请教个结构体的问题

[织田信长]

typedef struct PLNODE
{
unsigned char PlNodeID; //负载节点的ID
unsigned char PlNodeListenPort; //负载节点的监听端口
unsigned char PlNodeSendPort; //负载节点的发送端口
unsigned char PlNodeStatus; //节点状态字
int PlNodeUserNum; //节点当前使用的人数
int MaxUserInPlNode; //该节点的最大用户数
int UserID[MAX_USER]; //用户列表
};


typedef struct PLNODE_LIST
{
PLNODE* PtrPlNode[MAX_NODE_EX]; //指向负载节点数据结构的指针
int MaxSuportNodeNum; //最大支持的节点数
int AliveNodeNum; //正在使用的节点数
};


c:\code\hoho2\sysctrlnode\structex.h(106) : error C2061: syntax error : identifier 'PLNODE'
c:\code\hoho2\sysctrlnode\structex.h(109) : error C2059: syntax error : '}'
c:\code\hoho2\sysctrlnode\structex.h(120) : error C2061: syntax error : identifier 'PLNODE_LIST'
c:\code\hoho2\sysctrlnode\structex.h(122) : error C2059: syntax error : '}'
c:\code\hoho2\sysctrlnode\recovery.h(45) : error C2143: syntax error : missing ')' before '*'
c:\code\hoho2\sysctrlnode\recovery.h(45) : error C2081: 'SYS_CTRL_NODE_MANAGER' : name in formal parameter list illegal
c:\code\hoho2\sysctrlnode\recovery.h(45) : error C2143: syntax error : missing '{' before '*'
c:\code\hoho2\sysctrlnode\recovery.h(45) : error C2059: syntax error : 'type'
c:\code\hoho2\sysctrlnode\recovery.h(45) : error C2059: syntax error : ')'
c:\code\hoho2\sysctrlnode\recovery.c(11) : error C2143: syntax error : missing ')' before '*'
c:\code\hoho2\sysctrlnode\recovery.c(11) : error C2081: 'SYS_CTRL_NODE_MANAGER' : name in formal parameter list illegal
c:\code\hoho2\sysctrlnode\recovery.c(11) : error C2143: syntax error : missing '{' before '*'
c:\code\hoho2\sysctrlnode\recovery.c(11) : error C2059: syntax error : 'type'
c:\code\hoho2\sysctrlnode\recovery.c(11) : error C2059: syntax error : ')'

很困惑是结构体这样定义有问题吗？

[W170532934]

定义的第一个结构体没有起别名，为什么要使用typedef？？把这个typedef去掉吧！

[W170532934]

第二个结构体的typedef也是要去掉的

[织田信长]

typedef struct PLNODE
{
unsigned char PlNodeID; //负载节点的ID
unsigned char PlNodeListenPort; //负载节点的监听端口
unsigned char PlNodeSendPort; //负载节点的发送端口
unsigned char PlNodeStatus; //节点状态字
int PlNodeUserNum; //节点当前使用的人数
int MaxUserInPlNode; //该节点的最大用户数
int UserID[MAX_USER]; //用户列表
}PLNODE;

这么写就好了…… 不知道原因……

[浮生专栏]

既然写了typedef，在结构体最后怎么没写别名，C语言对着可能有要求，我的VS坏了，不能测试，楼主自己测一下吧。

[赵4老师]

Typedef Declarations
A typedef declaration is a declaration with typedef as the storage class. The declarator becomes a new type. You can use typedef declarations to construct shorter or more meaningful names for types already defined by C or for types that you have declared. Typedef names allow you to encapsulate implementation details that may change.

A typedef declaration is interpreted in the same way as a variable or function declaration, but the identifier, instead of assuming the type specified by the declaration, becomes a synonym for the type.

Syntax

declaration :

declaration-specifiers init-declarator-list opt ;

declaration-specifiers :

storage-class-specifier declaration-specifiers opt
type-specifier declaration-specifiers opt
type-qualifier declaration-specifiers opt

storage-class-specifier :

typedef

type-specifier :

void
char
short
int
long
float
double
signed
unsigned
struct-or-union-specifier
enum-specifier
typedef-name

typedef-name :

identifier

Note that a typedef declaration does not create types. It creates synonyms for existing types, or names for types that could be specified in other ways. When a typedef name is used as a type specifier, it can be combined with certain type specifiers, but not others. Acceptable modifiers include const and volatile.

Typedef names share the name space with ordinary identifiers (see Name Spaces in Chapter 2 for more information). Therefore, a program can have a typedef name and a local-scope identifier by the same name. For example:

typedef char FlagType;

int main()
{
}

int myproc( int )
{
int FlagType;
}

When declaring a local-scope identifier by the same name as a typedef, or when declaring a member of a structure or union in the same scope or in an inner scope, the type specifier must be specified. This example illustrates this constraint:

typedef char FlagType;
const FlagType x;

To reuse the FlagType name for an identifier, a structure member, or a union member, the type must be provided:

const int FlagType; /* Type specifier required */

It is not sufficient to say

const FlagType; /* Incomplete specification */

because the FlagType is taken to be part of the type, not an identifier that is being redeclared. This declaration is taken to be an illegal declaration like

int; /* Illegal declaration */

You can declare any type with typedef, including pointer, function, and array types. You can declare a typedef name for a pointer to a structure or union type before you define the structure or union type, as long as the definition has the same visibility as the declaration.

Typedef names can be used to improve code readability. All three of the following declarations of signal specify exactly the same type, the first without making use of any typedef names.

typedef void fv( int ), (*pfv)( int ); /* typedef declarations */

void ( *signal( int, void (*) (int)) ) ( int );
fv *signal( int, fv * ); /* Uses typedef type */
pfv signal( int, pfv ); /* Uses typedef type */

Examples

The following examples illustrate typedef declarations:

typedef int WHOLE; /* Declares WHOLE to be a synonym for int */

Note that WHOLE could now be used in a variable declaration such as WHOLE i; or const WHOLE i;. However, the declaration long WHOLE i; would be illegal.

typedef struct club
{
char name[30];
int size, year;
} GROUP;

This statement declares GROUP as a structure type with three members. Since a structure tag, club, is also specified, either the typedef name (GROUP) or the structure tag can be used in declarations. You must use the struct keyword with the tag, and you cannot use the struct keyword with the typedef name.

typedef GROUP *PG; /* Uses the previous typedef name
to declare a pointer */

The type PG is declared as a pointer to the GROUP type, which in turn is defined as a structure type.

typedef void DRAWF( int, int );

This example provides the type DRAWF for a function returning no value and taking two int arguments. This means, for example, that the declaration

DRAWF box;

is equivalent to the declaration

void box( int, int );

[jiandingzhe]

应当是：

typedef struct { } TypeName;

[ProgrammingRing]

typedef定义新的类型，你第二个用了typedef但没给新的名字啊，第一个要用的话得价格struct PLNODE * XXXX;

[PIE]

[Quote=引用楼主 的回复:]
typedef struct PLNODE
{
unsigned char PlNodeID; //负载节点的ID
unsigned char PlNodeListenPort; //负载节点的监听端口
unsigned char PlNodeSendPort; //负载节点的发送端口
unsigned char PlNodeStatus; //节点状态字
int Pl……
[/Quote]顶一个

[litao_yuanyuan]

typedef说简单就是取别名的意思，你那个没有别名，所以不对

[Caworb]

typedef的问题！在结构体完结的分号前要加上该结构体的别名！
在C中使用结构体需要写成：struct Sname
所以为了省略个struct而用typedef…(其实还有其它原因)
而CPP中就已经可以不用struct而直接用结构体名了！所以也可以不加typedef了…
楼主查下typedef的用法就好了…

[MFCANDPAI]

这其实是格式的问题，楼主试试各种格式就行了

[OSTnm]

无问题 这个表示PLNODE代表这个结构体定义类型

[织田信长]

谢谢大家了，没想到这么多人回复

[珠琪]

究竟谁说的对呀