Take a look at the enlightening presentation File Locking Tricks and Traps: This short talk presents several common pitfalls of file locking and a few useful tricks for using file locking more effectively. Edit: To address your questions more precisely: Is there a better synchronization method than the lock file? As @Hasturkun already mentioned and … Read more
This works pretty well for me. Hope I could help import javax.activation.MimetypesFileTypeMap; import java.io.File; class Untitled { public static void main(String[] args) { String filepath = “/the/file/path/image.jpg”; File f = new File(filepath); String mimetype= new MimetypesFileTypeMap().getContentType(f); String type = mimetype.split(“https://stackoverflow.com/”)[0]; if(type.equals(“image”)) System.out.println(“It’s an image”); else System.out.println(“It’s NOT an image”); } }
Use Environment.ExpandEnvironmentVariables on the path before using it. var pathWithEnv = @”%USERPROFILE%\AppData\Local\MyProg\settings.file”; var filePath = Environment.ExpandEnvironmentVariables(pathWithEnv); using(ostream = new FileStream(filePath, FileMode.Open)) { //… }
This “FileSaver” library may help. If you want it to be reasonably cross-browser, you’ll also need this to implement the W3C Blob API in places it’s not already implemented. Both respect namespaces, and are completely framework agnostic, so don’t worry about naming issues. Once you’ve got those included, and as long as you’re only saving … Read more
On windows the CTime is the creation time, use the following: <?php $files = array(); foreach (new DirectoryIterator(‘/path’) as $fileInfo) { $files[$fileInfo->getFileName()] = $fileInfo->getCTime(); } arsort($files); After this $files will contain an array of your filenames as the keys and the ctime as the values. I chose this backwards representation due to the possibility of … Read more
Yes, I think hashing the file would be the best way if you have to compare several files and store hashes for later comparison. As hash can clash, a byte-by-byte comparison may be done depending on the use case. Generally byte-by-byte comparison would be sufficient and efficient, which filecmp module already does + other things … Read more
.pyc contain the compiled bytecode of Python source files. The Python interpreter loads .pyc files before .py files, so if they’re present, it can save some time by not having to re-compile the Python source code. You can get rid of them if you want, but they don’t cause problems, they’re not big, and they … Read more
You can’t append to an existing file created with an ObjectOutputStream, at least not without effort. There is a trick somewhere about extending ObjectOutputStream and overriding the writeStreamHeader() method so as not to write the stream header the second time, but I’m not in favour of it. You should really rewrite the whole file, maybe … Read more
The answer given by FrenchKiss Dev is not correct. The user will still be able to see the “.data” directory in iTunes and save that locally with all the files inside it. Instead, store private documents in Library/Preferences According to Apple: In addition to the directories documented previously, the entire /Library directory has always been … Read more