I have to read a file which in .dat format and separate data based on 2 first consecutive zero byte comes. first half is json data and other half is binary data.
How should I go about it?
I tried using NSData dataWithContentsOfFile method and read it and then convert it in byte array and compare bytes. Somehow, its not working.
You can use the same kind of procedure that you would use to read a file by lines. Here and here are earlier answers on SO regarding reading a file line-by-line. Just change \n to the byte sequence that is applicable.
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How do I read a file and turn it to a RAW bit string? For example I open an image that is 512kb, It reads the file byte by byte, and it spits out the long bit string that is the file? I would like to apply some functions to the strings but I can't figure a way to unpack files consistently.
I imagine what I need is something that reads a file byte by byte with no care of the original file format... As it reads byte by byte, a giant integer like thing file bit string is created.
I used a Python's bit generator and NumPy, that seemed to work well, but The program didn't behave well with actual files. What is the best way to unpack files into 1's and 0's?
How do I read any file and store the contents as an easy to read HEX file? or BIN file? And how do I stop the "open" function from truncating leading 0's!
UGH!
Using Python or GOLANG, how do I open any file and create an uninterrupted bit string of the contents where every leading zero in a BYTE read is significant?
After looking and asking everyone I'm acquainted to I found my answer. The best way to turn any file into a RAW HEX string is by
f = open("file_name", "rb")
content = f.read().hex()
with open("File HEX bitstream.txt", "w") as text_file:
print(f"HEX Bitstream Import", content, file=text_file)
f.close()
So I have a file that I need to have in either binary or hex format. Everything that I've been able to find basically says to store the text in a string and convert it to binary or hex from there, but I cant do it this way. The file was written using its own private character set that uses null and system hex codes, so notepad doesn't know what to do with these characters and replaces it with wrong characters and spaces. This distorts the information so it wont be correct if I try to convert it to binary/hex.
I really just need to have the binary/hex information stored in a string or text box so I can work with it. I don't really need it to be saved as a file.
Never mind, I finally figured it out. I used a file stream to read the data byte by byte. I didn't understand how to convert this as the first byte data in the array was showing as 80 when i knew the binary data should've been "1010000" (i didn't realize at that time that 80 was the decimal format).
Anyways I used the bitconverter.tostring and it put everything together and converted it to hexadecimal format. So i'm all good now.
I am looking for ways to read in a PDF file with SAS. Apparently this is not basic functionality and there is very little to be found on the internet. (Let alone that google is not easy with PDF in you search giving you also links to PDF documents that go about other things.)
The only things that can be found, are people looking for ways to import data into datasets from a PDF. For me, that is not even necesarry. I would like to be able to read the contents of the PDF file in one big character variable. If possible, it would even be better to be able to read in the file's binary data.
Is this possible with SAS and how? (I got it to work in Access VBA, but can't find any similar ways in SAS.)
(In the end, the purpose is to convert this to base64 and put that base64-string into an XML document.)
You probably will not be able to read the entire file into one character variable since the maximum size of a character variable is around 33 KB. A simple way to read in one line at a time, though, is something like the following:
%let pdfFileName = Test.pdf;
%let lineSize = 2000;
data base;
format text_line $&lineSize..;
infile "&pdfFileName" lrecl=&lineSize;
input text_line $;
run;
This requires that you have a general idea of the maximum record length ahead of time, but you could write additional code to determine the maximum record size prior to reading in the file. In this example each line of text is read into one character variable named "text_line." From there, you could use a RETAIN statement or double trailers (##) in the INPUT line to process multiple lines at a time. The SAS web-site has plenty of documentation on how to read and process text from various types of input files.
I am trying to convert a file from binary to text, by simply replacing each character with the hexadecimal code. For example, character 'c' will be replaced by '63'.
I have a code which is working fine in normal systems, but it breaks down in the PC where I need to use it as it has default locale set to Chinese.
I am using the following statements to read a byte -
ch$ = " "
Get #f%, , ch$
I suspect there is a problem when I am reading the file byte by byte, as it is skipping certain bytes because they form composite characters. It's probably reading 2 bytes which form an Asian character as one byte. It is thus forming a much smaller file than the expected size.
How can I read the file byte by byte?
Full code is pasted here: http://pastebin.com/kjpSnqzV
Your suspicion is correct. VB file reading automatically converts strings into Unicode from the default code page on the PC. On an Asian code page, some characters are represented as more than one byte.
I advise you to use a Byte variable rather than a string - that will stop VB being over helpful.
Dim ch As Byte
Get #f%, , ch
Another possible problem with the original code is that some byte sequences are illegal on Asian code pages (they don't represent valid characters). So your code could experience errors for some input files, but presumably you want it to work with any file.
I'm trying to open an existent file save a bytes in the start of it to later read them.
How can I do that? Because the "&" operand isn't working fo this type of data.
I'm using Encoding.UTF8.GetBytes("text") to convert info to bytes and then add them.
Help Please.
You cannot add to or remove from the beginning of a file. It just doesn’t work. Instead, you need to read the whole file, and then write a new file with the modified data. (You can, however, replace individual bytes or chunks of bytes in a file without needing to touch the whole file.)
Secondly,
I'm using Encoding.UTF8.GetBytes("text") to convert info to bytes and then add them.
You’re doing something wrong. Apparently you’ve read text data from the file and are now trying to convert it to bytes. This is the wrong way of doing it. Do not read text from the file, read the bytes directly (e.g. via My.Computer.FileSystem.ReadAllBytes). Raw byte data and text (i.e. String) are two fundamentally different concepts, do not confuse them. Do not convert needlessly to and fro.