# GCMsgProcessor_ProcessNetMsg函数探秘
标签（空格分隔）： C++ 服务器
---
### 简介
GCMsgProcessor_ProcessNetMsg是游戏服务器中网络守护进程，主要用来监听客户端发过来的序列消息（`protobuf`)。传入的参数为`zmq::message_t`类型的`*msg`。
### 执行流程图
```flow
st=>start: GCMsgProcessor_ProcessNetMsg(zmq::message_t *msg)
op0=>operation: return
op01=>operation: return
op02=>operation: return
op03=>operation: return
op04=>operation: return
op05=>operation: return
op06=>operation: return
op1=>operation: ProcessLocalOrder(msg)
op6=>operation: !ExtraNetMsgHeader(msg, &id, &groupID, &unitID, &data, &size)
op2=>operation: Event_ForbidMessage(groupID, unitID)
op3=>operation: player != NULL
op5=>operation: switch(groupID)
op4=>operation: PlayerEntity_AddMsgSt(player, groupID, unitID) > 0
op10=>operation: case NetProto_XXXX::GROUPID:
op100=>operation: switch(unitID)
op101=>operation: case NetProto_ClientException::UNITID:
op102=>operation: break
op11=>operation: break
op07=>operation: return
cond=>condition: true or false?
cond1=>condition: true or false?
cond2=>condition: true or false?
cond3=>condition: true or false?
cond4=>condition: true or false?
cond5=>condition: true or false?
cond6=>condition: true or false?
cond7=>condition: true or false?
e=>end
st->op1->cond
cond(yes)->op0
cond(no)->op6->cond2
cond2(yes)->op01
cond2(no)->op2->cond3
cond3(yes)->op02
cond3(no)->op3->cond4
cond4(yes)->op4->cond5
cond5(yes)->op03
cond4(no)->op5
cond5(no)->op5
op5->op10->cond6
cond6(yes)->op100->op101->cond7
cond6(no)->op10
cond7(yes)->op102->op11->op07->e
cond7(no)->op101
```
### 重要函数以及变量
```c++
//---------重要变量----------
/*
玩家id
*/
int32_t id = -1;
/*
功能序列的组ID和单元ID，
*/
u_int8_t groupID = 0, unitID = 0;
/*
data 为指向消息序列中数据的指针
*/
void *data = NULL;
/*
size 为消息序列的大小
*/
size_t size = 0;
//--------重要函数-------------
/*
PlayerEntity_Player（）函数通过id找到玩家实体，并使player指针指向玩家实体
*/
PlayerEntity *player = PlayerEntity_Player(id);
/*
验证此消息是否是本地消息
*/
ProcessLocalOrder(msg)
/*
解析消息，然后给id、groupID、unitID、data赋值，成功则返回true，失败返回false
*/
ExtraNetMsgHeader(msg, &id, &groupID, &unitID, &data, &size)
/*
验证消息所请求的功能是否是被禁止的，禁止返回true，不禁止返回false
*/
Event_ForbidMessage(groupID, unitID)
/*
验证玩家实体和消息序列的ID
该函数定义在PlayerEntity.cc(137)
*/
PlayerEntity_AddMsgSt(player, groupID, unitID) > 0
```
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