Coherent PDF C/C++ API Usage Examples

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Here are some examples of the Coherent PDF C/C++ API in action. For more instructions, see the Full PDF Manual.

#include <stdbool.h>
#include "cpdflibwrapper.h"

int main (int argc, char ** argv)
{
  /* Initialise cpdf */
   cpdf_startup(argv);

  /* We will take the input hello.pdf and repeat it three times */
  int mergepdf = cpdf_fromFile("hello.pdf", "");

  /* Check the error state */
  if (cpdf_lastError) return 1;

  /* Clear the error state */
  cpdf_clearError();

  /* The array of PDFs to merge */
  int pdfs[] = {mergepdf, mergepdf, mergepdf};

  /* Merge them */
  int merged = cpdf_mergeSimple(pdfs, 3);

  if (cpdf_lastError) return 1;

  cpdf_clearError();

  /* Write output */
  cpdf_toFile(merged, "merged.pdf", false, false);

  if (cpdf_lastError) return 1;

  return 0;
}

Read the file hello.pdf and triplicate it, writing to merged.pdf

/* Squeeze the manual. */
#include <stdbool.h>
#include "cpdflibwrapper.h"

int main (int argc, char ** argv)
{
  /* Initialise cpdf */
  cpdf_startup(argv);

  /* Clear the error state */
  cpdf_clearError();

  /* Use the cpdflib manual as an example. */
  int pdf = cpdf_fromFile("cpdflibmanual.pdf", "");

  /* Check the error state */
  if (cpdf_lastError) return 1;

  cpdf_clearError();

  /* Squeeze it */
  cpdf_squeezeInMemory(pdf);

  /* Check the error state */
  if (cpdf_lastError) return 1;

  /* Clear the error state */
  cpdf_clearError();

  /* Write output. We make sure to use toFileExt, and make object streams. */
  cpdf_toFileExt(pdf, "squeezed.pdf", false, false, true, true, true);

  /* NOTE that the in-memory document 'pdf' is now defunct, following the call
  to toFileExt, so we must remove it. */
  cpdf_deletePdf(pdf);

  /* Check the error state */
  if (cpdf_lastError) return 1;

  return 0;
}

Read the file cpdflibmanual.pdf and squeeze it, writing to squeezed.pdf