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received a fatal signal (Segmentation fault) using udf to reading node coordinate

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Old   July 28, 2017, 13:56
Default received a fatal signal (Segmentation fault) using udf to reading node coordinate
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hi
i wanted to see node coordinates so i wrote this udf:



#include "udf.h"
FILE *fout;
int n;
Node *v;
void Print_Thread_node_position(Domain *domain, int id)
{
face_t f;
Thread *t = Lookup_Thread(domain, id);
fprintf(fout,"thread id %d\n", id);
begin_f_loop(f, t)
{
f_node_loop(f, t, n)
{
v=F_NODE(f,t,n);
NODE_MARK(v) = 0;
}
}
end_f_loop(f, t);
begin_f_loop(f, t)
{
f_node_loop(f, t, n)
{
real pos_x;
real pos_y;
real pos_z;
pos_x = NODE_X(v);
pos_y = NODE_Y(v);
pos_z = NODE_Z(v);
if(NODE_MARK(v) == 0) /* if not already visited */
fprintf(fout, " f%g %g %g\n", pos_x, pos_y, pos_z);
NODE_MARK(v) = 1;
}

}
end_f_loop(f, t);
fprintf(fout, "\n");
}

DEFINE_ON_DEMAND(get_coords)
{
Domain *domain;
domain = Get_Domain(1);
fout = fopen("faces.out", "w");
Print_Thread_node_position(domain, 2);
Print_Thread_node_position(domain, 4);
fclose(fout);
}


but after executing i get this error:
Error: received a fatal signal (Segmentation fault).

can you tell me what's wrong?
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Old   July 28, 2017, 16:55
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i used <Message("")> there is a problem with this line:
Print_Thread_node_position(domain, );
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