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Thread View: comp.windows.misc
1 messages
1 total messages Started by MORAGA ORELLANA, CORNELIO Wed, 11 Nov 1992 17:28
Re: problems with a[i][j] within a function
#440
Author: MORAGA ORELLANA, CORNELIO
Date: Wed, 11 Nov 1992 17:28
27 lines
1354 bytes
>     I am a complete novice to X-windows programming (although I know
>C and unix and VMS systems programming at an intermediate level). I
>need to take a 2-dimensional array of colormap indeces, corresponding
>to a rectangular patch of the screen with pixels of different colors,
>and throw it up as a window on a Ultrix VAX or a VMS Vax with
>DecWindows (no MIT X stuff - just regular out-of-the-box DecWindows)
>from a C program. Something like this:
>display_in_window(array) 
                  (array, dim1, dim2)
				  function display_in_windows can't know dim1 and dim2
				  if not it specified.
>short array[X][Y];
>{

>   /* here's the part I'm having trouble with */

	a_ij = array[i][j];  ==> error !!!

	it's better to use (though more complex) 
    a_ij = ((short*)array)[i*dim2+j];   /* this is correct ! */
>}
>
 [  ... ]
>Mike Levin
>
	 cmoraga@dcc.uchile.cl
>
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