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Full Discussion: Xlib: XKeysymToKeycode hangs
Top Forums UNIX for Advanced & Expert Users Xlib: XKeysymToKeycode hangs Post 302748199 by N7DR on Monday 24th of December 2012 04:43:13 PM
Old 12-24-2012
Xlib: XKeysymToKeycode hangs

Two simple questions related to the following puzzling behaviour:

I have the following line of code:

Code:
   const KeyCode kc = XKeysymToKeycode(_display_p, ks);

where _display_p is a valid Display* returned from XOpenDisplay() and ks has the value 103 (which was returned by XStringToKeysym(), and corresponds to 'g').

The above line of code hangs indefinitely; I have to kill the job manually.

Question #1: why is this happening? I can't see anything in any documentation that suggests that XKeysymToKeycode() can ever fail to return.

Question #2: how do I stop the call from hanging?
 

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ppmtosixel(1)                                                 General Commands Manual                                                ppmtosixel(1)

NAME
ppmtosixel - convert a portable pixmap into DEC sixel format SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC LJ250 color inkjet printer. If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file. OPTIONS
-raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com- pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni- tude larger than a compressed file and prints much slower. -margin If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci- fied, a 1.5 inch left margin will offset the image. PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?. BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation. SEE ALSO
ppm(5) AUTHOR
Copyright (C) 1991 by Rick Vinci. 26 April 1991 ppmtosixel(1)
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