add dynamic port

v2/example_server/main.go

@@ -9,7 +9,9 @@ import (
 )
 
 func main() {
-	v2.StartGrpcServer()
+
+	// defer C.free(unsafe.Pointer(port))
+	v2.StartGrpcServerGo("127.0.0.1:50051")
 	sigChan := make(chan os.Signal, 1)
 	signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM)
 	<-sigChan

v2/grpc_server.go

@@ -1,5 +1,9 @@
 package v2
 
+/*
+#include "stdint.h"
+*/
+
 import "C"
 import (
 	"log"
@@ -9,26 +13,37 @@ import (
 	"google.golang.org/grpc"
 )
 
-const (
-	port = ":50051"
-)
-
 type server struct {
 	pb.UnimplementedHiddifyServer
 }
 
 //export StartGrpcServer
-func StartGrpcServer() {
-	lis, err := net.Listen("tcp", port)
+func StartGrpcServer(listenAddress *C.char) (CErr *C.char) {
+	//Example Listen Address: "127.0.0.1:50051"
+	err := StartGrpcServerGo(C.GoString(listenAddress))
+	if err != nil {
+		return C.CString(err.Error())
+	}
+	return nil
+}
+
+func StartGrpcServerGo(listenAddressG string) error {
+	//Example Listen Address: "127.0.0.1:50051"
+	// defer C.free(unsafe.Pointer(CErr))          // free the C string when it's no longer needed
+	// defer C.free(unsafe.Pointer(listenAddress)) // free the C string when it's no longer needed
+
+	lis, err := net.Listen("tcp", listenAddressG)
 	if err != nil {
 		log.Printf("failed to listen: %v", err)
+		return err
 	}
 	s := grpc.NewServer()
 	pb.RegisterHiddifyServer(s, &server{})
-	log.Printf("Server listening on %s", port)
+	log.Printf("Server listening on %s", listenAddressG)
 	go func() {
 		if err := s.Serve(lis); err != nil {
 			log.Printf("failed to serve: %v", err)
 		}
 	}()
+	return nil
 }