get the return value of a program

How can I get the return value of a program that I launched from my program?

How are you calling the program from within a program?

popen(), system(), fork()/exec() ?

http://faq.cprogramming.com/cgi-bin/...&id=1043284392
Which of these are you using to run your sub-program?

echo %errorlevel%

CreateProcess().

I dunno, something imaginative like reading the manual page for CreateProcess(), which has a handy "see also" section.
Obviously, this is the place to look for related functions, and gosh, there it is.
http://msdn.microsoft.com/library/de...odeprocess.asp

Code:

---

BOOL WINAPI GetExitCodeProcess(
  HANDLE hProcess,
  LPDWORD lpExitCode
);

---

Does this mean that

Code:

---

DWORD main()

---

is proper and valid too?


Also, what happens when I try to get the exit code on a

Code:

---

void main()

---

program?

Thanks for link :), kinda stupid question thought I suppose, seeing how I have USED THE STUPID FUNC BEFORE! :( (Seeing the function prototype again brought it back.)

Quote:

---

Also, what happens when I try to get the exit code on a

Code:

---

void main()

---

program?

---

Why do you think you're not supposed to use void main()? ;)

Yea, that's what I figured, but still, what would happen? Would the function fail? Or would it just return 0x00000000?

It's undefined!

True, but a really old compiler like turbo C++ or MSVC++6.0 would accept it as being a valid statement. Nowdays, most people put int main ( void )

Is DWORD main(void) valid too?

There is a saying on IRC channels...

TIAS!

(Try it and see!)

Quote:

---

Originally Posted by Dev-C++

5 test.cpp `main' must return `int'

---

Nope.

Why is Win32 sooo... hung up on DWORD!?

> DWORD main()
int main is the portable answer.

It's just that a DWORD is capable of storing all possible integer values on that particular platform. I guess win32 GUI programs which begin with winmain() also return a DWORD as the exit status.

Besides, very few operating system shells can cope with process exit status values which exceed 8 bits, it isn't that much of a deal.

> Also, what happens when I try to get the exit code on a
<clint>Well punk, do you feel lucky</clint>