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C++实现FTP文件上传的代码及步骤
2023-06-22 09:15:25 深夜i     --     --
C++ FTP 文件上传 代码 步骤

FTP是一种用于文件传输的协议，它允许用户在计算机之间进行文件传输。C++可以轻松地实现FTP文件上传，以下是实现FTP文件上传的代码及步骤。

步骤一：包含头文件

使用C++时，需要包含一些头文件，如下所示：



#include <iostream>


#include <winsock2.h>

步骤二：初始化WinSock

在使用WinSock库之前，需要对它进行初始化。可以使用下面的代码初始化WinSock：



WSADATA wsaData;


if (WSAStartup(MAKEWORD(2, 0), &wsaData) != 0)


std::cout << "WSAStartup failed." << std::endl;


return 1;

步骤三：创建FTP连接

使用下面的代码创建FTP连接：



SOCKET ftpSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);


if (ftpSocket == INVALID_SOCKET) {


std::cout << "socket creation failed." << std::endl;


WSACleanup();


return 1;


}


struct sockaddr_in ftpAddress;


ftpAddress.sin_family = AF_INET;


ftpAddress.sin_port = htons(21);


ftpAddress.sin_addr.s_addr = inet_addr("ftp_server_address");


if (connect(ftpSocket, (SOCKADDR*)&ftpAddress, sizeof(ftpAddress)) == SOCKET_ERROR) {


std::cout << "connection failed." << std::endl;


closesocket(ftpSocket);


WSACleanup();


return 1;


}

步骤四：登录FTP服务器

使用下面的代码登录FTP服务器：



char buffer[1024];


int bytesReceived = recv(ftpSocket, buffer, 1024, 0);


std::cout << buffer;


send(ftpSocket, "USER username\r\n", strlen("USER username\r\n"), 0);


bytesReceived = recv(ftpSocket, buffer, 1024, 0);


std::cout << buffer;


send(ftpSocket, "PASS password\r\n", strlen("PASS password\r\n"), 0);


bytesReceived = recv(ftpSocket, buffer, 1024, 0);


std::cout << buffer;

步骤五：上传文件

使用下面的代码上传文件：



send(ftpSocket, "TYPE I\r\n", strlen("TYPE I\r\n"), 0);


bytesReceived = recv(ftpSocket, buffer, 1024, 0);


std::cout << buffer;


send(ftpSocket, "PASV\r\n", strlen("PASV\r\n"), 0);


bytesReceived = recv(ftpSocket, buffer, 1024, 0);


std::cout << buffer;


int port = parsePort(buffer);


SOCKET dataSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);


if (dataSocket == INVALID_SOCKET) {


std::cout << "data socket creation failed." << std::endl;


closesocket(ftpSocket);


WSACleanup();


return 1;


}


struct sockaddr_in dataAddress;


dataAddress.sin_family = AF_INET;


dataAddress.sin_port = htons(port);


dataAddress.sin_addr.s_addr = inet_addr("ftp_server_address");


if (connect(dataSocket, (SOCKADDR*)&dataAddress, sizeof(dataAddress)) == SOCKET_ERROR) {


std::cout << "data connection failed." << std::endl;


closesocket(dataSocket);


closesocket(ftpSocket);


WSACleanup();


return 1;


}


send(ftpSocket, "STOR filename\r\n", strlen("STOR filename\r\n"), 0);


bytesReceived = recv(ftpSocket, buffer, 1024, 0);


std::cout << buffer;


FILE* file = fopen("filename", "rb");


if (file == NULL) {


std::cout << "file not found." << std::endl;


closesocket(dataSocket);


closesocket(ftpSocket);


WSACleanup();


return 1;


}


char fileBuffer[1024];


int bytesRead = 0;


while ((bytesRead = fread(fileBuffer, 1, 1024, file)) != 0) {


send(dataSocket, fileBuffer, bytesRead, 0);


}


fclose(file);


closesocket(dataSocket);


bytesReceived = recv(ftpSocket, buffer, 1024, 0);


std::cout << buffer;

步骤六：关闭FTP连接

需要使用下面的代码关闭FTP连接：



send(ftpSocket, "QUIT\r\n", strlen("QUIT\r\n"), 0);


bytesReceived = recv(ftpSocket, buffer, 1024, 0);


std::cout << buffer;


closesocket(ftpSocket);


WSACleanup();

综上所述，这是在C++中实现FTP文件上传的代码及步骤。使用这个代码可以轻松地实现FTP文件上传并方便地实现文件传输。

  
  

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