Byte array in JSON reply
Hi guys,
I'm exchanging some data between .net webservice and flex
with JSON. This is a JSON reply:
<string>
{"uid":"23","photos":[[255,216,255,224,0,16,74,70,73,70,0,1,1,1,0,72,0,72,0,0,255,219,0,67 ,0,8,6,6,7,6,5,8,7,7,7,9,9,8,10,12,20
</string>
It is serialized this class:
public class UserPhotoBytes
public string uid;
public ArrayList photos;
public UserPhotoBytes()
Where photos is THE ARRAY OF BYTE ARRAYS. Then in Flex I
deserialize it with:
public function
onPhotoReceived(event:GetUserPhotoResultEvent):void
var myImg:Image = new Image();
var rawData:String = String(event.result);
var userPhoto:Object = JSON.decode(rawData) as Object
_user.photos = userPhoto.photos as Array;
myImg.data = _user.photos[0] as ByteArray;
But I think it cannot convert the string value of byte array
of JSON object to real byte representation. Or am I missing
something else ? Thank you very much for the response
Hi,
I am opening the file with wordpad.
when opening the file the output i could see is:
U
wU
w
which is ASCII value I guess. Pls tell me if my guess is wrong & value is in binary format only.I am somewhat confused :O.
As per the client requirement he should get the value in the file as binary format and not as ASCII.
I hope i am not misleading you and hope that now you got what is my problem.
Neha
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i need to transfer a object by datagram packet in embeded system.
i make a code fallowing sequence.
1) convert object to byte array ( i append object attribute to byte[] sequencailly )
2) send the byte array by datagram packet ( by JNI )
but, it's not satisfied my requirement.
it must be finished in 1ms.
but, converting is spending 2ms.
network speed is not bottleneck. ( transfer time is 0.3ms and packet size is 4096 bytes )
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Edited by: JongpilKim on May 17, 2009 10:48 PM
Edited by: JongpilKim on May 17, 2009 10:51 PM
Edited by: JongpilKim on May 17, 2009 10:53 PMthanks a lot for your reply.
now, i use udp socket for communication, but, i must use hardware pci communication later.
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for convert a object to byte array,
i used ObjectInputStream before, but it was so slow.
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int idx = 0;
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but, it's not enough.
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How do i covert an image in J2ME into an byte array ?
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Hello fiends
i am making an application in which i have to send the byte array of an image with 300dpi.
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Passing byte Arrays broken in 1.4?
I have an application that I am porting from 1.2.2 to 1.4. Code that used to work fine is now broken. All byte arrays that are passed through the JNI have each element set to 0.
Is this a known bug, or has something changed in the JNI API? Here is a sample of my code which used to work fine, but is now broken:
From a .h:
* Structure for information about a single target
struct TARGET_INFO_STR
char Name[MAX_TARGET_NAME_SIZE + 1];
char Protocol[MAX_PROTOCOL_NAME_SIZE + 1];
char State[MAX_STATE_SIZE];
int Selected;
int Error;
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* Structure returned for a target request
struct TARGET_LIST_STR
int Target_Count;
int Selected_Count;
struct TARGET_INFO_STR Targets[MAX_TARGETS];
From the JNI C code:
JNIEXPORT void JNICALL Java_merge_jni_mbinterface_C_1Query_1Targets (JNIEnv *A_env,
jobject A_obj)
struct TARGET_LIST_STR Reply;
int i;
jbyteArray name;
jbyte *bptr;
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for (j=0;j<strlen(Reply.Targets[i].Name);j++)
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(*A_env)->CallVoidMethod(A_env, A_obj, mid,
name,
protocol,
state,
(jboolean)Reply.Targets[i].Selected,
(jboolean)Reply.Targets[i].Online,
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(*A_env)->ReleaseByteArrayElements( A_env, retn, bptr, 0 );
(*A_env)->DeleteLocalRef( A_env, name );
(*A_env)->DeleteLocalRef( A_env, protocol);
(*A_env)->DeleteLocalRef( A_env, state);
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return;
Here is the signature of the Java side of this call:
public void J_add_target (byte[] name, String protocol, String state,
boolean selected, boolean online, boolean error) {
The strings and booleans are all passed back fine, the byte array is the proper length, but all of its values are 0.Your call to (*A_env)->ReleaseByteArrayElements( A_env, retn, bptr, 0 );
should be done before the CallVoidMethod call.
Otherwise you will get exactly the effect you describe if the array was copied by GetByteArrayElements instead of it giving you a direct pointer to the array data. This may indeed be a change between the earlier version and 1.3 or 1.4.
Sylvia. -
I have a binary file to be read.I want to read the whole file into a byte array. But while doing so the values which are greater than 128 are read as negative values as we have Signedbyte in java(-127 to 128).
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int i = 0;
int content[]= new int[(int)size];
FileInputStream fstream = new FileInputStream(fileName);
DataInputStream in = new DataInputStream(fstream);
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i++;
The above function 'readUnsignedByte();' reads byte and stores it into an int array.....But since the file contains around 34000 bytes ....the loop runs 340000 times .....which is a performance hazard.
After googling for hours ....I could still not find any alternative ....
I want to read byte and want to store in int array but instead of loop, I want to read the file at once.
Or is there any way to implement Unsigned Byte in java so that I can read the entire file in byte array without corrupting the values which are greater than 128..
I have to deliver the code asap .....Please help me out with an alternative solution for this...
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Actually, I need to take the bytes into an array(int or byte array) with decimal values and further process these decimal values.......
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and while reading the file in int array as done in the below code is inefficient as the number of times the loop runs is more than 34000..... please suggest me some alternative.
int i = 0;
int content[]= new int[(int)size];
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How Do I Load An Animated GIF Into PictureBox Control From Byte Array?
I'm having a problem with loading an animated GIF int a picturebox control in a C# program after it has been converted to a base64 string, then converted to a byte array, then written to binary, then converted to a base64 string again, then converted to
a byte array, then loaded into a memory stream and finally into a picturebox control.
Here's the step-by-step code I've written:
1. First I open an animated GIF from a file and load it directly into a picturebox control. It animates just fine.
2. Next I convert the image in the picturebox control (pbTitlePageImage) to a base64 string as shown in the code below:
if (pbTitlePageImage.Image != null)
string Image2BConverted;
using (Bitmap bm = new Bitmap(pbTitlePageImage.Image))
using (MemoryStream ms = new MemoryStream())
bm.Save(ms, ImageFormat.Jpeg);
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3. Then I write the base64 string to a binary file using FileStream and BinaryWriter.
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5. Next I load the base64 string into a byte array, then I load it into StreamReader and finally into the picturebox control (pbGameImages) as shown in the code below:
byte[] TitlePageImageBuffer = Convert.FromBase64String(GameInfo.TitlePageImage);
MemoryStream memTitlePageImageStream = new MemoryStream(TitlePageImageBuffer, 0, TitlePageImageBuffer.Length);
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This step-by-step will work with all image file types except animated GIFs (standard GIFs work fine). It looks like it's just taking one frame from the animation and loading it into the picturebox. I need to be able to load the entire animation. Does any of
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ImageAnimator.Animate Method
http://msdn.microsoft.com/en-us/library/system.drawing.imageanimator.animate(v=vs.110).aspx
chanmm
chanmm -
Convert XML data to byte array...
Hello All,
In my application, i have an XML file and the corresponding XSD file. This XML file is having some date, which i want to convert into an byte[] and then save it in a file.
How i can convert the XML data in the byte[]? Here as an example of the xml file and the byte[] data which i want to save in a file.
<?xml version="1.0" encoding="utf-8"?>
<HeadersInfo>
<header>
<id>0</id>
<Name>H1</Name>
</header>
<header>
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<Name>H2</Name>
</header>
</HeasersInfo>
In the above example 'id' field is of type 'uint' and 'name' field is of type 'string' with max length of '5'. So in this case my byte array should be as shown below:
00 00 00 01 48 31 00 00 00
00 00 00 02 48 32 00 00 00
Here underlines values are for the 'id' parameter where as values in bold are for 'Name' parameter for all the header values in sequence. Name parameter is null (0x00) padded.
Thanks in advance,
IamHuMHi,
the following example extract the id, name values using LINQ To Xml and writes it to a memory stream using a binary writer and returns the result as a byte array:
internal static byte[] GetXmlAsByteArray()
var document = XDocument.Parse("<HeadersInfo>"
+ " <header><id>1</id><Name>H1</Name></header>"
+ " <header><id>2</id><Name>H2</Name></header>"
// additional testing
+ " <header><id>32767</id><Name>H1234</Name></header>"
+ " <header><id>305419896</id><Name>H56789</Name></header>"
+ "</HeadersInfo>");
const int NameLength = 5; // Max length for a name
byte[] zeroBytes = new byte[NameLength]; // Helper to fill name
using (var ms = new MemoryStream())
using (var writer = new BinaryWriter(ms))
// write each header
foreach (var header in document.Root.Elements("header"))
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string name = (string)header.Element("Name");
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Console.WriteLine("id: {0}, Name: {1}", id, name);
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writer.Write(GetUIntBytes((uint)id));
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Console.Write("{0:X2} ", value);
Console.WriteLine();
return result;
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if (BitConverter.IsLittleEndian)
// swap bytes
value = ((value & 0x00ff) << 24)
| ((value & 0xff00) << 8)
| ((value & 0x00ff0000) >> 8)
| ((value & 0xff000000) >> 24);
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For a general purpose solution you should create a class and split the example into separate methods to extract the data and write the values (integers, strings).
Regards, Elmar -
Convert byte array to table of int
[http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print|http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print] Hello friends.
I'm pretty new with PL/SQL.
I have code that run well on MSSQL and I want to convert it to PL/SQL with no luck.
The code converts byte array to table of int.
The byte array is actually array of int that was converted to bytes in C# for sending it as parameter.
The TSQL code is:
CREATE FUNCTION dbo.GetTableVarchar(@Data image)
RETURNS @DataTable TABLE (RowID int primary key IDENTITY ,
Value Varchar(8000))
AS
BEGIN
--First Test the data is of type Varchar.
IF(dbo.ValidateExpectedType(103, @Data)<>1) RETURN
--Loop thru the list inserting each
-- item into the variable table.
DECLARE @Ptr int, @Length int,
@VarcharLength smallint, @Value Varchar(8000)
SELECT @Length = DataLength(@Data), @Ptr = 2
WHILE(@Ptr<@Length)
BEGIN
--The first 2 bytes of each item is the length of the
--varchar, a negative number designates a null value.
SET @VarcharLength = SUBSTRING(@Data, @ptr, 2)
SET @Ptr = @Ptr + 2
IF(@VarcharLength<0)
SET @Value = NULL
ELSE
BEGIN
SET @Value = SUBSTRING(@Data, @ptr, @VarcharLength)
SET @Ptr = @Ptr + @VarcharLength
END
INSERT INTO @DataTable (Value) VALUES(@Value)
END
RETURN
END
It's taken from http://www.codeproject.com/KB/database/PassingArraysIntoSPs.aspx?display=Print.
The C# code is:
public byte[] Convert2Bytes(int[] list)
if (list == null || list.Length == 0)
return new byte[0];
byte[] data = new byte[list.Length * 4];
int k = 0;
for (int i = 0; i < list.Length; i++)
byte[] intBytes = BitConverter.GetBytes(list);
for (int j = intBytes.Length - 1; j >= 0; j--)
data[k++] = intBytes[j];
return data;
I tryied to convert the TSQL code to PL/SQL and thats what I've got:
FUNCTION GetTableInt(p_Data blob)
RETURN t_array --t_array is table of int
AS
l_Ptr number;
l_Length number;
l_ID number;
l_data t_array;
BEGIN
l_Length := dbms_lob.getlength(p_Data);
l_Ptr := 1;
WHILE(l_Ptr<=l_Length)
loop
l_ID := to_number( DBMS_LOB.SUBSTR (p_Data, 4, l_ptr));
IF(l_ID<-2147483646)THEN
IF(l_ID=-2147483648)THEN
l_ID := NULL;
ELSE
l_Ptr := l_Ptr + 4;
l_ID := to_number( DBMS_LOB.SUBSTR(p_Data, 4,l_ptr));
END IF;
END IF;
l_data(l_data.count) := l_ID;
l_Ptr := l_Ptr + 4;
END loop;
RETURN l_data;
END GetTableInt;
This isn't work.
This is the error:
Error report:
ORA-06502: PL/SQL: numeric or value error: character to number conversion error
06502. 00000 - "PL/SQL: numeric or value error%s"
I think the problem is in this line:
l_ID := to_number( DBMS_LOB.SUBSTR (p_Data, 4, l_ptr));
but I don't know how to fix that.
Thanks,
MTs.I'd found the solution.
I need to write:
l_ID := utl_raw.cast_to_binary_integer( DBMS_LOB.SUBSTR(p_Data, 4,l_ptr));
instead of:
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The performance isn't good, it's take 2.8 sec to convert 5000 int, but it's works. -
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Hi all,
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I am reading an image from a file into a BuffertedImage then writing it out again into an array of bytes which I store and use later on in the program. Currently Im doing this in two stages is there a way to do it it one go to speed things up.
try
//Read File Contents into a Buffered Image
/** BUG 4705399: There was a problem with some jpegs taking ages to load turns out to be
* (at least partially) a problem with non-standard colour models, which is why we set the
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BufferedImage bi = null;
ImageReader ir = null;
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ImageTypeSpecifier typeToUse = null;
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if (type.getColorModel().getColorSpace().isCS_sRGB())
typeToUse = type;
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final ImageWriter iw = ImageIO.getImageWriter(ir);
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If you don't need to manipulate the image in any way I would suggest you just read the image file directly into a byte array (without ImageReader) and then create the BufferedImage from that byte array.
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How do I get a byte array from an object passed into the JNI?
This is what my java code looks like:
public class streamedData
protected byte[] m_value = null;
public byte[] getByteArray ()
return m_value;
/* code not pertaining to this question snipped. */
jclass streamedDataClass = env->GetObjectClass(jstreamedData);
// Get methodIDs for the various NPKI_Extension methods
value = env->GetMethodID(streamedDataClass, "getByteArray", "()[B");
lstreamedData->value = (unsigned char *)malloc (lstreamedData->length);
if (lstreamedData->value == NULL)
return INSUFFICIENT_MEMORY;
memset (lstreamedData->value, 0, lstreamedData->length);
memcpy (lstreamedData->value, env->CallByteMethodA(streamedDataClass, value, NULL), lstreamedData->length);
This is not working.
My question is, how do I get a copy of or read m_value in the JNI layer? Do I have to make the byte array public and access it as a field ID?
Any help would be appreciated. Why oh why can't there be a CallByteArrayMethod????My question is, how do I get a copy of or read m_value in the JNI layer? Do I have to make the byte array public and access it as a field ID?
You can retrieve a handle to the byte array, through a method call, as you're doing now, or by directly accessing it through GetFieldID.
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jbyteArray byteArray = static_cast<jbyteArray>( env->CallObjectMethod( jstreamedData, getByteArrayMethod ) );In the case of field access, you can do:jfieldID m_valueFieldID = env->GetFieldID( streamedDataClass, "m_value", "[B" );
jbyteArray byteArray = static_cast<jbyteArray>( env->GetObjectField( jstreamedData, m_valueFieldID ) );Once you have byteArray, you need to access it using the array operations:lstreamedData->value = env->GetByteArrayElements( byteArray, 0 );
// Do what you want to do, then release the array
env->ReleaseByteArrayElements( byteArray, lstreamedData->value, 0 );As always, Jace, http://jace.reyelts.com/jace, makes this easier. For example,void printByteArray( jobject jstreamedData ) {
streamedData data( jstreamedData );
JArray<JByte> byteArray = streamedData.m_value();
for ( int i = 0; i < byteArray.length(); ++i ) {
cout << byteArray[ i ];
}God bless,
-Toby Reyelts -
How do I store an Int, a short, and multiple bytes from file in byte array
I'm attempting to do this for a project but can't figure out how to store the three values in one byte array. This is what i've tried
public void send(byte[] input)
// TODO
ByteArrayInputStream bais = new ByteArrayInputStream(input);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
DataOutputStream dos = new DataOutputStream(baos);
byte[] pData = new byte[100];
try {
dos.writeShort(checkSum);
dos.writeInt(nextSeqNum);
pData=baos.toByteArray();
bais.read(pData);
} catch (IOException e) {
DatagramPacket dgp = new DatagramPacket(pData, pData.length);When i set pData=baos.toByteArray() it changes the size and then stops me from being able to read the other 94 bytes into the array to send. Any ideas?You don't need the ByteArrayInputStream at all.
dos.writeShort(checkSum);
dos.writeInt(nextSeqNum);
dos.write(input);
pData = baos.toByteArray();
When i set pData=baos.toByteArray() it changes the sizeNo, it makes it refer to a new byte[] array containing what you've written to the BAOS. That's what it's supposed to do.
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