ofstream 无法打开或写入文件

我已经看了几个小时了，我只知道答案很简单。不管我怎么做，似乎就是打不开文件。它是一个多类程序所以在头文件中我输入

#include <iostream>
#include < fstream>
class A{
  string path;
  A(string p): path(p){}
  ...
  ...
  void PrintToFile();
  void PrintBase();
  void PrintNext();
  ...
  ...
};

在cpp文件中我有

#include "A.h"
void A::PrintToFile(){
  ofstream f(path.c_str(), ios::out);
  assert(f.is_open);
  f << "markuptext" << endl;
  PrintBase();
  f << "endtag" << endl;
  f.close();
}

void A::PrintBase(){
  ofstream f(path.c_str(), ios::app);
  assert(f.is_open);
  f << "markuptext" << endl;
  f << somevale << endl;
   PrintNext();
  f << "endtag" << endl;
  f.close()
}
void A::PrintNext(){
  ofstream f (path.c_str(), ios::app);
  assert(f.is_open);
  f << "markuptext" << endl;
  f << somevalue << endl;
  f << "endtag" << endl;
  f.close()
}

我已经在构造函数和打开命令上使用了标志。有一次它成功打开了一个文件，但它从未向文件中写入任何内容。如果你有什么建议，我将不胜感激。

谢谢大家的帮助，看起来我是试图打开一个文件"。但即使现在我把这个弄清楚了，我的代码也没有写入那个打开的文件。我检查了我的权限，我正在做chmod a+rwx…下面是更详细的代码。

#ifndef XML_WRITER_H
#define XML_WRITER_H
#include "WordIndex.h"
#include "PageIndex.h"
#include "StringUtil.h"
#include "CS240Exception.h"
#include <iostream>
#include <fstream>

/* prints out the wordIndex to an xml file
*/
class XMLWriter{
private:
    WordIndex * wIndex;
    PageIndex * pIndex;
    URL baseurl;
    //const char * file;
    ofstream f;
public:
  XMLWriter();
  XMLWriter(string base);
  XMLWriter(XMLWriter & other){
      assert(&other != NULL);
      Init(other);
  }
  XMLWriter & operator =(XMLWriter & other){
      Free();
      Init(other);
  }
  ~XMLWriter(){
      Free();
  }
  void Load(WordIndex & wi, PageIndex & pi);

  //prints to the file
  void Print(char * ofile);
private:
  void Init(XMLWriter & other){
    baseurl = other.baseurl;
    wIndex = other.wIndex;
    pIndex = other.pIndex;
  }
  void Free(){
  }
  void PrintWebsite();
  void PrintStartURL();
  void PrintPages();
  void PrintIndex();
  void PrintWord(OccurenceSet ocs);
  void PrintValue(string s);
  void PrintOccurence(Occurence o);
  void PrintPage(Page & page );
  void PrintDescription(string dscrptn );
  void PrintValue(int n );
  void PrintURL(URL url );
};
#endif

#include "XMLWriter.h"
XMLWriter::XMLWriter(){
}
XMLWriter::XMLWriter( string base): baseurl(base){
//cout << "filename : " << filename << endl;
//file =  filename.c_str();
//cout << "file : " << *file << endl;
}

void XMLWriter::Load(WordIndex & wi, PageIndex & pi){
wIndex = &wi;
pIndex = &pi;
wIndex->ResetIterator();
pIndex->ResetIterator();
}

void XMLWriter::Print(char * filename){
    cout << filename << endl;
    ofstream f(filename);
    if(!f){
      cout << "file : " << filename;
      throw CS240Exception("could not open the file for writing");
    }
    PrintWebsite();
    f.close();
}
//private methods
//
void XMLWriter::PrintWebsite(){

    f <<"<website>n";
    PrintStartURL();
    PrintPages();
    PrintIndex();
    f << "</website>" << endl;
}
// startURL
//
void XMLWriter::PrintStartURL( ){
    f << "t" << "<start-url>"<< endl;
    string val = baseurl.Value();
    StringUtil::EncodeToXml(val);
    f << "tt" << val << endl;
    f << "t" << "</start-url>"<< endl;

}
//pages
//
void XMLWriter::PrintPages(){
    f << "t" << "<pages>"<< "n";
    while(pIndex->HasNext())
    PrintPage(*(pIndex->Next()));
    f << "t" <<"</pages>"<<  'n';
}
void XMLWriter::PrintPage(Page & page ){
    f << "tt" <<"<page>"<< endl;
    PrintURL(page.Value());
    PrintDescription(page.Description() );
    f << "tt" <<"</page>"<< endl;
}
void XMLWriter::PrintURL(URL url){
    f << "ttt<url>"<< endl;
    f << "tttt" << StringUtil::EncodeToXmlCopy(url.Value()) << endl;
    f << "ttt</url>"<< endl;
}
void XMLWriter::PrintDescription(string dscrptn){
    f << "ttt<description>";
    f << StringUtil::EncodeToXmlCopy(dscrptn);
    f << "</description>"<< endl;
}
//index
//
void XMLWriter::PrintIndex(){
    f << "t<index>"<< endl;
    while(wIndex->HasNext())
        PrintWord(*(wIndex->Next()) );
    f << "t</index>"<< endl;
}
void XMLWriter::PrintWord(OccurenceSet ocs ){
    f << "tt<word>" << endl;
    PrintValue(ocs.Value());
    ocs.ResetIterator();
    while(ocs.HasNext())
        PrintOccurence(*(ocs.Next()) );
    f << "tt</word>"<< endl;
}
void XMLWriter::PrintValue(string s ){
    f << "ttt<value>";
    f << StringUtil::EncodeToXmlCopy(s);
    f << "</value>"<< endl;
}
void XMLWriter::PrintOccurence(Occurence o ){
    f << "ttt<occurence>" << endl;
    PrintURL(o.Value()->Value());
    PrintValue(o.NumOfOccur());
    f << "<ttt/occurence>"<< endl;
}
void XMLWriter::PrintValue(int n ){
    f << "tttt<count>";
    f << n;
    f << "</count>"<< endl;
}

它不会向文件写入任何内容:(但现在它正在创建一个文件，所以这是一个步骤:-D。显然我有数据结构和其他东西来支持这个，但我只需要把它写下来。提前感谢