Convert Back to OLE Variant

Example VI attached.
I aquire an image from a fingerprint reader, extract the template (digital way of uniquely identifying people), and save the template to disk. Later, I acquire a new image, extract the template, and use the appropriate ActiveX method to compare the template against the stored version. The template is OLE Variant, which cannot be stored to binary file. If I store the Variant as an array of U8's instead, I am able to retrieve the U8's from the file, and convert to LabVIEW Variant. The ActiveX method compares correctly, but sluggishly. Any way to convert back to OLE Variant?
Thank you,
Jason
Certified LabVIEW Architect
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Separate Views from Implementation for Strict Type Defs
Attachments:
Retrive Stored Fingerprints & Identify Current.vi ‏30 KB

I'd like to focus on saving and retrieving OLE Variant data. The methods used to compare fingerprints (i.e. IdentifyPrepare and Identify in my example) work properly and rely on other settings (threshold and rotation tolerance), so I'd rather not architect my own. (Thank you for your comment, Mike).
Anyone ever successfully "type casted" back to OLE Variant?
Thanks!
Jason
Certified LabVIEW Architect
Wait for Flag / Set Flag
Separate Views from Implementation for Strict Type Defs

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I am currently exploring the scripting power of labview and have some serious issues with converting a simple OLE variant to a LV datatype. I also tried with OpenG tools. Take a look at my example script
The ActiveX reference to FileSystemObject works with windows XP and maybe some older windows operating systems. Thanks
Aart-Jan
Attachments:
list_drives.llb ‏293 KB

aartjan,
OpenG Data Tools are for LabVIEW Variant data only. AcviveX Variant is a totally different beast under the same clothes.
However, the solution to your problem is simple. The variant type VT_R8 tells that it is a 8 byte real value, e.g. a LabVIEW double. You simply use "Variant to Data" to convert it to a LabVIEW double. See the attached VI. Also notice the use of "Format into String" to generate the string, a node that is much more convenient to use than string concatenation.
LabVIEW, C'est LabVIEW
Attachments:
list_drives.vi ‏35 KB

Is it possible to convert LabView data into OLE variant?

Hi. I'm using Activex Data Objects (ADO) to communicate with MySQL. Some ActiveX methods give OLE variant output, with "Variant Type" like "VT_ARRAY|VT_UI1", "VT_UI1" or "VT_BSTR". With some deduction and trial and error is relatively simple to extract data from this OLE variants and convert them to LabView data types. The problem is when I try to input variant data to some ActiveX methods, it almost always give me errors, I suppose because it expects the same type of the outputs, this is: OLE variants. Now, the question is: ¿Is there any way to convert LabView data into OLE variant data? ¿How?
I've been searching and found a lot of posts about problems when passing variant data into ActiveX, saying that sometimes SAFEARRAYs are needed, sometimes saying that there were some bugs in LV6, giving some workarounds to this bug and saying that it is fixed in LV7.1, but the supposed workarounds don't work and the bug is still present in LV7.1, if it is really a bug.
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Below I describe how to handle OLE Variants, but I wanted to mention that LabVIEW does have a Database Connectivity toolkit (http://sine.ni.com/nips/cds/view/p/lang/en/nid/6429) that has already created a set of VIs for ADO. You might check that out first.
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http://detritus.blogs.com/lycangeek

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Adobe X PDF files converted to jpg, edited and converted back to PDF have ragged, unclear text. I didn't have this problem with Acrobat 9 standard. What is the remedy for this. If this is the best I can expect, I won't be able to use X standard.

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Is it possible to convert from string to variant?

Hi!
I would like to convert a text string to variant. I'm doing this because I would like to merge a couple of signals and then save all the signals in a lvm-file. Could someone please explain how to convert from text to variant, is it possible?
Thanks in advance!
Regards,
Mattias
Attachments:
Merge signals.JPG ‏27 KB

What you are attempting to do is possible, but might not give you the results you expect. All you need to do is convert your string to an array of U8s using the String to Byte Array conversion primitive. In the file, you will get a single character per line of the file expressed as the ASCII code. When you read it, convert to U8s, then use Byte Array to String to get your string back.
You may also want to read up on LVM files. There are several places to put strings that work a little better than this.
This account is no longer active. Contact ShadesOfGray for current posts and information.

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Hello, thank you for responding.
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**** Pls rate all useful responses ****

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Good Luck and Best Wishes.
P.S.
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How to convert back from UTF8 to ISO-8859-1 encoding?

hi,
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I try this:
1")
$utf8 = [System.text.Encoding]::UTF8
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$iso.GetString($isoBytes)
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You can't. UTF-8 strips all of the information from the characters so you cannot know which characters are which. If you know which characters you need to fix (requires knowing the spelling of the words) you could possible develop an matrix of
replacements. There is no simple one line method.
¯\_(ツ)_/¯

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ColeeLou2,
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I shoot with and use sRGB, which apparently LR will recognize.
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L.M.Cohen

Convert Back to OLE Variant

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