Object array type casting?

Hi. I still can't get the hang of array type casting. Is it possible to type caste an array of objects? I tried the following
LabelledPanel[] comp = (LabelledPanel[])(content.getComponents());
in my program and I got the ClassCastException.
Exception occurred during event dispatching:
java.lang.ClassCastException: [Ljava.awt.Component;
LabelledPanel is a descendent of JPanel and getComponents() supposed to return Component[]

java does support casting with arrays. The following code will work:
String [] strings = new String[] { "1", "2" };
Comparable [] comps = (Comparable[])strings;
Object [] objects = (Object [])strings;That is, you can cast following the normal rules of assignment. You are having problems because your casting violates the normal rules of assignment- you're trying to cast a type into a differnt type that it does not extend or implement.
the toArray() in the Collections API really has nothing to do with casting. That method converts the current Collection into an array of the same type. Since all arrays extend java.lang.Object, it returns the new array as an Object, which you then cast into the specific type.
You may want to read the language guidlines on casting if you are having problems with it:
http://java.sun.com/docs/books/jls/second_edition/html/jIX.fm.html
you can also look at the documenation for Class.isAssignableFrom , which explains casting more briefly.

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Insertion in Table having Column of object array type

Hi!
I want to make an object type and then the VARRAY of the that object type and then make table having column of VARRAY type.
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I will be thankful.
regards
Imran

See following discussion http://asktom.oracle.com/pls/ask/f?p=4950:8:11071256505039606339::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:1583117527730
and let's thank again Tom !

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Type casting for properties accessed in COM Object

I have a com object that I need to access which provides my a
list of addresses in an Array. The object give me a property that
has a count for the number of addresses and then I have a loop that
calls the property which contains the address details to get each
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This errors out each time.
The error I get is
Error casting an object of type to an incompatible type.
This usually indicates a programming error in Java, although it
could also mean you have tried to use a foreign object in a
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It appears the the variable type of the index is not
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IS there some way to type cast the variable used as the index
for CFLOOP to that of an INT?

You can try to use the JavaCast("int", myValue) function. It
works great for Java objects, but I'm not sure how well it will
work for COM. Worth a try, I guess.
In your case it would be something like:
<cfobject type="COM" context="INPROC" action="create"
name="MR" class="DLLNAME">
<cfloop from="1" to="#AddressCount#" index="i">
<cfset VDname = mr.vdsname(JavaCast("int", i))>
<cfset VDaddress = mr.vdsaddress(JavaCast("int", i))#>
<cfset VDXML = mr.VDSXML(JavaCast("int", i))>
</cfloop>

Type casting arrays

i m reading an array of int from ObjectOutPutStream. can any body tell how do we type cast an object to array ??

karansha:
I'm sure you mean you're trying to read in an int[] from an ObjectInputStream that was written to an ObjectOutputStream since you can't read from an OutputStream. Use something like this:
ObjectInputStream in = <whatever>;
int[] intArray = (int[])in.readObject();adramolek:
Why should you use an Integer[] instead of an int[] for serialization? All arrays of primitives -- boolean[], byte[], double[], float[], int[], long[], short[] -- are serializable as is; there is no need to convert them to arrays of their wrapper types simply to serialize them.
In fact, the output from the following piece of code shows exactly which interfaces are implements by an int[]:
Class cls = int[].class;
Class[] interfaces = cls.getInterfaces();
for (int i = 0; i < interfaces.length; i++) {
System.out.println(interfaces.getName());
The output is:
java.lang.Cloneable
java.io.SerializableThe output is identical for each of boolean[], byte[], double[], float[], int[], long[], and short[], showing that each type is both serializable [i]and cloneable.
Shaun

How to overcome: System.InvalidCastException: Unable to cast object of type

Hi,
For the database connectivity, we use ODP.Net. In one of the functionality we are trying to bind an array to stored procedures and have it execute for the each iteration of the array as a bulk transaction.
Not always but, 10% of the times the function has raised the following exception
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Has anyone ever faced such a problem, if someone has a soltuion it would be of great help to me.
Thanks

Hi,
For the database connectivity, we use ODP.Net. In one of the functionality we are trying to bind an array to stored procedures and have it execute for the each iteration of the array as a bulk transaction.
Not always but, 10% of the times the function has raised the following exception
System.InvalidCastException: Unable to cast object of type 'System.DateTime[]' to type 'System.IConvertible' .
Has anyone ever faced such a problem, if someone has a soltuion it would be of great help to me.
Thanks

Is there a way to type cast an array of strings to numbers and back again?

I'm working on an application where I want to type cast a string like "power supply" into an array of existing numbers. Then sort the existing numbers, and finally convert the casted numbers back into a string so it can be read by the user. In the attachment, you can see my latest attempt with flatten/unflatten data and the 'convert string to byte array'. I can't seem to make this work. Any ideas?
Thanks - Paul
Attachments:
Paul's Temp scan for components.vi ‏56 KB

OK, here's a quickie (LabVIEW 7.0).
Simply get the sort key from the 1D array, then build the table.
Message Edited by altenbach on 10-27-2006 01:34 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
SortedTable.png ‏4 KB
SortedTable.vi ‏37 KB

Splitting and type casting huge string into arrays

Hello,
I'm developing an application which is supposed to read measurement files. Files contain I16 and SGL data which is type casted into string. I16 data is data from analog input and SGL is from CAN-bus data in channel form. CAN and analog data is recorded using same scan rate.
For example, if we have 6 analog channels and 2 CAN channels string will be (A represents analog and C represents CAN):
A1 A2 A3 A4 A5 A6 C1 C2 A1 A2 A3 A4 A5 A6 C1 C2 A1 A2 .... and so on
Anyway, I have problems reading this data fast enough into arrays. Most obvious solution to me was to use shift registers and split string in for loop. I created a for loop with two inner for loops. Number of scans to read from string is wired to N terminal of the outermost loop. Shift register is initialized with string read from file.
First of the inner loops reads analog input data. Number of analog channels is wired to its N terminal. It's using split string to read 2 bytes at a time and then type casts data to I16. Rest of the string is wired to shift register. When every I16 channel from scan is read, rest of the string is passed to shift register of the second for loop.
Second loop is for reading CAN channels. It's similar to first loop except data is read 4 bytes at a time and type casted to SGL. When every CAN channel from scan is read, rest of the string is passed to shift register of the outermost loop. Outputs of type cast functions are tunneled out of loops to produce 2D arrays.
This way reading about 500 KB of data can take for example tens of seconds depending on PC and number of channels. That's way too long as we want to read several megabytes at a time.
I created also an example with one inner loop and all data is type casted to I16. That is extremely fast when compared to two inner loops!
Then I also made a test with two inner loops where I replaced shift register and split string with string subset. That's also faster than two inner loops + shift register, but still not fast enough. Any improvement ideas are highly appreciated. Shift register example attached (LV 7.1)
Thanks in advance,
Jakke Palonen
Attachments:
String to I16 and SGL arrays.vi ‏39 KB

OK, there is clearly room for improvement. I did some timing and my two above suggestions are already about 100x faster than yours. A few teeaks led to a version that is now over 500x faster than the original code.
A few timings on my rather slow computer (1GHz PIII Laptop) are shown on the front panel. For example with 10000 scans (~160kB data as 6+2) my new fastest version (Reshape II) takes 14 ms versus the original 7200ms! It can do 100000 scans (1.6MB data) in under 200 ms and 1000000 scans (15MB data) in under 2 seconds.
I am sure the code could be further improved. I recommend the Reshape II algoritm. It is fastest and can deal with variable channel counts. Modify as needed.
Attached is a LabVIEW 7.1 version of the benchmarking code, containing all algorithms. I have verified that all algorithms produce the same result (with the limitation that the cluster version only works for 6*I16+2*SGL data, of course). Remember that the reshape function is extremely efficient, because it does not move the data in memory. I have some ideas for further improvements, but this should get you going.
Message Edited by altenbach on 08-05-2005 03:06 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
StringI16SGLCastingTimer.png ‏48 KB
StringtoI16andSGLArraysMODTimer.vi ‏120 KB

Converting object wrapper type array into equivalent primary type array

Hi All!
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Is sound like a trivial task however the problem is that I do not know the type I work with. To understand what I mean, please read the following code -
//Method signature
Object createArray( Class clazz, String value ) throws Exception;
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//"arr" will be passed as a parameter of a method again via reflection
public void compute( Object... args ) {
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//or
Object arr = createArray( Double.class, "2%%3%%4" );
public void compute( Object... args ) {
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Unfortunately I was unable to find any useful method in Java API (I work with 1.5).
Did I make myself clear? :)
Thanks in advance,
Pavel Grigorenko

I think I've found the answer myself ;-)
Never thought I could use something like int.class or double.class,
so the next statement holds int[] q = (int[])Array.newInstance( int.class, 2 );
and the easy solution is the following -
Object primeArray = Array.newInstance( token.getPrimeClass(), split.length );
for (int j = 0; j < split.length; j++) {
     Method meth = clazz.getMethod( "valueOf", new Class[]{ String.class });
     Object val = meth.invoke( null, new Object[]{ split[j] });
     Array.set( primeArray, j, val );
}where "token.getPrimeClass()" return appropriate Class, i.e. int.class, float.class etc.

Production Order Error: "Unable to cast COM object of type 'System.__ComObj

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I have the following code:
Dim oProdOrders As SAPbobsCOM.Documents
oProdOrders = oCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oProductionOrders)
after the second line I get a system exception: {"Unable to cast COM object of type 'System.__ComObject' to interface type 'SAPbobsCOM.Documents'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{A6DA575B-E105-4585-9F4B-50CC4044EEDD}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE))."}
If I change document to eg oQuotations it proceeds normally.
Any Idea?
Thanks in advance,
Vangelis

try it as
Dim oProdOrders As SAPbobsCOM.ProductionOrders
oProdOrders = oCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oProductionOrders)

Unable to cast object of type 'Oracle.DataAccess.Types.OracleDecimal'......

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tmp.Parameters["P_ID"].SourceColumn = "ID";
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System.ArgumentException : Unable to cast object of type 'Oracle.DataAccess.Types.OracleDecimal' to type 'System.IConvertible'.Couldn't store <231> in ID Column. Expected type is Decimal.
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Hi,
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Unable to cast object of type OracleXmlType to type XmlDocument

Hello All:
I have an Oracle Procedure that is taking an XML Document as an output parameter.
oCommand.Parameters.Add("errorrecord", OracleDbType.XmlType).Value = System.DBNull.Value;
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No, I have not tried that yet, but I admit I don't fully understand the syntax in the document posted.
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Declaration
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public XmlDocument GetXmlDocument();
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Query
Select * from ci_systemobjects where SI_NAME= ''", "CrystalEnterprise.Ftp"
Assemblies required by application are registered in the GAC with same version and same public token
Please let me know if anyone has a answer for this casting exception.

Snippet:
Dim ftp As New Ftp(infoObject.PluginInterface)
Dim ftpOptions As New FtpOptions(ftp.ScheduleOptions)
You wouldn't be doing a direct runtime cast.
Sincerely,
Ted Ueda

Unable to cast object of type 'System.Xml.XmlText' to type 'System.Xml.XmlE

Hi All,
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Exception Text **************
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Steven

Hi,
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Hope this will help.
Best Regards,
Patrick

Unable to cast object of type 'Microsoft.Xrm.Sdk.Entity' to type

when I using below code :
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