49 lines
1.2 KiB
Groff
49 lines
1.2 KiB
Groff
.TH IM_SYSTEM 3 "7 Mar 2000"
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.SH NAME
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im_system \- run a command on an image
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.SH SYNOPSIS
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#include <vips/vips.h>
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int
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im_system(im, cmd, out)
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.br
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IMAGE *im;
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.br
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const char *cmd;
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.br
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char **out;
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.SH DESCRIPTION
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.B im_system()
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runs a command on an image, returning the command's output as a string. This
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string should be freed with
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.B im_free()
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when you've finished with it.
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The command is executed with the
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.B system(3)
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call; the first '%s' in the command being substituted for a filename.
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For example:
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im_system( im, "vips2dj %s | lpr", &result )
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will run the command vips2dj(1) on the image, piping the result to the
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printer.
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If the IMAGE is a file on disc, then the filename will be the name of the real
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file. If the image is in memory, or the result of a computation, then a new
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file is created in the temporary area called something like "vips_XXXXXX", and
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that filename given to the command. The file is deleted when the command
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finishes.
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The environment variable TMPDIR can be used to set the temporary directory. If
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it is not set, it defaults to "/tmp".
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.SH RETURN VALUE
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The function returns 0 on success and -1 on error.
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.SH SEE ALSO
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system(3), vips2dj(1)
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.SH COPYRIGHT
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2000 The National Gallery and Birkbeck College
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