cxcodeswiftinput-parameters

How to pass a Swift string to a c function?

I am having serious trouble passing a string from swift, to a function written in c.

I'm trying to do this in my swift code

var address = "192.168.1.2"
var port = 8888

initSocket(address, port)

The c function looks like this:

void initSocket(char *address, int port);

Im getting the error: Cannot convert the expression's of type 'Void' to type 'CMutablePointer'

I can't seem to find a solution that works.

Solution

  • Swift CStrings work seamlessly with C constant strings, so use

    void initSocket(const char *address, int port);

    instead of char* argument, and declare your address variable as CString:

    var address: CString = "192.168.1.2";