FAULT: COM Automation with long strings

Does anyone know if you can use COM Automation to call COM objects that return string longer than 255.
We have a problem in that when we call a method that returns a string longer than 255 chars it truncates it. The documentation says that you pass in a Varchar2.
I have tested the COM object from VB and it does not truncate it.

Hello eugene2,
I get the same problem.
Did you get a solution ?
Thanks in advance
Gamiet

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Parameter with Long String

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Domain Name : BSSL
Database Name : SATS
SID : SATS
TNSNames.ORA
===========
# D:\ORACLE\ORA81\NETWORK\ADMIN\TNSNAMES.ORA Configuration File:D:\Oracle\Ora81\network\admin\tnsnames.ora
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Config.ORA
==========
# D:\ORACLE\ORA81\NETWORK\ADMIN\LISTENER.ORA Configuration File:D:\Oracle\Ora81\network\admin\listener.ora
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(ORACLE_HOME = D:\Oracle\Ora81)
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After Installing Oracle, If we get this error, is the only solution Re-installing Oracle? Often this is troubling with this error? Can we rely on this option and continue to use Oracle COM Automation feature in our Application?
Please suggest.
My mail id:
[email protected]
[email protected]
null

can we use this COM Automation with Oracle 9i Application server
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When I forward an e-mail, I get a long string of gobblygook that goes with it and I cannot figure out how to eliminate it without having to delete it every time

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PL/SQL COMWRAP.SQL COM Automation in Windows

Hello All,
Mike here. I'm not sure which forum this should go in so I put it here.
I'm writing a pl/sql procedure that calls ordcom (create by comwrap.sql) which uses orawpcom11.dll to work with com automation objects on windows. It appears that there is a limit on the amount of data that can be passed back to Oracle (approx. 34kb stored as a file). My best guess is that comwrap.sql doesn't provide for returned text steams that are larger than that provided by varchar2 in pl/sql. I tried adding to the comwrap.sql to have clob as a return type but that does not work.
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Thanks,
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The actual size is 32767 bytes Mike. And I'm not sure what happened to the last byte to make it 32768 and exactly 32KB. ;-)
You cannot change a varchar2 data type for a clob data type. These two types are quite different when it comes to memory allocation and management of variables of that type. These methods are incompatible. Essentially a clob variable is a "locator variable" (aka lob locator). Just another word for a pointer.
Declaring a clob variable is simply defining a pointer variable that, as yet, points to nothing. The clob needs to be created, memory allocated, and the point/locator must be set to this chunk of clob memory allocated.
Declaring a varchar2 variable results in the compiler doing the actual work at compilation time - reserving space for that variable and setting that variable's address to this preallocated space.
In terms of client-server, this a tad more complex. The data sits in the client. The data must be passed to the server. So there is a client variable. There is a server variable. And the content of one needs to be copied/pushed/transferred somehow from client variable to server variable.
Windows supports a set of data types. Oracle supports a different set. Why? Despite Oracle on Windows, Oracle also runs on something like a 100 other operating systems too. There are endian issues. CPUs dealing differently with reals and floats and integers. Oracle has thus its own abstraction layer and implement is own consistent set of data types - across all platforms.
So when pushing data from a client variable (like a COM object var) into a server variable (like a CLOB), it is not as simple as "copy-and-paste".
PL/SQL "understand" basic Windows data types like zero terminated strings - which it can accept into varchar2 variables. But as PL/SQL has a 32KB (less one byte) varchar2 limit, it cannot accept a huge Windows string (or data stream). And getting that to work via a clob, very likeky requires changes in the interface between client and server that does this transfer of data.
It requires more than just changing the server variable's data type from varchar2 into a clob, unfortunately. You will need to read up on Oracle's EXTPROC interface (I expect this is what is being used to interface with COM objects?) to see how to deal with LOB data types in this respect.

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Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left. If you don't see that menu, select
View ▹ Show Log List
from the menu bar.
Enter the name of the crashed application or process in the Filter text field. Select the messages from the time of the last crash, if any. Copy them to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.
When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.
Please do not indiscriminately dump thousands of lines from the log into this discussion.
Important: Some private information, such as your name, may appear in the log. Anonymize before posting.
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Problem with Long and BigDecimal DataType convertion

HI,
I have an application which talk to MySQL database with Spring JDBC layer and everything runs like a champ :)
Now I am converting the same application with the same DAO implementation to communicate with oracle database and I am having some trouble converting DataType from database to my java code.
For example before with MySQL I would convert any Integer coming from the database to Long datatype and it worked. Now it seems that Int datatype from oracle comes as a BigDecimal type.
I am thinking about two approaches writing an additional implementation to implement my dao interfaces or if there is some trickery that I can bypass doing that and work around these datatype incompatibility from MYSQL to Oracle.
I can also put bunch of try and catch statements and if fails with Long try with BigDecimal, but still don't buy it as the best solution.
Here use also code snippet:
User u = new User();
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Edited by: kminev on Mar 3, 2010 12:25 PM

//This is my entity class
public class User implements Comparable<User> {
    private Long objectId = 0L;
    private Company company;
    private String logon = "";
    private String password = "";
    private String name = "";
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<bean id="userDAO" class=" com.myorg.myapp.dao.jdbc.UserImpl">
        <property name="transactionManager">
            <ref local="transactionManager"/>
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        <property name="companyAccessDAO">
            <ref local="companyAccessDAO"/>
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When using the Database Connectivity Toolset, reads and writes with long binary fields are incompatible.

I am trying to write LabVIEW Variants to long binary fields in a .mdb file using the Database Connectivity Toolset. I get errors when trying to convert the field back to a variant after reading it back from the database.
I next tried flattening the variant before writing it and ultimately wound up doing the following experiments:
1) If I use DB Tools Insert Data to write an ordinary string and read it back using a DB Tools Select Data, the string is converted from ASCII to Unicode.
2) If I use DB Tools Create Parameterized Query to do an INSERT INTO or an UPDATE operation, specifying that the data is BINARY, then read it back using a DB Tools Select Data,
the length of the string is prepended to the string itself as a big-endian four-byte integer.
I can't think of any way to do a parameterized read, although the mechanism exists to return data via parameters.
Presuming that this same problem affects Variants when they are written to the database and read back, I could see why I get an error. At least with flattened strings I have the option of discarding the length bytes from the beginning of the string.
Am I missing something here?

David,
You've missed the point. When a data item is flattened to a string, the first four bytes of the string are expected to be the total length of the string in big-endian binary format. What is happening here is that preceding this four-byte length code is another copy of the same four bytes. If an ordinary string, "abcdefg" is used in place of the flattened data item, it will come back as <00><00><00><07>abcdefg. Here I've used to represent a byte in hexadecimal notation. This problem has nothing to do with flattening and unflattening data items. It has only to do with the data channel consisting of writing to and reading from the database.
I am attaching three files that you can use to demonstrate the problem. The VI file c
ontains an explanation of the problem and instructions for installing and operating the demonstration.
Ron Martin
Attachments:
TestLongBinaryFields.vi ‏132 KB
Sample.UDL ‏1 KB
Sample.mdb ‏120 KB

Strange behavior when emptying long strings

The attached vi is supposed to clear a string indicator after its length becomes greater than a specified threshold length, with led indicators following the process. It works fine at threshold 262268, but increasing it to 262269 causes it to periodically freeze. The indicator lights do not update appropriately either. Also if you set the threshold much higher, like around 1,000,000, the temporary freeze becomes even longer. Is there a way to fix this?
Message Edited by AntLee29 on 05-16-2007 06:14 AM
Message Edited by AntLee29 on 05-16-2007 06:16 AM
Attachments:
string clearing.vi ‏15 KB
string clearing.PNG ‏20 KB

Hi AntLee,
this is NOT a problem of memory handling - you are playing with 256kB of memory, pretty easy for modern computers.
The problem comes from your LineFeed constant together with the string indicator!
If you replace the LF by a Tab constant your example runs fine even with a treshhold of 1000000 (one million).
So I suspect the string indicator has problems to show more than 262286 (~2^18) lines of text because of rendering all those line breaks - maybe NI should investigate this more deeply...
Message Edited by GerdW on 05-16-2007 04:38 PM
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome
Attachments:
string clearing.vi ‏15 KB

FAULT: COM Automation with long strings

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