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Diffstat (limited to 'examples/extend-c-api.c')
-rw-r--r-- | examples/extend-c-api.c | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/examples/extend-c-api.c b/examples/extend-c-api.c new file mode 100644 index 00000000..aa603845 --- /dev/null +++ b/examples/extend-c-api.c @@ -0,0 +1,67 @@ +/* + * This is an example of how to write C++ functions and make them usable with the qpdf C API. It + * consists of three files: + * - extend-c-api.h -- a plain C header file + * - extend-c-api.c -- a C program that calls the function + * - extend-c-api.cc -- a C++ file that implements the function + */ + +#include "extend-c-api.h" +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +static char const* whoami = 0; + +static void +usage() +{ + fprintf(stderr, "Usage: %s infile\n", whoami); + exit(2); +} + +int +main(int argc, char* argv[]) +{ + char* infile = NULL; + qpdf_data qpdf = qpdf_init(); + int warnings = 0; + int errors = 0; + char* p = NULL; + + if ((p = strrchr(argv[0], '/')) != NULL) { + whoami = p + 1; + } else if ((p = strrchr(argv[0], '\\')) != NULL) { + whoami = p + 1; + } else { + whoami = argv[0]; + } + + if (argc != 2) { + usage(); + } + + infile = argv[1]; + + if ((qpdf_read(qpdf, infile, NULL) & QPDF_ERRORS) == 0) { + int npages; + if ((num_pages(qpdf, &npages) & QPDF_ERRORS) == 0) { + printf("num pages = %d\n", npages); + } + } + if (qpdf_more_warnings(qpdf)) { + warnings = 1; + } + if (qpdf_has_error(qpdf)) { + errors = 1; + printf("error: %s\n", qpdf_get_error_full_text(qpdf, qpdf_get_error(qpdf))); + } + qpdf_cleanup(&qpdf); + if (errors) { + return 2; + } else if (warnings) { + return 3; + } + + return 0; +} |