Passing binary files in webservices

I need send binary files in my webservice. And I need it can be used by non java clients. Can I do it? Do you have any example?
Thankss
http://www.hhdirecto.net
http://www.dechiste.com

Umm.. have you tried it?
In order to send any file via a web server, the server maintains a list of MIME types that map document types (e.g. text/plain, image/jpg, video/quicktime, and many, many more).
Additionally, Mac OS X Server ships with an apache module, mime_magic which attempts to automatically determine mime types on more than just the filename suffix (which is the traditional way of doing it).
Therefore, the server should be able to automatically detect the file type, so just create a link for it on your page and click it. If it doesn't work, use Server Admin to check that modmimemagic is enabled, or add a specific mime type for your document.

Similar Messages

Difference in Download Performance Rates Between Binary Files (IE mysql ibd) and Txt file

Hi !
i would thank you if anyone could clarify this to me .
im testing passing traffic from one DC to another DC .
if the file is a text file ie: SpeedTest.txt , i can download in about 20MB/s .
if the file is a binary file ie :SpeedTest.ibd (mysql) , i can download in about 2MB/s .
all tests were made using Rsync on Linux Machines . ( but it also happens with scp/sftp etc )
so i guess its something with encoding or perhaps hashing that is make per "chunk" ?
what is this happening , and if you know , what is the best way to pass binary files ? ( i use rsync because it use multiple sessions thus faster )
Thanks A lot !

Not sure about the exact differences but loading pdf files to view in a browser seems to have a high overhead (as in memory required to load and display the file). For that reason I prefer to view all pdf's in the reader. It's just quicker to load and smoother when scrolling to read.
Simon

Passing a binary file to class outputing a compressed file

Hi,
Am i writing a program which gets passed a file to encode via "java compressor < <filename>".
Compressor is a class with main method.
what i have right now is simply:
public class Compressor {
 * @param args the command line arguments
 public static void main(String[] args) {
 InputStream in = new FileInputStream ("");
 File f = new File ("");
 ByteArrayOutputStream out = new ByteArrayOutputStream (f.length());
 int i;
 while ((i = in.read()) != -1) {
 out.write(i);
 in.close();
 byte[] result = out.toByteArray();
 for (int j = 0 ; i < result.length ; j++) {
 byte a = result[j];
} The program is suppose to read the input one byte at a time and treats each one as an instruction which encodes byte compressoring the file and finally outputing this newly compressed file. I'm not sure how the main method will take the filename i.e "java compressor examplefile", any guidance would help greatly.
Thanks

in the case above, the command line arguments are passed in the aaaaaaaaaaaaaaaaaaaaaaarggggggggggs array
you probably want aaaaaaaaaaaaaaaaaaaaaaarggggggggggs[0] for the filenameAm not sure i understand, do you mean i must change the param of the main method to String[] args[0] as this resulted in error when i did so. Or do you mean at command line instead file simply being passed to the Compressor program as
"java Compressor < examplefilename"
It has to be "java Compressor < examplefilename[0]" ?
If you could expand on this, would be grateful,
Thanks.

How can I open different binary files from BLOB column ?

If we store some type of binary file (XLS, DOC, PDF, EML and so on, not only pictures) in BLOB column how can I show the different contents? We use designer and forms 9i with PL/SQL.
How can I copy the files from BLOB to file in a directory or how can I pass BLOB's content to the proper application directly to open it?

The mime type is just a string as explained above (e.g. application/pdf...). There are lot of samples here and on metalink.
E.g. add a column mime_type varchar(30) to your blob table. Create a procedure similar to the following:
PROCEDURE getblob
(P_FILE IN VARCHAR2
IS
vblob blob;
vmime_type myblobs.mime_type%type;
length number;
begin
     select document, mime_type into vblob,vmime_type from myblobs where docname = p_file;
     length := dbms_lob.getlength(vblob);
     if length = 0 or vblob is null then
     htp.p('Document not available yet.');
     else
     owa_util.mime_header(vmime_type);
     htp.p('Content-Length: ' || dbms_lob.getlength(vblob));
     owa_util.http_header_close;
     wpg_docload.download_file(vblob);
     end if;
exception
     when others then
     htp.p(sqlerrm);
END;
Create a DAD on your application server (refer to documentation on how to create a DAD).
Display the blob from forms (e.g. on a when-button-pressed trigger):
web.show_document('http://myserver:port/DAD/getblob?p_file=myfilename','_blank');
For storing blobs in a directory on your db server take a look at the dbms_lob package.
For storing blobs in a directory on your app server take a look at WebUtil available on OTN.
HTH
Gerald Krieger

Link to binary file stored in CMS?

Hello,
I'm using WebLogic Portal 8.1 SP5 and storing PDF & DOC files as assets in the WebLogic CMS. I'm trying to present links to these files in a portlet (pageflow). I'm currently using the following tags to display the links but am having some difficulty.
<cm:getNode path="/BEA Repository/Folder/SomeFile" id="node"/>
<ad:render id="node"/>
I've also tried using a placeholder but had the same behaviour.
<ol>
<li>The a href text is always "/BEA Repository/Folder/SomeFile". Is it possible to customize this? I'd like to display the file title</li>
<li>The a href URL is /BEA+Repository/Folder/SomeFile. Is it possible to have the URL be the same as the binary file that's stored in the CMS or do I have to explicitly set the asset's name the same as the file itself?</li>
</ol>

Thanks,

Cotter

If you want to create a link to the file in the repository, I suggest you use the ShowBinaryServlet.
From javadoc...
public class ShowBinaryServlet
extends ShowPropertyServlet
Writes a Binary property of a Node to the response OutputStream. The available paramater options are as follows:
# 1) Pass the node Id in as a request parameter. Eg. http://server:port/app/ShowBinary?nodeId=/repo/12345.
# 2) Pass the node path as part of the the request pathInfo. Eg. http://server:port/app/ShowBinary/repo/path/file.ext.
# 3) Pass the node path in as a request parameter. Eg. http://server:port/app/ShowBinary?nodePath=/repo/path/file.ext

Write structure to binary file and append

I have a very simple problem that I cannot seem to figure out, which I guess doesn't make it so simple, for me at least. I've made a little example .vi which basically breaks down what I want to to. I have a structure, in this instance 34 bytes of various data types. I would like to iteratively write this structure to a binary file as the data in the ACTUAL structure in my .vi will be changing through time. I'm having trouble getting the data to be appended to the binary file rather than overwriting it since the file size is always 34 bytes regardless of how many times I run the .vi or run the for loop.
I'm not an expert, but it seems if I write a 34 byte structure to a file 10 times, the final product should be a binary file of 340 bytes (assuming I haven't padded or prepended with size).
One really strange thing is that I keep getting error #1544 when I wire the refnum out wire to the file dialog input on the write function, but it works fine when I wire the file path directly to the write function.
Can someone please swoop in and save me from this remedial task?
Thanks for all the help. NI Forum rules!
Solved!
Go to Solution.
Attachments:
struct_to_bin.vi ‏13 KB

Did you consider reading the text of the error message? Don't set the "disable buffering" input to true - just leave that input unwired. Why do you want to disable buffering?
As a general practice, the file refnum should be stored in a shift register around the for loop instead of using loop tunnels, that way if you have zero iterations you will still get the file refnum passed through correctly. Also, there is no need for Set File Position inside the loop, since the file location is always the end of the last write unless it's specifically moved to another location. You might want it once outside the loop after you open the file, if you're appending to an existing file.

Write to binary file

I have a relatively large 3D array (Phase Settling), which I want to store in a Binary File. The array is a 15000 point sweep (after decimation), repeated up to 48 by 48 times (in two FOR loops, one inside the other), meaning it can end up having as many as 34,560,000 data points. At the moment, I am attempting to dump that 3D array into a Binary File in one go, using the following VI. There are two possile versions of this array (both the same size as each other) and, depending on which has just been tested, they will be written to their own individual file. Once both tests have been run and their results stored, the idea was to open both files, subtract one array from the other, and store the new 3D array to another Binary File whilst also displaying this latest data elsewhere in a higher-level VI.
After its first trial run, LabVIEW presents me with an error message saying something along the lines of "LabVIEW had run out of memory". I assume it would be to do with this VI, since that's where the first error code appeared (Error Code: 2), apparently originating in a 'Write to Binary File' function.
Any ideas as to how I could get round this first hurdle, or perhaps an alternative method I could try?
Thank you.
- James
Message Edited by James Mamakos on 04-08-2010 10:07 AM
Never say "Oops." Always say "Ah, interesting!"
Attachments:
Running out of LabVIEW memory when writing to binary file.PNG ‏30 KB

Well, as shown in the attached screen-shot, the error indicator shows an error code of 2, and that the error occurred in one of the Write to Binary File functions.
However, when trying to save this particular VI after a couple of tweaks, I was presented with the following pop-up alert message:
LabVIEW: Memory is full.
Cannot save VI "Compare Amp - calculate.vi".
LabVIEW Save error code 10: Default data space.
Anyway, returning back to the main problem at hand, I've though of a couple of possible solutions...
We don't really need a particularly high resolution to the data points for the comparison, so I could convert the array doubles into an array of singles to save space.
I should be able to implement the 'Write to Binary File' for the initial arrays into the outer FOR loop, thereby reducing the amount data written in each instance by a factor of up to 48. The only problem I can foresee in this is that I'm not sure how to append 2D arrays into a binary file such that, when the file is read, they would appear as (or be easily converted into) a 3D array.
As for the 'True' case in my case structure, am I being grossly inefficient in my passing of data from one place to the next? I know there are a lot of branches (and buffers?) of 3D arrays; is there a decent way to reduce this overhead by tweaking the data paths or something?
- James
P.S. The computer I'm using has 1GB RAM.
Message Edited by James Mamakos on 04-08-2010 12:39 PM
Never say "Oops." Always say "Ah, interesting!"
Attachments:
LabVIEW - error code 2.PNG ‏35 KB

How can I read a binary file?

In my AIR application, I'm trying to read a binary file and then post it via an HTTPService to a remote ColdFusion component that accepts a "binary" type argument. The result of the post is always:
The FILEOBJ argument passed to the addFile function is not of type binary.
Here is how I'm reading the file in Flex, where fileObj is of type File:
var fs : FileStream = new FileStream();
var bytes : ByteArray = new ByteArray();
fs.open(fileObj, FileMode.READ);
fs.readBytes(bytes, 0, fs.bytesAvailable);
fs.close();
I then pass "bytes" as the parameter to my HTTPService's send call, like so:
var params : Object = {method : "addFile", fileObject : bytes};
service.send(params);
When I debug, bytes contains the correct file size. Is it not in binary form? I've tried several other suggestions, but with the same result, so would appreciate any help.
Thanks!

One more step...
short are U16 integer
double are double precision float
bool seem to be 2 bytes (= U16)
char are string (variable length)
rgb are U16 integer, with high order byte = 0
rect should be 4 x U16 (top, left, bottom, right)
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...

Binary file compare

I'm sorry. I didn't want to have to post here, but I've been banging my head on this all week. Hopefully somebody here can shed some light on this for me.
I'm trying to write an application that compares a series of binary files in a user-defined order. The user needs to be able to specify the type of change that has occured ( > < = !, and numerical searches) for a given byte. (I am also supporting WORD/DWORD, but it's the same principal) To clarify, imagine:
Byte at given offset: (((fileA < fileB) = fileC) != fileD) ...
Now, my original code worked, but it was extremely poor. It had two methods fullCompare() and partialCompare(), it read data directly from the DataInputStream, and used skipBytes() to pass over bytes that had been excluded from a previous search. I kept thinking "There has to be a better way to do this." So I made it as simple as possible! I created an inner class called BinaryFile. BinaryFile reads the data (using getUnsignedByte() getByte() getUnsignedShort() getShort() etc... depending on the user's option.
I created two instances of this class... One I call 'result' and the other 'bin' the files are read in by the constructor and stored in an ArrayList<Integer> (later I cast my Shorts to int)
Now, 'result' holds the first file opened, and bin holds each additional file, ex:
BinaryFile result = new BinaryFile("C:\\test1.bin", BinaryFile.UNSIGNED_WORD);
All of this works�. OK, so now I run my first compare:
compare(new BinaryFile("C:\\test2.bin", BinaryFile.UNSIGNED_BYTE), GREATER_THAN);
again, everything works like a champ.. now to actually compare the files, I do this:
public void compare(BinaryFile bin, int compareType) {
for (int count=0; count < results.values.size(); count++) {
if (results.values.get(count) != null) {
switch (compareType) {
case GREATER_THAN:
if (bin.values.get(count) > results.values.get(count))
results.values.set(count, bin.values.get(count));
else
results.values.set(count, null);
break;
��..
Now, it works for the FIRST two files that I compare, but after that it's like it started setting null when it wasn't supposed to�. I know that nobody probably read this far, but somebody please help me, this is killing me.

I posted that at some unruly hour of the morning, while tired and frustrated... I had a flight from Korea to Japan today and spent the entire trip reading J2SE 5 docs about collections and generics, etc... So I'm going to give this one more go-round before I ask for help. I hate being beaten by a machine, asking for help makes me feel like I lost!
Thanks

"Read From Binary File" function Help ambiguity

I must be getting tired, but for some reason a doubt crept in my mind as I was designing a new piece of code this morning:
"is the "Read From Binary File" using the last file position or is it starting from the beginning of the file?"
"That's a stupid question", I told myself.
"I used this function a million times and have always assumed it is reusing the last file position. Moreover, there is no file offset input to that function, so WTH am I afraid of?"
So, for kicks, I fired up the Help window and read the following description (*):
Reads binary data from a file and returns it in data. How the data is read depends on the format of the specified file. This function does not work for files inside an LLB.
(*) BTW, has anybody ever complained that you can't select and copy anything from the floating Help Window?
Not much there. I particularly admire the phrasing of the second sentence... What about: "This function can do a lot of things, but it would much to complex to describe this is extensive details, so if you are asking, you probably can't afford using it"?
Anyhow, I clicked on the "Detailed Help" and got this (among other things):
Use the Set File Position function if you need to perform random access.
WHAT? I am pretty darn sure I DO NOT USE the Set File Position when I read a file in successive and contiguous chunks. I just pass the file refnum into a shift register and back to the function and that's it.
Now, the description of the "Refnum Out" ouput says: If file is a refnum or if you wire refnum out to another function, LabVIEW assumes that the file is still in use until you close it. Translated in plain English, is that supposed to mean that if the file is not closed it is open, or is that implying that it contains more info that just "the file is open and can be found here"?
I started searching around and finally ended up with the entry for "refnums, file I/O". Down the bottom of the (long) article, I found this under the heading "References to Objects or Applications" (but nothing specific to files, BTW):
...LabVIEW creates a refnum associated with that file, device, or network connection...
[...] LabVIEW remembers information associated with each refnum, such as the current location for reading from or writing to the object and the degree of user access, so you can perform concurrent but independent operations on a single object. If a VI opens an object multiple times, each open operation returns a different refnum. LabVIEW automatically closes refnums for you when a VI finishes running, but it is a good programming practice to close refnums as soon as you are finished with them to most efficiently use memory and other resources.
So it seems that my recollection was correct. I do not know what the "degree of user access" for a file is, but that's not the topic of today's post.
So, my point is: the Help File for this function is incomplete or ambiguous at best. Please correct it. And provide a link to the "refnum, file I/O" Help entry in its detailed Help. It would H E L P...
Thanks for reading.

Reading in succesive chunks is *NOT* random access. An open file always has
a current position, which is updated with each read or write operation.
You only need to set the file position if you want to start elsewhere.
LabVIEW Champion . Do more with less code and in less time .

Urgent - pls help - Problem while inserting binary file into Oracle DB

Hi,
I am trying to insert binary files into a Blob column in a Oracle 10G table.
The binary files would be uploaded by the web users and hence come as multipart request. I use apache commons upload streaming API to handle it. Finally i am getting a input stream of the uploaded file.
The JDBC code is
PreparedStatement ps=conn.prepareStatement("insert into bincontent_table values(?)");
ps.setBinaryStream(1,inStream,length);
My problem starts when i try to find the length of the stream. available() method of inputstream does not return the full length of the stream. so i put a loop to read thru the stream and find the length as shown below
int length=0;
while((v=inStream.read())!=-1)
length++;
Now, though i got the length, my stream pointer has reached the end and i cant reset it(it throws an error if i try).
So i copied the stream content to a byte array and created an ByteArrayInputStream like this.
tempByteArray=new byte[length];
stream.read(tempByteArray,0,length);
ByteArrayInputStream bais=new ByteArrayInputStream(tempByteArray);
Now if i pass this bytearray input stream instead of the normal input stream to the prepared statement's setBinaryStream() method it throws an error as
"ORA-01460: unimplemented or unreasonable conversion requested".
Now how to solve this?
My doubts are ,
1) preparedStatement.setBinaryStream(int parameterIndex, InputStream x, int length) expects an inputstream and its length. if i have the stream how to find its length with out reading the stream?
2) Also as the length parameter is a integer, what if i have a large binary file whose length runs more than the capacity of integer
3) Alternatively there is a setBlob(int i, Blob x) in prepared statement. But how to instantiate a Blob object and set it here
4) Is there any better way to do this.
Thanks in advance

"ORA-01460: unimplemented or unreasonable conversion
requested".When the setBinaryStream method is used, the driver may have to do extra work to determine whether the parameter data should be sent to the server as a LONGVARBINARY or a BLOB (reference: javadoc)
1) preparedStatement.setBinaryStream(int parameterIndex,
InputStream x, int length) expects an inputstream and its length. if i
have the stream how to find its length with out reading the stream?no. stream may have no specified length. i think you have wrong understanding about stream.
2) Also as the length parameter is a integer, what if i have a large
binary file whose length runs more than the capacity of integer
3) Alternatively there is a setBlob(int i, Blob x) in prepared statement.
But how to instantiate a Blob object and set it here
4) Is there any better way to do this.use ps.setBlob(1, instream) instead

UTL_FILE write_error when writing large binary files to unix os

I am trying to write large files to a folder in unix from a table containing a BLOB object. The procedure below is called by another procedure I have written to do this. It works in windows environment fine with files up to 360MB. When I run this exact same procedure in UNIX I get an initialization error. When I change the WB in the fopen call to W it works. I can store all the files I want up to 130MB in size. The next size larger file I have is 240MB and it fails after writing the first 1KB passing the utl_file.write_error message. If someone can help me to diagnose the problem, I would really appreciate it. i have been trying everything I can think of to get this to work.
Specifics are, the windows version is 10GR2, on unix we are running on Sun Solaris 9 using 9iR2
PROCEDURE writebin(pi_file_name IN VARCHAR2, pi_file_url IN VARCHAR2, pi_file_data IN BLOB)
IS
v_file_ref utl_file.file_type;
v_lob_size NUMBER;
v_raw_max_size constant NUMBER := 32767;
v_buffer raw(32767);
v_buffer_offset NUMBER := 1;
-- Position in stream
v_buffer_length NUMBER;
BEGIN
-- WB used in windows environment. W used in unix
v_lob_size := dbms_lob.getlength(pi_file_data);
v_file_ref := utl_file.fopen(pi_file_url, pi_file_name, 'WB', v_raw_max_size);
v_buffer_length := v_raw_max_size;
WHILE v_buffer_offset < v_lob_size
LOOP
IF v_buffer_offset + v_raw_max_size > v_lob_size THEN
v_buffer_length := v_lob_size -v_buffer_offset;
END IF;
dbms_lob.READ(pi_file_data, v_buffer_length, v_buffer_offset, v_buffer);
utl_file.put_raw(v_file_ref, v_buffer, TRUE);
v_buffer_offset := v_buffer_offset + v_buffer_length;
END LOOP;
utl_file.fclose(v_file_ref);
END writebin;
Message was edited by:
user599879

check if this cample code helps -
CREATE OR REPLACE PROCEDURE prc_unload_blob_to_file IS
vlocation VARCHAR2(16) := ‘LOB_OUTPUT’;
vopen_mode VARCHAR2(16) := ‘w’;
bimax_linesize NUMBER := 32767;
v_my_vr RAW(32767);
v_start_pos NUMBER := 1;
v_output utl_file.file_type;
BEGIN
FOR cur_lob IN (SELECT vmime_type,
blob_resim,
vresim,
dbms_lob.getlength(blob_resim) len
FROM tcihaz_resim a
WHERE rownum < 3 -- for test purposes
ORDER BY a.nresim_id) LOOP
v_output := utl_file.fopen(vlocation,
cur_lob.vresim,
vopen_mode,
bimax_linesize);
dbms_output.put_line(’Column length: ‘ || to_char(cur_lob.len) || ‘ for file: ‘ ||
cur_lob.vresim);
v_start_pos := 1;
IF cur_lob.len < bimax_linesize THEN
dbms_lob.READ(cur_lob.blob_resim,
cur_lob.len,
v_start_pos,
v_my_vr);
utl_file.put_raw(v_output,
v_my_vr,
autoflush => TRUE);
dbms_output.put_line(’Finished Reading and Flushing ‘ || to_char(cur_lob.len) ||
‘ Bytes’ || ‘ for file: ‘ || cur_lob.vresim);
ELSE
dbms_lob.READ(cur_lob.blob_resim,
bimax_linesize,
v_start_pos,
v_my_vr);
utl_file.put_raw(v_output,
v_my_vr,
autoflush => TRUE);
dbms_output.put_line(’Finished Reading and Flushing ‘ || to_char(cur_lob.len) ||
‘ Bytes’ || ‘ for file: ‘ || cur_lob.vresim);
END IF;
v_start_pos := v_start_pos + bimax_linesize;
WHILE (v_start_pos < bimax_linesize) LOOP
-- loop till entire data is fetched
dbms_lob.READ(cur_lob.blob_resim,
bimax_linesize,
v_start_pos,
v_my_vr);
utl_file.put_raw(v_output,
v_my_vr,
autoflush => TRUE);
dbms_output.put_line(’Finished Reading and Flushing ‘ ||
to_char(bimax_linesize + v_start_pos - 1) || ‘ Bytes’ ||
‘ for file: ‘ || cur_lob.vresim);
v_start_pos := v_start_pos + bimax_linesize;
END LOOP;
utl_file.fclose(v_output);
dbms_output.put_line(’Finished successfully and file closed’);
END LOOP;
END prc_unload_blob_to_file;
set serveroutput on
set timing on
create or replace directory LOB_OUTPUT as ‘/export/home/oracle/tutema/’;
GRANT ALL ON DIRECTORY LOB_OUTPUT TO PUBLIC;
exec prc_unload_blob_to_file ;
Column length: 3330 for file: no_image_found.gif
Finished Reading and Flushing 3330 Bytes for file: no_image_found.gif
Finished successfully and file closed
Column length: 10223 for file: OT311.gif
Finished Reading and Flushing 10223 Bytes for file: OT311.gif
Finished successfully and file closed
PL/SQL procedure successfully completedWith 9iR2 PLSQL can write binary files using UTL_FILE put_raw function, prior to Oracle9iR2 you will need to create an external procedure with Java, C, VB or some 3gl language.
Some references -
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:6379798216275
Oracle® Database PL/SQL Packages and Types Reference 10g Release 2 (10.2)
UTL_FILE - http://download-uk.oracle.com/docs/cd/B19306_01/appdev.102/b14258/u_file.htm#sthref14095
http://psoug.org/reference/dbms_lob.html
Metalink Note:70110.1, Subject: WRITING BLOB/CLOB/BFILE CONTENTS TO A FILE USING EXTERNAL PROCEDURES

How can I pass a file refnum into and out of external c++ code? What type does it convert to in c++?

I am trying to write external c++ code that will read a file already opened by Labview and therefore assigned a refnum. (Unfortunately, I definately can't use the standard Labview vis.) However I am not sure what c++ type to use in order to manage the refnum.
All help and thoughts appreciated. Thanks,
Joanna

You could do ALL your file handling in C or C++ (MFC CFile for
example) and pass Microsoft file handles into and out of LabVIEW
instead of LabVIEW file references into and out of C. This may be an
easier way to attack the problem.
You could create a DLL in MSVC that exports a FileOpen function, a
FileClose function and a FileRead and/or FileWrite Function and then
call that DLL from place to place as required in your code.
It would help us if you would explain what kind of data you are trying
to read or write and what the application is. Is it binary data?
text files? Do you need some special Win32 file system feature like
file mapped memory? I guess what I am asking is what is your
motivation for doing file handling in C or C++?
Douglas De Clue
LabVIEW developer
[email protected]
"Rolf" wrote in message news:...
> A LabVIEW file refnum is an internal Magic Cookie to LabVIEW and there is no
> way to directly extract the actual information assigned to that Magic
> Cookie.
> However the CIN Reference Manual describes one function which allows to
> retrieve a lower level "File" handle and at least on Windows 32 bit and
> LabVIEW
> from version 5 up to and including 6.1 this "File" LabVIEW datatype directly
> maps
> to the Win32 API "FILE" Handle.
>
> The function to use is
>
> MgErr FRefNumToFD(LVRefNum refNum, File *fdp);
>
> It is declared in extcode.h or one of its dependant headers and exported
> from "labview.lib"
> all located in the cintools directory and you can link this lib also to a
> normal DLL project.
> However calling this DLL then from any other process than LabVIEW or a
> LabVIEW
> executable will not initialize the DLL anymore correctly.
>
> Your best option if you need to write in C(++) should be to use the LabVIEW
> file manager
> functions described on the External Code Manual (manual/lvexcode.pdf) on
> this File handle.
> If you need to use directly some Win32 API functions with it please note
> that although currently
> the "File" in the LabVIEW file manager functions matches the FILE in Windows
> 32 bit API
> functions this is an undocumented and hence unsupported feature. The next
> LabVIEW version
> may actually use a different datatype for its "File" parameter to the
> LabVIEW file manager calls
> and your use of assuming File == FILE may simply crash.
>
> Also operating on a file refnum in LabVIEW which has been accessed directly
> with Win API
> functions may result in strange behaviour such as the file read/write mark
> not being updated as
> you would maybe expect it.
>
> "Jo" wrote in message
> news:50650000000800000016520000-1023576873000@exchange.ni.com...
> > How can I pass a file refnum into and out of external c++ code? What
> > type does it convert to in c++?
> >
> > I am trying to write external c++ code that will read a file already
> > opened by Labview and therefore assigned a refnum. (Unfortunately, I
> > definately can't use the standard Labview vis.) However I am not sure
> > what c++ type to use in order to manage the refnum.
> > All help and thoughts appreciated. Thanks,
> > Joanna

Problem saving 2D array to binary file

I am getting some strange results when trying to write a transposed 2D array of Unisgned 8-bit data to a binary file. Attached is an example program ("071026_ArraySave_Bug.vi") which demonstrates the suspicious behavior.
The program generates a small 2D array of U8 data, then saves it to two temporary files using two different methods.
1) Row-by-row: The 2D array is auto-indexed, and the indexed row is written to file at once (with the prepended size option disabled).
2) Point-by-point: Two For loops are used to auto-index each element and write it to file individually.
The saved files are then reopened and the data is read into two 1D arrays for display.
The bug occurs when the generated 2D array is transposed before being saved to file. In the point-by-point method, the data is always saved to the file as desired, i.e. by row or by column depending on whether the data was transposed. However, in the row-by-row method the data is incorrectly saved when the input data is transposed. Without transposing the array, the row-by-row results are correct.
Saving the array row-by-row is significantly faster for larger arrays, so this method is desired.
Note that the option to transpose the input data in the attached VI is performed using a case structure with a boolean constant ("Bug Control"). This is important because:
1) The bug does not occur if the boolean constant is replaced with a control.
2) The bug does not occur if the case structure is replaced with a "Select" node from the Comparison Palette.
3) The bug still occurs if the case structure is removed such that the array is always transposed (i.e. keep the True case).
For now, I have been able to circumvent the bug in practice by transposing the array and then passing it through a Select with a constant True (the False case uses the untransposed array). This allows the faster row-by-row method to be used without error, but requires new memory allocation for the transposed array.
I will appreciate any help that can be given regarding this problem, or simply confirmation that it is indeed a bug in Labview 8.5. It is worth noting that the same program did not produce any errors when run in Labview 7.
Thank you for your help,
David Viggiano
Attachments:
071026_ArraySave_Bug.vi ‏29 KB

This is a known bug (CAR : 4DP855N3) , related to memory management. see this thread
If I remember well, Altenbach shown somewhere that forcing the transpose operation to produce a copy of the memory was a proper workaround.
Message Edité par chilly charly le 10-26-2007 08:40 PM
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...
Attachments:
071026_ArraySave_Bug[1].png ‏2 KB

Passing xml to rpc webservice

We need to pass a fairly large xml file to our webservice. In the wsdl file we use anyType and the webservice method the parameter type is XmlObject. This seems to work except for the additional namespaces added as attributes to the first element. The parser does not like that. Any help or direction is much appreicated.
thanks,
Rick

Anurag,
I think I've sent the information as you requested, if you need more or are not
able to help please let me know. I know you are busy and I do appreciate your
help, and I will be patient, but if this is a dead end I need to know.
thanks
Rick
"Rick" <[email protected]> wrote:
>
Anurag, Is there something else you need?
thanks,
Rick
"Rick" <[email protected]> wrote:
thanks Anurag,
Not using a Service Control.
Here is the contents of the jws file and instructions of how to reproduce
the
behavior:
import weblogic.jws.control.JwsContext;
import java.io.*;
* @jws:protocol soap-style="rpc" http-xml="true"
public class OmService
implements com.bea.jws.WebService
/** @jws:context */
JwsContext context;
* This is the default constructor.
public OmService() {
* @jws:operation
public String submit(com.bea.xml.XmlObject clientXml) {
return "result";
Create a webservice application with the above code.
Put a breakpoint on the retrun statement of the submit method.
then select Debug -> Start, go to Test XML and enter <test> this isa
test </test>
between the clientXml tags.
Hit submit
On the breakpoint look at clientXml (XMLObject)
<test xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:open="http://www.openuri.org/"
xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"> this is
a
test </test>
thanks again Anurag I apprecitae your time and effort
Rick
"Anurag" <[email protected]> wrote:
Rick,
Could you please attach a sample of the XML which is passed on to your
webservice? Are you using a Service Control to invoke your webservice
and
passing an XmlObject to the service control?
Regards,
Anurag
"Rick Nichols" <[email protected]> wrote in message
news:[email protected]...
We need to pass a fairly large xml file to our webservice. In thewsdl
file we use anyType and the webservice method the parameter type is
XmlObject. This seems to work except for the additional namespacesadded
as
attributes to the first element. The parser does not like that. Any
help
or direction is much appreicated.
thanks,
Rick

Passing binary files in webservices

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