USB相机拍照

获取本地计算机信息的小代码，比较简单，适合初学网络编程(a simple program of geting information from computer)

实现水波特效的例子-achieve wave effects example

一套清晰的三层结构 PPT 课件 学生可以参考(C# winform Three-tier structurePPT courseware students can refer to)

c# 扫描IP Http Headerusing System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Threading;using System.IO;namespace HScan{ public partial class Form1 : Form { int _currentThreads = 0; int _maxThreads = 100; Thread main = null; Thread mt = null; List threads = new List(); public Form1() { InitializeComponent(); Control.CheckForIllegalCrossThreadCalls = false; } private void btnStart_Click(object sender, EventArgs e) { btnStart.Enabled = false; if (txtStart.Text.Trim() == "") { MessageBox.Show("起始IP不能为空."); return; } if (txtEnd.Text.Trim() == "") { MessageBox.Show("结束IP不能为空."); return; } int ts = Convert.ToInt32(txtThreads.Text); _maxThreads = ts; string startIp = txtStart.Text; string endIp = txtEnd.Text; TParameter tp=new TParameter(); tp.StartIp=startIp; tp.EndIp=endIp; tp.ThreadCount=ts; main = new Thread(new ParameterizedThreadStart(StartMe)); main.Start(tp); } protected void ThreadManage() { Thread c=null; while (true) { System.Object lockThis = new System.Object(); lock (lockThis) { for (int i = 0; i < threads.Count; i ) { if (threads[i] != null && !threads[i].IsAlive) { c = threads[i]; break; } } if (c != null) { threads.Remove(c); } } } } protected void StartMe(object ob) { mt = new Thread(new ThreadStart(ThreadManage)); mt.Start(); TParameter p = ob as TParameter; string curIp = p.StartIp; while (true) { for (int i = 0; i < _maxThreads; i ) { if (curIp != "") { if (_currentThreads >= _maxThreads) break; System.Object lockThis = new System.Object(); lock (lockThis) { _currentThreads ; if (_currentThreads > _maxThreads) _currentThreads = _maxThreads; string tip = curIp; Thread t = new Thread(new ParameterizedThreadStart(Run)); t.Start(tip); threads.Add(t); curIp = IPUtility.getLastIp(curIp, p.EndIp, 1); } } else { break; } } } } protected void Run(object ob) { string ip = ob.ToString(); SocketGetHead h = new SocketGetHead(); string ret = h.GetHtml(ip, 80); if (ret.IndexOf("DVRDVS-Webs") > 0) { ListViewItem item = new ListViewItem(); item.SubItems[0].Text = (listView1.Items.Count 1).ToString(); ListViewItem.ListViewSubItem lvSubItem = new ListViewItem.ListViewSubItem(); lvSubItem.Text = ip; item.SubItems.Add(lvSubItem); lvSubItem = new ListViewItem.ListViewSubItem(); lvSubItem.Text = "DVRDVS-Webs"; item.SubItems.Add(lvSubItem); listView1.Items.Add(item); } System.Object lockThis = new System.Object(); lock(lockThis) { lblCurIp.Text = ip; _currentThreads--; if (_currentThreads < 0) _currentThreads = 0; } } private void tsmCopy_Click(object sender, EventArgs e) { if (listView1.SelectedItems.Count > 0) { string ip = listView1.SelectedItems[0].SubItems[1].Text; Clipboard.SetText(ip); } } private void tsmExport_Click(object sender, EventArgs e) { StreamWriter writer = new StreamWriter(AppDomain.CurrentDomain.BaseDirectory "\export.txt",true); foreach (ListViewItem item in listView1.Items) { string ip=item.SubItems[1].Text; writer.WriteLine(ip); writer.Flush(); } writer.Flush(); writer.Close(); MessageBox.Show("导出成功!"); } private void Form1_FormClosing(object sender, FormClosingEventArgs e) { try { if (mt != null) { mt.Interrupt(); mt.Abort(); } foreach (Thread t in threads) { t.Interrupt(); t.Abort(); } if (main != null) { main.Interrupt(); main.Abort(); } } catch { } Thread.Sleep(5000); } private void btnStop_Click(object sender, EventArgs e) { try { if (mt != null) { mt.Interrupt(); mt.Abort(); } foreach (Thread t in threads) { t.Interrupt(); t.Abort(); } if (main != null) { main.Interrupt(); main.Abort(); } } catch { } btnStart.Enabled = true; } }}

C++反射的一种简单实现 A simple way to make cpp reflection real(A simple way to make cpp reflection real)

// 矩阵求逆在3D程序中很常见，主要应用于求Billboard矩阵。按照定义的计算方法乘法运算，严重影响了性能。在需要大量Billboard矩阵运算时，矩阵求逆的优化能极大提高性能。这里要介绍的矩阵求逆算法称为全选主元高斯-约旦法。// // 高斯-约旦法（全选主元）求逆的步骤如下：// // 首先，对于 k 从 0 到 n - 1 作如下几步：// // 从第 k 行、第 k 列开始的右下角子阵中选取绝对值最大的元素，并记住次元素所在的行号和列号，在通过行交换和列交换将它交换到主元素位置上。这一步称为全选主元。// m(k, k) = 1 / m(k, k)// m(k, j) = m(k, j) * m(k, k)，j = 0, 1, ..., n-1；j != k// m(i, j) = m(i, j) - m(i, k) * m(k, j)，i, j = 0, 1, ..., n-1；i, j != k// m(i, k) = -m(i, k) * m(k, k)，i = 0, 1, ..., n-1；i != k// 最后，根据在全选主元过程中所记录的行、列交换的信息进行恢复，恢复的原则如下：在全选主元过程中，先交换的行（列）后进行恢复；原来的行（列）交换用列（行）交换来恢复。// // 实现(4阶矩阵)

HIGHLIGHT TRUE #define NOHIGHLIGHT FALSE #define UPDATE TRUE #de

这是我的一个作业，关于C++编程的，做的是一个银行系统，能够实现存钱，取钱，转账，或者超额透支等等，是通过类来实现的(This is one of my homework, about c++ programming, do is a banking system, can realize save and withdraw money, transfer, or excessive overdraft, and so on, are realized through the class)

以STM32为MCU，在MDK开发环境下用C语言编写的RFID PN532的读卡设计，本程序可以读取S50卡的ID和存在卡中的信息，并用ZIGBEE发送出去。是运用在车载终端上的。

说明：  详细讲解keil自带的操作系统RTX,里面有很多例子,帮助想了解运用RTX系统的程序员快速掌握(Keil's own operating system, RTX, is described in detail, with a number of examples to help developers who want to know how to use the RTX system quickly.)