The compiler is Visual C++.
I'm trying to fix this C code to work in Windows since my app is a Windows service written in Visual C++. It would be be real nice if openSSL had a version
of the sample program that works in Microsoft Visual C++.
Anyway, I went to my existing C++ code and found where it creates a socket and the type needs to be SOCKET, not int.
On Wed, May 24, 2023 at 12:02 PM Michael Wojcik via openssl-users <openssl-users@xxxxxxxxxxx> wrote:
> From: Don Payette <payettedon@xxxxxxxxx>
> Sent: Wednesday, 24 May, 2023 10:42
> Right now I'm attempting to compile sslecho using Microsoft Visual C++.
> It's giving me an error which I can't figure out.
> I'm guessing that this is because it's C++ instead of C.
I'm not sure what you believe is C++. The code you posted here is C.
> int create_socket ()
> {
> int s;
> int optval = 1;
>
> s = socket (AF_INET, SOCK_STREAM, 0);
> if (s < 0) {
> perror("Unable to create socket");
> exit(EXIT_FAILURE);
> }
>
> return s;
> }
This isn't going to work on Windows, where the return type of the socket() function is HANDLE, not int. This code is written to work in a UNIX (SUS, POSIX) environment. As it is, it's not suitable for Windows, unless you're building under a POSIX or POSIX-like environment within Windows such as WSL, MinGW, or Cygwin.
...
> client_skt = create_socket;
>
> Error (active) E0513 a value of type "int (*)()" cannot be assigned to an entity of type "int" OpenSSL-Demo line 152
create_socket is a function. This line is not invoking the function; it's trying to assign it to a variable. You can only do that in C if the variable is of a function-pointer type.
What you want here is:
client_skt = create_socket();
Note the parentheses.
However, as I pointed out above, this code is unsuitable for Windows anyway, unless you're working in a POSIXy environment.
--
Michael Wojcik
