Hey,

Is it possible to run a command with the system() function without having the program open up a command prompt until it finishes?

Thanks!

okibi wrote:
> Hey,
> 
> Is it possible to run a command with the system() function without having the program open up a command prompt until it finishes?
> 
> Thanks!

I doubt it.. but you can call CreateProcess and prevent the window appearing.  Also there is popen which may prevent it.  Both are more complicated than system but offer more flexibility too.

Regan

Is there documentation somewhere on how these work? Also, will they work on both Windows and Linux?

Thanks!

Regan Heath Wrote:

> okibi wrote:
> > Hey,
> > 
> > Is it possible to run a command with the system() function without having the program open up a command prompt until it finishes?
> > 
> > Thanks!
> 
> I doubt it.. but you can call CreateProcess and prevent the window appearing.  Also there is popen which may prevent it.  Both are more complicated than system but offer more flexibility too.
> 
> Regan

okibi wrote:
> Is there documentation somewhere on how these work? Also, will they work on both Windows and Linux?
> 
> Thanks!
> 
> Regan Heath Wrote:
> 
>> okibi wrote:
>>> Hey,
>>>
>>> Is it possible to run a command with the system() function without having the program open up a command prompt until it finishes?
>>>
>>> Thanks!
>> I doubt it.. but you can call CreateProcess and prevent the window appearing.  Also there is popen which may prevent it.  Both are more complicated than system but offer more flexibility too.
>>
>> Regan
> 

Popen;
http://www.opengroup.org/pubs/online/7908799/xsh/popen.html

You will need to do something like:

extern(C) FILE *popen(const char *command, const char *mode);

in your D source file before you can call it.  See dm\include\stdio.h for the function declaration.  Any function you can find in the dm include directories can be called like this.

I wrote a ProcessStream using CreateProcess etc which worked on both windows and linux (although there may have been a few bugs to deal with):

http://www.digitalmars.com/d/archives/digitalmars/D/learn/internal_error_toObjFile_7911.html

You can find stuff like this by searching the archives here:
http://www.digitalmars.com/d/archives/digitalmars/D/index.html
http://www.digitalmars.com/d/archives/digitalmars/D/learn/index.html
..etc..

Regan

I tried your method for popen and i get "Symbol undefined" errors. I also tried this code:

extern (C) {
	typedef void FILE;
	FILE* popen(char* cmd, char* type);
	int pclose(FILE* stream);
}

and get the same errors.

Any ideas?

Regan Heath Wrote:

> okibi wrote:
> > Is there documentation somewhere on how these work? Also, will they work on both Windows and Linux?
> > 
> > Thanks!
> > 
> > Regan Heath Wrote:
> > 
> >> okibi wrote:
> >>> Hey,
> >>>
> >>> Is it possible to run a command with the system() function without having the program open up a command prompt until it finishes?
> >>>
> >>> Thanks!
> >> I doubt it.. but you can call CreateProcess and prevent the window appearing.  Also there is popen which may prevent it.  Both are more complicated than system but offer more flexibility too.
> >>
> >> Regan
> > 
> 
> Popen; http://www.opengroup.org/pubs/online/7908799/xsh/popen.html
> 
> You will need to do something like:
> 
> extern(C) FILE *popen(const char *command, const char *mode);
> 
> in your D source file before you can call it.  See dm\include\stdio.h for the function declaration.  Any function you can find in the dm include directories can be called like this.
> 
> I wrote a ProcessStream using CreateProcess etc which worked on both windows and linux (although there may have been a few bugs to deal with):
> 
> http://www.digitalmars.com/d/archives/digitalmars/D/learn/internal_error_toObjFile_7911.html
> 
> You can find stuff like this by searching the archives here: http://www.digitalmars.com/d/archives/digitalmars/D/index.html http://www.digitalmars.com/d/archives/digitalmars/D/learn/index.html ..etc..
> 
> Regan

I tried your method for popen and i get "Symbol undefined" errors. I also tried this code:

extern (C) {
	typedef void FILE;
	FILE* popen(char* cmd, char* type);
	int pclose(FILE* stream);
}

and get the same errors.

Any ideas?

Regan Heath Wrote:

> okibi wrote:
> > Is there documentation somewhere on how these work? Also, will they work on both Windows and Linux?
> > 
> > Thanks!
> > 
> > Regan Heath Wrote:
> > 
> >> okibi wrote:
> >>> Hey,
> >>>
> >>> Is it possible to run a command with the system() function without having the program open up a command prompt until it finishes?
> >>>
> >>> Thanks!
> >> I doubt it.. but you can call CreateProcess and prevent the window appearing.  Also there is popen which may prevent it.  Both are more complicated than system but offer more flexibility too.
> >>
> >> Regan
> > 
> 
> Popen; http://www.opengroup.org/pubs/online/7908799/xsh/popen.html
> 
> You will need to do something like:
> 
> extern(C) FILE *popen(const char *command, const char *mode);
> 
> in your D source file before you can call it.  See dm\include\stdio.h for the function declaration.  Any function you can find in the dm include directories can be called like this.
> 
> I wrote a ProcessStream using CreateProcess etc which worked on both windows and linux (although there may have been a few bugs to deal with):
> 
> http://www.digitalmars.com/d/archives/digitalmars/D/learn/internal_error_toObjFile_7911.html
> 
> You can find stuff like this by searching the archives here: http://www.digitalmars.com/d/archives/digitalmars/D/index.html http://www.digitalmars.com/d/archives/digitalmars/D/learn/index.html ..etc..
> 
> Regan

okibi wrote:
> I tried your method for popen and i get "Symbol undefined" errors. I also tried this code:
> 
> extern (C) {
> 	typedef void FILE;
> 	FILE* popen(char* cmd, char* type);
> 	int pclose(FILE* stream);
> }
> 
> and get the same errors.
> 
> Any ideas?

Ahh, I was mistaken;  popen only works on UNIX.  You need to code up something with CreateProcess.  I recall someone else posted a popen implementation for windows once..

http://www.digitalmars.com/pnews/read.php?server=news.digitalmars.com&group=digitalmars.D&artnum=14470

Maybe that will help.

Regan

Does system() (within std.process) not work on linux? I was under the impression that it did.

I'll look into that, thanks!

Regan Heath Wrote:

> okibi wrote:
> > I tried your method for popen and i get "Symbol undefined" errors. I also tried this code:
> > 
> > extern (C) {
> > 	typedef void FILE;
> > 	FILE* popen(char* cmd, char* type);
> > 	int pclose(FILE* stream);
> > }
> > 
> > and get the same errors.
> > 
> > Any ideas?
> 
> Ahh, I was mistaken;  popen only works on UNIX.  You need to code up something with CreateProcess.  I recall someone else posted a popen implementation for windows once..
> 
> http://www.digitalmars.com/pnews/read.php?server=news.digitalmars.com&group=digitalmars.D&artnum=14470
> 
> Maybe that will help.
> 
> Regan