More code. This is the parsing code
<code>
void GetMessagesFromFile(const string& path)
{
ifstream* stream = new ifstream(path.c_str(), ios::in | ios::binary);
unsigned int endOfHeaderOffset = 0;
// read_header_from_file just reads the HeaderPB and computes
endOfHeaderOffset,
// via CodedInputStream CurrentPosition once parsing of header size and
header is done.
// yes, read_header_from_file uses limits on the coded stream to not
keep parsing
HeaderPB* header = read_header_from_file(path, stream,
endOfHeaderOffset);
// Loop over the entries in the header
if ( 0 < header->entry_size() )
{
// Loop over all entries
MyMessagePb* myMessagePB = NULL;
IFStreamReader* reader = NULL;
::google::protobuf::io::CodedInputStream* coded = NULL;
// Loop from an index of 0 to header->entry_size()
{
const HeaderPB::EntryPB& entryProtoBuff = header->entry
(entryIndex);
::google::protobuf::uint32 entrySize = entryProtoBuff.entry_
size_bytes();
::google::protobuf::uint32 entryOffset = entryProtoBuff.entry
_byte_offset_from_header();
// Put stream at byte offset and created IFStreamReader and
CodedInputStream
// PRINT("BYTE OFFSET ON READING FROM BEGGING OF FILE %d",
endOfHeaderOffset + entryOffset);
stream->seekg(endOfHeaderOffset + entryOffset, stream->beg);
reader = new IFStreamReader(stream);
coded = new ::google::protobuf::io::CodedInputStream(reader);
::google::protobuf::io::CodedInputStream::Limit oldLimit =
coded->PushLimit(entrySize);
myMessagePB = new MyMessagePB();
if ( myMessagePB->ParseFromCodedStream(coded) )
{
// Code reaches this point, but all data in myMessagePB is
null/not available via "has_xxxxx" function
// .... Do other stuff here......
}
coded->PopLimit(oldLimit);
delete coded;
delete reader;
}
}
delete header;
delete stream;
}
</code>
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