jaehov

QUOTE (mesmith @ Mar 17 2009, 03:42 PM)

Nope, that's what you have to do. Unless you're trying to access static methods or properties, you have to instantiate the object with the constructor node before any object exists that has any methods or properties.

Mark

ok sounds good. But just out of curiosity, what did you mean by access "static" methods or properties? What Labview controls would I use then?

thanks

J

Hello Techies

I wanted to make a reference to a .NET .dll for use in Labview.

I started out by creating a .NET Refnum control and then connecting that to a Property Node. I could see all the properties, but when I ran the VI, I got Error 1172

(see the attachment)

My 2nd idea was to use a Constructor (for the object I wanted), then connect that to the Property Node. Now this seems to work with no error.


My question is:

1) Is there a better way of referencing the dll in my VI other than using a Constructor (...then getting the properties?) or am I doing this correctly with the 2nd idea?


thanks

The Rookie

QUOTE (lvABC @ Feb 17 2009, 06:59 PM)

Here is an example, hope this helps!

GREAAAAT! This works like a charm! Thanks for EVERYONE

QUOTE (jaehov @ Feb 19 2009, 11:02 AM)

QUOTE (Mark Yedinak @ Feb 17 2009, 04:54 PM)

This will work nicely provided he has 64 bit integers. Based on an earlier post of his he needed to do this on without 64 bit integers for numbers larger than 32 bit integers. That was the reason I was suggesting converting the string to a byte array and processing that. That solution will work for abitrarily large numbers.

Yes. I am in the labview 7.1 environment. So I am without the use of the Labview U64 capability.

Hello Code Gurus

I would like to convert a labview decimal string, e.g. "242992472391692" into an equivalent HEX String "DD001800000C"

Can someone show me how to do this?

thanks

new kid on the block

QUOTE (Mark Yedinak @ Feb 15 2009, 04:15 PM)

Without using a different data type such as a double then your only real option is to handle 64 bit integers yourself. You would have to do this by using two 32 bit integers and creating your own methods for operating on those values. this would be a non-trivial exercise but if you must have them in integer format this is one of your only real alternatives. Much more memory intensive but possibly easier to work with and more extensible would be to store each digit of the number as an element of a byte array. Again, you have to create your own methods for operating on the numbers but they would be fairly straight forward to implement. Think back to your early days of learning math.

thanks for the response. Can you help me with my example VI ? I have connected my string control to a unsigned byte array. Im unsure of where to go from here??

http://lavag.org/old_files/post-7622-1234806972.vi'>Download File:post-7622-1234806972.vi

QUOTE (jdunham @ Feb 15 2009, 01:22 AM)

Umm, that number fits fine in an I32. Assuming you are really having a problem, why not use DBLs? Just because it's not limited to integers doesn't mean its a bad choice for them if U32 is too small.

i actually got the number wrong, its longer than that. Try "12345678991234567899"

Hey techies

I am working with a pre-existing test tool with LV 7.1

I need to convert a Decimal String "1234567899" to an Integer equivalent (no truncation or other formatting)

Essentially I want the string "1234567899" to be converted to the Integer (1234567899)

I know in LV 8 this would be a breeze with U64. But how can I perform get same result in LV 7.1 ?

thanks

The new guy on the block

Jeff

Problem Solved! .....No more Error 1172 !!!

I had to go to the Block Diagram and create a constructor. Once I created the constructor, I then imported the .NET dll.

The constructor was then wired to an Invoke Node....exposing the dll methods and properties

I attached a word document for viewing pleasure

~jaehov

Can you show us any of the code that you're using? (at least a screenshot?)

One thing that I forgot to include in my post yesterday is that you need to call the .NET constructor before you can use the reference. On your block diagram pallette -- Connectivity -> .NET -> Constructor. Use this to create your .NET reference instead of dropping down and using the .NET refnum control on the front panel (You'd use this method to pass the already created refnum to a subVI after you call the constructor to create the refnum).

See if the constructor fixes your problem. There's also a few .NET examples with LabVIEW that can give you an idea, too.

Download File:post-7622-1170452589.doc

Hello All

I have a dll that was created in .NET

I can open the dll within LV8 and I can see the methods and properties.

One of the methods is called "Multiply". Multiply takes 2 inputs (x,y) and then gives a result.

x and y are both int32

I input values for x and y , run my program, "RPSTestLibrary.VI" , ...then I get the Error code 1172.

"Error calling method RPSTestLibrary.RPSInfo.RPSMultiply of NULL ObjectId, (System.ArgumentNullException: Key cannot be null.

Parameter name: key) in RPSTestLibrary.vi"

Does anyone know how to fix this error?

~j

Hey Jeff

Thanks for the response!!...I can see the methods and properties for my .NET dll !

.NET refnum in LV 8.2 is found under the "Modern" controls palette >> "Refnum"

Have a Great Day

ps. I did have .NET 1.1 SP1 installed

~J

First of all, make sure you have the latest .NET framework off microsoft.com (You need at least .NET 1.1 SP1 for LabVIEW). If you have VS.NET, you're probably OK.

Drop a .NET refnum on your front panel. On your block diagram, right click it and select "Select .NET Class" > Browse... You can select the DLL to use and the .NET class inside the DLL to use. From there, wire up a property node or invoke nodes to use the properties/methods of the .NET DLL.

Hello All

I have a dll that was created in Visual Studio .NET and I want to open it within Labview 8...(Windows XP)

I want to view all the methods and properties contained in the .dll

Does anyone know how to expose the .NET dll within Labview?

thanks

Hov