Config from Network Stream
What changes would be needed to load the config from a different source, like a network stream, instead of a file?
Loading a configuration from a network stream instead of a file involves a few key changes. The main difference is how we initially get the data into a std::string. Instead of using SDL_RWFromFile(), we'll need functions to receive data over the network.
Network Communication
For network communication, we might use libraries like SDL_net or platform-specific APIs. For simplicity, let's assume we have a hypothetical function ReceiveNetworkData that can read data from a network stream and return it as a std::string.
Adapting ReadFile()
Our original ReadFile() function used SDL_RWops to read from a file. We'll need a new function, let's call it ReadNetworkData(), that uses our network function to get the data.
We'll also update our Load function
#include <iostream>
#include <string>
// Hypothetical function - implementation
// depends on your network library
std::string ReceiveNetworkData() {
return "WINDOW_TITLE: Networked Window\n"
"WINDOW_WIDTH: 800";
}
class Config {
public:
std::string WindowTitle;
int WindowWidth;
void Load(const std::string& Path) {
std::string Content{ReadFile(Path)};
if (Content.empty()) return;
ParseConfig(Content);
}
void LoadFromNetwork() {
std::string Content{ReadNetworkData()};
if (Content.empty()) return;
ParseConfig(Content);
}
void ParseConfig(const std::string& Content) {
size_t Start{ 0 };
size_t End{ Content.find('\n', Start) };
while (End != std::string::npos) {
ProcessLine(Content.substr(
Start, End - Start));
Start = End + 1;
End = Content.find('\n', Start);
}
ProcessLine(Content.substr(Start));
}
void ProcessLine(const std::string& Line) {
size_t Delim{ Line.find(": ") };
if (Delim == std::string::npos) return;
std::string Key{ Line.substr(0, Delim) };
std::string Value{ Line.substr(Delim + 2) };
if (Key == "WINDOW_TITLE") {
WindowTitle = Value;
}
else if (Key == "WINDOW_WIDTH") {
WindowWidth = std::stoi(Value);
}
}
private:
std::string ReadFile(const std::string& Path) {
return ""; // Not used in this example
}
std::string ReadNetworkData() {
return ReceiveNetworkData();
}
};
int main() {
Config C;
C.LoadFromNetwork();
std::cout << C.WindowTitle << "\n";
std::cout << C.WindowWidth << "\n";
}Networked Window
800Other Considerations
- Error Handling: Network communication is more prone to errors than local file reading. You'll need robust error handling to manage timeouts, disconnects, and other network issues.
- Buffering: Network data might arrive in chunks. You might need to buffer the incoming data until you have a complete configuration.
- Protocol: You'll need a defined protocol to ensure that both the sender and receiver understand how the configuration data is structured and transmitted over the network.
Parsing Data using std::string
Learn how to read, parse, and use config files in your game using std::string and SDL_RWops