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-2

0

I have a simple code as bellow for reading and writing contents of a unicode text file:

#include <fstream>
#include <string>
#include <vector>
#include <iostream>
using namespace std;

int main()

 std::vector<std::wstring> words;
 std::wifstream in;
 in.open("test.txt", ios_base::in);
 if (in.is_open())
 
 std::wstring word;
 while (in.good())
 
 getline(in, word);
 words.push_back(word);
 
 
 else
 cout << "Cannot open file" << endl;

 std::wofstream out;
 out.open("result.txt", ios_base::out);

 for (size_t i = 0; i < words.size(); ++i)
 
 out << words[i] << endl;
 
 out.close();
 return 0;

In the result file, at the binning of each line (except for first line), a nul character will be inserted!
Please help me what is wrong in the code.
Thanks in advance!

Update

For better expression, when the test.txt file contains as bellow:

Hi
This is a test!

the result.txt will be as this picture:
enter image description here

As can be shown from image, a nul character will appear in the text!

if using this line

out << words[i] << endl;

instead of

out.write(words[i].c_str(), words[i].size() + 1);

the problem will grow! The Chines letters will appear in the result.txt
The test text:

Hi
This is a test code!
What is wrong?

The result:
enter image description here

On Windows OS, the code compiles with Microsoft Visual Studio and Intel Compiler. Both of them have the same behavior.
But on Android, Mobile C App run the program with no problem!

Can anybody help me?

c++ getline

share|improve this question

edited Mar 9 at 9:41

Khabarkhaan

asked Mar 9 at 3:35

KhabarkhaanKhabarkhaan

13

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  while (in.good()) is slightly better than the dreaded while (in.eof()), but it still tests for whether the data is good or not BEFORE reading and using the data. You need to read, test, and then use (or reject) the data. Any other order leaves the program open to one bug or another.
  
  – user4581301
  Mar 9 at 4:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for your response. The problem is on Windows, I tested the code on Visual Studio compiler, Intel compiler and Mobile C for Android. on Android the code has no problem but on Windows it encounters to mentioned issue.
  
  – Khabarkhaan
  Mar 9 at 9:05
  

  
  
  
  

add a comment | 

-2

0

I have a simple code as bellow for reading and writing contents of a unicode text file:

#include <fstream>
#include <string>
#include <vector>
#include <iostream>
using namespace std;

int main()

 std::vector<std::wstring> words;
 std::wifstream in;
 in.open("test.txt", ios_base::in);
 if (in.is_open())
 
 std::wstring word;
 while (in.good())
 
 getline(in, word);
 words.push_back(word);
 
 
 else
 cout << "Cannot open file" << endl;

 std::wofstream out;
 out.open("result.txt", ios_base::out);

 for (size_t i = 0; i < words.size(); ++i)
 
 out << words[i] << endl;
 
 out.close();
 return 0;

In the result file, at the binning of each line (except for first line), a nul character will be inserted!
Please help me what is wrong in the code.
Thanks in advance!

Update

For better expression, when the test.txt file contains as bellow:

Hi
This is a test!

the result.txt will be as this picture:
enter image description here

As can be shown from image, a nul character will appear in the text!

if using this line

out << words[i] << endl;

instead of

out.write(words[i].c_str(), words[i].size() + 1);

the problem will grow! The Chines letters will appear in the result.txt
The test text:

Hi
This is a test code!
What is wrong?

The result:
enter image description here

On Windows OS, the code compiles with Microsoft Visual Studio and Intel Compiler. Both of them have the same behavior.
But on Android, Mobile C App run the program with no problem!

Can anybody help me?

c++ getline

share|improve this question

edited Mar 9 at 9:41

Khabarkhaan

asked Mar 9 at 3:35

KhabarkhaanKhabarkhaan

13

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  while (in.good()) is slightly better than the dreaded while (in.eof()), but it still tests for whether the data is good or not BEFORE reading and using the data. You need to read, test, and then use (or reject) the data. Any other order leaves the program open to one bug or another.
  
  – user4581301
  Mar 9 at 4:26
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for your response. The problem is on Windows, I tested the code on Visual Studio compiler, Intel compiler and Mobile C for Android. on Android the code has no problem but on Windows it encounters to mentioned issue.
  
  – Khabarkhaan
  Mar 9 at 9:05
  

  
  
  
  

add a comment | 

I have a simple code as bellow for reading and writing contents of a unicode text file:

#include <fstream>
#include <string>
#include <vector>
#include <iostream>
using namespace std;

int main()

 std::vector<std::wstring> words;
 std::wifstream in;
 in.open("test.txt", ios_base::in);
 if (in.is_open())
 
 std::wstring word;
 while (in.good())
 
 getline(in, word);
 words.push_back(word);
 
 
 else
 cout << "Cannot open file" << endl;

 std::wofstream out;
 out.open("result.txt", ios_base::out);

 for (size_t i = 0; i < words.size(); ++i)
 
 out << words[i] << endl;
 
 out.close();
 return 0;

In the result file, at the binning of each line (except for first line), a nul character will be inserted!
Please help me what is wrong in the code.
Thanks in advance!

Update

For better expression, when the test.txt file contains as bellow:

Hi
This is a test!

the result.txt will be as this picture:
enter image description here

As can be shown from image, a nul character will appear in the text!

if using this line

out << words[i] << endl;

instead of

out.write(words[i].c_str(), words[i].size() + 1);

the problem will grow! The Chines letters will appear in the result.txt
The test text:

Hi
This is a test code!
What is wrong?

The result:
enter image description here

On Windows OS, the code compiles with Microsoft Visual Studio and Intel Compiler. Both of them have the same behavior.
But on Android, Mobile C App run the program with no problem!

Can anybody help me?

c++ getline

share|improve this question

edited Mar 9 at 9:41

Khabarkhaan

asked Mar 9 at 3:35

KhabarkhaanKhabarkhaan

13

#include <fstream>
#include <string>
#include <vector>
#include <iostream>
using namespace std;

int main()

 std::vector<std::wstring> words;
 std::wifstream in;
 in.open("test.txt", ios_base::in);
 if (in.is_open())
 
 std::wstring word;
 while (in.good())
 
 getline(in, word);
 words.push_back(word);
 
 
 else
 cout << "Cannot open file" << endl;

 std::wofstream out;
 out.open("result.txt", ios_base::out);

 for (size_t i = 0; i < words.size(); ++i)
 
 out << words[i] << endl;
 
 out.close();
 return 0;

Hi
This is a test!

out << words[i] << endl;

out.write(words[i].c_str(), words[i].size() + 1);

Hi
This is a test code!
What is wrong?

share|improve this question

edited Mar 9 at 9:41

Khabarkhaan

asked Mar 9 at 3:35

KhabarkhaanKhabarkhaan

13

share|improve this question

edited Mar 9 at 9:41

Khabarkhaan

asked Mar 9 at 3:35

KhabarkhaanKhabarkhaan

13

asked Mar 9 at 3:35

KhabarkhaanKhabarkhaan

13

asked Mar 9 at 3:35

KhabarkhaanKhabarkhaan

13