copy

问题 I am trying to copy files using file utils copy file method. I am running in to some issues where an exception is some times thrown java.io.IOException: Failed to copy full contents from 'path.xml' to localfile.xml I have googled and seen in the code that this exception is thrown when the target file length is different to the destination file length, The exception only occures some times - this could be due to the fact that the file i am trying to copy is consistantly updating so i might

问题 I have some questions related to copying a folder structure. In fact, I need to do a conversion of pdf files to text files. Hence I have such a folder structure for the place where I import the pdf: D:/f/subfolder1/subfolder2/a.pdf And I would like to create the exact folder structure under " D:/g/subfolder1/subfolder2/ " but without the pdf file since I need to put at this place the converted text file. So after the conversion function it gives me D:/g/subfolder1/subfolder2/a.txt And also I

问题 I'm trying to implement a user-friendly way to copy some text from a text input field to the clipboard on iOS/Safari. I understand there is no way to programmatically do it on this platform, but I was hoping I could guide the user experience as much as possible. On iOS/Safari, when a user manually highlights some text, a contextual Copy menu pops up. I was hoping the same menu would pop up when the text is selected programmatically, but it doesn't. Is it even possible to do that? If not, any

问题 What is the prefered way to copy an array of a non-primitve type in Java? How about performance issues? 回答1: The old school way was: public static void java.lang.System.arraycopy(Object src, int srcPos, Object dest, int destPos, int length) This copys from one existing array to another. You have to allocate the new array yourself ... assuming that you are making a copy of an array. From JDK 6 onwards, the java.util.Arrays class has a number of copyOf methods for making copies of arrays, with

问题 I'm trying to copy a file using a hardlink, where the file is stored as a Django FileField. I'd like to use a hardlink to save space and copy time (no changes are expected to be made to the original file or copy). However, I'm getting some odd errors when I try to call new_file.save() from the snippet below. AttributeError: 'file' object has no attribute '_committed' My thinking is that after making the hardlink, I can just open the linked file and store it to the Django new File instance's

问题 Let's say I have this int variable v1 : 1100 1010 And this variable int v2 : 1001 1110 I need to copy the last four bits from v2 to the last four bits of v1 so that the result is: 1100 1110 ^ ^ last four bits of v2 | | first four bits of v1 How would I got about doing this in C or C++? I read a few articles about bitwise operations but I couldn't find any information specifically about this. 回答1: Bitwise operations were the right things to look for. v1 = (v1 & ~0xf) | (v2 & 0xf); Is there

问题 I have csv file that has contents like this: 10,53073,0,0,'Y','2008-05-30 21:46:55',0,'2008-05-30 21:48:04',0,53071,2 I want to load the csv data into my_table. CREATE TABLE my_table ( ad_tree_id numeric(10,0) NOT NULL, node_id numeric(10,0) NOT NULL, ad_client_id numeric(10,0) NOT NULL, ad_org_id numeric(10,0) NOT NULL, isactive character(1) NOT NULL DEFAULT 'Y'::bpchar, created timestamp without time zone NOT NULL DEFAULT now(), createdby numeric(10,0) NOT NULL, updated timestamp without

问题 I have a class A and a class B that inherits class A and extends it with some more fields. Having an object a of type A , how can I create an object b of type B that contains all data that object a contained? I have tried a.MemberwiseClone() but that only gives me another type A object. And I cannot cast A into B since the inheritance relationship only allows the opposite cast. What is the right way to do this? 回答1: There is no means of doing this automatically built into the language... One

问题 In all sorts of programs you can copy hyperlinks to clipboard and paste them into other applications. E g the ’feedback always welcome’ link at the bottom of this page can be copied and pasted into MS Word. I want to create such a link programmatically, copy it to the Clipboard and then be able to paste it somewhere else. For example a link with the text Stack that maps to stackoverflow.com . I’ve tried all sorts of things with Clipboard.SetData but nothing seems to do the trick. (I'm working

问题 I am using Python multiprocessing to generate a temporary output file per process. They can be several GBs in size and I make several tens of these. These temporary files need to be concated to form the desired output and this is the step that is proving to be a bottleneck (and a parallelism killer). Is there a Linux tool that will create the concated file by modifying the file-system meta-data and not actually copy the content ? As long as it works on any Linux system that would be