Method open

samples/zlib/iostream2/zstream.h:177–182

Opens a gzip (.gz) file for writing. * The compression level parameter should be in 0..9 * errno can be checked to distinguish two error cases * (if errno is zero, the zlib error is Z_MEM_ERROR). */

         * (if errno is zero, the zlib error is Z_MEM_ERROR).
         */
        void open(const char* name, int level = Z_DEFAULT_COMPRESSION) {
            char mode[4] = "wb\0";
            if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level;
            if (m_fp) close();
            m_fp = ::gzopen(name, mode);
        }

        /* open from a FILE pointer.
         */