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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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