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[英]Looking for simple example of Boost message_queue and serialization usage
[英]boost json serialization and message_queue segfault
我正在使用boost-interprocess和ptree結構進行一些測試,當我嘗試讀取已發送的消息時(或當我嘗試在json中解析它時),我遇到了段錯誤。
我在debian linux上使用boost1.49。
我正在json中對其進行序列化以供以后使用,並且因為我沒有找到用於boost屬性三的直接序列化的任何好的文檔。
這是我用來測試的代碼(連說的segfault在哪里):
修訂版
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/interprocess/ipc/message_queue.hpp>
#include <sstream>
struct test_data{
std::string action;
std::string name;
int faceID;
uint32_t Flags;
uint32_t freshness;
};
test_data recvData()
{
boost::interprocess::message_queue::remove("queue");
boost::property_tree::ptree pt;
test_data data;
std::istringstream buffer;
boost::interprocess::message_queue mq(boost::interprocess::open_or_create,"queue", 1, sizeof(buffer)
boost::interprocess::message_queue::size_type recvd_size;
unsigned int pri;
mq.receive(&buffer,sizeof(buffer),recvd_size,pri);
std::cout << buffer.str() << std::endl; //the segfault is there
boost::property_tree::read_json(buffer,pt);
data.action = pt.get<std::string>("action");
data.name = pt.get<std::string>("name");
data.faceID = pt.get<int>("face");
data.Flags = pt.get<uint32_t>("flags");
data.freshness = pt.get<uint32_t>("freshness");
boost::interprocess::message_queue::remove("queue");
return data;
}
int main()
{
test_data test;
test = recvData();
std::cout << test.action << test.name << test.faceID << test.Flags << test.freshness << std::endl;
}
sender.cc
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/json_parser.hpp>
#include <boost/interprocess/ipc/message_queue.hpp>
#include <sstream>
struct test_data{
std::string action;
std::string name;
int faceID;
uint32_t Flags;
uint32_t freshness;
};
int sendData(test_data data)
{
boost::property_tree::ptree pt;
pt.put("action",data.action);
pt.put("name",data.name);
pt.put("face",data.faceID);
pt.put("flags",data.Flags);
pt.put("freshness",data.freshness);
std::ostringstream buffer;
boost::property_tree::write_json(buffer,pt,false);
boost::interprocess::message_queue mq(boost::interprocess::open_only,"chiappen")
std::cout << sizeof(buffer) << std::endl;
mq.send(&buffer,sizeof(buffer),0);
return 0;
}
int main ()
{
test_data prova;
prova.action = "registration";
prova.name = "prefix";
prova.Flags = 0;
prova.freshness = 52;
sendData(prova);
}
我知道現在答案還有些晚,但是無論如何..您不能將istringstream傳遞為接收緩沖區。 Boost消息隊列僅處理原始字節,而不處理類似std的對象。
要使其工作,必須使用char數組或以前由malloc保留的任何緩沖區。
例如:
char buffer [1024];
mq.receive(buffer, sizeof(buffer), recvd_size, pri);
發送相同,只能發送原始字節,因此不能使用ostringstream。
希望能幫助到你。
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