I'm trying to add a barcode to a report using Jasper Reports in UPCA format. My scancodes are strings, but Barcode4j expects a 12 digit Integer. I can convert this to an Integer, but if there is a leading zero, it is lost, and thus my scancode is now 1 digit too short.
So, how can I use the UPCA format with scancodes that have a leading 0 and keep the leading 0?
Barbecue seems to have the same issues, so I don't imagine using it as opposed to Barcode4j will solve this issue.
Well, it all came down to my test data. Using random numbers is what was causing it to fail. When I looked up UPCA examples and used those, then it worked fine. I didn't have to parse it as an Integer either.
Related
As stated in the title, I have two tables I'm attempting to link. Both Strings appear to be a match, however Crystal Reports is not picking it up. The only thing I can think is that that length of the field is different, even though the strings are the same. could that cause a discrepancy? If so how can I correct for it? Thank you
Length of the string will prevent a match. If you are using the Trim(string) function, that only removes spaces found at the beginning or end of your string, so the two strings could still be of different lengths after using this function. You will need to use another function to capture a substring of the original string. To do this you can use the Left(string, length) function to ensure both strings are the same length.
If they still do not match then you may have non-printable characters in one or both of your strings. Carriage Return and Line Feed tend to be the most commonly found non-printable characters. A Carriage Return is represented as Chr(10), while a Line Feed is represented as Chr(13). These are Built In Constants similar to those found in VBA and Visual Basic.
You can use a find and replace to remove them with the following formula. Its not a bad idea to also include the trim and left functions in this as well to ensure you get the best match possible.
Replace(Replace(Left(Trim({YourStringField}), 10),Chr(10), ""),Chr(13), "")
There are a few additional Built In Constants you may need to check for if this doesn't work. A Tab is represented as Chr(9) for example. Its very rare for strings to contain the other Built In Constants though. In most cases Carriage Return and Line Feed are the only ones that are typically found in Plain Text. Tabs and the other constants should only be found in Rich Text and are very rare in string data.
I'm converting a rather large old fix-format code written in Fortran 77 to free-format. Within the code I frequently encounter read statements like
DOUBLE PRECISION :: VARIABLE
read(1,10) VARIABLE
10 format(2A10)
However, what it reads from input file is in fact a line of string. The code runs perfectly fine, but it crashes when one tries to read VARIABLE from a namelist instead of a fixed format input file.
How is this possible in Fortran? Is there any reference where I can find more information about?
Any help is greatly appreciated.
This comes from the days before F77 when doubles and integers were used for storing characters. From the format statement, this is probably from a CDC which could store 10 six bit characters in each word. Double precision was two words so it was two lots of 10 characters. If you change the code to
CHARACTER(LEN=20) VARIABLE
READ(1,10) VARIABLE
10 FORMAT(A20)
It should work. There isn't a lot of information about on CDC compilers. I've never tried using a namelist with one so I can't really comment about it. Try http://bitsavers.trailing-edge.com/pdf/cdc/cyber/cyber_70/chippewa/Chippewa_Fortran-Run_Apr66.pdf
When working in the Moovweb SDK, length("çãêá") is expected to return 4, but instead returns 8. How can I ensure that the length function works correctly when using Unicode characters?
This is a common issue with Unicode characters and the length() function using the wrong character set. To fix it you need to set the charset_determined variable to make sure the correct character set is being used before making the call to length(), like so in your tritium code:
$charset_determined = "utf-8"
# your call to length() here
In Unicode, there is no such thing as a length of a string or "number of characters". All this comes from ASCII thinking.
You can choose from one of the following, depending what you exactly need:
For cursor movement, text selection and alike, grapheme clusters shall be used.
For limiting the length of a string in input fields, file formats, protocols, or databases, the length is measured in code units of some predetermined encoding. The reason is that any length limit is derived from the fixed amount of memory allocated for the string at a lower level, be it in memory, disk or in a particular data structure.
The size of the string as it appears on the screen is unrelated to the number of code points in the string. One has to communicate with the rendering engine for this. Code points do not occupy one column even in monospace fonts and terminals. POSIX takes this into account.
There is more info in http://utf8everywhere.org
I already searched for answers to this sort of question here, and have found plenty of them -- but I still have this nagging doubt about the apparent triviality of the matter.
I have read this very interesting an helpful article on the subject: http://www.joelonsoftware.com/articles/Unicode.html, but it left me wondering about how one would go about identifying individual glyphs given a buffer of Unicode data.
My questions are:
How would I go about parsing a Unicode string, say UTF-8?
Assuming I know the byte order, what happens when I encounter the beginning of a glyph that is supposed to be represented by 6 bytes?
That is, if I interpreted the method of storage correctly.
This is all related to a text display system I am designing to work with OpenGL.
I am storing glyph data in display lists and I need to translate the contents of a string to a sequence of glyph indexes, which are then mapped to display list indices (since, obviously, storing the entire glyph set in graphics memory is not always practical).
To have to represent every string as an array of shorts would require a significant amount of storage considering everything I have need to display.
Additionally, it seems to me that 2 bytes per character simply isn't enough to represent every possible Unicode element.
How would I go about parsing a Unicode string, say UTF-8?
I'm assuming that by "parsing", you mean converting to code points.
Often, you don't have to do that. For example, you can search for a UTF-8 string within another UTF-8 string without needing to care about what characters those bytes represent.
If you do need to convert to code points (UTF-32), then:
Check the first byte to see how many bytes are in the character.
Look at the trailing bytes of the character to ensure that they're in the range 80-BF. If not, report an error.
Use bit masking and shifting to convert the bytes to the code point.
Report an error if the byte sequence you got was longer than the minimum needed to represent the character.
Increment your pointer by the sequence length and repeat for the next character.
Additionally, it seems to me that 2
bytes per character simply isn't
enough to represent every possible
Unicode element.
It's not. Unicode was originally intended to be a fixed-with 16-bit encoding. It was later decided that 65,536 characters wasn't enough, so UTF-16 was created, and Unicode was redefined to use code points between 0 and 1,114,111.
If you want a fixed-width encoding, you need 21 bits. But they aren't many languages that have a 21-bit integer type, so in practice you need 32 bits.
Well, I think this answers it:
http://en.wikipedia.org/wiki/UTF-8
Why it didn't show up the first time I went searching, I have no idea.
I am writing a function that transliterates UNICODE digits into ASCII digits, and I am a bit stumped on what to do if the string contains digits from different sets of UNICODE digits. So for example, if I have the string "\x{2463}\x{24F6}" ("④⓶"). Should my function
return 42?
croak that the string contains mixed sets?
carp that the string contains mixed sets and return 42?
give the user an additional argument to specify one of the three above behaviours?
do something else?
Your current function appears to do #1.
I suggest that you should also write another function to do #4, but only when the requirement appears, and not before .
I'm sure Joel wrote about "premature implementation" in a blog article sometime recently, but I can't find it.
I'm not sure I see a problem.
You support numeric conversion from a range of scripts, which is to say, you are aware of the Unicode codepoints for their numeric characters.
If you find an unknown codepoint in your input data, it is an error.
It is up to you what you do in the event of an error; you may insert a space or underscore, or you may abort conversion. What you would do will depend on the environment in which your function executes; it is not something we can tell you.
My initial thought was #4; strictly based on the fact that I like options. However, I changed my mind, when I viewed your function.
The purpose of the function seems to be, simply, to get the resulting digits 0..9. Users may find it useful to send in mixed sets (a feature :) . I'll use it.
If you ever have to handle input in bases greater than 10, you may end up having to treat many variants on the first 6 letters of the Latin alphabet ('ABCDEF') as digits in all their forms.