Odin/code/demo.odin

#import win32 "sys/windows.odin";
#import "fmt.odin";
#import "sync.odin";
#import "hash.odin";
#import "math.odin";
#import "mem.odin";
#import "opengl.odin";
#import "os.odin";
#import "utf8.odin";

Dll :: struct {
	Handle :: type rawptr;
	name:   string;
	handle: Handle;
}

load_library :: proc(name: string) -> (Dll, bool) {
	buf: [4096]byte;
	copy(buf[:], name as []byte);

	lib := win32.LoadLibraryA(^buf[0]);
	if lib == nil {
		return nil, false;
	}
	return Dll{name, lib as Dll.Handle}, true;
}

free_library :: proc(dll: Dll) {
	win32.FreeLibrary(dll.handle as win32.HMODULE);
}

get_proc_address :: proc(dll: Dll, name: string) -> (rawptr, bool) {
	buf: [4096]byte;
	copy(buf[:], name as []byte);

	addr := win32.GetProcAddress(dll.handle as win32.HMODULE, ^buf[0]) as rawptr;
	if addr == nil {
		return nil, false;
	}
	return addr, true;
}


main :: proc() {
	lib, lib_ok := load_library("example.dll");
	if !lib_ok {
		fmt.println("Could not load library");
		return;
	}
	defer free_library(lib);

	proc_addr, addr_ok := get_proc_address(lib, "some_thing");
	if !addr_ok {
		fmt.println("Could not load 'some_thing'");
		return;
	}

	some_thing := (proc_addr as proc());
	some_thing();
}