62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
package main
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import (
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"os"
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"github.com/golang/protobuf/proto"
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pb "github.com/protocolbuffers/protobuf/examples/tutorial"
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)
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func writePerson(w io.Writer, p *pb.Person) {
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fmt.Fprintln(w, "Person ID:", p.Id)
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fmt.Fprintln(w, " Name:", p.Name)
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if p.Email != "" {
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fmt.Fprintln(w, " E-mail address:", p.Email)
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}
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for _, pn := range p.Phones {
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switch pn.Type {
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case pb.Person_MOBILE:
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fmt.Fprint(w, " Mobile phone #: ")
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case pb.Person_HOME:
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fmt.Fprint(w, " Home phone #: ")
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case pb.Person_WORK:
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fmt.Fprint(w, " Work phone #: ")
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}
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fmt.Fprintln(w, pn.Number)
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}
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}
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func listPeople(w io.Writer, book *pb.AddressBook) {
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for _, p := range book.People {
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writePerson(w, p)
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}
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}
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// Main reads the entire address book from a file and prints all the
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// information inside.
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func main() {
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if len(os.Args) != 2 {
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log.Fatalf("Usage: %s ADDRESS_BOOK_FILE\n", os.Args[0])
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}
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fname := os.Args[1]
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// [START unmarshal_proto]
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// Read the existing address book.
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in, err := ioutil.ReadFile(fname)
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if err != nil {
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log.Fatalln("Error reading file:", err)
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}
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book := &pb.AddressBook{}
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if err := proto.Unmarshal(in, book); err != nil {
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log.Fatalln("Failed to parse address book:", err)
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}
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// [END unmarshal_proto]
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listPeople(os.Stdout, book)
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}
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