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List:       graphicsmagick-help
Subject:    Re: [GM-help] Generate Image from text containing double quotes
From:       Bob Friesenhahn <bfriesen () simple ! dallas ! tx ! us>
Date:       2014-03-16 20:45:16
Message-ID: alpine.GSO.2.01.1403161534141.1735 () freddy ! simplesystems ! org
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On Fri, 14 Mar 2014, ioannis wrote:

> In order to generate an image from a String, I am using the following
> command:
>
> gm convert -size 300x -background white -pointsize 15 -font Arial
> caption:string text example.jpg
>
> The above command is executed using
> org.gm4java.engine.support.PooledGMService.
> This works fine, unless if I need to print text that contains double
> quotes.
> In Linux/OSX, if text contains double quotes I need to escape them, and
> surround text with double quotes.
> This prints the text correctly, but the surrounding double quotes are
> also printed, and I cannot find a way to stop that. Single quotes inside
> text don't cause problems. Windows does not print the surrounding
> quotes, and requires them anyway, but the code will be mainly be run on
> linux.
>
> Any suggestions about how to solve this problem with quotes?
> ps: I have tried using label instead of caption, but it ignores the
> pointsize set, and instead takes all the available width.

Trying to get the Unix/Windows command shell and argument strings to 
all behave and pass what you want into the program is really hard. 
With some effort, it is possible with a Unix shell but Windows command 
shell only understands double qotes

It does seem to work to put the text into a file and use it by 
reference (via @ prefix on file name).  In this case doubled quotes 
were not required:

~~~~~~~~~~~~~~~~~~~
% cat hi.txt
Hi" There
% gm convert -size 300x -background white -pointsize 15 -font Arial caption:@hi.txt example.jpg
~~~~~~~~~~~~~~~~~~~

Of course this requires a temporary file and you still need to figure 
out how to get your literal text in there.

Using text files by reference under Windows is a good idea since it 
avoids the many weaknesses associated with the Windows command shell 
and command-line length limits.  It is good enough that the Visual 
Studio compiler still works like that to this day.

Bob
-- 
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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