Question

Im writing a project in C with visual studio that contains these files:

1. multiThreadServer.cpp
2. myLib.cpp
3. myLib.h

The 1st (multiThreadServer.cpp) includes these

#include <WinSock2.h>
#include <Windows.h>
#include <stdio.h>
#include "myLib.h"

2nd (myLib.cpp) these

#include <WinSock2.h>
#include <stdio.h>
#include "myLib.h"

3nd (myLib.h) includes nothing

In .h file i have these functions defined:

// Starts up the server.
INT start_server(const unsigned short port);
// Accept Connections.
BOOL accept_connections();
// Accept Client.
BOOL AcceptClient(PCLIENT current_client);
// Receiver Function for the thread.
DWORD WINAPI Receiver(LPVOID lpParam);
// Receive data from client.
BOOL recv_data(PCLIENT current_client, char *buffer, int size);
// End server.
VOID end_server();
// Send data.
BOOL send_data(PCLIENT current_client, char *buffer, int size);
// Disconnect Client.
VOID disconnect_client(PCLIENT current_client);
// Send Data to all clients.
BOOL send_data_to_all(char *message);

Here is part of myLib.cpp:

typedef struct _client{
    SOCKADDR_IN     address;        // internal data structure regarding this client
    SOCKET          socket;         // this clients socket
    BOOL            connected;      // is this client connected
    char            IP[20];         // this clients IP address
    int             address_length; // internal data structure regarding this client
} CLIENT, *PCLIENT;

Now, when im going to compile the whole project these annoying syntax errors returned:

1>  myLib.cpp
\mylib.h(8): error C2146: syntax error : missing ')' before identifier 'current_client'
\mylib.h(8): error C2061: syntax error : identifier 'current_client'
\mylib.h(8): error C2059: syntax error : ';'
\mylib.h(8): error C2059: syntax error : ')'
\mylib.h(14): error C2146: syntax error : missing ')' before identifier 'current_client'
\mylib.h(14): error C2061: syntax error : identifier 'current_client'
\mylib.h(14): error C2059: syntax error : ';'
\mylib.h(14): error C2059: syntax error : ','
\mylib.h(14): error C2059: syntax error : ')'
\mylib.h(20): error C2146: syntax error : missing ')' before identifier 'current_client'
\mylib.h(20): error C2061: syntax error : identifier 'current_client'
\mylib.h(20): error C2059: syntax error : ';'
\mylib.h(20): error C2059: syntax error : ','
\mylib.h(20): error C2059: syntax error : ')'
\mylib.h(23): error C2146: syntax error : missing ')' before identifier 'current_client'
\mylib.h(23): error C2061: syntax error : identifier 'current_client'
\mylib.h(23): error C2059: syntax error : ';'
\mylib.h(23): error C2059: syntax error : ')'
\mylib.cpp(103): warning C4013: 'AcceptClient' undefined; assuming extern returning int
\mylib.cpp(168): warning C4013: 'recv_data' undefined; assuming extern returning int
\mylib.cpp(188): warning C4013: 'send_data' undefined; assuming extern returning int
\mylib.cpp(189): warning C4013: 'disconnect_client' undefined; assuming extern returning int
\mylib.cpp(270): error C2371: 'disconnect_client' : redefinition; different basic types
1>  multiThreadServer.cpp
\mylib.h(8): error C2146: syntax error : missing ')' before identifier 'current_client'
1\mylib.h(8): error C2061: syntax error : identifier 'current_client'
\mylib.h(8): error C2059: syntax error : ';'
\mylib.h(8): error C2059: syntax error : ')'
\mylib.h(14): error C2146: syntax error : missing ')' before identifier 'current_client'
\mylib.h(14): error C2061: syntax error : identifier 'current_client'
\mylib.h(14): error C2059: syntax error : ';'
\mylib.h(14): error C2059: syntax error : ','
\mylib.h(14): error C2059: syntax error : ')'
\mylib.h(20): error C2146: syntax error : missing ')' before identifier 'current_client'
\mylib.h(20): error C2061: syntax error : identifier 'current_client'
\mylib.h(20): error C2059: syntax error : ';'
\mylib.h(20): error C2059: syntax error : ','
\mylib.h(20): error C2059: syntax error : ')'
\mylib.h(23): error C2146: syntax error : missing ')' before identifier 'current_client'
\mylib.h(23): error C2061: syntax error : identifier 'current_client'
\mylib.h(23): error C2059: syntax error : ';'
\mylib.h(23): error C2059: syntax error : ')'

I m searching 1.30 hour now on net but i cannot find a way to fix it.

What the problem could be ?

Answer 1

Alternatively to what’s suggested here, you fix the problem in the header file without actually moving the definition of PCLIENT into the header:

...
struct _client;
...
// Accept Client.
BOOL AcceptClient(struct _client* current_client);
...
// Receive data from client.
BOOL recv_data(struct _client* current_client, char *buffer, int size);
...
// Send data.
BOOL send_data(struct _client* current_client, char *buffer, int size);
// Disconnect Client.
VOID disconnect_client(struct _client* current_client);
...