“[类别]不名执行文件类型错误

Question

我主要的代码看起来像这样：

#include "ClientSocket.h" 
#include "SocketException.h" 
#include <iostream> 
#include <string> 

int main (int argc, char argv[]) 
{ 
    std::cout << "" << std::endl; 
    try 
    { 
     ClientSocket client_socket ("localhost", 30000); 
     std::string reply; 

     try 
     { 
      client_socket << "Test message."; 
      client_socket >> reply; 
     } 
     catch (SocketException&) {} 

     std::cout << "We received this response from the server:\n\"" << reply << "\"\n";; 
    } 
    catch (SocketException& e) 
    { 
     std::cout << "Exception was caught:" << e.description() << "\n"; 
    } 

    return 0; 
} 

头文件看起来像这样：

// Definition of the ClientSocket class 

#include "ClientSocket.cpp" 
#include "Socket.h" 
#ifndef _CLIENTSOCKET_H 
#define _CLIENTSOCKET_H 

class ClientSocket : private Socket 
{ 
    public: 
     ClientSocket (std::string host, int port); 
     virtual ~ClientSocket(){}; 
     const ClientSocket& operator << (const std::string&) const; 
     const ClientSocket& operator >> (std::string&) const; 
}; 

#endif 

和实施文件看起来像这样：

// Implementation of the ClientSocket class 

#include "Socket.h" 
#include "SocketException.h" 

ClientSocket::ClientSocket (std::string host, int port) 
{ 
    if (! Socket::create()) 
    { 
     throw SocketException ("Could not create client socket."); 
    } 

    if (! Socket::connect (host, port)) 
    { 
     throw SocketException ("Could not bind to port."); 
    } 
} 

const ClientSocket& ClientSocket::operator << (const std::string& s) const 
{ 
    if (! Socket::send (s)) 
    { 
     throw SocketException ("Could not write to socket."); 
    } 

    return *this; 
} 

const ClientSocket& ClientSocket::operator >> (std::string& s) const 
{ 
    if (! Socket::recv (s)) 
    { 
     throw SocketException ("Could not read from socket."); 
    } 

    return *this; 
} 

我发现，编译这些文件会导致编译错误的木筏在implemen特别是，无论我使用的包含和警卫的组合如何。

In file included from ClientSocket.h:3:0, 
       from simple_client_main.cpp:1: 
ClientSocket.cpp:6:1: error: 'ClientSocket' does not name a type 
ClientSocket::ClientSocket (std::string host, int port) 
^ 
ClientSocket.cpp:19:7: error: 'ClientSocket' does not name a type 
const ClientSocket& ClientSocket::operator << (const std::string& s) const 
    ^
ClientSocket.cpp:29:7: error: 'ClientSocket' does not name a type 
const ClientSocket& ClientSocket::operator >> (std::string& s) const 
    ^

张贴的东西似乎是最有意义的。我试过在实现文件中包含头文件，它什么都不做。我试过从头文件中删除包含，并在实现文件中包含头文件，但是这会用未定义的引用错误替换'不命名类型'错误。代码中是否存在阻止编译的内容？

Answer 1

你不应该试图包括我认为ClientSocket.h的ClientSocket.cpp。请注意，'include'仅仅是一个测试替换，在这种情况下，在定义类本身之前，您正在有效地替换ClientSocket.cpp的内容（包括未声明的ClientSocket类的方法定义）。

此外，ClientSocket.cpp不包括ClientSocket.h，因此或者不访问ClientSocket类定义在所有，或经由其它标题有它，后者的情况下被高度气馁。

Answer 2

头文件看起来像这样：

// Definition of the ClientSocket class 

#include "ClientSocket.cpp" <== this definitely looks wrong. 

通常不包括cpp文件。这是其他方式，你ClientSocket.cpp应该包括你的ClientSocket.h：

// Implementation of the ClientSocket class 
#include "ClientSocket.h" 
#include "SocketException.h" 

ClientSocket::ClientSocket(std::string host, int port) 
{ 
    ... 

页眉后卫_CLIENTSOCKET_H在ClientSocket.h应该来你有Socket.h之前，也不要使用与一个或两个下划线开头的名称（它们是保留的标识符）：

#ifndef CLIENTSOCKET_H 
#define CLIENTSOCKET_H 

#include "Socket.h" 

class ClientSocket : private Socket 
{ 
    ... 
}; 

#endif /* CLIENTSOCKET_H */ 

你ClientSocket.h引用std::string，也许这是包括来自Socket.h。如果没有，你应该包括它ClientSocket.h