cstdio QT C++

[nhs_0702]

#ifndef READWRITEFILE_H
#define READWRITEFILE_H
 
#include <string>
#include <iostream>
#include <fstream>
#include <assert.h>
#include <vector>
//#include <stdlib.h>
 
#include "../Misc.h"
 
using namespace std;
 
/*!
This class can be written to a file or read from a file.
*/
class InfoReadWrite
{
    public:
    InfoReadWrite();
 
    //!Read the class from a file
    void Read(string filename);
 
    //!Write the class to a file
    void Write(string filename);
 
    //!Returns the expected data
    vector<float> getData();
 
    //!Saves the members to a file
    void setData(vector<float> in);
 
    //!Returns the timestamp of the file read.
    string get_timestamp();
 
    private:
 
    //!Loads the whole file in a string
    string load_txt(string filename_in);
 
    //!Save a string in a file
    void save_txt(string filename_out, string out);
 
    /*!
    mess_in = a message
    left    = the left separator
    left    = the right separator
    ...will give the last occurence of the match
    */
    string find_subs_between(string mess_in, string left, string right);
 
    //Data that is read/written
    float DeviceNo;
    float DownloadB;
    float UploadB;
    string Timestamp;
};
 
#endif

#ifndef READWRITEFILE_H
#define READWRITEFILE_H

#include <string>
#include <iostream>
#include <fstream>
#include <assert.h>
#include <vector>
//#include <stdlib.h>

#include "../Misc.h"

using namespace std;

/*!
This class can be written to a file or read from a file.
*/
class InfoReadWrite
{
    public:
    InfoReadWrite();

    //!Read the class from a file
    void Read(string filename);

    //!Write the class to a file
    void Write(string filename);

    //!Returns the expected data
    vector<float> getData();

    //!Saves the members to a file
    void setData(vector<float> in);

    //!Returns the timestamp of the file read.
    string get_timestamp();

    private:

    //!Loads the whole file in a string
    string load_txt(string filename_in);

    //!Save a string in a file
    void save_txt(string filename_out, string out);

    /*!
    mess_in = a message
    left    = the left separator
    left    = the right separator
    ...will give the last occurence of the match
    */
    string find_subs_between(string mess_in, string left, string right);

    //Data that is read/written
    float DeviceNo;
    float DownloadB;
    float UploadB;
    string Timestamp;
};

#endif

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i:\programfiles\qtcreator4_62\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:165: error: '::snprintf' has not been declared
i:\programfiles\qtcreator4_62\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:168: error: '::vsnprintf' has not been declared
i:\programfiles\qtcreator4_62\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:176: error: '__gnu_cxx::snprintf' has not been declared
i:\programfiles\qtcreator4_62\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:179: error: '__gnu_cxx::vsnprintf' has not been declared

why error ?

[squidge]

Why are you using C i/o function in a C++ project?

snprintf is part of stdio.h

[xlink]

After speding most of my day trying to figure this out i found that changing "#include <fstream>" to #"include <stdio.h>" fixed it.. in case somebody else has this problem.

[Touna]

I have the same error like you and when changing the #include the problem is not solved and have this errors that appear:

..\Projet\mythread.cpp:80: error: aggregate 'std::ifstream file' has incomplete type and cannot be defined

..\Projet\mythread.cpp:82: error: incomplete type 'std::ifstream' used in nested name specifier

Please how can i solve this? Thanks

[wysota]

These are not the same:

i:\programfiles\qtcreator4_62\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:165: error: '::snprintf' has not been declared
i:\programfiles\qtcreator4_62\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:168: error: '::vsnprintf' has not been declared
i:\programfiles\qtcreator4_62\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:176: error: '__gnu_cxx::snprintf' has not been declared
i:\programfiles\qtcreator4_62\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:179: error: '__gnu_cxx::vsnprintf' has not been declared

..\Projet\mythread.cpp:80: error: aggregate 'std::ifstream file' has incomplete type and cannot be defined
..\Projet\mythread.cpp:82: error: incomplete type 'std::ifstream' used in nested name specifier

The solution to your problem is to #include <ifstream>.

[Touna]

I started with including #include <ifstream>
But I have these errors:

c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:165: error: '::snprintf' has not been declared  
 
c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:168: error: '::vsnprintf' has not been declared  
 
c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:176: error: '__gnu_cxx::snprintf' has not been declared  
 
c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:179: error: '__gnu_cxx::vsnprintf' has not been declared

c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:165: error: '::snprintf' has not been declared  
  
c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:168: error: '::vsnprintf' has not been declared  
  
c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:176: error: '__gnu_cxx::snprintf' has not been declared  
  
c:\qt\2010.05\mingw\bin\../lib/gcc/mingw32/4.4.0/include/c++/cstdio:179: error: '__gnu_cxx::vsnprintf' has not been declared

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[wysota]

Great. Now include stdio.h as well.

[Touna]

I have included this after reading this post

After speding most of my day trying to figure this out i found that changing "#include <fstream>" to #"include <stdio.h>" fixed it.. in case somebody else has this problem.

but have the followinf errors:

..\Projet\mythread.cpp:80: error: aggregate 'std::ifstream file' has incomplete type and cannot be defined

..\Projet\mythread.cpp:82: error: incomplete type 'std::ifstream' used in nested name specifier

[wysota]

So you have both stdio.h and ifstream included and you get that error?

[Touna]

I have resolved this but using QTextStream
Thanks!!!

[d_stranz]

I have resolved this but using QTextStream

In other words, you really have no clue what you were doing wrong, despite everyone here telling you exactly what was needed. You'll become a much better programmer if you start trying to understand problems instead of trying things at random until something finally works.

[Touna]

You are right understanding errors is important but I'm pressed by time, I have a project that should be delivered in May, that's why i have no more time to spend on this

[wysota]

And because of this time pressure you spent 5 days on a problem that could have been solved in 5 seconds. That would leave you with 119 hours, 59 minutes and 55 seconds of time to spend on learning to solve problems such as this one.

[Touna]

I'm sorry to tell you that the mathematic operation that you have done is wrong
posted on 20th April 15:49 and the problem is resolved at 17:52 for the same day
thus i spended 2 hours 3 min to solve the problem

[wysota]

That's still 2 hours and 3 minutes too much. And you didn't solve the problem. You worked around it. The difference between a solution and a workaround is that in the latter situation the issue is likely to arise again.