Calling Window's Dll Functions from Java

Hello Audience,
Is there a way to call Win32/64 based Dynamic-Link-Library functions from Java?
Thanks,
GenKabuki

Yes.
In general, if you are trying to call functions in an existing dll, you will have to write a "wrapper" dll that meets the java jni interface requires. There are tools around wich purport to generate these for you. Do a google serach; among other tools, you should turn up JACE.

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HI!
What's the best way (and simple) to call DLL function from JAVA.
DLL function (developed in C) has two input parameters (string) and return an integer.
Could you help with an example?
Thanks a lot.

Do a google search for 'JNI tutorial' and it will turn up hundreds of examples.

Calling a PL/SQL function from java

I would like to call a pl/sql function from java. My pl/sql function is taking arrays of records as parameters. How do i proceed? Which specific oracle packages do I have to import?
Please send an example.
TIA,
Darko Guberina

Documentation here: http://download-uk.oracle.com/docs/cd/B14117_01/java.101/b10983/datamap.htm#sthref185
says JPublisher can publish records too.
But when I change the example given at http://download-uk.oracle.com/docs/cd/B14117_01/java.101/b10983/datamap.htm#sthref190 as following:
PACKAGE "COMPANY" AS
type emp_rec is record (empno number, ename varchar2(10));
type emp_list is varray(5) of emp_rec;
type factory is record (
name varchar(10),
emps emp_list
function get_factory(p_name varchar) return factory;
END;
then I see <unknown type or type not found> at sql or java files generated. Any ideas?

Calling a SP or Function from Java receiving a geometry(MDSYS.SDO_GEOMETRY)

Hi there,
What I want to do is: calling a stored procedure OR function from Java with a String-variable as input and receiving a geometry (SDO_GEOMETRY).
I’m facing currently the problem of calling a stored function on oracle 11g from Java using JPA (EclipseLink), Spring 2.5.6 returning an MDSYS.SDO_GEOMETRY object.
I’ve tried to call a stored procedure with MDSYS.SDO_GEOMETRY as an output parameter instead, but with no success.
The function’s signature looks like this:
CREATE or REPLACE
FUNCTION GET_GEO_BRD_FUNCTION(p_geo_brd_id IN VARCHAR2) RETURN MDSYS.SDO_GEOMETRY AS
sdo_geom    MDSYS.SDO_GEOMETRY := null;
BEGIN
/* do some fancy stuff on the database side */
SELECT sp_geom
    INTO sdo_geom
    FROM geo_brd WHERE id = p_geo_brd_id;
RETURN sdo_geom;
END;
The calling code looks like this:
MyClass extends JpaDaoSupport{
   /** logger */
   protected static final ILogger LOG = LogFactory.getLogger(MyClass.class);
    * {@inheritDoc}
    * @see com.example.MyClass#calculateGeometry(java.lang.String)
   @Override
   public JGeometry calculateGeometry(final String id) {
       JGeometry geometry = null;
       final JpaCallback action = new JpaCallback() {
            @Override
            public Object doInJpa(final EntityManager em) throws PersistenceException {
               final Session session = JpaHelper.getEntityManager(em).getActiveSession();
               final StoredFunctionCall functionCall = new StoredFunctionCall();
               functionCall.setProcedureName("GET_GEO_BRD_FUNCTION");
               functionCall.addNamedArgument("p_geo_brd_id");
               functionCall.setResult("sdo_geom", Oracle.sql.STRUCT.class);
               final ValueReadQuery query = new ValueReadQuery();
               query.setCall(functionCall);
               query.addArgument("p_geo_brd_id");
               final ArrayList args = new ArrayList();
               args.add("2e531e62-2105-4522-978a-ab8baf19e273");// hardcoded for test
               final Object result = session.executeQuery(query, args);
               return result;
    final STRUCT result = (STRUCT) this.getJpaTemplate().execute(action);
    try {
       geometry = JGeometry.load(result);
    } catch (final SQLException e) {
       MyClass.LOG.error("Error loading JGeometry from STRUCT.", e);
       return null;
    return geometry;
And when I execute the query I get the following error:
Internal Exception: java.sql.SQLException: ORA-06550: Row 1, Column 13:
PLS-00382: expression is of wrong type
ORA-06550: Row 1, Column 7:
PL/SQL: Statement ignored
Error Code: 6550
Call: BEGIN ? := GET_GEO_BRD_FUNCTION(p_geo_brd_id=>?); END;
     bind => [=> sdo_geom, 2e531e62-2105-4522-978a-ab8baf19e273]
Query: ValueReadQuery()
So I thought may be let's try it with a stored procedure instead...
The procedure looks like this:
CREATE or REPLACE
PROCEDURE GET_GEO_BRD_PROCEDURE(p_geo_brd_id IN VARCHAR2, sdo_geom OUT MDSYS.SDO_GEOMETRY) AS
BEGIN
/* do some fancy stuff on the database side */
SELECT sp_geom
    INTO sdo_geom
    from geo_brd where id = p_geo_brd_id;
END;
The calling Java code in case of the stored procedure looks like this (only the content of the JPACallback has changed):
@Override
public Object doInJpa(final EntityManager em) throws PersistenceException {
    final Session session = JpaHelper.getEntityManager(em).getActiveSession();
    final StoredProcedureCall spCall = new StoredProcedureCall();
    spCall.setProcedureName("GET_GEO_BRD_PROCEDURE");
    spCall.addNamedArgument("p_geo_brd_id", "p_geo_brd_id", String.class);
    spCall.addNamedOutputArgument("sdo_geom", "sdo_geom", OracleTypes.STRUCT);
    final ValueReadQuery query = new ValueReadQuery();
    query.setCall(spCall);
    query.addArgument("p_geo_brd_id"); // input
    final List args = new ArrayList();
    args.add("2e531e62-2105-4522-978a-ab8baf19e273");// hardcoded for test
    final Object result = session.executeQuery(query, args);
    return result;
And when I execute the query I get the following error:
java.sql.SQLException: ORA-06550: Row 1, Column 13:
PLS-00306: wrong number or types of arguments in call to 'GET_GEO_BRD_PROCEDURE'
ORA-06550: Row 1, Column 7:
PL/SQL: Statement ignored
So both exceptions look quite similar.
I guess in both cases the exception description leads to the assumption, that the wrong type for the return value / output parameter is used…
So - how can a receive a MDSYS_SDO_GEOMETRY object from a stored procedure or stored function in Java ?
What is wrong in the Java code?
Thank you in advance for any suggestions!
Yours,
Chris
Edited by: user3938161 on 20.12.2011 07:46
Edited by: user3938161 on Dec 20, 2011 8:06 AM: added variable declaration of JGeometry geometry in source code

Thanks, that did the trick! ;-)
Here is now the code for stored procedure and function for anybody else encountering the same troubles... (be aware of the parameter order and/or naming!)
Code for stored functions:
final JpaCallback action = new JpaCallback() {
@Override
public Object doInJpa(final EntityManager em) throws PersistenceException {
     final Session session = JpaHelper.getEntityManager(em).getActiveSession();
       * Using CallableStatement for stored functions
      STRUCT st = null;
      CallableStatement cs = null;
      final DatabaseLogin login = session.getLogin();
      final Connection _conn = (Connection) login.connectToDatasource(session.getDatasourceLogin().buildAccessor(), session);
      try {
         try {
            cs = _conn.prepareCall("{? = call GET_GEO_BRD_FUNCTION(?)}");
            cs.registerOutParameter(1, OracleTypes.STRUCT, "MDSYS.SDO_GEOMETRY");
            cs.setString(2, "2e531e62-2105-4522-978a-ab8baf19e273");//TODO: hardcoded for test
            cs.execute();
         } catch (final SQLException e) {
            MyClass.LOG.error("An exception occured calling the stored procedure", e);
         if (cs != null) {
            //reading geometry from the database
            try {
               st = (STRUCT) cs.getObject(1);
            } catch (final SQLException e) {
               MyClass.LOG.error("An exception occured converting the query result to oracle.sql.STRUCT", e);
      } finally {
         try {
            if (_conn != null && !_conn.isClosed()) {
                _conn.close();
         } catch (final SQLException e) {
            MyClass.LOG.error("An exception occured on closing the database connection.", e);
      return st;
final STRUCT result = (STRUCT) this.getJpaTemplate().execute(action);
The code for stored procedure solution:
final JpaCallback action = new JpaCallback() {
@Override
public Object doInJpa(final EntityManager em) throws PersistenceException {
      final Session session = JpaHelper.getEntityManager(em).getActiveSession();
       * Using CallableStatement for stored procedure
      STRUCT st = null;
      CallableStatement cs = null;
      final DatabaseLogin login = session.getLogin();
      final Connection _conn = (Connection) login.connectToDatasource(session.getDatasourceLogin().buildAccessor(), session);
      try {
         try {
            cs = _conn.prepareCall("{call GET_GEO_BRD_PROCEDURE(?,?)}");
            cs.setString("p_geo_brd_id", "2e531e62-2105-4522-978a-ab8baf19e273");
            cs.registerOutParameter("sdo_geom", OracleTypes.STRUCT, "MDSYS.SDO_GEOMETRY");
            cs.execute();
          } catch (final SQLException e) {
            MyClass.LOG.error("An exception occured calling the stored procedure", e);
          if (cs != null) {
            //reading geometry from the database
            try {
               st = (STRUCT) cs.getObject("sdo_geom");
            } catch (final SQLException e) {
               MyClass.LOG.error("An exception occured converting the query result to oracle.sql.STRUCT", e);
       } finally {
          try {
            if (_conn != null && !_conn.isClosed()) {
               _conn.close();
          } catch (final SQLException e) {
            MyClass.LOG.error("An exception occured on closing the database connection.", e);
        return st;
final STRUCT result = (STRUCT) this.getJpaTemplate().execute(action);

LabVIEW call Win32 API DLL function from third party

Hi everyone,
I'm trying to build a LabVIEW 2010 interface on 32-bit Window XP system to configurate and communicate to an Anglient laser head through its USB expansion box. I contacted the vendor and they shared a win32 API with some dll files. I started with a function called "A55292Find", but the CLF node always pop up error 1097.I checked the MSDN to get the corresponding LabVIEW data type for CLF.
My question is: Do I need to initialize those arguments? (How can I know the values of them if initialization is needed?)
Could anyone help me figure out what's the problem?
Here is what I have from API documents about this function:
The A55292Find function returns lists of handles and board types for all the 55292 USB
Expansion Modules connected to the system.
A55292RC __cdecl A55292Find(
HANDLE hBoxes[], // List of handles for the boxes found. (as Unsigned 32-bit integer numeric)
BOARDTYPE PortABrdType[], // List of board types for slot A boards (as Unsigned 16-bit integer numeric)
BOARDTYPE PortBBrdType[], // List of board types for slot B boards (as Unsigned 16-bit integer numeric)
WORD *spMaxBoxes); // dimension for all of the passed arrays. (as Unsigned 16-bit integer array data pointer)
// (function return type as Unsigned 32-bit integer numeric)
Parameters
HBoxes[] Array that will receive the list of HANDLES for all the 55292 boxes connected.
PortABrdType[] An array that will receive Slot ‘A’ board type information for each 55292 box.
PortBBrdType[] An array that will receive Slot ‘B’ board type information for each 55292 box.
spMxBoxes Passes the maximum number of values that can be held in hBoxes, PortABrdType, and PortBBoardType arrays to the A55292Find routine and returns the actual number of boxes found
The return value will be one of the following A55292RC return codes:
Value Meaning
A55292_NO_ERROR No error
A55292_TIMEOUT Timeout accessing a shared memory
Remarks
This routine must be called to obtain handles and board type information used in calling all the other routines. If there are significantly more array elements than boxes, the routine will take longer to complete.
These are the definitions:
typedef DWORD A55292RC; enum{A55292_NO_ERROR, A55292_HANDLE_ERROR,...}
typeder WORD BOARDTYPE; enum{A55292_PCAL_BOARD, A55292_NO_BOARD, ...}
Thanks a lot,
Kang
Solved!
Go to Solution.
Attachments:
call A55292Find.vi ‏10 KB

nkang11 wrote:
Hi Mr. Kalbermatter,
As you told me, I should try to use the defined enumeration words as control and indicator.
For the previous CLF node, it successfully returned the hardware configuration (I have only connected a board at slot A):
But I really want to see a string return as "A55292_PCAL_BOARD" which is defined by "typedef WORD BOARDTYPE; enumeration {...}; Does that mean I need to change the data type or do something like "converter"? Or initialize the array first, then convert it to string type?
Right now, I'm trying to open the laser card by using "A55292PcalOpen(HANDLE hDev, SLOTSELECT SlotSelector);" function which requires to use the enumeration constants from " typedef WORD SLOTSELECT; enum {A55292_PORT_A, A55292_PORT_B};" but I'm confused to shot an constant control to a new CLF node.
Since almost all of the arguments in dll function are typedefined as WORD, short and struct et al, I hope you could give me some hints on it.
Thank you very much sincerely!
Kang
Depending on the actual C implementation you can simply create a LabVIEW enum with the according item names or use a ring control instead. Teh enum requires the numeric values of the items to be in consecutive order without any gaps in between. This is a given if the C definition never assigns a specific number to the item. If the C enum is not consecutive you need to go with a ring control instead.
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions

CALLING a STORED SQL FUNCTION from Java 1.1.8

I am trying to execute a stored function in JAVA 1.1.8, from an Oracle
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How to call windows help files .hlp from Java program

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How to call windows Help file that is xxx.hlp files from java programs
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regards
veeru

How about
Runtime.getRuntime().exec("start xxx.hlp");

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I don't know anything about it but it looks like EZ JCom in conjunction with the included Remote Access Service does what you're after. It's not free though.
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Is it possible to call OCI's API functions from Java and create a Lightweight Session ?
Please help me out.

I too would like to know how this can be accomplished. I have
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Hi Guys ,
The tutorial in this site talks about creating ur own DLL's and then calling them from Java . I need to call C functions in existing DLL's from Java . How do I go about doing this ? . Any help on this would be much appreciated.
regards
murali

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Then you'll have one C library that you compile and a set of Java classes and you can load arbitrary functions out of arbitrary dynamic libraries. In my case you don't even have to know what the libraries and functions are ahead of time, the user can set that up in a config file.
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Error PLS-00306 during calling PL/SQL function from Java

Hi all,
I am facing a problem during call of oracle PL/SQL function from java using CallableStatement.
I receive following error message.
java.sql.SQLException: ORA-06550: line 1, column 13:
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cStatement.execute();
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Actually above function requires three input parameters and one return parameter.
During execution of above java code it throws SQLException and shows PLS-00306: wrong number or types of arguments in call to 'EXPORT_HIST_ALARMS_FUNC' error.
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But I am unable to figure out why it doesn't run from above java code.
Please help regarding this.
Thanks.
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Try this:
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CallableStatement cStatement = null;
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cStatement.setString(2,endDateTime);
cStatement.setString(3,meType);
cStatement.execute();
msg = cStatement.getString(1);Regards,
Martijn Teigeler
Edited by: mTeigeler on Oct 13, 2007 10:22 AM

ORA-00911: invalid character - Calling a function from Java..

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This is my Java code:
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strSql.append("SELECT GET_TBL('II_2_1_6_5') AS TABLA FROM DUAL;");
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According to this link we need to write the native method implementation in such a way that the method signature should exactly match the method signature created in the header file.
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Please suggest me appropriate solution for this. Please let me know whether it can be done using JNI or is there any other method for this.
thanks

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--Marc (http://jnative.sf.net)

Calling Window's Dll Functions from Java

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