There is a command-line option to add an export macro to all definitions.
Use something like:
protoc --cpp_out=dllexport_decl=MY_EXPORT_MACRO:outdir
However, be very careful when passing protobuf objects across a DLL
boundary. The code on both sides must be dynamically linked against the
same version of the C runtime, otherwise you run into all kinds of binary
compatibility and heap issues. See vsprojects/readme.txt for more
information.
On Fri, Nov 5, 2010 at 1:15 AM, yang yu <kojiyij...@gmail.com> wrote:
> I'm working on windows, some of my projects are dlls.
> i need to add __declspec dllexport/dllimport symbol with the function or
> variables to use the project as dll.
> but when i use protoc generate the source for the proto file, of course
> they don't have the dllexport/dllimport symbol.
> the problem is after build dll A(have a proto), when i build B link the
> project A, i got some link error like this:
> error LNK2019: unresolved external symbol "void
> PB:protobuf_AddDesc_Point2df_2eproto(void)""..................
>
> because the function "void PB:protobuf_AddDesc_Point2df_2eproto(void)" in
> dll A didn't export,
> so the project B link faild.
> anything help would be wonderful.
>
> -----------------------------------------------the situation like
> this-------------------------------------------
> in DLL-A, have a proto like this:
> ---------point.proto---------
> package PB;
>
> message Point2df
> {
> required float x = 1;
> required float y = 2;
> }
>
> in DLL-B, have a proto like this;
> ---------path.proto---------
> package PB;
> import "point.proto";
> message Path
> {
> repeated Point2df points = 1;
> }
>
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