int
tid =
1122
;
std::
string
path =
"
1.txt
"
;
std::
string
s_val =
"
/proc/
"
+ std::to_string(tid) +
"
/comm
"
;
std::ofstream
out
(path.c_str());
if
(!
out
) {
cout
<<
"
error
"
<<
endl;
return
-
1
;
out
.write(s_val.c_str(), s_val.length());
out
.close();
return
0
;
int
std_ifstream_test(
void
) {
std::
string
line;
char
*buf =
new
char
[
64
];
strcpy(buf, FILE_PATH);
std::ifstream
in
(buf);
if
(!
in
) {
cout
<<
"
error
"
<<
endl;
delete
[]buf;
return
-
1
;
getline(
in
, line);
cout
<< line <<
endl;
in
.close();
delete
[]buf;
return
0
;
int
main()
std_ofstream_test();
std_ifstream_test();
return
0
;
$ g++ -std=c++11 file_write.cpp -o pp
$ ./pp
/proc/1122/comm
$ cat 1.txt
/proc/1122/comm
优秀博文：
如何使用c++中file stream：https://www.jianshu.com/p/e9fdc4cd3e0f
