String passing
Hello world
I had a problem with frame incredibly ([ttom]-[extreme novice]). I'm trying to update the program to a former colleague who left a playback feature 2D bar code.
The barcode scanner is configured to act as a virtual keyboard and captures the data into a string which box I then passes to another chain box and clears one so that the next barcode is not added at the end of the last reading. But for some reason, the first string box clears successfully, but the second string is never updated.
For the life of me I can't understand why. The image below is the main while loop. Tried to look through the internet without a bit of luck, I hope you all can help.
ttom321 wrote:
You are constantly control with this compensation property node. Get rid of the part Val (Sgnl) of the property node.
Tags: NI Software
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What I understand from your question, you have a string entry who went from Teststand, LabVIEW and Teststand back. Len determines the amount of memory of the input string for the transfer of LabVIEW. One possible suggestion would be to define a local variable that is equal to the size of your input string, and then to set the buffer Len equal to this variable so that it passes the size of the string each time. If you do not want to redefine the size of the buffer len whenever you enter a string, just make sure that you allocate enough memory for the largest input string you will be entered. Good luck with your project!
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_Faust wrote:
I have a few questions:
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They can be pointers or buffers. Which of the two is ambiguous in the syntax of C. However, in your case I suppose that piMsgId and pcLen be a pointer to a unique value and pszDest a string buffer.
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I should pass the length of the string to the DLL or if it is read
Description is not really clear however most of the C API require today the length of the allocated buffer at the entrance to make sure that they don't overrun the buffer length. They may or may not change this value before returning to indicate the amount of data they actually informed. The pcLen parameter passed by reference probably indicates that this function does this way.
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It is not necessary. You can simply set the parameter to a string and must be passed as a C string pointer. In LabVIEW 8.5 or more you can also configure to resize this string for the number of characters as indicates it a different setting of the library to compose the node (CLN), in this case your pcLen. 8.5 you can use a table to explicitedly initialization function create a table Bbyte of the length needed, convert the byte array to string and pass to the CLN parameter. LabVIEW will return automatically only the part of the string up to the NULL character if a CLN is configured as C string pointer
Now I can also write strings:
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No! If you configure the parameter is a string, passed as a string pointer C, LabVIEW will do it automatically for you.
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The leak memory occurred if you can run the following code:
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Note, National Instruments shows help following: «...» "When returning a new array from a DLL, you must allocate memory for the array in LabVIEW. To do this, the easiest method is to enter a picture of a known length in the node to call a library function that is at least as large as the resulting array expected returned by the DLL... »
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Thanks for reading this postBANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production PL/SQL Release 11.2.0.1.0 - Production CORE 11.2.0.1.0 Production TNS for 32-bit Windows: Version 11.2.0.1.0 - Production NLSRTL Version 11.2.0.1.0 - Production
* 009 *.with t1 as ( select 'HP|250 GB * 2 + 80 GB * 3 + 100 GB | SATA' str from dual union all select 'INTEL|40 GB + 55 GB| IDE' from dual ), t2 as ( select regexp_substr(str,'^[^|]+') mk, trim(regexp_substr(replace(str,'|','+'),'[^+]+',1,column_value + 1)) element, regexp_substr(str,'[^|]+$') typ from t1, table( cast( multiset( select level from dual connect by level <= length(regexp_replace(str || '+','[^+]')) ) as sys.OdciNumberList ) ) ) select mk, trim(regexp_replace(element,'\*.*$')) val, typ from t2, table( cast( multiset( select level from dual connect by level <= substr(regexp_substr(element,'\*.*$'),2) ) as sys.OdciNumberList ) ) / MK VAL TYP ---------- ---------- ---------- HP 250 GB SATA HP 250 GB SATA HP 80 GB SATA HP 80 GB SATA HP 80 GB SATA HP 100 GB SATA INTEL 40 GB IDE INTEL 55 GB IDE 8 rows selected. SQL>SY.
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SPGAnne wrote:
> I wonder if there is a way to easily calculate how wide to make a textfield
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