Add example qpdfjob-remove-annotations

1 files changed, 78 insertions, 0 deletions

diff --git a/examples/qpdfjob-remove-annotations.cc b/examples/qpdfjob-remove-annotations.cc
new file mode 100644
index 00000000..dfab3f7b
--- /dev/null
+++ b/examples/qpdfjob-remove-annotations.cc
@@ -0,0 +1,78 @@
+#include <qpdf/QPDFJob.hh>
+#include <qpdf/QPDFUsage.hh>
+#include <qpdf/QUtil.hh>
+
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+
+// This example demonstrates how we can use the QPDFJob createQPDF and writeQPDF
+// methods to add custom transformations to the output produced by QPDFJob runs.
+// The example is a full copy of the qpdf program modified to allways remove all
+// annotations from the final output.
+
+static char const* whoami = 0;
+
+static void
+usageExit(std::string const& msg)
+{
+    std::cerr << std::endl
+              << whoami << ": " << msg << std::endl
+              << std::endl
+              << "For help:" << std::endl
+              << "  " << whoami << " --help=usage       usage information"
+              << std::endl
+              << "  " << whoami << " --help=topic       help on a topic"
+              << std::endl
+              << "  " << whoami << " --help=--option    help on an option"
+              << std::endl
+              << "  " << whoami
+              << " --help             general help and a topic list"
+              << std::endl
+              << std::endl;
+    exit(QPDFJob::EXIT_ERROR);
+}
+
+int
+realmain(int argc, char* argv[])
+{
+    whoami = QUtil::getWhoami(argv[0]);
+    QUtil::setLineBuf(stdout);
+
+    QPDFJob j;
+    try {
+        // See "HOW TO ADD A COMMAND-LINE ARGUMENT" in README-maintainer.
+        j.initializeFromArgv(argv);
+        auto qpdf_sp = j.createQPDF();
+        auto& pdf = *qpdf_sp;
+        for (auto page: pdf.getAllPages()) {
+            page.replaceKey("/Annots", "null"_qpdf);
+        }
+        j.writeQPDF(pdf);
+    } catch (QPDFUsage& e) {
+        usageExit(e.what());
+    } catch (std::exception& e) {
+        std::cerr << whoami << ": " << e.what() << std::endl;
+        return QPDFJob::EXIT_ERROR;
+    }
+    return j.getExitCode();
+}
+
+#ifdef WINDOWS_WMAIN
+
+extern "C" int
+wmain(int argc, wchar_t* argv[])
+{
+    return QUtil::call_main_from_wmain(argc, argv, realmain);
+}
+
+#else
+
+int
+main(int argc, char* argv[])
+{
+    return realmain(argc, argv);
+}
+
+#endif