传递命令行参数 [英] Passing command line arguments

问题描述

好吧，我更新了我的代码一点，但我仍然不知道如何使用我传递的命令行参数的向量。我试图设置它像我下面的代码，但它不会编译。它给我的错误，它找不到argc和argv：

1> c：\users\chris\documents\visual studio 2008\projects\\ \\ cplusplustwo\cplusplustwo\application.h（32）：error C2065：'argc'：undeclared identifier
1> c：\users\chris\documents\visual studio 2008\projects\ cplusplustwo\cplusplustwo\application.h（32）：error C2065：'argv'：undeclared identifier

main.cpp

  #includeapplication.h
 
 int main（int argc，char * argv []）{
 vector< string& args（argv，argv + argc）; 
 return app.run（args）; 
} 
  

application.h

  #include< boost / regex.hpp> 
 #include< iostream> 
 #include< string> 
 #include< fstream> 
 #include< sstream> 
 #includetime.h
 using namespace std; 
 
 
 
类应用程序{
 private：
 //变量
 boost :: regex expression; 
 string line; 
 string pat; 
 string replace; 
 int lineNumber; 
 char date [9]; 
 char time [9]; 
 
 
 void commandLine（vector< string> args）{
 string expression =; // Expression 
 string textReplace =; // Replacement Text 
 string inputFile =; //输入文件
 string outputFile =; //输出目录
 int optind = 1; 
 //解码参数
 for（vector< string> :: iterator i = args.begin（）; i！= args.end（）; ++ i）{
 while optind  string sw = argv [optind]; 
 if（* i ==-e）{
 optind ++; 
 expression = argv [optind]; 
} 
 else if（* i ==-t）{
 optind ++; 
 textReplace = argv [optind]; 
} 
 else if（* i ==-i）{
 optind ++; 
 inputFile = argv [optind]; 
} 
 else if（* i ==-o）{
 optind ++; 
 outputFile = argv [optind]; 
} 
 else {
 cout<< 未知开关：
<< argv [optind]< 请输入正确的参数之一：\\\

<< -e + \表达式\\\\
t + \替换文本\\\\
i + \输入文件\\\\
o + \输入文件\\\\
 ; 
 optind ++; 
} 
} 
} 
} 
 //函数
 void getExpression（）{
 cout< Expression：; 
 getline（cin，pat）; 
 try {
 expression = pat; 
} 
 catch（boost :: bad_expression）{
 cout<< pat<< 不是有效的正则表达式\\\
; 
 exit（1）; 
} 
} 
 
 void boostMatch（）{
 //定义替换{仅用于测试目的！提交之前提交！ 
 replace =; 
 _strdate_s（date）; 
 _strtime_s（time）; 
 lineNumber = 0; 
 //要打开的文件
 //输入文件
 ifstream in（files / trff292010.csv）; 
 if（！in）cerr<< no file\\\
; 
 //输出文件
 ofstream newFile（files / NEWtrff292010.csv）; 
 ofstream copy（files / ORIGtrff292010.csv）; 
 ofstream report（files / REPORT.dat，ios.app）; 
 lineNumber ++; 
 while（getline（in，line））{
 lineNumber ++; 
 boost :: smatch matches; 
 copy<<线<< '\\\
'; 
 if（regex_search（line，matches，expression））{
 for（int i = 0; i< matches.size（）; ++ i）{
 report< 时间：<时间< Date：<<日期<< '\\\
'
<< Line<< lineNumber<<：<<线<< '\\\
'; 
 newFile<< boost :: regex_replace（line，expression，replace）<< \\\
; 
 
} 
} else {
 newFile<<线<< '\\\
'; 
} 
} 
} 
 
 public：
 void run（vector< string> args）{
 commandLine（vector< string& ）; 
 getExpression（）; 
 boostMatch（）; 
} 
}; 
   
 
 
 
  ORIGINAL POST  
 
 
 
我想通过命令行参数。这是高级C ++类的家庭作业。我需要传递一个向量的命令行，我不知道如果我做的一切正确。我会把它传入一个像我一样的向量吗？还有一个copy（）命令，你可以使用将命令行参数复制到向量而不是推后？
  main。 cpp 
 
 #includeapplication.h
 
 int main（int argc，char * argv []）{
 vector< string& args; 
应用程序应用程序; 
 for（int i = 1; i  args.push_back（argv [i]）; 
} 
 app.run（args）; 
 return（0）; 
} 
  
 application.h 
  #include< boost / regex.hpp> 
 #include< iostream> 
 #include< string> 
 #include< fstream> 
 #include< sstream> 
 #includetime.h
 using namespace std; 
 
类应用程序{
 private：
 //变量
 boost :: regex expression; 
 string line; 
 string pat; 
 string replace; 
 int lineNumber; 
 char date [9] 
 char time [9]; 
 
 
 void commandLine（vector< string> args）{
 string expression =; // Expression 
 string textReplace =; // Replacement Text 
 string inputFile =; //输入文件
 string outputFile =; //输出目录
 int optind = 1; 
 //解码参数
 for（vector< string> :: iterator i = args.begin（）; i！= args.end（）; ++ i）{
 while optind  string sw = argv [optind]; 
 if（* i ==-e）{
 optind ++; 
 expression = argv [optind]; 
} 
 else if（* i ==-t）{
 optind ++; 
 textReplace = argv [optind]; 
} 
 else if（* i ==-i）{
 optind ++; 
 inputFile = argv [optind]; 
} 
 else if（* i ==-o）{
 optind ++; 
 outputFile = argv [optind]; 
} 
 else {
 cout<< 未知开关：
<< argv [optind]< 请输入正确的参数之一：\\\

<< -e + \表达式\\\\
t + \替换文本\\\\
i + \输入文件\\\\
o + \输入文件\\\\
 ; 
 optind ++; 
} 
} 
} 
} 
 //函数
 void getExpression（）{
 cout< Expression：; 
 getline（cin，pat）; 
 try {
 expression = pat; 
} 
 catch（boost :: bad_expression）{
 cout<< pat<< 不是有效的正则表达式\\\
; 
 exit（1）; 
} 
} 
 
 void boostMatch（）{
 //定义替换{仅用于测试目的！提交之前提交！ 
 replace =; 
 _strdate_s（date）; 
 _strtime_s（time）; 
 lineNumber = 0; 
 //要打开的文件
 //输入文件
 ifstream in（files / trff292010.csv）; 
 if（！in）cerr<< no file\\\
; 
 //输出文件
 ofstream newFile（files / NEWtrff292010.csv）; 
 ofstream copy（files / ORIGtrff292010.csv）; 
 ofstream report（files / REPORT.dat，ios.app）; 
 lineNumber ++; 
 while（getline（in，line））{
 lineNumber ++; 
 boost :: smatch matches; 
 copy<<线<< '\\\
'; 
 if（regex_search（line，matches，expression））{
 for（int i = 0; i< matches.size（）; ++ i）{
 report< 时间：<时间< Date：<<日期<< '\\\
'
<< Line<< lineNumber<<：<<线<< '\\\
'; 
 newFile<< boost :: regex_replace（line，expression，replace）<< \\\
; 
 
} 
} else {
 newFile<<线<< '\\\
'; 
} 
} 
} 
 
 public：
 void run（vector< string> args）{
 commandLine（vector< string& ）; 
 getExpression（）; 
 boostMatch（）; 
} 
}; 
  
 
 
解决方案
我只需写：
 矢量< string> args（argv + 1，argv + argc +！argc）; 
  
这将排除 argv [0] 即使 argc == 0 （可能在Linux下，也可能是其他操作系统）。
 
Okay I have updated my code a little, but I am still not exactly sure how to use the vector of command line arguments that I pass. I tried to set it up like the code I have below, but it wont compile. It gives me the error that it cannot find argc and argv:

1>c:\users\chris\documents\visual studio 2008\projects\cplusplustwo\cplusplustwo\application.h(32) : error C2065: 'argc' : undeclared identifier
1>c:\users\chris\documents\visual studio 2008\projects\cplusplustwo\cplusplustwo\application.h(32) : error C2065: 'argv' : undeclared identifier

main.cpp
#include "application.h"

int main(int argc,char *argv[]){
    vector<string> args(argv, argv + argc);
    return app.run(args);    
}
application.h
#include <boost/regex.hpp>
#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include "time.h"
using namespace std;



class application{
private:
    //Variables
    boost::regex expression;
    string line;
    string pat;
    string replace;
    int lineNumber;
    char date[9];
    char time[9];


    void commandLine(vector<string> args){
        string  expression="";    // Expression
        string  textReplace="";   // Replacement Text
        string  inputFile="";     // Input File
        string  outputFile="";    // Output Directory
        int optind=1;
        // decode arguments
        for(vector<string>::iterator i = args.begin(); i != args.end(); ++i){
            while ((optind < argc) && (argv[optind][0]=='-')) {
                string sw = argv[optind];
                if (*i == "-e") {
                    optind++;
                    expression = argv[optind];
                }
                else if (*i == "-t") {
                    optind++;
                    textReplace = argv[optind];
                }
                else if (*i == "-i") {
                    optind++;
                    inputFile = argv[optind];
                }
                else if (*i == "-o") {
                    optind++;
                    outputFile = argv[optind];
                }
                else{
                    cout << "Unknown switch: " 
                        << argv[optind] << "Please enter one of the correct parameters:\n" 
                        << "-e + \"expression\"\n-t + \"replacement Text\"\n-i + \"Input File\"\n-o + \"Onput File\"\n";
                    optind++;
                }
            }
        }
    }
    //Functions
    void getExpression(){
        cout << "Expression: ";
        getline(cin,pat);
        try{
            expression = pat;
        }
        catch(boost::bad_expression){
            cout << pat << " is not a valid regular expression\n";
            exit(1);
        }
    }

    void boostMatch(){
        //Define replace {FOR TESTING PURPOSES ONLY!!! REMOVE BEFORE SUBMITTING!!
        replace = "";
        _strdate_s(date);
        _strtime_s(time);
        lineNumber = 0;
        //Files to open
        //Input Files
        ifstream in("files/trff292010.csv");
            if(!in) cerr << "no file\n";
        //Output Files
        ofstream newFile("files/NEWtrff292010.csv");
        ofstream copy("files/ORIGtrff292010.csv");
        ofstream report("files/REPORT.dat", ios.app);
        lineNumber++;
        while(getline(in,line)){
            lineNumber++;
            boost::smatch matches;
            copy << line << '\n';
            if (regex_search(line, matches, expression)){
                for (int i = 0; i<matches.size(); ++i){
                    report << "Time: " << time << "Date: " << date << '\n'
                        << "Line " << lineNumber <<": " << line << '\n';
                    newFile << boost::regex_replace(line, expression, replace) << "\n";

                }
            }else{
                newFile << line << '\n';
            }
        }
    }

public:
    void run(vector<string> args){
        commandLine(vector<string> args);
        getExpression();
        boostMatch();
    }
};
ORIGINAL POST

I want to pass command line arguments out of main. This is homework for an advanced C++ class.  I need to pass the command line with a vector and I am not sure if I am doing everything correctly. Would I pass it into a vector like I did? Also is there a copy() command you can use to copy the command line arguments into a vector rather than pushback?
main.cpp

#include "application.h"

int main(int argc,char *argv[]){
    vector<string> args;
    application app;
    for (int i=1;i<argc;i++){
        args.push_back(argv[i]);
    }
    app.run(args);
    return(0);
}
application.h
#include <boost/regex.hpp>
    #include <iostream>
    #include <string>
    #include <fstream>
    #include <sstream>
    #include "time.h"
    using namespace std;

class application{
private:
    //Variables
    boost::regex expression;
    string line;
    string pat;
    string replace;
    int lineNumber;
    char date[9];
    char time[9];


    void commandLine(vector<string> args){
        string  expression="";    // Expression
        string  textReplace="";   // Replacement Text
        string  inputFile="";     // Input File
        string  outputFile="";    // Output Directory
        int optind=1;
        // decode arguments
        for(vector<string>::iterator i = args.begin(); i != args.end(); ++i){
            while ((optind < argc) && (argv[optind][0]=='-')) {
                string sw = argv[optind];
                if (*i == "-e") {
                    optind++;
                    expression = argv[optind];
                }
                else if (*i == "-t") {
                    optind++;
                    textReplace = argv[optind];
                }
                else if (*i == "-i") {
                    optind++;
                    inputFile = argv[optind];
                }
                else if (*i == "-o") {
                    optind++;
                    outputFile = argv[optind];
                }
                else{
                    cout << "Unknown switch: " 
                        << argv[optind] << "Please enter one of the correct parameters:\n" 
                        << "-e + \"expression\"\n-t + \"replacement Text\"\n-i + \"Input File\"\n-o + \"Onput File\"\n";
                    optind++;
                }
            }
        }
    }
    //Functions
    void getExpression(){
        cout << "Expression: ";
        getline(cin,pat);
        try{
            expression = pat;
        }
        catch(boost::bad_expression){
            cout << pat << " is not a valid regular expression\n";
            exit(1);
        }
    }

    void boostMatch(){
        //Define replace {FOR TESTING PURPOSES ONLY!!! REMOVE BEFORE SUBMITTING!!
        replace = "";
        _strdate_s(date);
        _strtime_s(time);
        lineNumber = 0;
        //Files to open
        //Input Files
        ifstream in("files/trff292010.csv");
            if(!in) cerr << "no file\n";
        //Output Files
        ofstream newFile("files/NEWtrff292010.csv");
        ofstream copy("files/ORIGtrff292010.csv");
        ofstream report("files/REPORT.dat", ios.app);
        lineNumber++;
        while(getline(in,line)){
            lineNumber++;
            boost::smatch matches;
            copy << line << '\n';
            if (regex_search(line, matches, expression)){
                for (int i = 0; i<matches.size(); ++i){
                    report << "Time: " << time << "Date: " << date << '\n'
                        << "Line " << lineNumber <<": " << line << '\n';
                    newFile << boost::regex_replace(line, expression, replace) << "\n";

                }
            }else{
                newFile << line << '\n';
            }
        }
    }

public:
    void run(vector<string> args){
        commandLine(vector<string> args);
        getExpression();
        boostMatch();
    }
};

解决方案
I'd just write:
vector<string> args(argv + 1, argv + argc + !argc);
This will exclude argv[0], but in a way that's robust even if argc == 0 (possible under Linux, and maybe other OSs too).

                        
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