filesize

how can i show the size of files in /proc? it should not be size zero

由 ≯℡__Kan透↙ 提交于 2019-11-26 10:57:05
from the following message, we know that there are two characters in file /proc/sys/net/ipv4/ip_forward, but why ls just showed this file is of size zero? i know this is not a file on disk, but a file in the memory, so is there any command which i can see the real size of the files in /proc? root@OpenWrt:/proc/sys/net/ipv4# cat ip_forward | wc -c 2 root@OpenWrt:/proc/sys/net/ipv4# ls -l ip_forward -rw-r--r-- 1 root root 0 Sep 3 00:20 ip_forward root@OpenWrt:/proc/sys/net/ipv4# pwd /proc/sys/net/ipv4 Those are not really files on disk (as you mention) but they are also not files in memory - the

s3 direct upload restricting file size and type

由 无人久伴 提交于 2019-11-26 10:51:41
问题 A newbie question but I have googled abit and can\'t seem to find any solution. I want to allow users to directly upload files to S3, not via my server first. By doing so, is there any way the files can be checked for size limit and permitted types before actually uploading to S3? Preferably not to use flash but javascript. 回答1: If you are talking about security problem (people uploading huge file to your bucket), yes, You CAN restrict file size with browser-based upload to S3. Here is an

java get file size efficiently

由 半世苍凉 提交于 2019-11-26 10:17:35
While googling, I see that using java.io.File#length() can be slow. FileChannel has a size() method that is available as well. Is there an efficient way in java to get the file size? GHad Well, I tried to measure it up with the code below: For runs = 1 and iterations = 1 the URL method is fastest most times followed by channel. I run this with some pause fresh about 10 times. So for one time access, using the URL is the fastest way I can think of: LENGTH sum: 10626, per Iteration: 10626.0 CHANNEL sum: 5535, per Iteration: 5535.0 URL sum: 660, per Iteration: 660.0 For runs = 5 and iterations =

PHP filesize MB/KB conversion

由 北城余情 提交于 2019-11-26 07:53:07
问题 How can I convert the output of PHP\'s filesize() function to a nice format with MegaBytes, KiloBytes etc? like: if the size is less than 1 MB, show the size in KB if it\'s between 1 MB - 1 GB show it in MB if it\'s larger - in GB 回答1: Here is a sample: <?php // Snippet from PHP Share: http://www.phpshare.org function formatSizeUnits($bytes) { if ($bytes >= 1073741824) { $bytes = number_format($bytes / 1073741824, 2) . ' GB'; } elseif ($bytes >= 1048576) { $bytes = number_format($bytes /

How do you get the file size in C#?

由 核能气质少年 提交于 2019-11-26 06:35:12
问题 I need a way to get the size of a file using C#, and not the size on disk. How is this possible? Currently I have this loop foreach (FileInfo file in downloadedMessageInfo.GetFiles()) { //file.Length (will this work) } Will this return the size or the size on disk? 回答1: FileInfo.Length will return the length of file, in bytes (not size on disk), so this is what you are looking for, I think. 回答2: If you have already a file path as input, this is the code you need: long length = new System.IO

Using C++ filestreams (fstream), how can you determine the size of a file? [duplicate]

由 こ雲淡風輕ζ 提交于 2019-11-26 06:29:57
问题 This question already has answers here : How can I get a file's size in C++? [duplicate] (7 answers) Closed 2 years ago . I\'m sure I\'ve just missed this in the manual, but how do you determine the size of a file (in bytes) using C++\'s istream class from the fstream header? 回答1: You can open the file using the ios::ate flag (and ios::binary flag), so the tellg() function will give you directly the file size: ifstream file( "example.txt", ios::binary | ios::ate); return file.tellg(); 回答2:

Reusable library to get human readable version of file size?

由 白昼怎懂夜的黑 提交于 2019-11-26 06:04:22
问题 There are various snippets on the web that would give you a function to return human readable size from bytes size: >>> human_readable(2048) \'2 kilobytes\' >>> But is there a Python library that provides this? 回答1: Addressing the above "too small a task to require a library" issue by a straightforward implementation: def sizeof_fmt(num, suffix='B'): for unit in ['','Ki','Mi','Gi','Ti','Pi','Ei','Zi']: if abs(num) < 1024.0: return "%3.1f%s%s" % (num, unit, suffix) num /= 1024.0 return "%.1f%s

Check file size before upload

由 时光毁灭记忆、已成空白 提交于 2019-11-26 05:25:59
问题 I am using this javascript that I got from here, and it works perfectly for what I need it to. var _validFileExtensions = [\".jpg\", \".jpeg\"]; function File_Validator(theForm){ var arrInputs = theForm.getElementsByTagName(\"input\"); for (var i = 0; i < arrInputs.length; i++) { var oInput = arrInputs[i]; if (oInput.type == \"file\") { var sFileName = oInput.value; var blnValid = false; for (var j = 0; j < _validFileExtensions.length; j++) { var sCurExtension = _validFileExtensions[j]; if

how can i show the size of files in /proc? it should not be size zero

由 家住魔仙堡 提交于 2019-11-26 03:28:45
问题 from the following message, we know that there are two characters in file /proc/sys/net/ipv4/ip_forward, but why ls just showed this file is of size zero? i know this is not a file on disk, but a file in the memory, so is there any command which i can see the real size of the files in /proc? root@OpenWrt:/proc/sys/net/ipv4# cat ip_forward | wc -c 2 root@OpenWrt:/proc/sys/net/ipv4# ls -l ip_forward -rw-r--r-- 1 root root 0 Sep 3 00:20 ip_forward root@OpenWrt:/proc/sys/net/ipv4# pwd /proc/sys

Get file size before uploading

由 纵然是瞬间 提交于 2019-11-25 23:54:29
问题 Is there any way to find out the file size before uploading the file using AJAX / PHP in change event of input file? 回答1: For the HTML bellow <input type="file" id="myFile" /> try the following: //binds to onchange event of your input field $('#myFile').bind('change', function() { //this.files[0].size gets the size of your file. alert(this.files[0].size); }); See following thread: How to check file input size with jQuery? 回答2: <script type="text/javascript"> function AlertFilesize(){ if
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