C++如何獲取文本文件的特定行

Question

因此，我正在編寫一個用戶文件創建，並且到目前爲止，但我堅持如何獲取文本中的特定行並在該行中使用該變量程序。

int Player::CheckAccount() 
{ 
    Network net; 

    bool fileFound = false; 
    string user = GetLoginUser(); 
    string openDir = "./Characters/" + user + "/" + user + ".ini"; 

    if (fileFound == false) { 
     ifstream openFile(openDir); 
     if (openFile.good()) { 
      util::Logger::Dbg("File found for user " + user); 
      openFile.open(openDir); 
      util::Logger::Dbg("User file " + user + " is ready to be checked"); 
      fileFound = true; 
     } else { 
      util::Logger::Dbg("Could not find user file for " + user + " creating new character file"); 
      CreateAccount(GetLoginUser()); 
     } 
    } 
    return net.GetFinalSize() == 1; 
} 

void Player::CreateAccount(string user) 
{ 
    string dir = "./Characters/" + user; 

    if(CreateDirectory(dir.c_str(), NULL)) { 
     util::Logger::Dbg("Created new user directory for " + user); 
    } else { 
     util::Logger::Dbg("Could not create new user directory for " + user); 
    } 

    string fileName = user + ".ini"; 

    ofstream createUser; 

    string charDir = "./Characters/" + user + "/" + fileName; 

    createUser.open(charDir); 

    SetPlayerBanned(false); 
    SetInAppUsername(user); 

    createUser << "Username = " << GetLoginUser() << endl; 
    createUser << "Password = " << GetLoginPass() << endl; 
    createUser << "app Username = " << GetInAppUsername() << endl; 
    createUser << "Status = " << GetStatus() << endl; 
    createUser << "Bio = " << GetBio() << endl; 
    createUser << "Banned status = " << IsPlayerBanned() << endl; 
    createUser << "Avatar dir = " << GetAvatarDir() << endl; 

    createUser.close(); 
} 

所以在checkaccount功能我希望能夠從中提取這將是一個布爾banstatus文本文檔的變量。雖然我不想做的是必須使用外部庫，我希望能夠從Windows直接做到這一點。

Answer 1

這是我分析我的配置文件：

int config::Parse(void) 
{ 
    std::ifstream cfile("file.conf"); 

    if(! cfile.is_open()) Util::Error(ErrorNum::NoFileOpen, confile, __func__); 

    str line = ""; 
    std::regex rxlognum("("Blah: ")(.*)"); // "Blah: " is what you want to name the variable 
    std::smatch rxm; 

    while(getline(cfile, line)) 
    { 
     if(std::regex_match(line, rxm, rxlognum)) 
     { 
      TheVariable = rxm[2]; 
      break; 
     } 
    } 

    cfile.close(); 

    return 0; 
}