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I don’t know how to implement reading data and put it into the structure
There is a config.txt file, it stores data like
someBigText=ASDSDdasdsa (can be more +1000 simbol)
isOkay=true
myAge=24
struct Config {
std::string Name;
std::string StringValue;
};
assuming your config is splitted in sections like:
[myImportantSection]
someBigText = "foo tha can be more +1000 simbols"
isOkay = true
myAge = 24
and assuming you are using boost:
#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/ini_parser.hpp>
boost::property_tree::ptree myPtree;
boost::property_tree::ini_parser::read_ini("config.txt", myPtree);
auto text{myPtree.get<std::string>("myImportantSection.someBigText")};
auto isOk{myPtree.get<bool>("myImportantSection.isOkay")};
auto age{myPtree.get<int>("myImportantSection.myAge")};
struct Config
{
std::string text{};
bool ok{false};
int age{0};
};
Config myConfig;
myConfig.text = text;
myConfig.ok = isOk;
myConfig.age = age;
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I don't fully understand nor did i find anything online about this topic but this code(cut down so it wont be 500 lines of code):
class Character{
public:
int MaxHP;
int currentHP;
currentHP = MaxHP;
int getHP()
{
return CurrentHP;
}
Character(int h){
maxHP=h
};
~Character(){};
};
int main()
{
Character warrior(300)
cout<<getHP();
return 0;
};
maxHP = 300
CurrentHP = -875000
now trying to acces the value of currentHP i get -87878....
My question is what is the problem?
If you wish to initialize a private variable it's better done in a constructor:
class Character{
private:
int MaxHP;
int currentHP;
public:
Character() : MaxHP(0), currentHP(MaxHP){}
}
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I'm writing a class that reads data from a file. The project is still in development, and it's likely that I'll change the file name or path later on, so I've stored it in a std::string for quicker editing.
Given that the file name is going to be used several times in a function, but is only going to be used in one function, is there a canonical cpp rule about where I should define the variable?
//don't know where I'll define this
std::string file_name = "path/to/file.foo";
//a.h file
class A {
public:
void fileFunc();
private:
//do i define it here?
};
//a.cpp file
A::fileFunc() {
//or do i define it here?
std::ifstream in(file_name);
if(in) {
//do things
}
else {
std::cerr << "couldn't open " << file_name;
}
}
Keeps all information close to thiers use.
It will help the readability and the performance. See: https://en.wikipedia.org/wiki/Locality_of_reference
So
A::fileFunc() {
const std::string file_name = "path/to/file.foo"; // pls use const when you can
...
or
A::fileFunc(const std::string& file_name) {
...
BTW, I think this should be on https://codereview.stackexchange.com/, not stackoverflow.
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Hi I dnt have any knowledge on Multithreading or Parallel programing.
I need to load multiple file for an application, in which the load time does not affect the application or response to user.
I used CreateThread with that I cannot able to load data to a class variable.
Any guidance of how to do this in VC++ will be a great help.
Thanks in Advance !!
For example,
My application is streaming content meantime I need to load a big image to to class variable (Bitmap), which should not affect the streaming i.e without pause.
Modern C++ allows you to use hi level abstract features such as std::future:
struct Data {
// file name just for info
std::string file_name;
// here is data from file ...
static Data load(const std::string& name) {
Data data{ name };
// todo load from file
return std::move(data);
}
};
std::vector<std::string> names = { "file1.txt", "file2.txt", "file3.txt" };
std::vector<std::future<Data>> results;
for (const auto& name : names) {
// load from the name file asynchronously
auto future = std::async(std::launch::async, &Data::load, std::ref(name));
results.emplace_back(future);
}
// gather result
for (auto& future : results) {
Data& data = future.get();
// todo use data from the file object
}
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Can someone please point me to an explanation what e.g. QIODevice::WriteOnly actually does?
full line of code:
file.open(stderr, QIODevice::WriteOnly);
from that link
thanks
According to the documentation for the QIODevice class, WriteOnly is as enum constant with value 2. It indicates that the device is open for writing.
I believe that the following example for enum hack will be useful to you.
class MyClass1 {
public:
enum { SIZE=10 };
};
class MyClass2 {
public:
enum { SIZE=20 };
};
int main() {
cout << MyClass1::SIZE << "\t" << MyClass2::SIZE << endl;
}
QIODevice::WriteOnly is just a flag, you're saying that you want to open the file only for writing.
If you would want only to read the file, QIODevice::ReadOnly would be the necessary flag to use.
And to read and write use flag: QIODevice::ReadWrite:
file.open(stderr, QIODevice::ReadWrite);
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How do i write it in c++ ??
// in PAWN ( Procedural Language )
enum e_player_data
{
id, // Integer
username[24] // string
};
new PlayerData[50][e_player_data];
/*
so i can access it like PlayerData[1][id] = 1; or PlayerData[1][username] = "Firstname_Lastname";
*/
Can someone code it to c++ for me?
You can use a std::map:
typedef std::map<int,std::string> Player;
Player p;
// add a player:
int id = 0;
p[id] = "Max Power";
As tobi303 wrote in the comment, you can use a std::map to accomplish this.
struct e_player_data
{
int id,
std::string username
};
std::map<int,e_player_data> PlayerData;
PlayerData[1].id = 1;
PlayerData[2].username = "Firstname_Lastname";