binary-data

问题 This seems to be the type of question that should have a lot of duplicates and plenty of answers, but my searches have led only to frustration and no useable solutions. In Python (preferably 3.x), I would like to know how I can open a file of an arbitrary type, read the bytes that are stored on disk, and present those bytes in their most 'native', 'original', 'raw' form, before any encoding is done on them. If the file is stored on disk as a stream of 00010100 10000100 ... then that's what I

问题 How does one process large binary data files in Clojure? Let's assume data/files are about 50MB - small enough to be processed in memory (but not with a naive implementation). The following code correctly removes ^M from small files but it throws OutOfMemoryError for larger files (like 6MB): (defn read-bin-file [file] (to-byte-array (as-file file))) (defn remove-cr-from-file [file] (let [dirty-bytes (read-bin-file file) clean-bytes (filter #(not (= 13 %)) dirty-bytes) changed? (< (count clean

问题 I open my file like so : f = open("filename.ext", "rb") # ensure binary reading with b My first line of data looks like this (when using f.readline() ): '\x04\x00\x00\x00\x12\x00\x00\x00\x04\x00\x00\x00\xb4\x00\x00\x00\x01\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x18\x00\x00\x00\x01\x00\x00\x00\x02\x00\x00\x00\x03\x00\x00\x00\x04\x00\x00\x00\x05\x00\x00\x00\x06\x00\x00\x00:\x00\x00\x00;\x00\x00\x00<\x00\x00\x007\x00\x00\x008\x00\x00\x009\x00\x00\x00\x07\x00\x00\x00\x08\x00\x00\x00\t\x00

问题 I'm trying to create a script that pulls an image out of the database and displays it to the user, called by <img src="viewImage/someImageName"> But the problem I'm having is when the image is displayed all of the Nulls (0x00) are replaced by 0x20 and I have no idea why. The data in the database shows it being nulls but somewhere along the way it gets changed to 0x20s. Does anyone have any idea? is there something I'm missing? Here is the code I'm using: $data = $this->Image->read(NULL,

问题 I have a plots table, whose columns include plot , which stores the binary data of an image file. I'm running a T-SQL query which calls an R script and gets back a data frame of the data to insert. The data frame looks like this: plot name date_from date_to 1 ABCDEF plot1 2016-08-25 2016-08-31 2 AAAAAA plot2 2016-08-25 2016-08-31 As you can see, the plot column contains raw data already. To clarify, what I want to do is insert two rows into the database with the data in the data frame (the

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I am looking for a complete example of large binary data transfer with Hessian (java) caucho implementation. Where can I found one ? 回答1: Tried this? http://hessian.caucho.com/doc/hessian-overview.xtp#Hessian with large binary data 来源： https://stackoverflow.com/questions/3146031/hessian-with-large-binary-data

问题 I am using C++ on Arduino. Suppose I have a stream of binary data; binary data: 0xFF, 0x00, 0x01, 0xCC I want to convert it to the ASCII equivalent and store it in a String object type. The converted string should look like this "FF0001CC". Here are some draft code. char buffer[100]; String myString; for (int i=0; i < numBytes; i++) { //assume buffer contains some binary data at this point myString += String(buffer[i], HEX); } The problem with this code is that myString contains FF01CC , not

问题 I have a dataframe in which I want to create a new column with 0/1 (which would represent absence/presence of a species) based on the records in previous columns. I've been trying this: update_cat$bobpresent <- NA #creating the new column x <- c("update_cat$bob1999", "update_cat$bob2000", "update_cat$bob2001","update_cat$bob2002", "update_cat$bob2003", "update_cat$bob2004", "update_cat$bob2005", "update_cat$bob2006","update_cat$bob2007", "update_cat$bob2008", "update_cat$bob2009") #these are

问题 I just wanted to know how I can store a picture in oracle data base ; 回答1: Well, as with anything in oracle, there are a handful of ways to store a photo. You can store it as a BLOB and should be pretty easy to implement loading photos into that type of field. A blob (in 10g) can store up to 8 terabytes in size. You could also use the READ_IMAGE_FILE and WRITE_IMAGE_FILE functions built into oracle forms and use a RAW datatype as opposed to a BLOB datatype. References: Asktom on READ_IMAGE

问题 For given n inputs, I need to generate all possible input combinations using C++ eg. n =4 I need to get, 1010101010101010 1100110011001100 1111000011110000 1111111100000000 (EDIT : In case this is not clear, these are the input combinations read column-wise) I need these to perform operations like & and | so it would be best if I get them in their integer representation as n different variables. I tried doing it using bitset for 32 input combinations but it took a long time to process. I was