{"id":35,"date":"2009-01-28T10:19:40","date_gmt":"2009-01-28T16:19:40","guid":{"rendered":"http:\/\/www.ancor.ch\/schoebey\/?p=35"},"modified":"2009-01-28T10:19:59","modified_gmt":"2009-01-28T16:19:59","slug":"35","status":"publish","type":"post","link":"https:\/\/www.ancor.ch\/schoebey\/?p=35","title":{"rendered":"file format specifics"},"content":{"rendered":"

file io stuff<\/p>\n

<\/p>\n

Write:<\/p>\n

QFile file(“file.xxx”);
\nfile.open(QIODevice::WriteOnly);
\nQDataStream out(&file);<\/p>\n

\/\/ Write a header with a “magic number” and a version
\nout << (quint32)0xA0B0C0D0;
\nout << (qint32)123;<\/p>\n

out.setVersion(QDataStream::Qt_4_0);<\/p>\n

\/\/ Write the data
\nout << lots_of_interesting_data;<\/p><\/blockquote>\n

read:<\/p>\n

QFile file(“file.xxx”);
\nfile.open(QIODevice::ReadOnly);
\nQDataStream in(&file);<\/p>\n

\/\/ Read and check the header
\nquint32 magic;
\nin >> magic;
\nif (magic != 0xA0B0C0D0)
\nreturn XXX_BAD_FILE_FORMAT;<\/p>\n

\/\/ Read the version
\nqint32 version;
\nin >> version;
\nif (version < 100)
\nreturn XXX_BAD_FILE_TOO_OLD;
\nif (version > 123)
\nreturn XXX_BAD_FILE_TOO_NEW;<\/p>\n

if (version <= 110)
\nin.setVersion(QDataStream::Qt_3_2);
\nelse
\nin.setVersion(QDataStream::Qt_4_0);<\/p>\n

\/\/ Read the data
\nin >> lots_of_interesting_data;
\nif (version >= 120)
\nin >> data_new_in_XXX_version_1_2;
\nin >> other_interesting_data;<\/p><\/blockquote>\n","protected":false},"excerpt":{"rendered":"

file io stuff<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-35","post","type-post","status-publish","format-standard","hentry","category-code"],"_links":{"self":[{"href":"https:\/\/www.ancor.ch\/schoebey\/index.php?rest_route=\/wp\/v2\/posts\/35","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ancor.ch\/schoebey\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ancor.ch\/schoebey\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ancor.ch\/schoebey\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ancor.ch\/schoebey\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=35"}],"version-history":[{"count":4,"href":"https:\/\/www.ancor.ch\/schoebey\/index.php?rest_route=\/wp\/v2\/posts\/35\/revisions"}],"predecessor-version":[{"id":39,"href":"https:\/\/www.ancor.ch\/schoebey\/index.php?rest_route=\/wp\/v2\/posts\/35\/revisions\/39"}],"wp:attachment":[{"href":"https:\/\/www.ancor.ch\/schoebey\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=35"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ancor.ch\/schoebey\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=35"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ancor.ch\/schoebey\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=35"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}