Question

这个C ++的东西很新，并且一直在尝试整夜用子文件夹中的头文件编译一个基本程序 - 我必须是一个非常愚蠢但很容易修复的东西。也许我对名称空间缺乏了解 - 或者如何包含标题???

希望有人可以帮助我

所有示例似乎都说我可以在一行或单独的步骤中编译/链接 - 单独的步骤似乎给我的错误数量最少

我可以获取cpp文件来编译和创建.o文件，但无法创建输出文件。

最后一次尝试： g++ ProcessCAP.o ./network/SocketClient.o -o ProcessCAP

错误讯息：
./network/SocketClient.o:(.rodata+0xc0): undefined reference to 'CAP::SocketClient::send(std::string)' collect2: error: ld returned 1 exit status

主程序：

#include <iostream>
#include <signal.h>
#include "network/SocketClient.h"

using namespace std;
using namespace CAP;

//int argc, char *argv[]

int main(void){

    cout << "Starting CAP Processor Example" << "\n";
    SocketClient sc("streaming1.my-url.com", 8080);
    sc.connectToServer();

    string rec = sc.receive(4096);
    while (rec.length() > 0) {
        cout << "Received [" << rec << "] \n";
        string rec = sc.receive(4096);
    }

    sc.disconnectFromServer();
    cout << "End of CAP Processor Example" << "\n";
}

＆＃34;网络中的文件＆＃34;子文件夹：

SocketClient.cpp

#include "SocketClient.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>

using namespace std;

namespace CAP {

SocketClient::SocketClient(std::string serverName, int portNumber) {
    this->socketfd = -1;
    this->server = NULL;
    this->serverName = serverName;
    this->portNumber = portNumber;
    this->isConnected = false;
}

int SocketClient::connectToServer(){

    socketfd = socket(AF_INET, SOCK_STREAM, 0);
    if (socketfd < 0){
        perror("Socket Client: error opening socket.\n");
        return 1;
    }
    server = gethostbyname(serverName.data());
    if (server == NULL) {
        perror("Socket Client: error - no such host.\n");
        return 1;
    }
    bzero((char *) &serverAddress, sizeof(serverAddress));
    serverAddress.sin_family = AF_INET;
    bcopy((char *)server->h_addr,(char *)&serverAddress.sin_addr.s_addr, server->h_length);
    serverAddress.sin_port = htons(portNumber);

    if (connect(socketfd, (struct sockaddr *) &serverAddress, sizeof(serverAddress)) < 0){
        perror("Socket Client: error connecting to the server.\n");
        return 1;
    }
    this->isConnected = true;
    return 0;
}

string SocketClient::receive(int size=4096){
    char readBuffer[size];
    int n = read(this->socketfd, readBuffer, sizeof(readBuffer));
    if (n < 0){
       perror("Socket Client: error reading from socket");
    }
    return string(readBuffer);
}

int SocketClient::disconnectFromServer(){
    this->isConnected = false;
    close(this->socketfd);
    return 0;
}

SocketClient::~SocketClient() {
    if (this->isConnected == true){
        disconnectFromServer();
    }
}

} /* namespace CAP */

SocketClient.h （也在网络子文件夹中）

#ifndef SOCKETCLIENT_H_
#define SOCKETCLIENT_H_

#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netdb.h>
#include <string>

namespace CAP {

class SocketClient {

private:
    int         socketfd;
    struct      sockaddr_in   serverAddress;
    struct      hostent       *server;
    std::string serverName;
    int         portNumber;
    bool        isConnected;

public:
    SocketClient(std::string serverName, int portNumber);
    virtual int connectToServer();
    virtual int disconnectFromServer();
    virtual int send(std::string message);
    virtual std::string receive(int size);
    bool isClientConnected() { return this->isConnected; }
    virtual ~SocketClient();
};

}

#endif /* SOCKETCLIENT_H_ */

使用g ++编译和链接程序与子文件夹中的标题cpp文件

0 个答案: