71 lines
1.4 KiB
C
71 lines
1.4 KiB
C
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#include <geos.h>
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#include <conio.h>
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#include <stdlib.h>
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unsigned char x,y;
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void (*oldMouseVector)();
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void (*oldKeyVector)();
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void foo1 (void) {
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// do something on mouse press/release
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gotoxy(x,y);
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++x;
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cputc('A');
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// call previous routine
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oldMouseVector();
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}
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void foo2 (void) {
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// do something on key press/release
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gotoxy(x,y);
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++y;
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cputc('B');
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// call previous routine
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oldKeyVector();
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}
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void hook_into_system(void) {
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// hook into system vectors - preserve old value
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oldMouseVector = (void (*)())mouseVector;
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mouseVector = (int)foo1;
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oldKeyVector = (void (*)())keyVector;
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keyVector = (int)foo2;
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}
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void remove_hooks(void) {
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mouseVector = (int)oldMouseVector;
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keyVector = (int)oldKeyVector;
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}
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int main(void) {
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x = 0;
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y = 0;
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/*
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To make cc65 do something for you before exiting you might register
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a function to be called using atexit call. #include <stdlib.h> then and
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write:
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*/
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atexit(&remove_hooks);
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clrscr();
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cputsxy(0,1, CBOLDON "Just" COUTLINEON "a " CITALICON "string." CPLAINTEXT );
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hook_into_system();
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/* This program will loop forever though */
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MainLoop();
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/*
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If not using atexit() you have to remember about restoring system vectors
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right before exiting your application. Otherwise the system will most
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likely crash.
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remove_hooks();
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*/
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return 0;
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}
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