.open();
               sockChan.configureBlocking(true);
               sockChan.socket().setSoTimeout(TIMEOUT_MS);
               logger.info("socket configured");
               sockChan.connect(new InetSocketAddress(ipAddress, portNumber));
               int numBytesWritten = sockChan.write(buf);
               logger.info("connected and wrote message. NumBytes writen=" + numBytesWritten);
               if (numBytesWritten != msgLength) {
                    //throw error
                    logger.error("The number of bytes written do not match the " +
                         "message length (in bytes).");
          } catch (IOException e1) {
               // TODO Auto-generated catch block
               e1.printStackTrace();
          }And the console outputs the following:
[Dec 13, 11:46:17] INFO - Message length=50
[Dec 13, 11:46:17] INFO - message length in bytes=50
[Dec 13, 11:46:17] INFO - position=0
[Dec 13, 11:46:17] INFO - capacity=100
[Dec 13, 11:46:17] INFO - limit=100
[Dec 13, 11:46:17] INFO - capacity of cbuf=50
[Dec 13, 11:46:17] INFO - socket configured
[Dec 13, 11:46:17] INFO - connected and wrote message. NumBytes writen=0
[Dec 13, 11:46:17] ERROR - The number of bytes written do not match the message length (in bytes).My batch program freezes at this point. Don't know why it does that either.
Thanks for any help,
CowKing

ByteBuffer (buffer.asCharBuffer). For some reason, it
only returns a CharBuffer with half the capacity of
the ByteBuffer.The reason is simply that chars are twice as big as bytes, so you can only get half as many of them into the same space. The capacity of a ByteBuffer is measured in bytes. The capacity of a CharBuffer is measured in chars. The capacity of a DoubleBuffer is measured in doubles.
Well, I hack that and make the ByteBuffer twice as
big. Which brings me to problem two, my SocketChannel
does not write any bytes to the server when told to.As it says in the Javadoc for ByteBuffer, a view buffer has its own position, limit, and mark. When you put data into it the data goes 'through' into the underlying ByteBuffer but the revised position/limit do not. You have to do that yourself manually, remembering to multiply by two as above to account for the difference widths of chars and bytes.

Strange behaviour of JDBC query for CHAR column

Hi,
I have a simple table with char type and several records in the table.
create table char_test(str char(50));
insert into char_test values ('abc');
insert into char_test values ('abc ');
insert into char_test values ('abc ');
In JDBC, if I have a query like
PreparedStatement st = conn.prepareStatement("select str from char_test where str = 'abc'");
ResultSet rs = st.executeQuery();
All three rows will be returned.
However, If I use parameter for the PreparedStatment, nothing will be returned if the value of the parameter is passed as "abc".
PreparedStatement st = conn.prepareStatement("select str from char_test where str = ?");
st.setString(1, "abc");
ResultSet rs = st.executeQuery();
Personally, I think this is a bug of Oracle JDBC driver. Could anybody please give me any explanation?
Thanks,
Bill
PS. I'm using Oracle 10g Release 2 DB and ojdbc14.jar under jdk 1.5.

Hello Bill,
Have you solved your problem ?
I have encountered a similar one and found a strange behavior of JDBC driver for PrepareStatement : in some cases, deep in JDBC driver, the parameter values could'nt be convert and are send as null values to the server.
Here are partial driver logs, the first for a program which works fine and the second for one which turns on error.
============================
<record>
<date>2006-09-06T16:27:43</date>
<millis>1157552863218</millis>
<sequence>335</sequence>
<logger>oracle.jdbc.conversion</logger>
<level>FINE</level>
<class>oracle.jdbc.driver.DBConversion</class>
<method>javaCharsToCHARBytes</method>
<thread>10</thread>
<message>DBConversion.javaCharsToCHARBytes(chars[]= (26 bytes):
00 0c 00 65 00 78 00 70 00 73 00 74 00 6f 00 0a 00 73 00 6c
00 65 00 65 00 70 , charOffset=1, bytes[]= (7 bytes):
00 00 00 00 00 00 00 , byteOffset=0, cs=178, nchars=6)</message>
</record>
<record>
<date>2006-09-06T16:27:43</date>
<millis>1157552863218</millis>
<sequence>336</sequence>
<logger>oracle.jdbc.conversion</logger>
<level>FINE</level>
<class>oracle.jdbc.driver.DBConversion</class>
<method>javaCharsToCHARBytes</method>
<thread>10</thread>
<message>DBConversion.javaCharsToCHARBytes(chars, nchars, bytes[], cs): returned 6</message>
</record>
=============================
javaCharsToCHARBytes gets 6 characters OK
=============================
<record>
<date>2006-09-06T16:12:32</date>
<millis>1157551952843</millis>
<sequence>333</sequence>
<logger>oracle.jdbc.conversion</logger>
<level>FINE</level>
<class>oracle.jdbc.driver.DBConversion</class>
<method>javaCharsToCHARBytes</method>
<thread>10</thread>
<message>DBConversion.javaCharsToCHARBytes(chars[]= (40 bytes):
00 26 00 73 00 74 00 6f 00 72 00 61 00 67 00 65 00 5f 00 53
00 74 00 6f 00 72 00 65 00 2e 00 71 00 75 00 65 00 72 00 79 , charOffset=1, bytes[]= (20 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 , byteOffset=0, cs=178, nchars=19)</message>
</record>
<record>
<date>2006-09-06T16:12:32</date>
<millis>1157551952843</millis>
<sequence>334</sequence>
<logger>oracle.jdbc.conversion</logger>
<level>FINE</level>
<class>oracle.jdbc.driver.DBConversion</class>
<method>javaCharsToCHARBytes</method>
<thread>10</thread>
<message>DBConversion.javaCharsToCHARBytes(chars, nchars, bytes[], cs): returned 0</message>
</record>
=============================
javaCharsToCHARBytes gets 0 characters instead of 19
But I am unable to discover the differences between the 2 programs in the JDBC driver usage.
Does this sounds familiar to someone ?
François

Char * to byte[]

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