read-write

来源： https://stackoverflow.com/questions/63604878/is-setvalues-slower-than-setvalue

问题 I am trying to open and read file that was been saved either on the sdCard or on the google drive or on the internal memory by using the android file chooser ... after I successfully chosen the file and I get the file path as shown on the following code when I try to read it it keeps throwing me the that the file does not exist / no such file or directory .... my code: public class MainActivity extends AppCompatActivity { private static final int CHOOSE_FILE_REQUEST_CODE = 1; String[] ids;

问题 So I've got the basic code for this however due to the while loop I'm using, I can really only write the last line of the text file to the new file. I'm trying to modify the text from testfile.txt and write it to a new file named mdemarco.txt . The modification I'm trying to do is add a line number in front of each line. Does anybody know a way to maybe write the contents of the while loop to a string while it runs and output the resulting string to mdemarco.txt or anything like that? public

问题 So I've got the basic code for this however due to the while loop I'm using, I can really only write the last line of the text file to the new file. I'm trying to modify the text from testfile.txt and write it to a new file named mdemarco.txt . The modification I'm trying to do is add a line number in front of each line. Does anybody know a way to maybe write the contents of the while loop to a string while it runs and output the resulting string to mdemarco.txt or anything like that? public

问题 I wrote a python code to read and write to a hadoop file system with IP hdfs_ip . It takes 3 arguments - local_file_path remote_file_path read_or_write When I want to run it, I will first need to export the namenode IP, and then run the python code with the 3 arguments. However, I am getting some strange errors. $ export namenode='http://hdfs_ip1:50470,http://hdfs_ip2:50470' $ python3 python_hdfs.py ./1.png /user/testuser/new_1.png read ['http://hdfs_ip1:50470', 'http://hdfs_ip2:50470'] ./1

问题 I am trying to find a library that overwrites an existing cell to change its contents using Python. what I want to do: read from .xlsx file compare cell data determine if change is needed. change data in cell Eg. overwrite date in cell 'O2' save file. I have tried the following libraries: xlsxwriter combination of: xlrd xlwt xlutils openpyxl xlsxwriter only writes to a new excel sheet and file. combination: works to read from .xlsx but only writes to .xls openpyxl: reads from existing file

问题 I tried to use the read/write file descriptor in bash so that I could delete the file that the file descriptor referred to afterward, as such: F=$(mktemp) exec 3<> "$F" rm -f "$F" echo "Hello world" >&3 cat <&3 but the cat command gives no output. I can achieve what I want if I use separate file descriptors for reading and writing: F=$(mktemp) exec 3> "$F" exec 4< "$F" rm -f "$F" echo "Hello world" >&3 cat <&4 which prints Hello world . I suspected that bash doesn't automatically seek to the

问题 Here are my files. How can I write this array: var listOfTasks = [["Hi", "Hello", "12:00"],["Hey there", "What's up?", "3:17"]] to a .txt file ( file.txt )? I know there are other questions about this, but they're in other languages (not Swift). I'd like for it to work on an actual iPhone. I'm happy to provide additional information if necessary. I'm new to Swift, so excuse my question if it seems too simple. NOTE: I am asking specifically about arrays containing arrays. Thanks in advance!

问题 I'm trying to figure out if it is possible to open a file from a Progressive Web App with the default system application. The idea is that a PWA would store for offline use some files (e.g. a .docx file), and that the user would be able to open them without (re)downloading them. The ideal situation would be that the PWA is able to load into memory the file, make it accessible to the default system application for that file type (e.g. Word for .docx files), watch for changes (i.e. the user

问题 i have one xml name 1.xml like that <?xml version="1.0" encoding="utf-8"?> <domains> <domain url="www.google.com" id="123"/> <domain url="www.yahoo.com" id="123"/></domains> Now i want to read this xml file. i have put this xml in res>xml folder. How can i read this xml file ? in addition i want to add new some new url in this xml ? so is it possible programmatically ? 回答1: For reading values from XML file in res folder, Use the following code- try { String jsPath = "1.xml"; InputStream input