add an example that makes some sample data and writes it out to a file

Signed-off-by: Jeff Carr <jcarr@wit.com>

.gitignore

@@ -0,0 +1 @@
+example-protobuf/example-protobuf

example-protobuf/Makefile

@@ -0,0 +1,2 @@
+run:
+	go run *.go

example-protobuf/main.go

@@ -0,0 +1,99 @@
+package main
+
+import "log"
+import "bytes"
+import "os"
+import "bufio"
+// import "io"
+import "io/ioutil"
+
+import "github.com/golang/protobuf/proto"
+import pb "git.wit.com/wit/witProtobuf"
+
+//
+// writes out several files in /tmp/
+//
+
+func main() {
+	TestWriteEvent()
+
+	in, err := ioutil.ReadFile("/tmp/testing4.protobuf")
+	if err != nil {
+		log.Fatalln("Error reading file:", err)
+	}
+	allEvents := &pb.Event{}
+	if err := proto.Unmarshal(in, allEvents); err != nil {
+		log.Fatalln("Failed to parse events:", err)
+	}
+
+	// listPeople(os.Stdout, allEvents)
+	// got := in.String()
+	log.Println(in)
+}
+
+func marshalWriteToFile(myWriter *bufio.Writer, e *pb.Event) {
+	buf, err := proto.Marshal(e)
+	if err != nil {
+		log.Fatal("marshaling error: ", err)
+	}
+	tmp, err := myWriter.Write(buf)
+	myWriter.Flush()
+	log.Println("bufio.Write() tmp, err = ", tmp, err)
+
+	e.Id += 1
+	e.Name = "jcarrEvent21"
+	buf, err = proto.Marshal(e)
+	tmp2, err := myWriter.Write(buf)
+	myWriter.Flush()
+	log.Println("bufio.Write() tmp2, err = ", tmp2, err)
+}
+
+func TestWriteEvent() {
+	buf := new(bytes.Buffer)
+
+	// [START populate_proto]
+	e := &pb.Event{
+		Id:       1234,
+		Name:     "jcarrEvent1",
+		Email:    "jcarr@wit.com",
+		Results:   []*pb.Event_Response{
+			     {Name: "foobar", Type: pb.Event_ADD},
+		},
+	}
+	// [END populate_proto]
+
+	e.Id += 1
+	e.Name = "jcarrEvent2"
+
+	got := buf.String()
+	log.Println(got)
+
+	newfile, _ := os.Create("/tmp/testing4.protobuf")
+	myWriter := bufio.NewWriter(newfile)
+	marshalWriteToFile(myWriter, e)
+
+	marshalUnmarshal()
+}
+
+func marshalUnmarshal() {
+	test := &pb.Event{
+		Id:       1234,
+		Name:     "jcarrEvent1",
+		Email:    "jcarr@wit.com",
+		Results:   []*pb.Event_Response{
+			     {Name: "555-4321", Type: pb.Event_ADD},
+		},
+	}
+	data, err := proto.Marshal(test)
+	if err != nil {
+		log.Fatal("marshaling error: ", err)
+	}
+
+	newTest := &pb.Event{}
+	err = proto.Unmarshal(data, newTest)
+	if err != nil {
+		log.Fatal("unmarshaling error: ", err)
+	} else {
+		log.Println("proto.Marshal() and proto.Unmarshal() worked")
+	}
+}