Hi everybody,

I'm pretty new to ROS and trying to write an application in C++ on Windows 7 that is able to read .bag files. I'm stuck now and could really use some help. These are the things I have done so far:

• I got the pre-compiled SDK for Windows from http://wiki.ros.org/win_ros/hydro/Msvc%20SDK and followed the steps for installing it. I validated that it's working as expected (part 3 of the instructions)
• I set up a new project in Visual Studio 2010 according to this guide http://wiki.ros.org/win_ros/hydro/Msvc%20SDK%20Projects
• I took the code from the Reader example here http://wiki.ros.org/rosbag/Code%20API and put it into the main.cpp file
• Since I was getting many linker errors, I added all ros-libs as linker Input, which resolved most of the Errors

However, I'm still stuck with four LNK2019 Errors, which seem to be related to the usage of iterators when accessing the view. Here is my complete code:

#include "stdafx.h"

#include <rosbag/bag.h>
#include <rosbag/view.h>
#include <std_msgs/Int32.h>
#include <std_msgs/String.h>

int _tmain(int argc, _TCHAR* argv[])
{
rosbag::Bag bag;
bag.open("test.bag", rosbag::bagmode::Read);

std::vector<std::string> topics;
topics.push_back(std::string("chatter"));
topics.push_back(std::string("numbers"));

rosbag::View view(bag, rosbag::TopicQuery(topics));

for(rosbag::View::iterator it = view.begin(); it != view.end(); ++it)
{
    std_msgs::String::ConstPtr s = it->instantiate<std_msgs::String>();
    if (s != NULL)
    {
        std::cout << s->data << std::endl;
    }

    std_msgs::Int32::ConstPtr i = it->instantiate<std_msgs::Int32>();
    if (i != NULL)
    {
        std::cout << i->data << std::endl;
    }
}

bag.close();
return 0;

}

And These are the errors I get when attempting to build:

• 1>RosbagReader2010.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""public: _thiscall rosbag::View::iterator::~iterator(void)" (??1iterator@View@rosbag@@QAE@XZ)" in Funktion "wmain".
• 1>RosbagReader2010.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""private: void _thiscall rosbag::View::iterator::increment(void)" (?increment@iterator@View@rosbag@@AAEXXZ)" in Funktion ""private: static void _cdecl boost::iteratorcoreaccess::increment(class rosbag::View::iterator &)" (??$increment@Viterator@View@rosbag@@@iteratorcoreaccess@boost@@CAXAAViterator@View@rosbag@@@Z)".
• 1>RosbagReader2010.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""private: class rosbag::MessageInstance & _thiscall rosbag::View::iterator::dereference(void)const " (?dereference@iterator@View@rosbag@@ABEAAVMessageInstance@3@XZ)" in Funktion ""private: static class rosbag::MessageInstance & _cdecl boost::iteratorcoreaccess::dereference(class rosbag::View::iterator const &)" (??$dereference@Viterator@View@rosbag@@@iteratorcoreaccess@boost@@CAAAVMessageInstance@rosbag@@ABViterator@View@3@@Z)".
• 1>RosbagReader2010.obj : error LNK2019: Verweis auf nicht aufgelöstes externes Symbol ""private: bool _thiscall rosbag::View::iterator::equal(class rosbag::View::iterator const &)const " (?equal@iterator@View@rosbag@@ABENABV123@@Z)" in Funktion ""private: static bool _cdecl boost::iteratorcoreaccess::equal(class rosbag::View::iterator const &,class rosbag::View::iterator const &,struct boost::mpl::bool<1>)" (??$equal@Viterator@View@rosbag@@V123@@iteratorcoreaccess@boost@@CANABViterator@View@rosbag@@0U?$bool@$00@mpl@1@@Z)".

Sorry, these contain some German words, which are saying "reference to an unresolved external symbol". I don't know which libs I could additionally include or generally what to do now to overcome this issue. Any help/hint is appreciated. Thank you very much in advance!