Thanks, but when I print out the char* using string.data(), it got
truncated too. Later, I need to transfer this char* through TCP socket,
which apparently cannot be decoded right at the server side. Did I do
something wrong with the definition of the message?
Ke
On Wednesday, March 12, 2014 5:28:50 AM UTC-5, Ilia Mirkin wrote:
>
> On Tue, Mar 11, 2014 at 11:09 PM, Ke Wang <kewa...@gmail.com <javascript:>>
> wrote:
> > Hi all,
> >
> > I am using google protocol buffer to transmit complex data structures
> over
> > socket. Here is the .proto file:
> >
> > message MatrixMsg
> > {
> > required string msgType = 1;
> > optional int64 count = 2;
> > optional string extraInfo = 3;
> > message TaskMsg
> > {
> > required string taskId = 1;
> > required string user = 2;
> > required string dir = 3;
> > required string cmd = 4;
> > required int64 dataLength = 5;
> > }
> > repeated TaskMsg tasks = 4;
> > }
> >
> > I serialized a MatrixMsg to string through SerializeAsString(), and the
> > string length is 500. Now, I want to convert the string to char* in
> order to
> > send it through socket. However, when I converted to char* through
> > string.c_str(), the string got truncated. I printed out the string, and
> > figured out there are white space in it. How do I get a char* that is
> > exactly matches the string? Thanks!
>
> If you have a std::string, you can get at the data with str.data(),
> and the length is str.length(). There can be null characters in the
> output, so things like strlen won't produce useful results. [And
> there's some subtle difference between .data() and .c_str() but I
> don't quite remember what it is, and it might only be a theoretical
> difference and not an actual one given the gcc implementation. My
> memory is a little hazy on the topic though.]
>
> HTH,
>
> -ilia
>
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