#ifndef EXAMPLE_C_EXTEND_H #define EXAMPLE_C_EXTEND_H /* * 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 /* Declare your custom function to return QPDF_ERROR_CODE and take qpdf_data and anything else you * need. Any errors are retrievable through the qpdf C APIs normal error-handling mechanism. */ #ifdef __cplusplus extern "C" { #endif QPDF_ERROR_CODE num_pages(qpdf_data qc, int* npages); #ifdef __cplusplus } #endif #endif /* EXAMPLE_C_EXTEND_H */