很难在我的 C++ 程序中激活我的命令标志

Question

做一个项目分配，我似乎无法让我的命令标志工作。一直在网上寻求帮助，但在这个问题上找不到太多。我的老师从来没有解释过这是什么或怎么做，所以我只是根据我在网上找到的东西做事。任何解决方案或解释将不胜感激。

#include<fstream>
#include<iostream>
#include<vector>
#include<sstream>

using namespace std;

int main(int argc, char *argv[])
{
    if(argc != 0)
        {
            for (int i = 0; i < argc; i++)
            {
                ifstream file1(argv[i]);
                string arg1 = argv[i];
                int counter = 0;
                int counter2 = 0;
                string longest, word;
                char letter;
                vector<string> arrayWord, numString;
                vector<int> largestNum;
                stringstream ss;

             if(file1.is_open() == false)
               {
                 cout << "File Not Found\n";
                 continue;
               }
             else if (arg1 == "c")
               {
                    while (!file1.eof())
                    {
                        letter = file1.get();

                        if(letter != ' ')
                        {
                            word = word + letter;
                            letter = file1.get();
                            counter++;
                        }
                        else if (letter == ' ')
                        {
                            arrayWord[counter2] = word;
                            largestNum[counter2] = counter;
                            ss << largestNum[counter2];

                            numString[counter2] = ss.str();

                            counter2++;
                            word.clear();
                        }
                    }
                    longest = arrayWord[0];
                    for (int i = 0; i <= counter2; i++)
                    {
                        if (largestNum[counter2] < largestNum[counter2 + 1])
                        {
                            longest = arrayWord[counter2 + 1] + "(" + numString[counter2 + 1];
                        }
                        else if (largestNum[counter2] == largestNum[counter2 + 1])
                        {
                            longest = longest + "(" + (numString[counter2 + 1]) + ", " + arrayWord[counter2 + 1] + "(" + numString[counter2 + 1];
                        }
                        else
                        {
                            longest = arrayWord[counter2] + "(" + numString[counter2];
                        }
                    }
                    cout << longest << endl;
                    continue;
                }
                else
                {
                    cout << "Program is running with an invalid command" << endl;
                    continue;
                }
            }
        }
    return 0;
}

Answer 1

在我看来，您正在尝试对命令行上的每个项目运行相同的功能。

我强烈建议将您的实际功能拆分为一个单独的函数 (process_file)，然后您可以遍历参数并运行您的功能。

注意：我们从argv[1] 开始，因为argv[0] 是用户在命令行上键入以获取您的程序的任何内容。这通常类似于./my-program，假设用户输入了./my-program file1.txt file2.txt

以下示例将在每个文件上运行您的功能。

int main(int argc, char ** argv){
    int i;
    for ( i = 1; i < argc; i++){
        printf("Processing \"%s\":\n", argv[i]);
        process_file(argv[i]);
    }
}