[英]Getting the last modified date of a file in C
I want to get the last modified date of a file in C. Almost all sources I found use something along this snippet: 我想在C中获取文件的最后修改日期。几乎所有我发现的源都使用了这个代码段:
char *get_last_modified(char *file) {
struct tm *clock;
struct stat attr;
stat(file, &attr);
clock = gmtime(&(attr.st_mtime));
return asctime(clock);
}
But the attr
doesn't even have a field st_mtime
, only st_mtimespec
. 但是
attr
甚至没有字段st_mtime
,只有st_mtimespec
。 Yet, when using this my Eclipse tells me that passing argument 1 of 'gmtime' from incompatible pointer type
on the line clock = gmtime(&(attr.st_mtimespec));
然而,当使用这个时,我的Eclipse告诉我在行
clock = gmtime(&(attr.st_mtimespec));
上passing argument 1 of 'gmtime' from incompatible pointer type
clock = gmtime(&(attr.st_mtimespec));
What am I doing wrong? 我究竟做错了什么?
PS: I'm developing on OSX Snow Leopard, Eclipse CDT and using GCC as Cross-Platform compiler PS:我正在开发OSX Snow Leopard,Eclipse CDT并使用GCC作为跨平台编译器
On OS X, st_mtimespec.tv_sec
is the equivalent of st_mtime
. 在OS X上,
st_mtimespec.tv_sec
等效于st_mtime
。
To make this portable, do 为了使这个便携,做
#ifdef __APPLE__
#ifndef st_mtime
#define st_mtime st_mtimespec.tv_sec
#endif
#endif
and then use st_mtime
. 然后使用
st_mtime
。
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