Imprecise date

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• How to load a pointer data memory in table

  I'm trying to interface to a DLL used to manage a piece of hardware. The DLL is written in c. uses _stdcall and the Import Wizard has hooked up with success of most screws in a library; many of them work everything just as it is. I have also played with the knot of library function call and think that most of the time, I got the hang of it. I ran successfully for the odd Windows API call (e.g., MessageBox). However, I am a newcomer in Labview. My problem is related to a DLL function that requires a pointer to a block of memory, in which he then dealt with the material (in the form of table of UINTs) data. I want to display these data in Labview, through a table I guess. I think I found everything I need to do in terms of creating a table and hanging until the node of library function call with an input pointer.

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  I thought maybe I should allocate the memory using the Windows API (LocalAlloc LPTR flagged so I get a pointer) and I wrote a little VI that allocates and releases the memory that seems to work. This way I can release memory when the transfer is complete. MY PROBLEM is, given the pointer to the block of memory, as returned by LocallAlloc, how can I get Labview to read the memory in an array of integers.

  I am now a little stuck and would like to receive advice on one, how to convert the block of memory, or on a way to approach things btter.

  TIA

  SteveJM wrote:

  So I have a working solution, which is basically the same idea as your suggestion, but uses the Windows API. I took the trouble to mention it, but when I looked more closely at 'MoveBlock', 'DSNewPtrt' etc, I realized that they are a static C library. This means that using them requires that you have a C development system and knowledge how to build DLLs on that. As it happens that causes me a problem, but it seemed like a hammer in this case because the routines you need are already in the kernel32.dll module. [Yes that makes specific Windows, but then you would need rebuild your dll for each operating system in any case].

  This paragraph is completely inaccurate.  These functions are integrated into the runtime LabVIEW, without which your LabVIEW code will not work.  You have the guarantee that if you can run your LabVIEW code, or in the development environment or as a compiled application, these functions are available.  No need for a C development system (if that were the case, don't you think someone would have mentioned in one of the many messages on this forum on the use of MoveBlock?).

  SteveJM wrote:

  It is true that you need to find a way to pass the pointer to the destination of reference. In other words, using a "handful" I guess. One of the difficulties is that the documentation for Labview is rather imprecise on what happening coming in and out of the function call. Unfortunately, the meaning of "Handle" is very dependent on context, so documentation should be much more detailed. If you select 'Manage' rather than "Pointer table" minimum size box disappears implying that Labview will take a pointer to a pointer to a format of Labview. It would then allow the size information in the allocation of the table and set the offset pointer approprately when passing a pointer to the function that would fill the memory. If the size of the table was large enough, it might be useful to tweak with this to avoid the copy useless (and allocation), but I don't have time now, unless I find the best literature which explicitly explains this gathering takes place for each option in the dialog box.

  All the help you need is available.  Set up a call library function node to pass by handle, close the configuration dialog box, right-click on the function call library node and choose Create .c file...  You will get a draft of C with all structs defined for you, and you will see that the handful of LabVIEW table includes size information.  There is no "triage."  He is just passing pointers autour (and a few and Word-permutation of bytes due to problems of "endianness").  When you pass an array of pointer to array value, you get what you expect - LabVIEW dereferences the handle once and passes the pointer of table.  It's exactly like a C function call.  Nothing unusual occurs when the call is returned (with the exception, even once, "endianness" switch if necessary).  That said, it's a bad idea to do what you want to do with a handle, because LabVIEW is allowed to move the table when he likes and has no way to know that some other functions still has this memory block to stay where he is.

• Estimated date of the photo was taken in Lightroom

  I have a lot of older family photos I try to organize in Lightroom metadata that apply to them.  I want to be able to filter and sort the photos by date.  I was watching the "Edit Capture time dialog box "and I was wondering if there is a more flexible way for wonder information to these images on when you think they have taken.  Because they have been scanned from film and taken years or decades, we can estimate the time until a point of accuracy only.  In some cases, we know that a number of years, a specific year or a month in the year.

  'Change the Capture time... '. "seems to require the time to express themselves in any precision (i.e. year/month/day date and hour\minute\second at the moment).  However, what I really want to be able to do, is provide a date or range of dates for a large number of these photos as we usually do not know the exact day they took.  I'm not really crazy about solutions as still failing the day a value such as '1' when the day is unknown (for example, if I know that the photo was taken in June 1966, I enter on June 1, 1966) because then I lost the ability to distinguish between the pictures actually taken the first day of each month and pictures taken during a given month.  The problem becomes even worse if you try to select a month by default (say in January), if the specific month photo was taken is unknown.

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  Thank you

  David Madrian

  Recording time is a specific entity and may not be accurate.

  I suggest using the time capture and filling 1s or 0s for parts that you do not knowthe solution 1 June you're talking about, this gives you the ability to sort the photos.  Then put the effective date of the accuracy known in the caption or keywords, or even as the first part of the file name, you can also sort or use file search to filter.  You can also put photos in folders that contain the date with the precision that you think you know: YYYY, YYYY, YYYY-MM-DD MM.  Depending on your setting of subset of metadata in the right panel, you can also see a few other fields IPTC, you might want to put info in, but things to those who might be buried too deep.  Adding a keyword like circayear, circamonth, circadateyou can probably do something better, but keep one word, as well as others, such as the current month and year could tell you the accuracy in a way that is filterable if you need to review the pictures that have a certain degree of imprecision.

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