项目 4 任务 2 网络摄像机：PictureBox、Image / Bitmap、照片列表
- 摄像头：自绘东围墙场景（Camera/scene.svg），按云台位置切成 640×480 帧（build-frames.ts）； Pan 每次转一格，红外对射被遮挡时画面出现翻墙的人；类名、委托、事件参数与教材 dll 一致， ImageRead 每 250 ms 在后台线程触发 - Image / Bitmap 保存真实图片数据：Save、FromFile、FromStream，文件夹不存在时报 GDI+ 一般性错误； 图片每张只发给浏览器一次（按内容哈希缓存） - 程序所在目录（AppDomain.CurrentDomain.BaseDirectory，编译检查单独放行）和当前目录指向可写的 bin/Debug， 沙箱里在沙箱的临时目录 - PictureBox（SizeMode、BorderStyle）；设计器工具箱加"图片框"；运行区显示程序保存的图片，点开看大图； 实训台摄像头图标显示开启状态 - 评分规则加图片框显示图片、摄像头开关与转向、保存图片三种检查；示例 p4-t2-网络摄像机 - 测试：摄像头端到端、图片读写与程序目录、AppDomain 编译检查、评分出错情况 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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namespace 网络摄像机
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{
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partial class Form1
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{
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/// <summary>
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/// 必需的设计器变量。
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/// </summary>
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private System.ComponentModel.IContainer components = null;
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/// <summary>
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/// 清理所有正在使用的资源。
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/// </summary>
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/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
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protected override void Dispose(bool disposing)
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{
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if (disposing && (components != null))
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{
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components.Dispose();
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}
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base.Dispose(disposing);
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}
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#region Windows 窗体设计器生成的代码
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/// <summary>
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/// 设计器支持所需的方法 - 不要
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/// 使用代码编辑器修改此方法的内容。
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/// </summary>
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private void InitializeComponent()
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{
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this.pictureBox1 = new System.Windows.Forms.PictureBox();
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this.btn_up = new System.Windows.Forms.Button();
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this.btn_left = new System.Windows.Forms.Button();
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this.btn_right = new System.Windows.Forms.Button();
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this.btn_down = new System.Windows.Forms.Button();
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this.btn_camera = new System.Windows.Forms.Button();
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this.btn_open = new System.Windows.Forms.Button();
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this.label1 = new System.Windows.Forms.Label();
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this.txt_ip = new System.Windows.Forms.TextBox();
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((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
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this.SuspendLayout();
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//
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// pictureBox1
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//
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this.pictureBox1.BackColor = System.Drawing.Color.Black;
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this.pictureBox1.Location = new System.Drawing.Point(25, 41);
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this.pictureBox1.Name = "pictureBox1";
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this.pictureBox1.Size = new System.Drawing.Size(640, 480);
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this.pictureBox1.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage;
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this.pictureBox1.TabIndex = 0;
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this.pictureBox1.TabStop = false;
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//
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// btn_up
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//
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this.btn_up.Location = new System.Drawing.Point(763, 166);
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this.btn_up.Name = "btn_up";
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this.btn_up.Size = new System.Drawing.Size(33, 33);
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this.btn_up.TabIndex = 1;
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this.btn_up.Text = "↑";
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this.btn_up.UseVisualStyleBackColor = true;
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this.btn_up.Click += new System.EventHandler(this.btn_up_Click);
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//
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// btn_left
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//
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this.btn_left.Location = new System.Drawing.Point(707, 219);
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this.btn_left.Name = "btn_left";
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this.btn_left.Size = new System.Drawing.Size(33, 33);
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this.btn_left.TabIndex = 2;
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this.btn_left.Text = "←";
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this.btn_left.UseVisualStyleBackColor = true;
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this.btn_left.Click += new System.EventHandler(this.btn_left_Click);
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//
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// btn_right
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//
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this.btn_right.Location = new System.Drawing.Point(820, 219);
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this.btn_right.Name = "btn_right";
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this.btn_right.Size = new System.Drawing.Size(33, 33);
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this.btn_right.TabIndex = 3;
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this.btn_right.Text = "→";
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this.btn_right.UseVisualStyleBackColor = true;
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this.btn_right.Click += new System.EventHandler(this.btn_right_Click);
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//
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// btn_down
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//
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this.btn_down.Location = new System.Drawing.Point(763, 268);
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this.btn_down.Name = "btn_down";
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this.btn_down.Size = new System.Drawing.Size(33, 33);
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this.btn_down.TabIndex = 4;
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this.btn_down.Text = "↓";
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this.btn_down.UseVisualStyleBackColor = true;
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this.btn_down.Click += new System.EventHandler(this.btn_down_Click);
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//
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// btn_camera
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//
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this.btn_camera.Location = new System.Drawing.Point(743, 347);
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this.btn_camera.Name = "btn_camera";
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this.btn_camera.Size = new System.Drawing.Size(75, 33);
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this.btn_camera.TabIndex = 7;
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this.btn_camera.Text = "拍照";
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this.btn_camera.UseVisualStyleBackColor = true;
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this.btn_camera.Click += new System.EventHandler(this.btn_camera_Click);
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//
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// btn_open
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//
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this.btn_open.Location = new System.Drawing.Point(763, 219);
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this.btn_open.Name = "btn_open";
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this.btn_open.Size = new System.Drawing.Size(33, 33);
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this.btn_open.TabIndex = 9;
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this.btn_open.Text = "开";
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this.btn_open.UseVisualStyleBackColor = true;
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this.btn_open.Click += new System.EventHandler(this.btn_open_Click);
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//
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// label1
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//
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this.label1.AutoSize = true;
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this.label1.Location = new System.Drawing.Point(685, 69);
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this.label1.Name = "label1";
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this.label1.Size = new System.Drawing.Size(53, 12);
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this.label1.TabIndex = 10;
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this.label1.Text = "摄像机IP";
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//
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// txt_ip
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//
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this.txt_ip.Location = new System.Drawing.Point(744, 66);
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this.txt_ip.Name = "txt_ip";
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this.txt_ip.Size = new System.Drawing.Size(111, 21);
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this.txt_ip.TabIndex = 11;
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//
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// Form1
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//
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this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
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this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
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this.ClientSize = new System.Drawing.Size(884, 562);
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this.Controls.Add(this.txt_ip);
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this.Controls.Add(this.label1);
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this.Controls.Add(this.btn_open);
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this.Controls.Add(this.btn_camera);
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this.Controls.Add(this.btn_down);
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this.Controls.Add(this.btn_right);
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this.Controls.Add(this.btn_left);
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this.Controls.Add(this.btn_up);
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this.Controls.Add(this.pictureBox1);
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this.Name = "Form1";
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this.Text = "网络摄像机";
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this.Load += new System.EventHandler(this.Form1_Load);
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((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
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this.ResumeLayout(false);
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this.PerformLayout();
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}
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#endregion
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private System.Windows.Forms.PictureBox pictureBox1;
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private System.Windows.Forms.Button btn_up;
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private System.Windows.Forms.Button btn_left;
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private System.Windows.Forms.Button btn_right;
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private System.Windows.Forms.Button btn_down;
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private System.Windows.Forms.Button btn_camera;
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private System.Windows.Forms.Button btn_open;
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private System.Windows.Forms.Label label1;
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private System.Windows.Forms.TextBox txt_ip;
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}
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}
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@@ -0,0 +1,85 @@
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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using System.IO;
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using DeviceCtrlLibrary;
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namespace 网络摄像机
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{
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public partial class Form1 : Form
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{
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public Form1()
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{
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InitializeComponent();
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}
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static string CameraPath = AppDomain.CurrentDomain.BaseDirectory + "Camera/";//拍照保存路径
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static string IpCameraIPAddress = "192.168.14.131";//网络摄像机IP
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bool IsOpen = false;
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Image ReadImage = null;//存储摄像机图片
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private void Form1_Load(object sender, EventArgs e)
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{
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//判断拍照保存文件夹是否存在，若不存在则先创建
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if (!Directory.Exists(CameraPath))
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Directory.CreateDirectory(CameraPath);
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DeviceCtrlHelper.ipCameraHelper.ImageRead += ipCameraHelper_ImageRead;//绑定图片显示事件
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}
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void ipCameraHelper_ImageRead(ImageReadEvenArgs e)
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{
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ReadImage = e.img;//保存摄像机拍到的图片
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pictureBox1.Image = ReadImage;//显示在图片框上
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}
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private void btn_open_Click(object sender, EventArgs e)
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{
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IsOpen = !IsOpen;
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if (IsOpen)
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{
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IpCameraIPAddress = txt_ip.Text;
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DeviceCtrlHelper.ipCameraHelper.Open(IpCameraIPAddress, "admin", "");//用户名admin，密码为空
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DeviceCtrlHelper.ipCameraHelper.Start();//开始传送图像
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btn_open.Text = "关";
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}
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else
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{
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DeviceCtrlHelper.ipCameraHelper.Stop();//停止传送图像
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btn_open.Text = "开";
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}
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}
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private void btn_up_Click(object sender, EventArgs e)
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{
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DeviceCtrlHelper.ipCameraHelper.PanUp();//向上转
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}
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private void btn_down_Click(object sender, EventArgs e)
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{
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DeviceCtrlHelper.ipCameraHelper.PanDown();//向下转
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}
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private void btn_left_Click(object sender, EventArgs e)
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{
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DeviceCtrlHelper.ipCameraHelper.PanLeft();//向左转
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}
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private void btn_right_Click(object sender, EventArgs e)
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{
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DeviceCtrlHelper.ipCameraHelper.PanRight();//向右转
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}
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private void btn_camera_Click(object sender, EventArgs e)
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{
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//拍照：把当前图像以时间命名保存到Camera文件夹
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if (ReadImage != null)
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ReadImage.Save(CameraPath + DateTime.Now.ToString("yyyyMMdd_HH mm ss") + ".jpg");
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}
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}
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}
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@@ -0,0 +1,22 @@
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace 网络摄像机
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{
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static class Program
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{
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/// <summary>
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/// 应用程序的主入口点。
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/// </summary>
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[STAThread]
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static void Main()
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{
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Application.EnableVisualStyles();
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Application.SetCompatibleTextRenderingDefault(false);
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Application.Run(new Form1());
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}
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}
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}
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# 评分规则：书上评价表的功能项。每项单独启动一次程序，按步骤操作，核对结果。
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# 格式说明见 server/src/grading/checks.ts
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- title: 能正确打开、关闭摄像机
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steps:
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- text: { control: txt_ip, value: 192.168.2.50 }
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- click: btn_open
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- expect: { control: btn_open, text: 关, desc: 按钮文字变成"关" }
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- expect: { camera: on }
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- click: btn_open
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- expect: { control: btn_open, text: 开, desc: 按钮文字变回"开" }
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- expect: { camera: off }
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- title: 能正确显示图像
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steps:
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- text: { control: txt_ip, value: 192.168.2.50 }
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- click: btn_open
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- expect: { control: pictureBox1, image: true, within: 3s, desc: 显示摄像机拍到的图像 }
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- title: 能控制摄像机上下左右旋转
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steps:
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- text: { control: txt_ip, value: 192.168.2.50 }
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- click: btn_open
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- click: btn_up
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- expect: { camera: up, desc: 点"↑"后向上转 }
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- click: btn_left
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- expect: { camera: left, desc: 点"←"后向左转 }
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- click: btn_down
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- click: btn_down
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- expect: { camera: down, desc: 点"↓"后向下转 }
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- click: btn_right
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- click: btn_right
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- expect: { camera: right, desc: 点"→"后向右转 }
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- title: 能抓拍摄像机当前图像
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steps:
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- text: { control: txt_ip, value: 192.168.2.50 }
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- click: btn_open
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- expect: { control: pictureBox1, image: true, within: 3s, desc: 显示摄像机拍到的图像 }
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- click: btn_camera
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- expect: { savedImage: Camera/, desc: 把照片保存到 Camera 文件夹 }
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@@ -0,0 +1,4 @@
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{
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"title": "项目4 任务2 控制网络摄像机",
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"source": "教材书 p78–81，界面取自配套参考工程，标签文字按书上表格改为“摄像机IP”；补上书上漏写的 using System.IO;"
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}
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