SEARCH KEYWORD -- file write
My frequently used Linux commands
In our day to day work. We may have many chances working on Linux/Unix systems. There are many things we may need to do, checking logs, navigating in directories, creating file or installing software. We may use many commands to complete the work, such as ls, mkdir, cd etc. Below are my frequently used Linux commands or programs recently: pwd : print working directory, sometimes I need to check which working directory I am in in order to know where to go next. ls : List current directory files,...
Output a file with HTTP range header in PHP
When downloading a large file, we may encounter some network issues which causes download termination and only part of the file is downloaded. When the network connection resumes next time, we may need to redownload the file again from the beginning. In order to save bandwidth, http provides a Range parameter in its header which can control the file transfer flow. With the range parameter in the header, we can resume the download from where we stop. Here is a piece of PHP code snippet which uses...
PHP, range,http, file transfer 2013-01-09 05:55:05
Can we believe our eyes?
Several days ago, one of our customers submitted a sample (SHA1: fbe71968d4c5399c2906b56d9feadf19a35beb97, detected as TrojanDropper:Win32/Vundo.L). This trojan hijacks the hosts “vk.com†and “vkontakte.ru†(both social networking sites in Russia)and redirects them to 92.38.209.252, but achieves this in an unusual way. A common method used to hijack a website and redirect it to a site of the attacker’s choice is to add an entry in the Windows hosts f...
The most stupid C bug ever
I have been programming for a number of years already. I have seen others introduce bugs, and I have also introduced (and solved!) many bugs while coding. Off-by-one, buffer-overflow, treating pointers as pointees, different behaviors or the same function (this is specially true for cross-platform applications), race conditions, deadlocks, threading issues. I think I have seen quite a few of the typical issues. Yet recently I lost a lot of time to what I would call the most stupid C bug in my ca...
The most stupid C bug ever
I have been programming for a number of years already. I have seen others introduce bugs, and I have also introduced (and solved!) many bugs while coding. Off-by-one, buffer-overflow, treating pointers as pointees, different behaviors or the same function (this is specially true for cross-platform applications), race conditions, deadlocks, threading issues. I think I have seen quite a few of the typical issues. Yet recently I lost a lot of time to what I would call the most stupid C bug in ...
C,Bug,Comment,Back slash 2012-04-22 03:40:49
Recover deleted file in Linux EXT3 file system
Environment : CentOS 5.3 x86_64, /dev/sdb1 is the data segment /data0. EXT3 file system. Problem : /data0/tcsql/cankao/phpcws-1.5.0/httpcws.cpp is deleted mistakenly and httpcws.cpp is not backed up. It will take much time to rewrite this program again. So we must recover it back. debugfs is feasible in EXT2 file system, but in EXT3 file system, it's not very useful. There is one open source software called ext3grep which can help us recover deleted file in EXT3 file system. The recovery steps a...
Linux,EXT3,File recovery 2013-08-16 07:06:45
Buffcacher
What should a ‘cache’ be? It means a lot of things, but to my mind the default programming type should be: “keep around expensive-to-generate bits of read-only data in case we need them again, or until the computer really needs that RAM for something else†I was writing a custom video editing program in Python (interesting choice of language for that problem) and I wanted to cache decoded frames; but I just wasn’t happy with the memory management of explici...
Buffer,Cache,Web browser,Memory,RAM 2012-02-24 05:10:10
Latest : Asp.Net 5 Beta 7 Is Now Available
Asp.net developers can now use the latest update asp.net 5 Beta 7 on both NuGet and Visual Studio 2015 to make good asp.net development practices. The update also has the first public preview of .Net Execution Environment for Linux and Mac without any need of Mono. To know how to use asp.net 5 beta 7, read this article further. You need to install the update first to use its features with Visual Studio 2015. You can download and install it from Microsoft’s official site. The update brings ...
ASP.NET 5 BETA 7 2015-09-18 06:33:54
Get associated file icon with only extension name using C++ on Windows
I have searched on Google for a few examples on how to get associated file icon with only file extension name using C++ on Windows. There are some useful information provided on MSDN which explains the use of SHGetFileInfo() function.It also gives an example code, but it doesn't say how to do it with only the extension name. Here I give an example code on how to achieve this after I gathered and summarized some useful information from Internet. I have tested the code on my PC, it w...
File icon,Windows,Association,Extension name,C++ 2012-03-26 09:55:20
Creating Dynamic PDF files using HTML and PHP
There always arise a need for converting content from one file format to another one. Some may need to convert some text into HTML and some may need to convert some HTML content to an image format. The main reason for the need to convert from one file format to another is because the target file format is best suited for targeted medium where the content need to be displayed. The targeted medium may be an email, a printed hard copy or a web browser. The text format is best suited for sending ema...
PHP,HTML,PDF,Conversion,Generate,Library 2011-11-18 12:10:53
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