mirror of https://github.com/qpdf/qpdf.git
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
#include <qpdf/qpdfjob-c.h>
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#include <qpdf/qpdflogger-c.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// This example demonstrates how we can redirect where saved output goes by calling the default
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// logger's setSave method before running something with QPDFJob. See qpdfjob-c-save-attachment.c
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// for an implementation that uses the C API.
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static int
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save_to_file(char const* data, size_t len, void* udata)
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{
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FILE* f = (FILE*)udata;
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return fwrite(data, 1, len, f) != len;
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}
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static FILE*
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do_fopen(char const* filename)
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{
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FILE* f = NULL;
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#ifdef _MSC_VER
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if (fopen_s(&f, filename, "wb") != 0) {
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f = NULL;
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}
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#else
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f = fopen(filename, "wb");
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#endif
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if (f == NULL) {
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fprintf(stderr, "unable to open %s\n", filename);
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exit(2);
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}
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return f;
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}
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int
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main(int argc, char* argv[])
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{
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char const* whoami = "qpdfjob-c-save-attachment";
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char const* filename = NULL;
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char const* key = NULL;
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char const* outfilename = NULL;
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char* attachment_arg = NULL;
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char const* attachment_flag = "--show-attachment=";
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size_t flag_len = 0;
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FILE* outfile = NULL;
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int status = 0;
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qpdfjob_handle j = NULL;
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qpdflogger_handle l = qpdflogger_default_logger();
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if (argc != 4) {
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fprintf(stderr, "Usage: %s file attachment-key outfile\n", whoami);
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exit(2);
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}
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filename = argv[1];
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key = argv[2];
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outfilename = argv[3];
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flag_len = strlen(attachment_flag) + strlen(key) + 1;
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attachment_arg = malloc(flag_len);
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#ifdef _MSC_VER
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strncpy_s(attachment_arg, flag_len, attachment_flag, flag_len);
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strncat_s(attachment_arg, flag_len, key, flag_len - strlen(attachment_arg));
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#else
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strncpy(attachment_arg, attachment_flag, flag_len);
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strncat(attachment_arg, key, flag_len - strlen(attachment_arg));
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#endif
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char const* j_argv[5] = {
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whoami,
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filename,
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attachment_arg,
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"--",
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NULL,
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};
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outfile = do_fopen(outfilename);
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/* Use qpdflogger_set_save with a callback function to redirect saved data. You can use other
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* qpdf logger functions to capture informational output, warnings, and errors.
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*/
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qpdflogger_set_save(l, qpdf_log_dest_custom, save_to_file, (void*)outfile, 0);
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qpdflogger_cleanup(&l);
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j = qpdfjob_init();
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status = (qpdfjob_initialize_from_argv(j, j_argv) || qpdfjob_run(j));
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qpdfjob_cleanup(&j);
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free(attachment_arg);
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fclose(outfile);
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if (status == qpdf_exit_success) {
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printf("%s: wrote attachment to %s\n", whoami, outfilename);
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}
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return 0;
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}
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