c++ - RapidXml Work when build but have problems in debugger -

hi use rapidxml load map in game how class loading looks it's compiling when loading file crashing wanted debug debugger dont function setting pointers data in xml file.

#0 0042d5a6 rapidxml::xml_node<char>::first_node(this=0x0, name=0x484175 <_zst16__convert_from_vrkpipcipkcz+4735349> "mapinfo", name_size=7, case_sensitive=true) (c:/.../rapidxml.hpp:942) #1 00404e31 maploader::setnodes(this=0x27fc1c) (c:\...\main.cpp:651) #2 004032f6 main() (c:\...\main.cpp:267)   class maploader { public: xml_document<> doc; file<>xmlfile(char); string ca,cb,cc,cd;  xml_node<> *test;  xml_node<> *root;     xml_node<> *mapinfo;         xml_node<> *name;         xml_node<> *date;         xml_node<> *msize;             xml_attribute<> *sizex;             xml_attribute<> *sizey;     xml_node<> *mapdata;         xml_node<> *layer;             xml_attribute<> *nr;                 xml_node<> *tile;                     xml_attribute<> *id;                     xml_attribute<> *x;                     xml_attribute<> *y;  void loadfile(const char *filename); void setnodes(); void fillvector(); void savevector(); };  void maploader::setnodes() {     root=doc.first_node("root");         mapinfo=root->first_node("mapinfo");   //////debugger pointing on line             name=mapinfo->first_node("name");             date=mapinfo->first_node("date");             msize=mapinfo->first_node("size");                 sizex=msize->first_attribute("x");                 sizey=msize->first_attribute("y");         mapdata=root->first_node("mapdata");             layer=mapdata->first_node("layer");                 nr=layer->first_attribute("id");                     tile=layer->first_node("tile");                         id=tile->first_attribute("id");                         x=tile->first_attribute("x");                         y=tile->first_attribute("y"); } 

what can repair or that?

edit: here xml file:

<?xml version="1.0" encoding="utf-8"?> <root>     <mapinfo>         <name>test</name>         <date>17.08.2014</date>         <size x="64" y="64"/>     </mapinfo>     <mapdata>         <layer nr="1">             <tile id="1" x="32" y="32"/>             <tile id="1" x="32" y="64"/>             <tile id="1" x="512" y="64"/>         </layer>         <layer nr="2"/>         <layer nr="3"/>     </mapdata> </root> 

first of practice check null returned pointer. guess be, "root" missing in xml file.

take @ the manual of rapidxml because case sensitivity can issue.

edit:

i wrote small program , checked @ least name , date. works me.

// trying out rapid xml. // #include "rapidxml/rapidxml.hpp" #include <cstdio> #include <string> #include <vector>  int main(int argc, char** argv) {     rapidxml::xml_document<> doc;    // character type defaults char     file* file = fopen("test.xml", "r");     if (!file)         return 1;     // file exists.     // number of bytes.     fseek(file, 0, seek_end);     size_t sizeinbytes = ftell(file);     fseek(file, 0, seek_set);     char* buffer = static_cast<char*>(malloc(sizeinbytes + 1));  // + 1 needed?     if (fread(buffer, 1lu, sizeinbytes, file) != sizeinbytes) {         perror("unexpected file length\n");         fclose(file);         free(buffer);         return 1;     }     buffer[sizeinbytes] = 0;     // close file.     fclose(file);     doc.parse<0>(buffer);        // 0 means default parse flags     std::vector<std::string> nodenames;     nodenames.push_back("name");     nodenames.push_back("date");     rapidxml::xml_node<>* node = doc.first_node("root");     (size_t = 0; < nodenames.size() && node; ++i) {         if (node->first_node(nodenames[i].c_str()))             fprintf(stderr, "cantfindnode name %s.\n", nodenames[i].c_str());         printf("node %s found!\n", nodenames[i].c_str());     }     free(buffer);     return 0;   }