I'm having a problem writing multiple messages to a file and reading
them back in c++ using GPB 2.3.0. What I'm trying to do:
I have a GPB generated object that contains a repeated field, e.g.
myobject.proto is:
message MyObject {
required uint64 x =1;
required uint32 y =2;
repeated uint32 z =3 [packed = true];
}
I am taking the object, populating it with some random data and
writing it to a file with the name filename. E.g. for method
populateMyObject I have:
void populateMyObject(const char * filename){
google::protobuf::uint64 x;
google::protobuf::uint32 y;
google::protobuf::uint32 z;
//open file for writing
int fd = open(filename, O_CREAT | O_TRUNC | O_RDWR, S_IREAD |
S_IWRITE);
//create codedoutputstream
FileOutputStream output(fd);
CodedOutputStream codedOutput(output);
//create 5 objects with dummy data
for (int i = 0; i 5; i++) {
boost::shared_ptrMyObject myObject =
boost::shared_ptrMyObject(new MyObject());
x = i;
y = (i + 1);
myObject-set_x(x);
myObject-set_y(y);
//populate repeated field with 10 values
for (ofs::UInt32 idx = 0; idx 10; idx++) {
z = idx;
myObject-add_z(z);
}
google::protobuf::uint32 myObjectSize = myObject-ByteSize();
//write size of this serialized object
codedOutput.WriteVarint32(sparseImageSize);
//serialize this object to file
myObject-SerializeToCodedStream(codedOutput)) {
}
output.Flush();
output.Close();
close(fd);
}
However, when I run this method, I get the following error:
libprotobuf FATAL google/protobuf/io/zero_copy_stream_impl_lite.cc:
346] CHECK failed: (buffer_used_) == (buffer_size_): BackUp() can
only be called after Next().
Any ideas on what I'm doing wrong here? The problem is that the fatal
error exits, so I can't continue to any other code, even though it
appears (and I've read the file created successfully) that the file is
created OK with multiple MyObjects being serialized. Should I be
using some buffer of some kind? If any one can supply any sample code
that does this successfully I'd be very grateful, thanks.
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