CODEWITHSUNDEEP
c++wrapper
user1420
user1420

Reputation: 143

How to create a C++ wrapper class for the following kind of C program?

I have created simple C++ wrapper classes before but my current problem is a bit confusing. I have a custom piece of hardware that can connected to a USB port and it gives out certain information depending on the configuration of the hardware based on which different event handlers are executed. It uses Ethernet-over-USB protocol. The C code on the PC side looks like this:

// Relevant headers

int Event1handler(){
  // Code to process event 1
}

void Event2handler(){
  // Code to process event 2
}

int main(void){
    // Code to setup calls to Event1handler() and Event2handler() using Open Sound Control methods
}

Now I am confused how to wrap a C++ class around the above code. In the C program, the event handlers are called automatically depending on what information is coming from the USB. How would I implement the event handlers as methods of a class that are automatically called depending on the information the hardware is sending? Can I put the contents of the main() function into the constructor of the class?

Edit: I do not need separate methods for the class. I just need to wrap the C program into a class. Putting all the event handlers into a single method is also fine (if its possible at all). I just need the data that each event handler receives.

Edit2: Here is what the actual event handlers and calls look like using OpenSoundControl:

// Relevant headers

int Event1handler(const char *path, const char *types, lo_arg **argv, int argc, void *data, void user_data){
  // Code to process event 1
}

void Event2handler(const char *path, const char *types, lo_arg **argv, int argc, void *data, void user_data){
  // Code to process event 2
}

int main(void){
    // Code to setup calls to Event1handler() and Event2handler() using Open Sound Control methods
    lo_server_thread st;
    // "if" means one integer and one float
    lo_server_thread_add_method(st, "/folder/data1", "if", Event1handler, NULL);
    lo_server_thread_add_method(st, "/folder/data2", "if", Event2handler, NULL);
}

Upvotes: 1

Views: 1813

Answers (1)

user2205930
user2205930

Reputation: 1086

Just create a class and put the code inside, for example in your .h file:

class EventWrapper
{
public:
   EventWrapper();
   static int Event1Handler();
   static void Event2Handler();
}

Then in your .cpp file:

#include "EventWrapper.h"
// Include relevant headers for your USB device

EventWrapper::EventWrapper()
{
   // Code to setup calls to Event1handler() and Event2handler()
   // using Open Sound Control methods.
}

int EventWrapper::Event1Handler()
{
   // Code to process event 1
}

void EventWrapper::Event2Handler()
{
   // Code to process event 2
}

Without knowing all of the details of your program you may have to play around with what is static and how you want to handle it.

Upvotes: 1

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