/usr/share/httrack/libtest/callbacks-example-simple.c is in libhttrack-dev 3.44.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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HTTrack external callbacks example : print all downloaded html documents
How to build: (callback.so or callback.dll)
With GNU-GCC:
gcc -O -g3 -Wall -D_REENTRANT -shared -o mycallback.so callbacks-example.c -lhttrack2
With MS-Visual C++:
cl -LD -nologo -W3 -Zi -Zp4 -DWIN32 -Fe"mycallback.dll" callbacks-example.c libhttrack.lib
Note: the httrack library linker option is only necessary when using libhttrack's functions inside the callback
How to use:
httrack --wrapper mycallback ..
*/
/* system includes */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* standard httrack module includes */
#include "httrack-library.h"
#include "htsopt.h"
#include "htsdefines.h"
/* external functions */
EXTERNAL_FUNCTION int hts_plug(httrackp *opt, const char* argv);
EXTERNAL_FUNCTION int hts_unplug(httrackp *opt);
/* local function called as "check_html" callback */
static int process_file(t_hts_callbackarg /*the carg structure, holding various information*/*carg, /*the option settings*/httrackp *opt,
/*other parameters are callback-specific*/
char* html, int len, const char* url_address, const char* url_file) {
void *ourDummyArg = (void*) CALLBACKARG_USERDEF(carg); /*optional user-defined arg*/
/* call parent functions if multiple callbacks are chained. you can skip this part, if you don't want previous callbacks to be called. */
if (CALLBACKARG_PREV_FUN(carg, check_html) != NULL) {
if (!CALLBACKARG_PREV_FUN(carg, check_html)(CALLBACKARG_PREV_CARG(carg), opt,
html, len, url_address, url_file)) {
return 0; /* abort */
}
}
printf("file %s%s content: %s\n", url_address, url_file, html);
return 1; /* success */
}
/* local function called as "end" callback */
static int end_of_mirror(t_hts_callbackarg /*the carg structure, holding various information*/*carg, /*the option settings*/httrackp *opt) {
void *ourDummyArg = (void*) CALLBACKARG_USERDEF(carg); /*optional user-defined arg*/
/* processing */
fprintf(stderr, "That's all, folks!\n");
/* call parent functions if multiple callbacks are chained. you can skip this part, if you don't want previous callbacks to be called. */
if (CALLBACKARG_PREV_FUN(carg, end) != NULL) {
/* status is ok on our side, return other callabck's status */
return CALLBACKARG_PREV_FUN(carg, end)(CALLBACKARG_PREV_CARG(carg), opt);
}
return 1; /* success */
}
/*
module entry point
the function name and prototype MUST match this prototype
*/
EXTERNAL_FUNCTION int hts_plug(httrackp *opt, const char* argv) {
/* optional argument passed in the commandline we won't be using here */
const char *arg = strchr(argv, ',');
if (arg != NULL)
arg++;
/* plug callback functions */
CHAIN_FUNCTION(opt, check_html, process_file, /*optional user-defined arg*/NULL);
CHAIN_FUNCTION(opt, end, end_of_mirror, /*optional user-defined arg*/NULL);
return 1; /* success */
}
/*
module exit point
the function name and prototype MUST match this prototype
*/
EXTERNAL_FUNCTION int hts_unplug(httrackp *opt) {
fprintf(stderr, "Module unplugged");
return 1; /* success */
}
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