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Archive for the ‘LabVIEW’ Category

How to Change a Control or Indicator’s Label Programmatically in LabVIEW

December 30th, 2008

What I want to do in one of my LabVIEW program is: There is a numeric control and I’d like to change the Label of it programmatically.

In this program, I create a property node for the Label Text and change this to a writable node. And I wire a constant into this property. But when I run this program I get error message like this “Input unit is not compatible with the current unit”. It is weird,  the input is string as the property needs.

Read more…

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Howto: Creating a Microsoft Data Link file (.UDL) for Connecting to Microsoft Access in LabVIEW

December 24th, 2008

A Microsoft Data Link file or Universal Data Link is a universal file that links to a specific database and can be used by many different applications.

UDL File Creation

The way a .UDL file is initially created depends on your Windows installation. This can be created  desktop shortcut menu.

  1. Right-click on the Desktop, or in the folder where you want to create the file.
  2. Select “New” from the shortcut menu. If Microsoft Data Link is listed, select it.
  3. Windows 2000 will most likely not have a Microsoft Data Link listed. If this is the case, please refer to the next section. Read more…

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How to write and read Access database in LabVIEW

December 18th, 2008

There are a couple of different methods to communicate with Access in LabVIEW, and some are more difficult than others. You can use ActiveX Automation to open Microsoft Access and control many aspects of the Access Application. For actual database manipulation however, the Access automation classes rely upon the Microsoft DAO (Data Access Object) and/or ADO (ActiveX Data Object) classes. These classes can be used independently or through the Access automation classes to read and write data into an Access database. These classes can be difficult to use and may require a fair amount of SQL knowledge to accomplish a complicated task.

For more information about the Microsoft Access automation classes, DAO or ADO classes refer to the Microsoft website and Developer Network. Read more…

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Problem with DLL import in LabVIEW

November 19th, 2008

Today, I used the Import Shared Library wizard in LabVIEW to import one dll, followed the step by step wizard of LabVIEW, everything seemed fine till the last step. The progress bar in the Import Shared Library wizard appeared to hang.

After search in the LabVIEW official site, I got such answer:

When you use the Import Shared Library wizard, LabVIEW displays a progress bar. This progress bar might appear to hang, even though the tool is working correctly.

Workaround: Wait until the generation finishes.

Reported Version: 8.5 Resolved Version: N/A Added: 09/01/2007

And this error still not fixed in 8.5.x. It looks like I’d better upgrade from 8.5.1 to 8.6 to work around this problem.

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