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Re^2: Perl/Tk System Function Error

by afoken (Abbot)
on Nov 18, 2011 at 10:20 UTC ( #938771=note: print w/replies, xml ) Need Help??


in reply to Re: Perl/Tk System Function Error
in thread Perl/Tk System Function Error

removing the double-quotes makes it run [...] Not sure why

Simple: The first argument of the start command, when put in double quotes, is taken as the requested window title. If you need to quote the command to be started, you also need to provide a dummy window title, i.e.:

system('start "" "C:\\program files\\my application\\kaboom.exe" /foo +/bar');

Also note that system() has a special case on Windows to run a program (with arguments) without waiting for it, and without having to mess with any shell or the braindead start program. This is documented in perlport:

system(1,'C:\\program files\\my application\\kaboom.exe','/foo','/bar' +); # ^-- the 1 is the special case for Windows

Alexander

--
Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)

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[shmem]: well finally.
[stevieb]: nice! I just finished a GPS "take me home" device last week, and did a bunch of software updates to it yesterday. I also created a pseudo chip with an Arduino to simulate an IC, where it responds to register read/writes over the I2C bus...
[stevieb]: ...from an I2C master. It's ugly and there are many changes I'm going to make, but I had not done anything like it before. It's designed for my RPi:: automated test platform; a system that does CI on *all* my RPi modules.
[shmem]: pseudo chip?
[stevieb]: well, what happens is the Arduino 'listens' for requests r/w, and does the appropriate thing when it's interrupted based on the 'register' address sent in. It's ugly as it was my first attempt, but I've got great new ideas I'm just sitting.
[stevieb]: ...down to implement now. Here's the sketch as it currently sits
[shmem]: well I use I2C and SPI and stuff, but creating a pseudo chip looks to me like lot of indirection and memory clutter... not?
[choroba]: Are you going to use the device soon? Related to your comment about "not having much time to do a lot of coding"...
[stevieb]: sure, but I'm just learning ;) I consider it practice to get a good understanding of what goes on *after* an I2C/SPI request is made
[shmem]: ah ok. Gonna read that. but now....

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