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windows system call

richardb_p
richardb_p asked
on
Medium Priority
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Last Modified: 2010-08-05
hello,

in my program I go system("some other program");
This works fine on Linux but on Windows a dialog box appears while it executes. What can I do to stop this appearing while remaining cross platform?

thanks
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Commented:
Use CreateProcess function.

Author

Commented:
how is that cross platform?

Commented:
Use the "start" command, it has an option for hiding the window.

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Top Expert 2012
Commented:
>>how is that cross platform?

Like that:

DWORD ExecuteAndWaitForCompletion   (   char*   pszCmd)
{
#ifdef WIN32 // Windows, use 'CreateProcess()'

   STARTUPINFO         si;
   PROCESS_INFORMATION pi;

   BOOL                bRes;

   DWORD               dwCode  =   0;

   ZeroMemory  (   &si,    sizeof  (   STARTUPINFO));

   si.cb           =   sizeof  (   STARTUPINFO);
   si.dwFlags      =   STARTF_USESHOWWINDOW;
   si.wShowWindow  =   SW_HIDE;

   bRes    =   CreateProcess   (   NULL,
                                   pszCmd,
                                   NULL,
                                   NULL,
                                   TRUE,
                                   NORMAL_PRIORITY_CLASS,
                                   NULL,
                                   NULL,
                                   &si,
                                   &pi
                               );

   WaitForSingleObject (   pihProcess, INFINITE);

   GetExitCodeProcess  (   pi.hProcess,    &dwCode);

   CloseHandle (   pi.hProcess);
   CloseHandle (   pi.hThread);

   return  (   dwCode);

#else

   return system ( pszCmd); // not Windows, use 'system()'

#endif
}

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Ask the Experts

Author

Commented:
grg99: where can I find information on the start command?

jkr: thanks, that will be my last resort. But system calls are pretty standard functionality so is there some kind of wrapper to do this?

I was expecting there would be a way to just disable/hide the terminal on windows so I could still use system(). I can get rid of the default console by compiling with -mwindows.
jkr
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Top Expert 2012

Commented:
>>But system calls are pretty standard functionality

... with all the side effects. 'system()'. IMO not a good idea to rely on it, since there is no guaranteed integration in the OS. I'd always use it as a last resort, even on UN*X there are APIs that I'd way prefer over 'system()'.

Author

Commented:
yeah I don't feel comfortable either, unfortuantely not my choice. I have to execute a compiled program (contents unknown to me) with different argument combinations and halt while it executes. This is fine on Debian and Solaris but Windows flashes that damn terminal. I'll give you the points jkr unless something comes up quickly.
jkr
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Top Expert 2012

Commented:
>>I have to execute a compiled program (contents unknown to me) with different argument combinations and
>>halt while it executes.

That's excactly what 'ExecuteAndWaitForCompletion()' does.

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