how to open a file in user's home folder

Question

我想在linux上的用户主目录中放置一种锁文件（来自c ++），但fopen'ing~ / .fluudit似乎不起作用。

fopen("~/.fluudit","w");   //fails

Answer 1

You can use the environment variable HOME and if that's not present, you can use the password database:

#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>

struct passwd *pw = getpwuid(getuid());

const char *homedir = pw->pw_dir;

Answer 2

The expansion of ~ to, say, getenv("HOME") is called globbing and is something you need to do first. You didn't say which libaries or frameworks you are using, but some provide this.