How to set the modification time of a file programmatically? - c

Question

How do I set the modification time of a file programmatically in Windows?

Answer 1

From: http://rosettacode.org/wiki/File/Modification_Time#C
#include <time.h>
#include <utime.h>
#include <sys/stat.h>
const char *filename = "input.txt";
int main() {
struct stat foo;
time_t mtime;
struct utimbuf new_times;
stat(filename, &foo);
mtime = foo.st_mtime; /* seconds since the epoch */
new_times.actime = foo.st_atime; /* keep atime unchanged */
new_times.modtime = time(NULL); /* set mtime to current time */
utime(filename, &new_times);
return 0;
}

Answer 2

Windows (or the standard CRT, anyhow) has the same utimes family of functions that UNIX has.
struct _utimebuf t;
t.tma = 1265140799; // party like it's 1999
t.tmm = 1265140799;
_utime(fn, &t);
Using Win32 functions, FILE_BASIC_INFO can be set using SetFileInformationByHandle.
FILE_BASIC_INFO b;
b.CreationTime.QuadPart = 1265140799;
b.LastAccessTime.QuadPart = 1265140799;
b.LastWriteTime.QuadPart = 1265140799;
b.ChangeTime.QuadPart = 1265140799;
b.FileAttributes = GetFileAttributes(fn);
SetFileInformationByHandle(h, FileBasicInfo, &b, sizeof(b));

Answer 3

Use SetFileInformationByHandle with FileInformationType as FILE_BASIC_INFO

Answer 4

I found this to be useful on windows SetFileTime()

Answer 5

See http://msdn.microsoft.com/en-us/library/aa365539%28VS.85%29.aspx

Answer 6

Here is the solution for Darwin.
All security removed.
#include <sys/stat.h>
#include <sys/time.h>
// params
char *path = "a path to a dir, a file or a symlink";
long int modDate = 1199149200;
bool followLink = false;
// body
struct stat currentTimes;
struct timeval newTimes[2];
stat(path, &currentTimes);
newTimes[0].tv_sec = currentTimes.st_atimespec.tv_sec;
newTimes[0].tv_usec = (__darwin_suseconds_t)0;
newTimes[1].tv_sec = modDate;
newTimes[1].tv_usec = (__darwin_suseconds_t)0;
if (followLnk) {
utimes(path, (const struct timeval *)&newTimes);
} else {
lutimes(path, (const struct timeval *)&newTimes);
}