I am not well versed in c++, just a disclamer. I have muddled through
creating a small client and I want to post the binary output via
HTTP. Here is the source I have so far:
#define CURL_STATICLIB
#include <iostream>
#include <fstream>
#include <string>
#include "mvm.pb.h"
#include "curl/curl.h"
#include "curl/types.h"
#include "curl/easy.h"
using namespace std;
int main(int argc, char* argv[]) {
// Verify that the version of the library that we linked against is
// compatible with the version of the headers we compiled against.
GOOGLE_PROTOBUF_VERIFY_VERSION;
mvm::protobuf::prov::prov prov;
mvm::protobuf::prov_Artifact* artifact = prov.mutable_object();
mvm::protobuf::prov_Execution* action = prov.mutable_action();
artifact->set_uuid("foo");
artifact->set_classification("unclassified");
action->set_action(mvm::protobuf::prov_Action_CREATED);
mvm::protobuf::prov_Actor* actor = action->mutable_performedby();
mvm::protobuf::prov_Person* person = actor->mutable_person();
person->set_uuid("person_uuid");
mvm::protobuf::prov_TimeStamp* timestamp = action-
>mutable_performedat();
timestamp->set_datetime(1234567890);
fstream output("mvm.out", ios::out | ios::trunc | ios::binary);
ostrstream os; // <- what to use here?
if (!prov.SerializeToOstream(&output)) {
cerr << "Failed to write mvm." << endl;
return -1;
}
if (!prov.SerializeToOstream(&os)) {
cerr << "Failed to write mvm to os." << endl;
return -1;
}
CURL *curl;
curl = curl_easy_init();
char *url = "http://localhost:8080/Protobuf/PostServlet";;
curl_easy_setopt(curl, CURLOPT_URL, url);
struct curl_httppost *formpost=NULL;
struct curl_httppost *lastptr=NULL;
curl_formadd(&formpost, &lastptr,
CURLFORM_COPYNAME, "mydata",
CURLFORM_PTRCONTENTS, "test\0test", // <- should
point to &os
CURLFORM_CONTENTSLENGTH, 50, // <- need to know the
size of &os
CURLFORM_END);
curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
curl_easy_perform(curl);
curl_easy_cleanup(curl);
// Optional: Delete all global objects allocated by libprotobuf.
google::protobuf::ShutdownProtobufLibrary();
return 0;
}
I added comments where I am having trouble. I basically just wan to
populate the body (content) of the HTTP post message with the binary
output of the SerializeToOStream call. Any help would be greatly
appreciated!
Birch
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