标签：一个 fst get tput 资源下载 hub read 根据 工程
1.首先从Github-Protobuf下载代码，本文下载的版本号是3.1.0.
2.仔细查看各个README，有相关的资源下载和编译说明.
3.在一个方便的地方创建一个Install类型的文件夹，放置Cmake生成的工程文件相关内容，使用CMake-gui配置，生成visual studio ide工程.
CMAKE_CONFIGRATION_TYPES是工程配置类型，可以删除不感兴趣的配置.
CMAKE_INSTALL_PREFIX是导出visual studio ide项目文件的位置
根据自己的需求选择BUILD_SHARED_LIBS或者是MSVC_STATIC_RUNTIME(对应编译选项/Mtd和/Mt)，二者选其一
4.Open Project直接编译工程.
将生成的protobuf的库引用项目，报如下错误:
1 error LNK2001: 无法解析的外部符号 "class google::protobuf::internal::ExplicitlyConstructed,class std::allocator > > google::protobuf::internal::fixed_address_empty_string" (?fixed_address_empty_string@internal@protobuf@google@@3V?$ExplicitlyConstructed@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@123@A)
2 error LNK2001: 无法解析的外部符号 "class google::protobuf::internal::ExplicitlyConstructed,class std::allocator > > google::protobuf::internal::fixed_address_empty_string" (?fixed_address_empty_string@internal@protobuf@google@@3V?$ExplicitlyConstructed@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@123@A)
3 error LNK2001: 无法解析的外部符号 "int google::protobuf::internal::empty_string_once_init_" (?empty_string_once_init_@internal@protobuf@google@@3HA)
需要在工程中添加预处理PROTOBUF_USE_DLLS
Protos:
1 syntax = "proto3";
2
3 message CoinMsg
4 {
5
6 }
7
8 syntax = "proto3";
9
10 message ExecMsg
11 {
12 string name = 1;
13 }
14
15 syntax = "proto3";
16
17 message VerifyMsg
18 {
19 bool isOk = 1;
20 string error = 2;
21 }
22
23 syntax = "proto3";
24
25 import "ExecMsg.proto";
26 import "CoinMsg.proto";
27 import "VerifyMsg.proto";
28
29 message MsgPolicy
30 {
31 enum Type
32 {
33 ExecMsg = 0;
34 CoinMsg = 1;
35 VerifyMsg = 2;
36 }
37 Type type = 1;
38 ExecMsg execMsg = 2;
39 CoinMsg coinMsg = 3;
40 VerifyMsg verifyMsg = 4;
41 }
View Code
每个Message对应一个proto文件
// 一次生成完cpp与csharp代码，注protobuf-version-3.1.0
protoc -I ./*.proto --cpp_out=../cpp --csharp_out=../csharp
使用示例:
1 #include "ConfigHelper.h"
2 #include 3 #include 4 #include 5 #include 6 #include 7 #include string>
8 #include "MsgPolicy.pb.h"
9 #include 10 #include 11 #include 12
13 ConfigHelper * ConfigHelper::instance = new ConfigHelper();
14
15 ConfigHelper::ConfigHelper()
16 {
17 #pragma region standard c++ io
18 {
19 // 序列化到文件
20 MsgPolicy msgPolicy;
21 ExecMsg *execMsg = new ExecMsg();
22 execMsg->set_name("exec message name.");
23 msgPolicy.set_allocated_execmsg(execMsg);
24 msgPolicy.set_type(MsgPolicy::ExecMsg);
25 //QFile file("msg.bin");
26 //file.open(QIODevice::WriteOnly);
27 std::fstream out("msg.bin", std::ios::out | std::ios::binary | std::ios::trunc);
28 msgPolicy.SerializeToOstream(&out);
29 out.close();
30
31 // 从文件反序列化到对象
32 MsgPolicy dmsgPolicy;
33 std::fstream in("msg.bin", std::ios::in | std::ios::binary);
34 if (!dmsgPolicy.ParseFromIstream(&in))
35 {
36 qDebug() "deserialize data error.";
37 return;
38 }
39 if (dmsgPolicy.type() == MsgPolicy_Type::MsgPolicy_Type_CoinMsg);
40 else if (dmsgPolicy.type() == MsgPolicy_Type::MsgPolicy_Type_ExecMsg)
41 {
42 qDebug() "policy message type = " "MsgPolicy_Type::MsgPolicy_Type_ExecMsg";
43 qDebug() "execMsg name = " QString::fromStdString(dmsgPolicy.execmsg().name());
44 }
45 else if (dmsgPolicy.type() == MsgPolicy_Type::MsgPolicy_Type_VerifyMsg);
46 in.close();
47 }
48 #pragma endregion standard c++ io
49
50 #pragma region protobuf codedstream
51 {
52 // 序列化
53 MsgPolicy msgPolicy5;
54 VerifyMsg *verifyMsg = new VerifyMsg();
55 verifyMsg->set_isok(false);
56 verifyMsg->set_error("the password is invalid.");
57 msgPolicy5.set_allocated_verifymsg(verifyMsg);
58 msgPolicy5.set_type(MsgPolicy_Type::MsgPolicy_Type_VerifyMsg);
59 int len = msgPolicy5.ByteSize() + 4;
60 char *buffer = new char[len];
61 google::protobuf::io::ArrayOutputStream arrayOut(buffer, len);
62 google::protobuf::io::CodedOutputStream codedOut(&arrayOut);
63 codedOut.WriteVarint32(msgPolicy5.ByteSize());
64 if (!msgPolicy5.SerializeToCodedStream(&codedOut))
65 {
66 qDebug() "serialize error.";
67 }
68 delete buffer;
69
70 // 序列化
71 len = msgPolicy5.ByteSize();
72 buffer = new char[len];
73 if (!msgPolicy5.SerializeToArray(buffer, len)) qDebug() "serialize error.";
74
75 // 反序列化
76 MsgPolicy msgPolicy6;
77 msgPolicy6.ParseFromArray(buffer, len);
78 if (msgPolicy6.type() == MsgPolicy_Type::MsgPolicy_Type_CoinMsg);
79 else if (msgPolicy6.type() == MsgPolicy_Type::MsgPolicy_Type_ExecMsg);
80 else if (msgPolicy6.type() == MsgPolicy_Type::MsgPolicy_Type_VerifyMsg)
81 {
82 qDebug() "policy message type = " "MsgPolicy_Type::MsgPolicy_Type_VerifyMsg";
83 qDebug() "isOk = " "error = " QString::fromStdString(msgPolicy6.verifymsg().error());
84 }
85 delete buffer;
86 }
87 #pragma endregion protobuf codedstream
88 google::protobuf::ShutdownProtobufLibrary();
89 }
// 输出结果
policy message type = MsgPolicy_Type::MsgPolicy_Type_ExecMsg
execMsg name = "exec message name."
policy message type = MsgPolicy_Type::MsgPolicy_Type_VerifyMsg
isOk = false error = "the password is invalid."
windows下编译google-protocolbuf在Qt中使用
标签：一个 fst get tput 资源下载 hub read 根据 工程
原文地址：https://www.cnblogs.com/linxmouse/p/8975475.html