文章目录
一、远程连接
1、通过putty连接
bash
sudo apt update
sudo apt install openssh-server2、查看putty运行状态
bash
sudo systemctl status ssh
3、通过Puuty远程登录Ubuntu
4、添加新用户
查看是否添加成功
bash
cat /etc/passwd | grep -E 'classmate1|classmate2'
5、用新用户登录远程Ubuntu
- X 窗口协议与 VNC-viewer 协议的差异
X 窗口协议：
用于在本地显示远程图形界面，依赖于 X11 转发。
适合运行单个图形程序，性能较高。
VNC 协议：
提供完整的远程桌面访问，支持多用户同时连接。
适合需要完整桌面环境的场景，但性能可能较低。
6、使用VNC远程登录树莓派
二、虚拟机上talk聊天
bash
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <signal.h>
#include <pwd.h>
#define SOCKET_PATH "/tmp/talk_socket_"
#define MAX_CLIENTS 5
struct message {
char sender[32];
char text[256];
};
int server_fd;
char current_user[32] = {0};
void cleanup() {
char path[128];
snprintf(path, sizeof(path), "%s%s", SOCKET_PATH, current_user);
unlink(path); // 删除套接字文件
close(server_fd);
}
void handle_signal(int sig) {
printf("\nCleaning up before exit...\n");
cleanup();
exit(0);
}
void run_server(const char *username) {
struct sockaddr_un addr;
int client_fd;
struct message msg;
// 设置套接字路径
char path[128];
snprintf(path, sizeof(path), "%s%s", SOCKET_PATH, username);
// 创建套接字
if ((server_fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket error");
exit(EXIT_FAILURE);
}
// 绑定套接字
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, path, sizeof(addr.sun_path)-1);
unlink(path); // 确保路径可用
if (bind(server_fd, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
perror("bind error");
exit(EXIT_FAILURE);
}
// 监听
if (listen(server_fd, MAX_CLIENTS) == -1) {
perror("listen error");
exit(EXIT_FAILURE);
}
printf("Waiting for incoming messages as [%s]...\n", username);
while (1) {
// 接受连接
if ((client_fd = accept(server_fd, NULL, NULL)) == -1) {
perror("accept error");
continue;
}
// 接收消息
if (read(client_fd, &msg, sizeof(msg)) > 0) {
printf("\n[Message from %s]: %s\n", msg.sender, msg.text);
printf("Reply to %s> ", msg.sender);
fflush(stdout);
}
close(client_fd);
}
}
void send_message(const char *target_user, const char *username) {
struct sockaddr_un addr;
int fd;
struct message msg;
void send_message(const char *target_user, const char *username) {
struct sockaddr_un addr;
int fd;
struct message msg;
// 设置目标套接字路径
char path[128];
snprintf(path, sizeof(path), "%s%s", SOCKET_PATH, target_user);
// 创建套接字
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
perror("socket error");
exit(EXIT_FAILURE);
}
// 连接目标
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strncpy(addr.sun_path, path, sizeof(addr.sun_path)-1);
if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
perror("connect error");
printf("User %s is not available or not running talk\n", target_user);
exit(EXIT_FAILURE);
}
// 发送消息
strncpy(msg.sender, username, sizeof(msg.sender)-1);
printf("Enter message (Ctrl+D to end): ");
fgets(msg.text, sizeof(msg.text), stdin);
if (write(fd, &msg, sizeof(msg)) == -1) {
perror("write error");
}
close(fd);
}
int main(int argc, char *argv[]) {
if (argc < 2) {
fprintf(stderr, "Usage: %s <username> [target_user]\n", argv[0]);
fprintf(stderr, "Server mode: %s yourname\n", argv[0]);
fprintf(stderr, "Client mode: %s yourname target_user\n", argv[0]);
exit(EXIT_FAILURE);
}
// 获取当前用户名
strncpy(current_user, argv[1], sizeof(current_user)-1);
signal(SIGINT, handle_signal);
signal(SIGTERM, handle_signal);
if (argc == 2) {
// 服务端模式
run_server(argv[1]);
} else {
// 客户端模式
send_message(argv[2], argv[1]);
}
return 0;
}三、Opencv
1、简单安装版（适合新手安装）
1、打开Terminal输入以下命令
bash
sudo apt update
sudo apt install python3-opencv libopencv-dev2、验证安装是否成功
bash
# 检查Python环境
python3 -c "import cv2; print(cv2.__version__)"
# 检查C++开发环境
pkg-config --modversion opencv4
如图所示，安装的是4.2.0。这个方法安装的Opencv版本较老，可以选择去官网下载较新的版本安装，只不过我这里尝试了很久没有安装成功，并且每次最后都会导致虚拟机卡死
2、打开VScode
1、创建一个新的python文件
案例测试
bash
import cv2
# Load an image from file
image = cv2.imread('example.jpg')
# Check if the image was successfully loaded
if image is None:
print("Error: Could not load the image. Please check the file path.")
else:
# Apply a grayscale effect
gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
# Apply a Gaussian blur effect
blurred_image = cv2.GaussianBlur(image, (15, 15), 0)
# Display the original image
cv2.imshow('Original Image', image)
# Display the grayscale image
cv2.imshow('Grayscale Image', gray_image)
# Display the blurred image
cv2.imshow('Blurred Image', blurred_image)
# Wait for a key press and close the windows
cv2.waitKey(0)
cv2.destroyAllWindows()以下是一个示例代码，添加了一些简单的图像特效（如将图像转换为灰度图像和应用高斯模糊）：
python
import cv2
# Load an image from file
image = cv2.imread('example.jpg')
# Check if the image was successfully loaded
if image is None:
print("Error: Could not load the image. Please check the file path.")
else:
# Apply a grayscale effect
gray_image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
# Apply a Gaussian blur effect
blurred_image = cv2.GaussianBlur(image, (15, 15), 0)
# Display the original image
cv2.imshow('Original Image', image)
# Display the grayscale image
cv2.imshow('Grayscale Image', gray_image)
# Display the blurred image
cv2.imshow('Blurred Image', blurred_image)
# Wait for a key press and close the windows
cv2.waitKey(0)
cv2.destroyAllWindows()特效说明：
- 灰度图像 ：使用
cv2.cvtColor将彩色图像转换为灰度图像。 - 高斯模糊 ：使用
cv2.GaussianBlur对图像进行模糊处理，参数(15, 15)控制模糊的程度。
如下图所示
同样这个也可以通过C++实现，但是我尝试了很久，被各种配置困了很久还么解决，就用的Python