``` SOCK_STREAM ```#define INVALID_SOCKET (SOCKET)(~0) #define SOCKET_ERROR (-1)
时间: 2024-05-25 13:08:36 浏览: 118
`SOCK_STREAM`是一种基于TCP协议的面向连接的流式套接字类型,它提供了可靠的、双向的、面向连接的数据传输服务,常用于应用程序之间的数据交换和通信。与`SOCK_STREAM`相对应的还有`SOCK_DGRAM`类型,它是一种基于UDP协议的无连接的数据传输服务,常用于实时通信和广播等场景。
另外,`INVALID_SOCKET`是一个无效的socket句柄值,用于标识一个无效的socket对象;`SOCKET_ERROR`则表示一个函数返回失败的状态值,通常在调用socket相关函数时用于判断操作是否成功。
相关问题
修改以下代码将视屏发送给服务端并将视频保存到本地#define _CRT_SECURE_NO_WARNINGS #include<iostream> #include <sstream> #include<string> #include <fstream> #include <vector> #include<winsock.h> #pragma
注:为了确保代码的正确性和安全性,以下是修改后的代码:
```cpp
#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <sstream>
#include <string>
#include <fstream>
#include <vector>
#include <winsock.h>
#pragma comment(lib,"ws2_32.lib")
void SaveVideo(const std::string& filePath, const std::vector<char>& videoData) {
std::ofstream file(filePath, std::ios::out | std::ios::binary);
if (file.is_open()) {
file.write(videoData.data(), videoData.size());
file.close();
std::cout << "Video saved successfully." << std::endl;
}
else {
std::cerr << "Failed to save video." << std::endl;
}
}
int main() {
WSADATA wsaData;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
std::cerr << "Failed to initialize winsock." << std::endl;
return 1;
}
SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, 0);
if (clientSocket == INVALID_SOCKET) {
std::cerr << "Failed to create socket." << std::endl;
WSACleanup();
return 1;
}
sockaddr_in serverAddress{};
serverAddress.sin_family = AF_INET;
serverAddress.sin_port = htons(12345); // 修改为服务端的端口号
serverAddress.sin_addr.s_addr = inet_addr("127.0.0.1"); // 修改为服务端的IP地址
if (connect(clientSocket, reinterpret_cast<sockaddr*>(&serverAddress), sizeof(serverAddress)) != 0) {
std::cerr << "Failed to connect to the server." << std::endl;
closesocket(clientSocket);
WSACleanup();
return 1;
}
std::string filePath = "video.mp4"; // 修改为要保存的视频文件路径
std::ifstream file(filePath, std::ios::in | std::ios::binary);
if (file.is_open()) {
std::vector<char> videoData((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
file.close();
// 发送视频数据到服务端
if (send(clientSocket, videoData.data(), videoData.size(), 0) == SOCKET_ERROR) {
std::cerr << "Failed to send video data." << std::endl;
}
else {
std::cout << "Video data sent successfully." << std::endl;
}
// 保存视频到本地
SaveVideo("received_video.mp4", videoData);
}
else {
std::cerr << "Failed to open video file." << std::endl;
}
closesocket(clientSocket);
WSACleanup();
return 0;
}
```
请确保以下几点:
1. 修改 `serverAddress.sin_port` 为服务端的端口号。
2. 修改 `serverAddress.sin_addr.s_addr` 为服务端的IP地址。
3. 修改 `filePath` 为要保存的视频文件路径。
4. 确保链接了 `ws2_32.lib` 库。
注意:这是一个简单的示例代码,仅展示了如何将视频数据发送到服务端并将其保存到本地。实际情况可能需要进行更多的错误处理和安全性考虑。
windows环境下#include <stdio.h> #include <stdlib.h> #include <string.h> #include<windows.h> #include <WinSock2.h> #define PORT 8888 int main(int argc, char const *argv[]) { int sock = 0, valread; struct sockaddr_in serv_addr; char buffer[1024] = {0}; char filename[100] = {0}; FILE *fp; // 创建 socket 文件描述符 if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) { printf("\n Socket creation error \n"); return -1; } // 初始化地址结构体 memset(&serv_addr, '0', sizeof(serv_addr)); serv_addr.sin_family = AF_INET; serv_addr.sin_port = htons(PORT); // 将 IP 地址从字符串转换为二进制格式 if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) { printf("\n Invalid address/ Address not supported \n"); return -1; } // 连接服务器 if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) { printf("\n Connection Failed \n"); return -1; } // 发送文件名 printf("Enter filename: "); scanf("%s", filename); send(sock, filename, strlen(filename), 0); // 打开文件 fp = fopen(filename, "rb"); if (fp == NULL) { perror("fopen failed"); exit(EXIT_FAILURE); } // 发送文件内容 while (!feof(fp)) { valread = fread(buffer, sizeof(char), sizeof(buffer), fp); send(sock, buffer, valread, 0); memset(buffer, 0, sizeof(buffer)); } // 关闭文件和 socket fclose(fp); close(sock); return 0;}该怎么写
这是一个基于 Socket 实现文件传输的客户端程序,需要连接到一个运行在本地的服务器。以下是完整代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <winsock2.h>
#define PORT 8888
int main(int argc, char const *argv[])
{
WSADATA wsa;
SOCKET sock = INVALID_SOCKET;
struct sockaddr_in serv_addr;
char buffer[1024] = {0};
char filename[100] = {0};
FILE *fp;
int valread;
// 初始化 Winsock 库
if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
{
printf("WSAStartup failed. Error Code : %d\n", WSAGetLastError());
return -1;
}
// 创建 socket 文件描述符
if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET)
{
printf("Socket creation error. Error Code : %d\n", WSAGetLastError());
return -1;
}
// 初始化地址结构体
memset(&serv_addr, '0', sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(PORT);
// 将 IP 地址从字符串转换为二进制格式
if (inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0)
{
printf("Invalid address/ Address not supported.\n");
return -1;
}
// 连接服务器
if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0)
{
printf("Connection failed.\n");
return -1;
}
// 发送文件名
printf("Enter filename: ");
scanf("%s", filename);
send(sock, filename, strlen(filename), 0);
// 打开文件
fp = fopen(filename, "rb");
if (fp == NULL)
{
perror("fopen failed");
exit(EXIT_FAILURE);
}
// 发送文件内容
while (!feof(fp))
{
valread = fread(buffer, sizeof(char), sizeof(buffer), fp);
send(sock, buffer, valread, 0);
memset(buffer, 0, sizeof(buffer));
}
// 关闭文件和 socket
fclose(fp);
closesocket(sock);
// 清理 Winsock 库
WSACleanup();
return 0;
}
```
需要注意的是,在 Windows 环境下使用 Socket 编程需要先调用 `WSAStartup()` 函数来初始化 Winsock 库,并在程序结束时调用 `WSACleanup()` 函数来清理 Winsock 库。此外,Windows 下使用的是 `closesocket()` 函数来关闭 socket,而不是 `close()` 函数。