copy

问题 I need to copy some big file (6 GB) via PHP. How can I do that? The Copy() function can't do it. I am using PHP 5.3 on Windows 32/64. 回答1: This should do it. function chunked_copy($from, $to) { # 1 meg at a time, you can adjust this. $buffer_size = 1048576; $ret = 0; $fin = fopen($from, "rb"); $fout = fopen($to, "w"); while(!feof($fin)) { $ret += fwrite($fout, fread($fin, $buffer_size)); } fclose($fin); fclose($fout); return $ret; # return number of bytes written } 回答2: If copy doesnt work,

问题 What is the difference between copy and retain for NSString ? - (void)setString:(NSString*)newString { string = [newString copy]; } 回答1: In a general setting, retaining an object will increase its retain count by one. This will help keep the object in memory and prevent it from being blown away. What this means is that if you only hold a retained version of it, you share that copy with whomever passed it to you. Copying an object, however you do it, should create another object with duplicate

问题 Is it possible to copy a folder present in sdcard to another folder present the same sdcard programmatically ?? If so, how to do that? 回答1: An improved version of that example: // If targetLocation does not exist, it will be created. public void copyDirectory(File sourceLocation , File targetLocation) throws IOException { if (sourceLocation.isDirectory()) { if (!targetLocation.exists() && !targetLocation.mkdirs()) { throw new IOException("Cannot create dir " + targetLocation.getAbsolutePath()

问题 I need to copy some records from our SQLServer 2005 test server to our live server. It's a flat lookup table, so no foreign keys or other referential integrity to worry about. I could key-in the records again on the live server, but this is tiresome. I could export the test server records and table data in its entirety into an SQL script and run that, but I don't want to overwrite the records present on the live system, only add to them. How can I select just the records I want and get them

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: Best way to copy the entire contents of a directory in C# I'd like to copy folder with all its subfolders and file from one location to another in .NET. What's the best way to do this? I see the Copy method on the System.IO.File class, but was wondering whether there was an easier, better, or faster way than to crawl the directory tree. 回答1: Well, there's the VisualBasic.dll implementation that Steve references,

问题 I am trying to access the copy, cut, and paste methods of a NSTextField instance in its window delegate so I can customize these methods. I find that unlike tableViews and textViews, the textfield's copy, paste and cut actions are not responsive in the delegate. My understanding is that all text controls share the window's field editor yet this does not seem to be the case. I thought perhaps the TextField's field editor was not being shared with the window delegate, however I did some testing

问题 I have a class Particle which has some parameters and attributes, as you can see below. But, when it does get to the function setter for position, and it executes the copy() function, I get the error message : RuntimeError: maximum recursion depth exceeded while calling a Python object . I've tried different options, like deepcopy() , or import sys sys.setrecursionlimit(10000) , but none of them worked... Does anyone have any idea? This is my code: def initCost(n): a = random.randint(0,10)

问题 I am a little confused about object assignment and pointers in Ruby, and coded up this snippet to test my assumptions. class Foo attr_accessor :one, :two def initialize(one, two) @one = one @two = two end end bar = Foo.new(1, 2) beans = bar puts bar puts beans beans.one = 2 puts bar puts beans puts beans.one puts bar.one I had assumed that when I assigned bar to beans, it would create a copy of the object, and modifying one would not affect the other. Alas, the output shows otherwise. ^_^

问题 what should I use when I want to copy src_str to dst_arr and why? char dst_arr[10]; char *src_str = "hello"; PS: my head is spinning faster than the disk of my computer after reading a lot of things on how good or bad is strncpy and strlcpy . Note: I know strlcpy is not available everywhere. That is not the concern here. 回答1: strncpy is never the right answer when your destination string is zero-terminated. strncpy is a function intended to be used with non-terminated fixed-width strings.

问题 I am looking for someone to assist in the code i require in my application to copya image from where they get stored on the HTC desire as standard(the gallery) to a another folder on the SD card. I want the user to be able to click on a button and a certain file is copied from the SD card gallery folder to the another folder on the SD card? Thanks 回答1: Usmaan, You can launch the gallery picker intent with the following: public void imageFromGallery() { Intent getImageFromGalleryIntent = new