Questions concerning type casting

can anybody give me a short hint where I
can learn more about type casting in
LabView 5.1. Ecspecially what converting
4.x data means and where to find this in
the online reference ...
Thanks for your support,
Holger Hofmann

Holger Hofmann wrote:
> can anybody give me a short hint where I
> can learn more about type casting in
> LabView 5.1. Ecspecially what converting
> 4.x data means and where to find this in
> the online reference ...
>
> Thanks for your support,
>
> Holger Hofmann
Holger,
Typecasting and 4.x conversion are 2 different things (well sorta)
The way that LabVIEW stored booleans (in memory etc) was changed after
version 4.x
In ver4.x a bool was 16-bits Bit 15 low = FALSE, bit 15 high = TRUE
Since ver5.0 bool is 8 bits, all 0's = FALSE, non-zero = TRUE.
Typecasting is a more general concept, in that it converts from one data
type
to another. For example I can type cast a Boolean to a U8 (which is what the
convert 4.x does). I wire a bool to the typecast, a constant to
the "type"
and a U8 indocator to the output. On my machine I get 0=FALSE and 256 =
TRUE.
you can use this for any datatypes that you wish.
Check the knowlwdgebase on NIs site (search for 4.x data)
Kevin Kent

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Hello,
I would recommend Acronis to do this job. Here is a link at thinkpad-forum.de.
You´ll get Acronis for free if you buy a PCWelt.
Your answers:
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B: yes
C: yes
D: yes
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Type Casting? When to use this concept?

There is one question bothering me very very much.
When should I use type casting?
For example
ClassNameQ c = (ClassNameQ) ......displayable
How do I know which 'cast type' to use? Is there a suitable pattern
we need to follow so that we can know 'Ah this is the cast
we need to use'
Please can any one point out which 'Cast type' points needs to be
followed?
Regards

You can Cast an object from any subclass to its superclass,
or from a superclass to the sublass, if the object is already
an object of the subclass.
I have a class named Name:
public class Name {
I have a subclass named LastName:
public class LastName extends Name { [/b]
And another named FirstName:
[b]public class FirstName extends Name { [/b]
I create an object like this:
[b]LastName ln = new LastName("Johnson");
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capitalFirstLetter(ln);
capitalFirstLetter(Name n) {
Now n in CapitalFirstLetter can be used only as a Name
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So if I need to use things specific to LastName I have to cast
the object to LastName. There is a problem, however, since this
method can work on all Names, so I don't know if the Name is
a LastName or not. The object itself DOES know, however, and
we can test, so we would cast to a subclass as follows:
if (n instanceof LastName) {
LastName ln = (LastName)n;
ln.addToGeneology();
} else of (n instanceof FirstName) {
FirstName fn = (FirstName)n;
fn.addOccurance();
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Message was edited by: Gerardo hernandez

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Hello all,
Can we type cast class into interface?
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You don't need to explicitly typecast a class to an interface, if the class is implementing the interface.
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Could not type cast in java embedding

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
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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

Dynamic [Runtime] type casting in Java

Hello,
This is my requirement.
I have a method that takes class name as a parameter.
Ex:
Object myMethod(String classname){
Object xyz = getObject(); //userdefine method which returns some object
/*I need to typecast above object with the class name passed as the method parameter*/
/*How can i type cast this object*/
Object obj = (classname) xyz;
return obj;
In the above example, how can i dynamically typecast the object with class whose name is passed as the method parameter?

Hello,
This is my requirement.
I have a method that takes class name as a parameter.
Ex:
Object myMethod(String classname){
Object xyz = getObject(); //userdefine method which
returns some object
/*I need to typecast above object with the class
name passed as the method parameter*/
/*How can i type cast this object*/
Object obj = (classname) xyz;
return obj;
In the above example, how can i dynamically typecast
the object with class whose name is passed as the
method parameter?Perhaps a little more background on the project (what you are trying to do) will help the experts here answer?
/*with a class that takes a noarg constructor*/
public Object getObject(String classname) throws Exception
//might want to get a bit more specific with which exceptions it will throw
return Class.forName(classname).newInstance();
}Do I think this sometimes is indicative (perhaps even more often than not), of a possible design flaw? Yes..
It gets a little trickier if you have constructors (you have to create a Class object representing the string with the .forName(..) ..and then use some reflection to determine constructors and then a bit of logic to determine which of those to use...)
~Dave

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I've got the following problem.
I use a receive function which waits for an undefined package. (struct package).
The problem is i can't specify the module with the exaxt package.
Generally in C i define a Pointer and create enough buffer for it. Is it the same in TestStand?
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for example:
i've got these packages
struct packet;
struct data;
the function does not know which structure to receive.
err = receive(buffer,maxlen);
how do i specify the buffer variable?
can i create a type "void" with a String to have enough buffer.
and then to make a type cast, for example "Locals.dataobject = ((data)Locals.buffer)"
any ideas?
thx for help

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Hope this helps!
André

Help needed in data type casting

I have a java program which will receive data and its type in the String format. During program execution, the data in the String data has to be converted into the respective data type and assigned to a variable of that data type so that it could be used in the program. Programmer may not know the type of data that the value has to be converted into.
I really got struck up with this. This is a RMI application and one process node is sending the data to another node in the String format and the type of data it should get converted into so that it can be converted into the respective type and used for computation.
Can you understand what I am asking for ....if you can pls help and it is highly appreciated

I dont know whether i ahve expressed it correctly
look at this code
dataPacket sendtoNode = send.senDatatoNode(inputReq);
String recnodnum = sendtoNode.nodeNum;
String recvarnum = sendtoNode.varNum;
String recvartype = sendtoNode.dataType;
String recvalvalue = sendtoNode.dataVal;
int num; int type;
double result;
// here in this case the result variable type is double
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 result = Integer.parseInt(recvalvalue); will pose problem
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 if (recvartype.equals("double")){
 type = 2;
 result = Double.parseDouble(recvalvalue);
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 if ((recvalvalue.equals("true")) || (recvalvalue.equals("TRUE")))
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 type = 5;
 result = (char)recvalvalue; will pose problem
else
if(recvartype.equals("String")){
 type = 6;
 result = recvalvalue; will pose problem
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 type = 7;
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 type = 8;
 result = Long.parseLong(recvalvalue); will pose problem
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 type = 9;
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 //forvarval varvalue = new forvarval();
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// this has to be done after sorting the problem of type casting string result = recvalvalue;
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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

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Dynamic Type casting

Can we dynamically type-cast an object reference passed to Object Clss to that specific class?
Here is what I want to do.
I am going to pass an object reference to a method, which has Object class as parameter to it, as shown below. Using getClass() or some other way, I want to dynamically typecast this reference to the original Class and call some method of this Class.
void test (Object ref1){
((ref1.getClass())ref1).writeLog();
By doing this, am I violating the basic Object Orineted rules?

I mean, consider an hypothetical case (which is wrong
from OO point of view) that there are suppose 10
classes in my system. None of them related to each
other, all are independent classes. But each one has a
method called, writeLog(). Now I want to write one
method which will be called by each of these classes
(in some 11th class), which will have "Object" as a
parameter. Now using the actual reference I want to
call the corresponding writeLog() method.
1 - Point out to management that the design is now officially broken.
2 - Point out that if the design is not fixed then any solution that impliments the changes will cost more to maintain in the future and will likely lead to instabilities in the system (due to complexity.)
3 - Implement one of the suggested solutions and make sure that you put in a lot of error checking and logging in the hacked solution.
4 - Produce extensive documentation about the impact of changing any of the objects that you are relying on. Push it to anyone and everyone that might ever touch or even suggest changes to the code.
Doing all of the above allows you to live stress free when the next revision breaks because someone didn't understand the implications of your hacked solution. You will be able to find the problem quickly and point out that it had nothing to do with your code but rather because someone else did not follow the complete documentation that you produced. And then when they complain that your solution was a hack you can point out that you explained that previously as well.

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