Hi everybody! I am going to write the XCB binding for GNU Smalltalk and now I'm playng with C call-outs.
I've got an issue in the case when C function returns a structure itself (not a pointer). There are two files in attachments: * rootwin.c - the C code that aquires current screen and prints the root window's ID * xcbroot.st - the Smalltalk port of rootwin.c `--> ./rootwin root window 163 `--> gst -f xcbroot.st xcbroot.st:56: Aborted (ip 10)CUInt(CScalar)>>#value (ip 6)UndefinedObject>>#executeStatements (ip 0)<bottom> zsh: abort gst -f xcbroot.st I assume that I missunderstood something about pointer-to-structure conversions, however I wrote this code according to GST manual (C data types, etc). I think I did something wrong. Could anybody please help me with this problem?
#include <stdio.h>
#include <unistd.h> /* pause() */
#include <xcb/xcb.h>
int
main ()
{
/* Open the connection to the X server */
xcb_connection_t *connection = xcb_connect (NULL, NULL);
/* Get the first screen */
const xcb_setup_t *setup = xcb_get_setup (connection);
xcb_screen_iterator_t iter = xcb_setup_roots_iterator (setup);
xcb_screen_t *screen = iter.data;
printf ("root window id %d\n", screen->root);
xcb_disconnect (connection);
return 0;
}
xcbroot.st
Description: Binary data
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