C libxml2 xmlTextWriter 标签随机嵌套

Question

我有一个试图保存为 xml 的结构，创建小的 XML 似乎没有问题，但是对于较大的文件，它似乎嵌套了后面的标签，对于前 30 个左右我我得到格式正确的结果:

<argument><kind>2</kind><string>video.avi</string></argument><argument><kind>4</kind><string>0</string></argument>

但是，一段时间后，事情开始以以下格式进行:

<argument><kind>5</kind><string/><argument><kind>2</kind><string>sprite.gif</string></argument></argument>

这是不正确的，参数不应嵌套。

//Save an obiect as in xml/gm format
int save_obj(struct gm_object obj, char *file_str)
{
  xmlTextWriterPtr writer;
  xmlChar *tmp;
  // Create a new XmlWriter for uri, with no compression.
  writer = xmlNewTextWriterFilename(file_str, 0);
  if (writer == NULL)
  {
    return 1; //1 = error
  }
  xmlTextWriterStartDocument(writer, NULL, "UTF-8", "no");
  //Root
  xmlTextWriterStartElement(writer, BAD_CAST "object");
  xmlTextWriterWriteElement(writer, BAD_CAST "spriteName", BAD_CAST obj.spriteName);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "solid","%i",obj.solid);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "visible","%i",obj.visible);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "depth","%i",obj.depth);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "persistent","%i",obj.persistent);
  xmlTextWriterWriteElement(writer, BAD_CAST "maskName", BAD_CAST obj.maskName);
  xmlTextWriterWriteElement(writer, BAD_CAST "parentName", BAD_CAST obj.parentName);
  xmlTextWriterStartElement(writer, BAD_CAST "events");
  //This is where we store any ints that need to be converted to strings
  char str_int_converted[(CHAR_BIT * sizeof(int) - 1) / 3 + 2];
  int i;
  for (i = 0; i<obj.event_count-1;i++)
  {
    xmlTextWriterStartElement(writer, BAD_CAST "event");
    sprintf(str_int_converted, "%d", obj.events[i].enumb);
    xmlTextWriterWriteAttribute(writer, BAD_CAST "enumb", BAD_CAST str_int_converted);
    sprintf(str_int_converted, "%d", obj.events[i].eventtype);
    xmlTextWriterWriteAttribute(writer, BAD_CAST "eventtype", BAD_CAST str_int_converted);
    int ii;
    for (ii = 0; ii<obj.events[i].action_count-1;ii++)
    {
      xmlTextWriterStartElement(writer, BAD_CAST "action");
      xmlTextWriterWriteFormatElement(writer, BAD_CAST "libid", "%i", obj.events[i].actions[ii].libid);
      xmlTextWriterWriteFormatElement(writer, BAD_CAST "id","%i", obj.events[i].actions[ii].id);
      xmlTextWriterWriteFormatElement(writer, BAD_CAST "kind","%i", obj.events[i].actions[ii].kind);
      xmlTextWriterWriteFormatElement(writer, BAD_CAST "userelative","%i", obj.events[i].actions[ii].userelative);
      xmlTextWriterWriteFormatElement(writer, BAD_CAST "useapplyto", "%i", obj.events[i].actions[ii].useapplyto);
      xmlTextWriterWriteFormatElement(writer, BAD_CAST "isquestion", "%i", obj.events[i].actions[ii].isquestion);
      xmlTextWriterWriteFormatElement(writer, BAD_CAST "exetype","%i", obj.events[i].actions[ii].exetype);
      xmlTextWriterWriteElement(writer, BAD_CAST "functionname", BAD_CAST obj.events[i].actions[ii].functionname);
      xmlTextWriterWriteElement(writer, BAD_CAST "codestring", BAD_CAST obj.events[i].actions[ii].codestring);
      xmlTextWriterWriteElement(writer, BAD_CAST "whoName", BAD_CAST obj.events[i].actions[ii].whoName);
      xmlTextWriterWriteFormatElement(writer, BAD_CAST "relative","%i", obj.events[i].actions[ii].relative);
      xmlTextWriterWriteFormatElement(writer, BAD_CAST "isnot","%i", obj.events[i].actions[ii].isnot);
      xmlTextWriterStartElement(writer, BAD_CAST "arguments");
      int iii;
      for (iii = 0; iii<obj.events[i].actions[ii].arg_count-1;iii++)
      {
        //causing some of these to nest rather than properly close
        xmlTextWriterStartElement(writer, BAD_CAST "argument");
        xmlTextWriterWriteFormatElement(writer, BAD_CAST "kind", "%i", obj.events[i].actions[ii].arguments[iii].kind);
        xmlTextWriterWriteElement(writer, BAD_CAST "string", obj.events[i].actions[ii].arguments[iii].string);
        xmlTextWriterEndElement(writer); //Close <argument>
      }
      xmlTextWriterEndElement(writer); //Close <arguments>
      xmlTextWriterEndElement(writer); //Close <action>
    }
    xmlTextWriterEndElement(writer); //Close <event>
  }
  xmlTextWriterEndElement(writer); //Close <events>
  //Put physics stuff here
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObject","%i", obj.PhysicsObject);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObjectSensor","%i", obj.PhysicsObjectSensor);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObjectShape","%i", obj.PhysicsObjectShape);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObjectDensity","%f", obj.PhysicsObjectDensity);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObjectRestitution","%f", obj.PhysicsObjectRestitution);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObjectGroup","%i", obj.PhysicsObjectGroup);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObjectLinearDamping","%f", obj.PhysicsObjectLinearDamping);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObjectAngularDamping","%f", obj.PhysicsObjectAngularDamping);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObjectFriction","%f", obj.PhysicsObjectFriction);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObjectAwake","%i", obj.PhysicsObjectAwake);
  xmlTextWriterWriteFormatElement(writer, BAD_CAST "PhysicsObjectKinematic","%i", obj.PhysicsObjectKinematic);
  xmlTextWriterStartElement(writer, BAD_CAST "PhysicsShapePoints");
  //This is where we store any floats that need to be converted to strings
  char str_float_converted[(CHAR_BIT * sizeof(float) - 1) / 3 + 2];
  for (i=0;i<obj.point_count;i++)
  {
    xmlTextWriterWriteFormatElement(writer, BAD_CAST "point","%i,%i", obj.PhysicsShapePoints[i].x, obj.PhysicsShapePoints[i].y);
  }
  xmlTextWriterEndElement(writer); //Close <PhysicsShapePoints>
  xmlTextWriterEndDocument(writer);
  xmlFreeTextWriter(writer);
}

这是它生成的完整文件:http://pastebin.com/raw/iJHYWkWq抱歉，我无法将它放入这篇文章的正文中，因为它超出了字符数限制。如果能提供任何帮助，我将不胜感激，我已经在这个错误上工作了 4 个小时，而且我似乎找不到其他人遇到过这个问题，更不用说修复它了。

Answer 1

如果您将 NULL 传递给 xmlTextWriterWriteElement()，它就无法正常工作。在调用 API 或使用 xmlTextWriterWriteFormatElement() 和 %s 作为格式之前验证您的字符串不为 NULL。