This may not the most efficient or optimized way to do it, but it’s easier to read if you are not familiar with log maths, and should be fast enough for most scenarios. string[] sizes = { “B”, “KB”, “MB”, “GB”, “TB” }; double len = new FileInfo(filename).Length; int order = 0; while (len >= … Read more
#include <fstream> std::ifstream::pos_type filesize(const char* filename) { std::ifstream in(filename, std::ifstream::ate | std::ifstream::binary); return in.tellg(); } See http://www.cplusplus.com/doc/tutorial/files/ for more information on files in C++. edit: this answer is not correct since tellg() does not necessarily return the right value. See http://stackoverflow.com/a/22986486/1835769
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: … Read more
Those are not really files on disk (as you mention) but they are also not files in memory – the names in /proc correspond to calls into the running kernel in the operating system, and the contents are generated on the fly. The system doesn’t know how large the files would be without generating them, … Read more
Addressing the above “too small a task to require a library” issue by a straightforward implementation (using f-strings, so Python 3.6+): def sizeof_fmt(num, suffix=”B”): for unit in [“”, “Ki”, “Mi”, “Gi”, “Ti”, “Pi”, “Ei”, “Zi”]: if abs(num) < 1024.0: return f”{num:3.1f}{unit}{suffix}” num /= 1024.0 return f”{num:.1f}Yi{suffix}” Supports: all currently known binary prefixes negative and positive … Read more
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?
On Unix-like systems, you can use POSIX system calls: stat on a path, or fstat on an already-open file descriptor (POSIX man page, Linux man page). (Get a file descriptor from open(2), or fileno(FILE*) on a stdio stream). Based on NilObject’s code: #include <sys/stat.h> #include <sys/types.h> off_t fsize(const char *filename) { struct stat st; if … Read more