Fastest way to check if a file exists

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• UTL_FILE. OPEN_FILE question to check if a file exists and is not empty

  Hello
  
  I'm writing a code in 3 separate files are created based on certain conditions of parameter for the call of the extract.
  Say that the parameters are NULL, 'A' and 'B '.
  When the Null State is passed to the call of the extract then it should create file A and B if the records are found. If this isn't the case, then create empty files.
  It is possible that the setting of the extract is just 'A', then it would create a file say no zero and B with file from scratch.
  Now when the extract is called with the parameter 'B' and if the file already exists and is not empty then I shouldn't touch/crash with empty folders.
  Is there a simple way I can do this to check if a file exists and is not empty?
  
  I use
  OPEN_FILE
  (gv_utl_file_path
  lv_file_name
  lv_file_handle
  );
  
  Help, please.
  Thank you

  @OP: no need to open

  SQL> declare
    2   lb_file_exist boolean;
    3   ln_size number;
    4   ln_block_size number;
    5  begin
    6   sys.utl_file.fgetattr('TEST_DIR','a.txt',lb_file_exist,ln_size,ln_block_size);
    7   if lb_file_exist then
    8    dbms_output.put_line('a Exists');
    9    dbms_output.put_line(to_char(ln_size));
   10   else
   11    dbms_output.put_line('a Not Exists');
   12   end if;
   13   sys.utl_file.fgetattr('TEST_DIR','b.txt',lb_file_exist,ln_size,ln_block_size);
   14   if lb_file_exist then
   15    dbms_output.put_line('b Exists');
   16    dbms_output.put_line(to_char(ln_size));
   17   else
   18    dbms_output.put_line('b Not Exists');
   19   end if;
   20   sys.utl_file.fgetattr('TEST_DIR','c.txt',lb_file_exist,ln_size,ln_block_size);
   21   if lb_file_exist then
   22    dbms_output.put_line('c Exists');
   23    dbms_output.put_line(to_char(ln_size));
   24   else
   25    dbms_output.put_line('c Not Exists');
   26   end if;
   27  end;
   28  /
  a Exists
  0
  b Exists
  3
  c Not Exists
  
  PL/SQL procedure successfully completed.
  

  Published by: JAC on March 30, 2012 01:21

• How can I check if a file exists in the CVI real-time?

  Also, it would be nice if designated so help file functions have been supported in real time or now.

  I tried this:

  If (GetFileAttrs (DataFileName, NULL, NULL, NULL, NULL) == - 1).

  You can check if a file exists in the CVI real-time using GetFileInfo.

  CVI provides a list of the available functions in the CVI real-time here: CVI real-time functions

• Check if certain files exist

  Hi all
  
  I wrote a reference guide and I was wondering if I can check if certain files exist on a page.
  If it exists then I can send the user to a page.
  And if not, they will see another page.
  Grateful if someone points me to the right direction.
  
  Thank you
  Karen

  Hello Cognethos,

  You must use the double backslashes in your path of the file reference. Your script is OK except this line:
  If (FSO. FileExists ("C:\Program Files\Common Files\My file.txt Directory\My"))

  It should read this:
  If (FSO. FileExists ("file.txt C:\\Program Program Files\\My Directory\\My"))

  The technical reason for this is that there are special characters that you cannot use directly in a string. In this case, your path is the chain. Backslash is be one of the special characters that you cannot use directly in a string. To work around this problem, you must do what is called an escape sequence. In this case, the escape sequence for------is------.

• Check if the file exists returns the value false. File is located in system32

  I'm having a problem to detect if there is a file that has been simply copied to the system32 directory.  I tried to move the file to various other directories and simply using a vi with action "check if a file or folder exists.  I narrowed down it to not be able to find the file if I copy into c:\windows or c:\windows\system32.

  I thought it could be a permissions problem, but not my best to assign the user full name control folders.

  Another interesting thing is that if I do file an input control and click on the "folder" icon to open a list of files, I see either the files newly copied to the system32 directory.  Very strange.

  It is on a PC, Dell, Windows 7 Professional/Labview 2010 SP1 (note that I use the vi. as an executable on this machine).  Would it be a setting in the generation of my project?

  If you are using Windows 7 64 bit, it may be related to problems that the user has been seen here:

  http://forums.NI.com/T5/LabVIEW/problem-using-quot-MSG-quot-command-with-quot-system-exec-VI/m-p/153...

  It may be that LabVIEW functions are 32-bit and are diverted.

• How to check if a file exists on target RT

  Hello

  I wonder y at - there a way to check if there is a file on target RT? Thank you!

  Tom

  You mean from the host? You can use the FTP functions. "FTP Get path Info.vi" returns error code 550 if a file is not but a code of success if he finds. You can also check the output of "path info". The type will tell you unknown if there isn't but the file if it is there.

• the fastest way to load an XML file

  What is the fastest way to generate an xsd-based oracle table and then load data from a file that conforms to the xml document in the xsd.

  I would do something like this:

  SQL > insert into tmp_xml

  2 values)

  3 xmltype (bfilename('TEST_DIR','test.xml'), nls_charset_id ('AL32UTF8'))

  4  );

  1 row inserted

  SQL >

  SQL > select x1.col_a, x1.col_b, x1.col_c, x2.*

  tmp_xml 2 t

  3, xmltable)

  4 "/ parent/Child1.

  5 passage t.object_value

  path of 6 columns col_a varchar2 (10) '@ColumnA '.

  7 road of varchar2 (10) col_b '@ColumnB '.

  8 road of varchar2 (10) col_c '@ColumnC '.

  9, child2 xmltype path "Child2".

  (10) x 1

  11, xmltable)

  12 ' / Child2'

  13 passage x1.child2

  path of 14 columns col_d varchar2 (10) 'ColonneD '.

  15 road of varchar2 (10) col_e "child3/column.

  16, road of varchar2 (10) col_f "child3/ColumnF.

  17 road of varchar2 (10) col_g "child3/column".

  18 road of varchar2 (10) col_h "child3/ColumnH.

  19 road to varchar2 (10) col_i 'ColumnI.

  (20) x 2

  21;

  COL_A, COL_B, COL_C COL_D COL_E COL_F COL_G COL_H COL_I

  ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------

  CAF ClientID ClientName 20130121 D 20752,19 AUD

  FCA ClientID ClientName M 20130121 235.39 bla Blahdeblah AUD

  (you can adjust data types as needed)

• Check if a file exists in the network dir (JS)

  I found an old post that made me to:

  If {(myFile.exists)

  Alert ("File Exists");

  }

  on the other

  Alert ("file does not exist");

  The problem is that when I use the macname/volumes/dir/folder/folder/file.indd path (which was created from variables) that myFile script is not conclude to the existence of a file that I know. All I get is the alert "file does not exist.

  I set myFile as being a string?

  I'm still fumbling my way around JS and conversion Applescripts for JS to work cross-platform. Thanks in advance...

  I set myFile as being a string?

  No, set it as follows:

  var myFile = new File("/Volumes/VolumeName/FolderName/SubFolderName/FileName.indd");

• SQL statement to check if a file exists

  Good afternoon
  
  I thought I saw once a post that had a SQL statement that would check a table to check if a record exists and return true or false... He would return all records, just a Boolean... Such a function exists? I searched the forums, but I don't remember what I was ready when I found this...
  
  Thanks in advance for any help you can offer.
  
  Donald

  Hi Donald,.

  Oracle SQL is not a Boolean data type (see: http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/sql_elements001.htm#sthref19 for types available).

  As a general rule, a custom function returns 0 or 1 or 'Y' or ' no 'TRUE' or 'FALSE' or something similar, like a number or a varchar2.

  Depending on what you need to do and where you need to do, there are other options available. For example, a validation of the page, you could do a validation EXISTS of:

  SELECT 1 FROM TableX WHERE Field1 = value
  

  This would amount to true or false and validation would be success or failure as a result.

  Within a process, you would do something like:

  DECLARE
   vCOUNT NUMBER;
  BEGIN
   SELECT COUNT(*) INTO vCOUNT FROM TableX WHERE Field1 = value;
   IF vCOUNT > 0 THEN
    do something if there is a record;
   ELSE
    do something if there isn't a record;
   END IF;
  END;
  

  Andy

• How to run a job that will check if the files exist?

  I have a file in real time ' ' which has about 15 files (test1.txt, other.txt etc.) txt, theres is other jobs that nothing related to coldfusion that if something fails then the file no longer exists.

  So I want to create a job if there is no such thing as a txt file so he sent me an email.

  What would be the best way to do something like that?

  I have to check for every individual txt, something like file?

  <cfset Pathtest = "\\folder1\dept\Alerts\other.txt">
  
  <cfif !fileExists(Pathtest)>
    <cfmail ...>
    sent me a email
    </cfmail>
      
  </cfif>
  

  If all the files are in the same directory, you can create a list separated by commas (or even a table) file names, and that loop.

  
  
  
      
          ... email me ...
      
  
  

  HTH,

  ^_^

• Check if a file exists

  Hey all. I designed an outlet quick and dirty to flash converter. One thing I want to do is to be able to say how many slides in advance there, without even knowing the folder the user input slides are, so I can dynamically create a clue any. I know there are ways to do it simply passing by and attempt to load the blades until I have to find one that does not, but it's too inefficient when there are a lot of slides.
  
  I guess I'm looking for help to come up with other methods if they exist. Thanks in advance.

  In case anyone has this need in the future, I was able to come back with a bit of best solution I noticed was also mentioned some in the forums but I didn't until just at the time. In any case, I just basically tried to load movies and checked the total bytes. There are bytes, there's a file. With this method, I was able to spend a lot more files in a short period of time.

• How to check if a file exists?

  Hi guys.

  I am running javascript in Acrobat .pdf file created in LiveCycle Designer.

  I need to check in silence if an external file outside the open document (C:\something\something\something.pdf) exists or not.

  I understand that I'm only able to do this as a function of confidence within a script to the folder level javascript.  I am familiar with those.   The problem is, I don't know what function I should use and will have a difficult time in the research on it.

  Try to use: doc.exists?

  Try to open the document with a function and catch the error if the file does not exist?

  I'm not so sure that if I just spend my path as a string, say "/ C/Something/something/something.pdf" or if I should first deal with the file as an object like:

  var myFile = new File("/C/Something/something/something.pdf") (which was not in Acrobat... don't try to run it as a function of confidence)

  Please notify.

  Thank you!

  I finished this figure myself.

  XFA/JavaScript in my paper, I call a custom function that I have written and pass a string (or a string variable containing) my file path for that I would like to check:

  if(typeof(MJS_FileExists) == "function") {
      try {
          if(MJS_FileExists("/C/something/somethingelse/filetocheckfor.pdf") == true) {
              xfa.host.messageBox("file is there");
          } else {
              xfa.host.messageBox("file is NOT there");
          }
      }
      catch(e) {
          app.alert("Processing error: "+e)
      }
  }
  

  The function I call is a folder level javascript.   You have to maybe do some Googleing on how and where to install them.   In the my file .js file real javascript level where the function is housed I use:

  var MJS_FileExists = app.trustedFunction(function(filename) {
      app.beginPriv();
      var existingDoc = false;
      try {
           var checkDoc = app.openDoc(filename);
           checkDoc.closeDoc();
       existingDoc = true;
      } catch(e) {
       existingDoc = false;
      }
      return existingDoc;
      app.endPriv();
  });
  

  It took me a lot of trial and error.  It sucks there is not a lot of in on the internet on how to do it via Acrobat / Live Cycle.   Hope this helps someone else.

• Check if a path of the file exists

  I need to check if a file exists. He started to do this by searching for the first file expected in a sequence and that worked, but only when the artists returned correctly. To find this file, I was reading in what was expected and if it has returned true, pass the path of the next folder. Basically, I'm trying to go through the numbered files and find the most recent version, IE version_01

  Probably something like this:

  var myFolderPath = / / your folder path

  var myFolder = new Folder (myFolderPath);

  If {(myFolder.exists)

  do things

  } else {}

  do other things

  }

  Dan

• What is the best way to check if the trigger was held

  What is the fastest way to check if the trigger was held. Right now, the only way I can think is to query the number of samples acquired on the AI channel (which is triggered). Is there a faster way? Is there a property node (that I can't find) that returns TRUE/FALSE?

  Thank you

  Can you elaborate a bit more? What type of trip (I guess a start trigger)? What equipment? What do you mean by 'faster '?

  There is no property to "has a start trigger has occurred." If you want to find if a start trigger has occurred, you can he deduct the number of samples. There are several approaches you can take:

  * DAQmx Read will hang until a timeout is hit or up to the number of samples you request is read. You could do a DAQmx Read with a timeout-infinity (1), playback of a single sample.

  * Well, you could ask about properties DAQmx Read TotalSampPerChanAcquired or AvailSampPerChan; Once they no longer means 0, while this NEITHER-DAQmx started buffering data internally, which means that the material received the trigger.

  * If you use a digital border start trigger and according to your material, then you may be able to use the detection of changes in a separate task, but I don't know if it would be significantly faster then the other two approaches.

• How to check if a folder exists

  Hello
  
  I have a custom filter component:

  public class BarcodeMetadataFilter implements FilterImplementor{
  }

  I check here if the file exists in xCollectionId value, so I have two qustions:
  
  (1) should what service I call to check if the file exists?
  (2) how to call this service from the filter?
  
  Kuba

  Call a service such as COLLECTION_GET_INFO. Pass the parameter dCollectionID which must be xCollectionID. If you receive and error, it may mean that the folder does not exist. You should check the error (exception) to ensure what he wants to say to you is that the folder does not exist.

  http://docs.Oracle.com/CD/E23943_01/doc.1111/e11011/c07_folders.htm#i1082467

  The following blog post will show you how to run a service, a filter: http://jonathanhult.com/blog/2012/06/execute-a-service-from-a-java-filter/

  Jonathan
  http://jonathanhult.com