C++ | Zurück mit den Dateien wieder

Question

Hier bin ich wieder Jungs, verloren in der Komplexität der Datei arbeiten. Also hier ist mein Programm:

{alt für no-whiny}

#include <iostream> 
#include <string> 
#include <cstdlib> 
#include <windows.h> 
#include <stdexcept> 
#include <limits> 
#include <Lmcons.h> 
#include <fstream> 
#include <stdio.h> 
using namespace std; 


void out(string x){x+="\n";cout<<x;} 
void outn(){out("");} 
void delay(int x){Sleep(x);} 
void delayS(int x){Sleep(x*1000);} 
void cs(){std::system("cls");} 
void UserName(string *x){char username[UNLEN + 1]; 
    DWORD size = UNLEN + 1; 
    GetUserName(username, &size); 
    string transition(username);*x=transition;} 
//use this syntax in main : string username;UserName(&username); 


//main in case you ain't noticed 
int main() 
{ 
    //getting username 
    string username; 
    UserName(&username); 
    /*out(username);*/ 


    //init 
    const string namefile="preferences.txt"; 
    string path; 
    const string beginning="C:\\Users\\"; 
    const string ending="\\AppData\\Roaming\\Processing\\"; 

    //path init 
    path+=beginning; 
    path+=username; 
    path+=ending; 

    string path2; 
    path2=path; 
    path2+="new.txt"; 
    string filename2="new.txt"; 

    path+=namefile; 


    //new lines init 
    string line76="proxy.http.host=proxy-eple.in.ac-nantes.fr"; 
    string line77="3128"; 
    string line78="proxy.https.host=proxy-eple.in.ac-nantes.fr"; 
    string line79="3128"; 
    string line80="proxy.socks.host=proxy-eple.in.ac-nantes.fr"; 
    string line81="3128"; 


    //files init 
    fstream file; 
    //fstream newfile; 
    ofstream newfile(path2.c_str()); 


    //main try-catch process 
    try{ 
     file.open(path.c_str() ,ios::in); 
     if(!file.is_open()){throw 404;} 
     //procédure de modif 
     else{ 
      file.close(); 

      //file manipulation 
      file.open(path.c_str()); 
      try{newfile.open(path2.c_str(),ios::out|ios::trunc); 
      if(!newfile.is_open()){throw 404;}} 
      catch(int x){cout<<"Error "<<x<<" : failed to open file \\new.txt\\";} 

      for (unsigned int i = 1; i < 76; i++) 
      { 
       std::string text; 
       getline(file, text); 
       newfile << text <<endl; 
      } 
      newfile << line76 <<endl; 
      newfile << line77 <<endl; 
      newfile << line78 <<endl; 
      newfile << line79 <<endl; 
      newfile << line80 <<endl; 
      newfile << line81 <<endl; 
      for (unsigned int i = 82; i < 97; i++) 
      { 
       std::string text; 
       std::getline(file, text); 
       newfile << text <<endl; 
      } 
      newfile << ""; 
     } 


     //end of file manipulation 
     file.close();newfile.close(); 
     string old1 = beginning+username+ending+"old_pref.txt"; 


     //renaming process 

     //rename preferences.txt to old_pref.txt 
     try{int rf=rename(path.c_str(),old1.c_str()); 
      if(rf!=0){throw 911;}} 
     //1st catch in case you ain't noticed 
     catch(int x){cout<<"Error "<<x<<" : Failed to rename to \\old_pref.txt\\";} 
     //end of 1st catch 

     //rename new.txt to preferences.txt 
     try{int rf2=rename(path2.c_str(),path.c_str()); 
      if(rf2!=0){throw 911;}} 

     //2nd catch in case you ain't noticed 
     catch(int x){ 
      cout<<"Error "<<x<<" : Failed to rename to \\preferences.txt\\";} 
     //end of 2nd catch 

     //ending process 
     cs();out("done !");}//end of main try 

    //main catch 
    catch(int x){ 
     cout<<"Error "<<x<<" : failed to open file \\preferences.txt\\";} 
    //end of main catch 

    return 0; 
} //end of main 

{/ alt ohne whiny}

{für whiny (PS: Ja, ich interessiere mich nicht über Bibliotheken wie Sie kümmern sich nicht um Respekt) (wie kommen: unleserlich, nicht-parsable wie ... Brille bekommen und Chill-out)}

#include <iostream> 
#include <string> 
#include <cstdlib> 
#include <windows.h> 
#include <stdexcept> 
#include <limits> 
#include <Lmcons.h> 
#include <fstream> 
#include <stdio.h> 


using namespace std; 


void out(string x) 
{ 
    x+="\n"; 
    cout<<x; 
} 
void outn() 
{ 
    out(""); 
} 
void delay(int x) 
{ 
    Sleep(x); 
} 
void delayS(int x) 
{ 
    Sleep(x*1000); 
} 
void cs() 
{ 
    std::system("cls"); 
} 
void UserName(string *x) 
{ 
    char username[UNLEN + 1]; 
    DWORD size = UNLEN + 1; 
    GetUserName(username, &size); 
    string transition(username); 
    *x=transition; 
} 
//use this syntax in main : string username;UserName(&username); 



int main() 
{ 


    string username; 
    UserName(&username); 
    /*out(username);*/ 


    const string namefile="preferences.txt"; 


    string path; 

    const string beginning="C:\\Users\\"; 
    const string ending="\\AppData\\Roaming\\Processing\\"; 

    path+=beginning; 
    path+=username; 
    path+=ending; 

    string path2; 
    path2=path; 
    path2+="new.txt"; 
    string filename2="new.txt"; 

    path+=namefile; 



    string line76="proxy.http.host=proxy-eple.in.ac-nantes.fr"; 
    string line77="3128"; 
    string line78="proxy.https.host=proxy-eple.in.ac-nantes.fr"; 
    string line79="3128"; 
    string line80="proxy.socks.host=proxy-eple.in.ac-nantes.fr"; 
    string line81="3128"; 


    fstream file; 
    //fstream newfile; 
    ofstream newfile(path2.c_str()); 

    try 
    { 
     file.open(path.c_str(),ios::in); 
     if(!file.is_open()) 
     { 
      throw 404; 
     } 
     //procédure de modif 
     else 
     { 
      file.close(); 

      file.open(path.c_str()); 
      try 
      { 
       newfile.open(path2.c_str(),ios::out|ios::trunc); 
       if(!newfile.is_open()) 
       { 
        throw 404; 
       } 
      } 
      catch(int x) 
      { 
       cout<<"Error "<<x<<" : failed to open file \\new.txt\\"; 
      } 

      for (unsigned int i = 1; i < 76; i++) 
      { 
       std::string text; 
       getline(file, text); 
       newfile << text <<endl; 
      } 
      newfile << line76 <<endl; 
      newfile << line77 <<endl; 
      newfile << line78 <<endl; 
      newfile << line79 <<endl; 
      newfile << line80 <<endl; 
      newfile << line81 <<endl; 
      for (unsigned int i = 82; i < 97; i++) 
      { 
       std::string text; 
       std::getline(file, text); 
       newfile << text <<endl; 
      } 
      newfile << ""; 

     } 

     file.close(); 
     newfile.close(); 
     string old1 = beginning+username+ending+"old_pref.txt"; 

     try 
     { 
      int rf=rename(path.c_str(),old1.c_str()); 
      if(rf!=0) 
      { 
       throw 911; 
      } 
     } 
     catch(int x) 
     { 
      cout<<"Error "<<x<<" : Failed to rename to \\old_pref.txt\\"; 
     } 
     try 
     { 
      int rf2=rename(path2.c_str(),path.c_str()); 
      if(rf2!=0) 
      { 
       throw 911; 
      } 
     } 
     catch(int x) 
     { 
      cout<<"Error "<<x<<" : Failed to rename to \\preferences.txt\\"; 
     } 


     cs(); 
     out("done !"); 
    } 
    catch(int x) 
    { 
     cout<<"Error "<<x<<" : failed to open file \\preferences.txt\\"; 
    } 


    return 0; 
} 

{/ for whiny (PS: denken Sie, ich Vertiefung noch Pflege ?)}

In Ordnung, hier ist mein Problem: Es öffnet die Datei, es erstellt die neue.txt und öffnet es, es ist nicht füllen Sie die new.txt und dann zum Umbenennen Prozess.

Warum schreibt es nicht auf die neue Datei? Wie soll ich das nochmal machen, damit es auf die neue Datei schreibt?

EDIT: Ich benutze Codeblöcke 16,01

Answer 1

ofstream newfile(path2.c_str()); 

Die neue Datei hier erstellt wird. Und dann später:

newfile.open(path2.c_str(),ios::out|ios::trunc); 

Hier wird ein Versuch unternommen, die gleiche Datei ein zweites Mal zu erstellen. Die Datei ist bereits erstellt und geöffnet. Ein Versuch, das bereits geöffnete Objekt std::ofstream zu öffnen, ist ein Fehler, und das Objekt std::ofstream befindet sich jetzt in einem Fehlerzustand.

Mit dem Objekt im Fehlerzustand schlagen alle nachfolgenden Versuche fehl, in das Stream-Objekt zu schreiben.

Lösung: Erstellen Sie die Datei einmal, nicht zweimal.

Answer 2

Hier ist die korrigierte Code für diejenigen, die interessiert sein würde:

#include <iostream> 
#include <string> 
#include <cstdlib> 
#include <windows.h> 
#include <stdexcept> 
#include <limits> 
#include <Lmcons.h> 
#include <fstream> 
#include <stdio.h> 

using namespace std; 


void out(string x) 
{ 
    x+="\n"; 
    cout<<x; 
} 
void outn() 
{ 
    out(""); 
} 
void delay(int x) 
{ 
    Sleep(x); 
} 
void delayS(int x) 
{ 
    Sleep(x*1000); 
} 
void cs() 
{ 
    std::system("cls"); 
} 
void UserName(string *x) 
{ 
    char username[UNLEN + 1]; 
    DWORD size = UNLEN + 1; 
    GetUserName(username, &size); 
    string transition(username); 
    *x=transition; 
} 
//use this syntax in main : string username;UserName(&username); 



int main() 
{ 


    string username; 
    UserName(&username); 
    /*out(username);*/ 


    const string namefile="preferences.txt"; 


    string path; 

    const string beginning="C:\\Users\\"; 
    const string ending="\\AppData\\Roaming\\Processing\\"; 

    path+=beginning; 
    path+=username; 
    path+=ending; 

    string path2; 
    path2=path; 
    path2+="new.txt"; 
    string filename2="new.txt"; 

    path+=namefile; 



    string line76="proxy.http.host=proxy-eple.in.ac-nantes.fr"; 
    string line77="proxy.http.port=3128"; 
    string line78="proxy.https.host=proxy-eple.in.ac-nantes.fr"; 
    string line79="proxy.https.port=3128"; 
    string line80="proxy.socks.host=proxy-eple.in.ac-nantes.fr"; 
    string line81="proxy.socks.port=3128"; 


    fstream file; 
//fstream newfile; 
    ofstream newfile/*(path2.c_str())*/; 

    try 
    { 
     file.open(path.c_str(),ios::in); 
     if(!file.is_open()) 
     { 
      throw 404; 
     } 
     //procédure de modif 
     else 
     { 
      file.close(); 

      file.open(path.c_str()); 
      try 
      { 
       newfile.open(path2.c_str(),ios::out|ios::trunc); 
       if(!newfile.is_open()) 
       { 
        throw 404; 
       } 
      } 
      catch(int x) 
      { 
       cout<<"Error "<<x<<" : failed to open file \\new.txt\\"; 
      } 

      for (unsigned int i = 1; i < 76; i++) 
      { 
       std::string text; 
       getline(file, text); 
       newfile << text <<endl; 
      } 
      newfile << line76 <<endl; 
      newfile << line77 <<endl; 
      newfile << line78 <<endl; 
      newfile << line79 <<endl; 
      newfile << line80 <<endl; 
      newfile << line81 <<endl; 

      //because we still need it to roll through the file before copying 
      for(unsigned int i=76; i<82; i++) 
      { 
       std::string text; 
       std::getline(file,text); 
      } 

      for (unsigned int i = 82; i < 97; i++) 
      { 
       std::string text; 
       std::getline(file, text); 
       newfile << text <<endl; 
      } 
      newfile << ""; 

     } 

     file.close(); 
     newfile.close(); 
     string old1 = beginning+username+ending+"old_pref.txt"; 

     try 
     { 
      int rf=rename(path.c_str(),old1.c_str()); 
      if(rf!=0) 
      { 
       throw 911; 
      } 
     } 
     catch(int x) 
     { 
      cout<<"Error "<<x<<" : Failed to rename to \\old_pref.txt\\"; 
     } 
     try 
     { 
      int rf2=rename(path2.c_str(),path.c_str()); 
      if(rf2!=0) 
      { 
       throw 911; 
      } 
     } 
     catch(int x) 
     { 
      cout<<"Error "<<x<<" : Failed to rename to \\preferences.txt\\"; 
     } 


     cs(); 
     out("done !"); 
    } 
    catch(int x) 
    { 
     cout<<"Error "<<x<<" : failed to open file \\preferences.txt\\"; 
    } 


    return 0; 
}