qt - Lua Dump in C++ -

i want export binary chunk lua_dump or luau_dump..

the error: return <-luar

don't have compile error or static problems code, <-luar return

what can do? result problem?

private: const char* buildlua(qstring luascript) {     const proto* f;     char *bytecode = 0l;     size_t bytecodelen = 0;     wdata wd = { &bytecodelen, &bytecode };     string ts = luascript.tostdstring();     const char* cs;     lua_state *l = lual_newstate();     f=combine(l,0);     lual_loadstring(l,ts.c_str());     lual_openlibs(l);     lua_lock(l);     luau_dump(l,f,kpt_lua_writer,&wd,1);     lua_unlock(l);     lua_close(l);     cs = bytecode;     return cs; }  static const char* kpt_lua_reader(lua_state *l, void *ud, size_t *size) {     unused(l);     if ((*(int*)ud)--)     {         *size=sizeof(function)-1;         return function;     }     else     {         *size=0;         return null;     } }  static int kpt_lua_writer(lua_state * /*l*/, const void *p, size_t sz, void *ud) {     wdata *wd = (wdata *)ud;      char *newdata;      if((newdata = (char *)realloc(*(wd->data), (*(wd->len)) + sz))) {         memcpy(newdata + (*(wd->len)), p, sz);         *(wd->data) = newdata;         *(wd->len) += sz;     } else {         free(newdata);         return 1;     }      return 0; }  static const proto* combine(lua_state* l, int n) {     if (n==1)         return toproto(l,-1);     else     {         proto* f;         int i=n;         if (lua_load(l,kpt_lua_reader,&i,"=(keppedev)",null)!=lua_ok) fatal(lua_tostring(l,-1));         f=toproto(l,-1);         (i=0; i<n; i++)         {             f->p[i]=toproto(l,i-n-1);             if (f->p[i]->sizeupvalues>0) f->p[i]->upvalues[0].instack=0;         }         f->sizelineinfo=0;         return f;     } }  static void fatal(const char* message) {     qwidget *widget = new qwidget();     qmessagebox::warning(widget,"keppe develop",message); } 

http://www.keppe.org/img/luar.png

there no need use internals of lua. in case, should call lual_loadstring or lual_loadbuffer, not lual_dostring, executes code in string:

lua_state *l = lual_newstate(); lual_loadstring(l,s.c_str()); lua_dump(l,writer,null); lua_close(l); 

however, should test return values of both lual_loadstring , lua_dump.