c++ - C语言中通过系统调用生成的文件存放在哪里?

Answer 1

sprintf(cmd, "echo '%s %s' >> reports.log", now());

There are obviously two

in the %s format string, but there is only one now() in the following parameter (didn’t your compiler give a warning?). In sprintf(), it is thought that you passed in two strings. When it reads the parameter that does not exist, an access violation occurs. I saw that you still have a comment variable that is not used. Does this mean:

sprintf(cmd, "echo '%s %s' >> reports.log", now(), comment);

As for the created file, it is right next to the compiled EXE file, not necessarily in the source code directory.
Regarding the 系统调用 in the question: My first reaction was open(), and then CreateFile(). This is considered a command line, and it cannot be called 系统调用.