1. "system()" vs "system_exec()" problem
- Posted by jjnick at cvn.com
Apr 29, 2001
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I am pretty sure that the behavior of "system_exec()" is not desired:
=20
- "testargs.exe" will print a confirmation message that it found 2 =
arguments
- Calling "testargs.exe" with "system_exec()" with the following =
arguments: 'testargs "1 1" "2 2"' produces nothing . . .
- Yet, Calling "testargs.exe" with "system()" with the same arguments =
produces the correct result, "2"
=20
Test it out yourself with the following code:
=20
"TESTARGS.EXW"
include win32lib.ew
without warning
=20
constant Win =3D create( Window, "System calls", =
0, Default, Default, 170, 150, 0 ),
=20
SystemExecButton =3D create( PushButton, "Use system_exec()", =
Win, 10, 10, 140, 40, 0 ),
SystemButton =3D create( PushButton, "Use system()", =
Win, 10, 60, 140, 40, 0 )
=20
sequence OScommand
OScommand =3D "testargs \"1 1\" \"2 2\""
=20
global procedure onClick_SystemExecButton()
object result
result =3D system_exec(OScommand, 0)
result =3D message_box(sprintf( "%s", { "When testargs.exe is passed =
the following: 'testargs \"1 1\" \"2 2\"', nothing happens . . ." } ), =
"Test arguments", MB_ICONINFORMATION+MB_TASKMODAL )
end procedure =20
=20
global procedure onClick_SystemButton()
object result
=20
system (OScommand, 0)
result =3D message_box(sprintf( "%s", { "Yet, when testargs.exe is =
passed the same arguments: 'testargs \"1 1\" \"2 2\"', testargs.exe =
recognizes the 2 arguments" } ),
"Test arguments", MB_ICONINFORMATION+MB_TASKMODAL )
end procedure =20
=20
onClick[SystemExecButton] =3D routine_id( "onClick_SystemExecButton" )
onClick[SystemButton] =3D routine_id( "onClick_SystemButton" )
=20
WinMain( Win, Normal )
"TESTARGS.C"
=20
#include <stdio.h>
#include <stdlib.h>
=20
int main( int argc, char *argv[] ) {
=20
if ( argc =3D=3D 3 ) // argc is always at least "1"
printf("\nFound 2 arguments . . .\n");
getchar();
return( 0 );
}
As all of you know, including double quotes (") on the command line is =
perfectly legal under a DOS box . . .
Obviously, there is something with the way "system_exec()" processes =
double quotes (").
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<DIV><FONT face=3DArial size=3D2>I am pretty sure that the behavior of=20
"system_exec()" is not desired:<BR> <BR>- "<FONT=20
face=3D"Courier New">testargs.exe</FONT>" will print a confirmation =
message that=20
it found 2 arguments<BR>- Calling "<FONT face=3D"Courier =
New">testargs.exe</FONT>"=20
with "<FONT face=3D"Courier New">system_exec()</FONT>" with the =
following=20
arguments: <FONT face=3D"Courier New">'testargs "1 1" "2 2"</FONT>' =
produces=20
nothing . . .<BR>- Yet, Calling "<FONT face=3D"Courier =
New">testargs.exe</FONT>"=20
with "<FONT face=3D"Courier New">system()</FONT>" with the same =
arguments produces=20
the correct result, "2"<BR> <BR>Test it out yourself with the =
following=20
code:<BR> <BR>"TESTARGS.EXW"</FONT></DIV><FONT face=3DArial =
size=3D2>
<DIV><BR><FONT face=3D"Courier New" size=3D1>include =
win32lib.ew<BR>without=20
warning<BR> <BR>constant=20
Win &nbs=
p; =20
=3D create( Window, "System=20
calls", 0, Default, Default, =
170, 150,=20
0 ),<BR> <BR> =20
SystemExecButton =3D create( PushButton, "Use system_exec()",=20
Win, 10, 10, =
140, 40, 0 ),<BR> =20
SystemButton =3D create( PushButton, "Use=20
system()", =
Win, =20
10, 60, 140, 40, 0 =
)<BR> <BR>sequence=20
OScommand<BR>OScommand =3D "testargs \"1 1\" \"2 =
2\""<BR> <BR>global=20
procedure onClick_SystemExecButton()<BR> object =
result<BR> result =3D=20
system_exec(OScommand, 0)<BR> result =3D message_box(sprintf( "%s", =
{ "When=20
testargs.exe is passed the following: 'testargs \"1 1\" \"2 2\"', =
nothing=20
happens . . ." } ), "Test arguments", MB_ICONINFORMATION+MB_TASKMODAL =
)<BR>end=20
procedure &nbs=
p;  =
; =
=20
<BR> <BR>global procedure onClick_SystemButton()<BR> object=20
result<BR> <BR> system (OScommand, 0)<BR> result =3D=20
message_box(sprintf( "%s", { "Yet, when testargs.exe is passed the same=20
arguments: 'testargs \"1 1\" \"2 2\"', testargs.exe recognizes the 2 =
arguments"=20
} ),<BR> "Test arguments", MB_ICONINFORMATION+MB_TASKMODAL =
)<BR>end=20
procedure &nbs=
p;  =
; =
=20
<BR> <BR>onClick[SystemExecButton] =3D routine_id( =
"onClick_SystemExecButton"=20
)<BR>onClick[SystemButton] =3D routine_id(=20
"onClick_SystemButton" )<BR> <BR>WinMain( Win, Normal =
)</FONT></DIV>
<DIV><FONT face=3D"Courier New" size=3D1><BR><FONT face=3DArial=20
size=3D2>"TESTARGS.C"<BR></FONT> <BR>#include =
<stdio.h><BR>#include=20
<stdlib.h><BR> <BR>int main( int argc, char *argv[] )=20
{<BR> <BR> if ( argc =3D=3D 3 ) // argc is always at least=20
"1"<BR> printf("\nFound 2 arguments . . =
.\n");<BR> =20
getchar();<BR> return( 0 );<BR>}</FONT></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>As all of you know, including double =
quotes (") on=20
the command line is perfectly legal under a DOS box . . .</DIV>
<DIV><BR>Obviously, there is something with the way "<FONT=20
face=3D"Courier New">system_exec()</FONT>" processes double quotes=20
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2. Re: "system()" vs "system_exec()" problem
- Posted by jjnick at cvn.com
Apr 29, 2001
This is a multi-part message in MIME format.
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charset="Windows-1252"
I need to expound upon this. I need to pass arguments to my c program =
that contain paths with spaces in them, ie, "C:\My Documents\hello.html" =
. . . hence the reason for the double quotes (") . . .
----- Original Message -----=20
From: jjnick at cvn.com=20
To: EUforum=20
Sent: Sunday, April 29, 2001 10:32 AM
Subject: "system()" vs "system_exec()" problem
I am pretty sure that the behavior of "system_exec()" is not desired: - =
"testargs.exe" will print a confirmation message that it found 2 =
arguments- Calling "testargs.exe" with "system_exec()" with the =
following arguments: 'testargs "1 1" "2 2"' produces nothing . . .- Yet, =
Calling "testargs.exe" with "system()" with the same arguments produces =
the correct result, "2"
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Content-Type: text/html;
charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dwindows-1252">
<META content=3D"MSHTML 5.50.4134.600" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>I need to expound upon this. I =
need to pass=20
arguments to my c program that contain paths with spaces in them, ie, =
"C:\My=20
Documents\hello.html" . . . hence the reason for the double quotes (") . =
.=20
.</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Djjnick at cvn.com =
href=3D"mailto:jjnick at cvn.com">jjnick at cvn.com</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3DEUforum at topica.com=20
href=3D"mailto:EUforum at topica.com">EUforum</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, April 29, 2001 =
10:32=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> "system()" vs =
"system_exec()"=20
problem</DIV>
<DIV><FONT face=3DArial size=3D2></FONT><FONT face=3DArial =
size=3D2></FONT><FONT=20
face=3DArial size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT =
face=3DArial=20
size=3D2></FONT><FONT face=3DArial size=3D2></FONT><FONT face=3DArial=20
size=3D2></FONT><BR></DIV><PRE> >>>>> The =
Euphoria Mailing List <<<<<
</PRE><PRE><FONT face=3DArial size=3D2>I am pretty sure that the =
behavior of "system_exec()" is not desired:<BR> <BR>- "<FONT =
face=3D"Courier New">testargs.exe</FONT>" will print a confirmation =
message that it found 2 arguments<BR>- Calling "<FONT face=3D"Courier =
New">testargs.exe</FONT>" with "<FONT face=3D"Courier =
New">system_exec()</FONT>" with the following arguments: <FONT =
face=3D"Courier New">'testargs "1 1" "2 2"</FONT>' produces nothing . . =
.<BR>- Yet, Calling "<FONT face=3D"Courier New">testargs.exe</FONT>" =
with "<FONT face=3D"Courier New">system()</FONT>" with the same =
arguments produces the correct result, =
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3. Re: "system()" vs "system_exec()" problem
Hi "jjnick",
instead of the system() and system_exec() functions, you can use the
win32lib functions.
try out...
atom rc
sequence startdir
startdir = "C:\\whatever"
rc = shellExecuteEx( "open", "testargs", "\"1 1\" \"2 \"",
startdir, SW_SHOWNORMAL, 0)
------
Derek Parnell
Melbourne, Australia
"To finish a job quickly, go slower."
4. Re: "system()" vs "system_exec()" problem
- Posted by jjnick at cvn.com
Apr 29, 2001
Thanks, but isn't this a problem with "system_exec()", ie, shouldn't it
support these type of arguments, or am I doing something wrong?
What if somebody trys doing this in MS-DOS mode, ie, not in Windows . . .
----- Original Message -----
From: "Derek Parnell" <ddparnell at bigpond.com>
To: "EUforum" <EUforum at topica.com>
Subject: Re: "system()" vs "system_exec()" problem
> instead of the system() and system_exec() functions, you can use the
> win32lib functions.
>
> try out...
> atom rc
> sequence startdir
>
> startdir = "C:\\whatever"
>
> rc = shellExecuteEx( "open", "testargs", "\"1 1\" \"2 \"",
> startdir, SW_SHOWNORMAL, 0)
> ------
> Derek Parnell
> Melbourne, Australia
> "To finish a job quickly, go slower."
