file-io

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: What is the Fastest Method for High Performance Sequential File I/O in C++? I have looked around a little bit and I am still not sure of the answer to this question. When reading from a text file with an arbitrary word on every line, what would be the absolute fastest way of reading the words from that file? The scope of the project requires the fastest possible file read. Using Visual Studio on Windows 7. No

问题 Consider having a file test.txt with some random text in it. Now we run the following code: f = open('test.txt', 'r') f.read() Now we append data onto test.txt from some other process. Is there some way without reopening f that we can read the new data? This question is limited to Python, it is just short amount of code needed to get the point across. Edit: I have tried everything I know (flushing, reading, seeking, etc) but that doesn't seem to update anything. Edit: Since it seems that

问题 I'm working on a web application that needs to have a link which opens a documents folder from a file server. The folder can be opened either in a new browser tab or new window, or using the computer's default file browser program (i.e. Windows Explorer). This javascript should do the trick: window.open('file://///fileserver.companyname/public/Documents/','_blank); and this html should also work: <a href="file://///fileserver.companyname/public/Documents/">Open Documents</a> but these both

问题 I'm working on a web application that needs to have a link which opens a documents folder from a file server. The folder can be opened either in a new browser tab or new window, or using the computer's default file browser program (i.e. Windows Explorer). This javascript should do the trick: window.open('file://///fileserver.companyname/public/Documents/','_blank); and this html should also work: <a href="file://///fileserver.companyname/public/Documents/">Open Documents</a> but these both

问题 Is it possible to create a text file using C/C++ calls in iOS? Is it then possible to open and read the file from outside the application? That is, application A creates a text file somewhere it has permissions to write to and application B then reads from it. Or, forget application B, can I just open it and read? 回答1: Yes. Use NSFileHandle to get read/write access to files and NSFileManager to create directories and list their contents and do all other sorts of file system access. Just keep

问题 Is it possible to create a text file using C/C++ calls in iOS? Is it then possible to open and read the file from outside the application? That is, application A creates a text file somewhere it has permissions to write to and application B then reads from it. Or, forget application B, can I just open it and read? 回答1: Yes. Use NSFileHandle to get read/write access to files and NSFileManager to create directories and list their contents and do all other sorts of file system access. Just keep

问题 Once I had the theory that on modern operating systems multithreaded read access on the HDD should perform better. I thought that: the operating system queues all read requests, and rearranges them in such a way, that it could read from the HDD more sequentially. The more requests it would get, the better it could rearrange them to optimize the read sequence. I was very sure that I read it somewhere few times. But I did some benchmarking, and had to find out, that multithreaded read access

问题 Once I had the theory that on modern operating systems multithreaded read access on the HDD should perform better. I thought that: the operating system queues all read requests, and rearranges them in such a way, that it could read from the HDD more sequentially. The more requests it would get, the better it could rearrange them to optimize the read sequence. I was very sure that I read it somewhere few times. But I did some benchmarking, and had to find out, that multithreaded read access

问题 I have a piece of code that works well on many servers. It is used to download a file through the readfile php function. But in one particular server it does not work for files bigger than 25mb. Here is the code : $sysfile = '/var/www/html/myfile'; if(file_exists($sysfile)) { header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename="mytitle"'); header('Content-Transfer-Encoding: binary'); header('Expires:

问题 I have a piece of code that works well on many servers. It is used to download a file through the readfile php function. But in one particular server it does not work for files bigger than 25mb. Here is the code : $sysfile = '/var/www/html/myfile'; if(file_exists($sysfile)) { header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename="mytitle"'); header('Content-Transfer-Encoding: binary'); header('Expires: