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#2
rjsp2011-12-12 09:24
因为你对变量和函数的命名很java化，所以我懒得多说些什么
 程序代码：#include <iostream> #include <fstream> #include <sstream> #include <iterator> using namespace std; void WriteToFile( const char* filename ) { fstream file( filename ); if( !file ) { cerr << "Unable to open " << filename << '\n'; return; } ostringstream os; streampos pos = 0; for( istreambuf_iterator<char> itor(file); itor!=istreambuf_iterator<char>(); ++itor ) { pos += 1; if( *itor == '\n' ) os << pos << ' '; } file << os.str() << os.str().size()+pos; } int main() { WriteToFile( "d:/test.txt" ); return 0; } |
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我在vs中，写了代码进行测试，结果是正确的，代码如下：
程序代码：// t.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <ios>
#include <iostream>
#include <fstream>
#include <string>
using std::cout;
using std::cerr;
using std::endl;
using std::string;
using std::ios;
using std::fstream;
void writeToFile(const string &filename)
{
fstream outFile(filename.c_str(),ios::in | ios::out | ios::app);
if(outFile.fail())
{
cerr << "Unable to open " << filename << endl;
return;
}
char ch;
int cnt = 0;
while(outFile.get(ch))
{
cout.put(ch);
++cnt;
if(ch == '\n')
{
ios::pos_type mark = outFile.tellg();
outFile.seekp(ios::end);
outFile << cnt << ' ';
outFile.seekg(mark);
}
}
outFile.clear();
cout << "[" << cnt << "]" << endl;
outFile << cnt;
cout << "Write data sucessed!" << endl;
outFile.close();
}
int _tmain(int argc, _TCHAR* argv[])
{
string filename = "G:/test.txt";
writeToFile(filename);
return 0;
}
在qt creator中写了代码进行测试，但是结果始终不正确。qt creator中的代码如下：//
#include "stdafx.h"
#include <ios>
#include <iostream>
#include <fstream>
#include <string>
using std::cout;
using std::cerr;
using std::endl;
using std::string;
using std::ios;
using std::fstream;
void writeToFile(const string &filename)
{
fstream outFile(filename.c_str(),ios::in | ios::out | ios::app);
if(outFile.fail())
{
cerr << "Unable to open " << filename << endl;
return;
}
char ch;
int cnt = 0;
while(outFile.get(ch))
{
cout.put(ch);
++cnt;
if(ch == '\n')
{
ios::pos_type mark = outFile.tellg();
outFile.seekp(ios::end);
outFile << cnt << ' ';
outFile.seekg(mark);
}
}
outFile.clear();
cout << "[" << cnt << "]" << endl;
outFile << cnt;
cout << "Write data sucessed!" << endl;
outFile.close();
}
int _tmain(int argc, _TCHAR* argv[])
{
string filename = "G:/test.txt";
writeToFile(filename);
return 0;
}
程序代码：#include <QtCore/QCoreApplication>
#include <ios>
#include <iostream>
#include <fstream>
#include <string>
using std::ios;
using std::fstream;
using std::cout;
using std::cerr;
using std::endl;
using std::string;
void writeToFile(const string &filename)
{
fstream outFile(filename.c_str(),ios::in | ios::out | ios::app);
if(outFile.fail())
{
cerr << "Unable to open " << filename << endl;
return;
}
char ch;
int cnt = 0;
while(outFile.get(ch))
{
cout.put(ch);
++cnt;
if(ch == '\n')
{
ios::pos_type mark = outFile.tellg();
outFile.seekp(ios::end);
outFile << cnt << ' ';
outFile.seekg(mark);
}
}
outFile.clear();
cout << "[" << cnt << "]" << endl;
outFile << cnt;
cout << "Write data sucessed!" << endl;
outFile.close();
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
string filename = "G:/test.txt";
writeToFile(filename);
return 0;
}
写入文件后，文件中的内容是这样的：#include <ios>
#include <iostream>
#include <fstream>
#include <string>
using std::ios;
using std::fstream;
using std::cout;
using std::cerr;
using std::endl;
using std::string;
void writeToFile(const string &filename)
{
fstream outFile(filename.c_str(),ios::in | ios::out | ios::app);
if(outFile.fail())
{
cerr << "Unable to open " << filename << endl;
return;
}
char ch;
int cnt = 0;
while(outFile.get(ch))
{
cout.put(ch);
++cnt;
if(ch == '\n')
{
ios::pos_type mark = outFile.tellg();
outFile.seekp(ios::end);
outFile << cnt << ' ';
outFile.seekg(mark);
}
}
outFile.clear();
cout << "[" << cnt << "]" << endl;
outFile << cnt;
cout << "Write data sucessed!" << endl;
outFile.close();
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
string filename = "G:/test.txt";
writeToFile(filename);
return 0;
}
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和vs执行出来的结果是不一样的。vs的结果是正确的，qt creator是不正确的，为什么一样的代码执行出来的结果是不一样的，qt creator是如何处理的，真是不懂了，请各位高手帮忙解答下。谢谢了！！！