Desktop Development on Coinidea's Blog

[C#]Serial Port Send and Receive Data

Mon, 17 Jul 2017 14:12:53 +0000

Client Class

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;

namespace COMClient
{
 public class COMClient
 {
 private SerialPort sp = null;

 public COMClient(string COM)
 {
 this.sp = new SerialPort(COM);
 // Open a new serial port connection
 this.sp.Open();
 // Discard data from the serial driver's receive buffer
 this.sp.DiscardInBuffer();
 // Discard data from the serial driver's transmit buffer
 this.sp.DiscardOutBuffer();
 }

 ~COMClient()
 {
 // Close the port connection
 this.sp.Close();
 }

 public void sendMsg(string msg)
 {
 // Write the specified number of bytes to the serial port using buffer data
 this.sp.WriteLine(msg);
 }
 }
}

Client call:

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COMClient.COMClient com_client = new COMClient.COMClient("COM4");
com_client.sendMsg("Hello World!");

Server:

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;

namespace COM_Server
{
 class Program
 {
 static void Main(string[] args)
 {
 // Iterate through the serial port name array
 foreach (string port in System.IO.Ports.SerialPort.GetPortNames())
 {
 Console.WriteLine(port);
 }

 byte[] b = new byte[32];
 SerialPort sp = new SerialPort("COM3");

 while (true)
 {
 // Open a new serial port connection
 sp.Open();
 // Discard data from the serial driver's receive buffer
 sp.DiscardInBuffer();
 // Discard data from the serial driver's transmit buffer
 sp.DiscardOutBuffer();
 // Read bytes from the serial input buffer and write them at the specified offset in a byte array
 string msg = sp.ReadLine();
 StringBuilder sb = new StringBuilder();
 Console.Write(msg);
 // Close the port connection
 sp.Close();
 // Suspend the current thread for 500 milliseconds
 System.Threading.Thread.Sleep(500);
 }
 }
 }
}

A virtual serial port is needed here — just install VSPD. Here we configure virtual serial ports COM3 and COM4:

Server startup screenshot:

Client sending screenshot:

Server receiving screenshot:

[Java] Creating a Maven Project in IntelliJ IDEA

Thu, 28 Apr 2016 07:04:11 +0000

IntelliJ IDEA Version: 15.0

I had been using Eclipse/MyEclipse for Java and Android development, and heard that IntelliJ IDEA is also an excellent IDE. It is a product from the company behind PHPStorm.

What is Maven?

I only recently started using it. I hadn’t written much Java before – I did some JSP during my undergraduate years and wrote some Android code recently. But Java has a rather serious issue with library dependency management, and there are so many library versions. I remember frequently downloading libraries from various places online, then using build path to add external libraries. This approach leads to messy library management, poor version control, and makes it difficult to share code. Maven is a project management tool that handles library versions and dependencies very well.

Creating a Maven Project

File -> New -> Project, select Maven.

If you need to specify the project type such as app or webapp, check “Create from archetype” and select the corresponding type.
Enter GroupId and ArtifactId.

My understanding is that GroupId is the name of the overall parent project or organization the project belongs to, and ArtifactId is the name and purpose of the current project.
Enter the project folder name and path
After creating the Maven project, click “Enable Auto-Import” on the main screen. Otherwise, Maven-managed libraries won’t be automatically imported into the project and will need to be imported manually, which is inconvenient.
View -> Tool Window -> Maven Projects will open a tool window. The main functions you’ll use are clean and compile.
You can use the built-in Maven or your own downloaded Maven. If you want to use your own, go to File -> Settings.

Configure the project pom file

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>com.coinidea</groupId>
 <artifactId>maven.text</artifactId>
 <version>1.0-SNAPSHOT</version>

 <!-- properties version -->
 <properties>
 <spring.version>4.2.5.RELEASE</spring.version>
 <hadoop.version>2.5.0-cdh5.3.2</hadoop.version>
 <hive.version>0.13.1-cdh5.3.2</hive.version>
 </properties>
 <dependencies>
 <!-- junit -->
 <dependency>
 <groupId>junit</groupId>
 <artifactId>junit</artifactId>
 <version>3.8.1</version>
 <scope>test</scope>
 </dependency>
 <!--spring-->
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-context</artifactId>
 <version>${spring.version}</version>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-core</artifactId>
 <version>${spring.version}</version>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-web</artifactId>
 <version>${spring.version}</version>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-webmvc</artifactId>
 <version>${spring.version}</version>
 </dependency>
 <dependency>
 <groupId>org.springframework</groupId>
 <artifactId>spring-test</artifactId>
 <version>${spring.version}</version>
 </dependency>
 </dependencies>
 <!-- Specify maven repository -->
 <repositories>
 <repository>
 <id>people.apache.snapshots</id>
 <url>http://repository.apache.org/content/groups/snapshots-group/</url>
 <releases>
 <enabled>false</enabled>
 </releases>
 <snapshots>
 <enabled>true</enabled>
 </snapshots>
 </repository>
 </repositories>
</project>

Click clean and compile, and the libraries will be downloaded to your local Maven repository and automatically imported into the current project.

MFC Implementation of the WordGame Typing Game

Thu, 03 Sep 2015 15:18:16 +0000

GitHub download link: https://github.com/hujiulin/TypingGame

Double-click to run the program. The main interface will appear:
Click the “User” menu to perform Login and Register operations. If you have not registered, you can register first and then log in. Here we use UserName as an example.

Click Login to open the login window:

Click Register to open the registration window (or click the Register button directly):

Enter Username: UserName; Nickname: UserName; Password: UserName; as shown below:

Click OK to complete registration.

Log in with the UserName account, and you will see the following information in the upper-right corner of the main interface:
Configure game settings: . In the game options, you can set “Game Difficulty”, “Image Category”, and “Background Music”.
- Game Difficulty:
  
  Click the Game Difficulty button to open the following dialog:
  
  You can use the dropdown lists to configure “Vocabulary Size”, “Spelling Difficulty”, “Word Frequency”, and “Movement Speed”. Vocabulary size options are 50, 100, and 150. Spelling difficulty currently uses random CET-4 words. Word frequency can be single or double. Movement speed can be fast, medium, or slow. Click Set to apply.
- Image Category:
  
  Click the Image Category button to open the following dialog:
  
  Currently available images include balloons and fish. Select a radio button to choose.
- Background Music:
  
  Click the Background Music button to open the following dialog:
  
  Select the desired music in the group box and click “Select Music”.
  
  The configured game options will be displayed at: .
Click to open the following window:

This shows the top five highest-scoring users in the system.
, the Help menu has two sections: Game Rules and About.
- Game Rules:
- About:
This area shows the current game state: Started or Stopped.
Click these two buttons to start or exit the game.
Below is a screenshot taken during gameplay:

Open-Source Snake Game in WIN32 and jQuery

Thu, 03 Sep 2015 15:13:45 +0000

This is a simple snake game available in both WIN32 and JavaScript versions. The WIN32 version was written in 2010 – small but complete. Looking back, I’m quite impressed with myself from over five years ago. The jQuery version was written in 2015.

GitHub download link: https://github.com/hujiulin/snake

jQuery demo: http://www.coinidea.com/game/snake/

The overall interface looks like this:

WIN32 Version:

jQuery Version:

WIN32 Framework Code:

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#include <windows.h>
#include <math.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow) {
 WNDCLASS wndclass;
 char strClassName[] = "hungry snake";
 char strWindowName[] = "贪吃蛇";
 HWND hwnd;
 MSG msg;

 wndclass.cbClsExtra = 0;
 wndclass.cbWndExtra = 0;
 wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
 wndclass.hCursor = LoadCursor(hInstance,IDC_ARROW);
 wndclass.hIcon = LoadIcon(hInstance,IDI_APPLICATION);
 wndclass.hInstance = hInstance;
 wndclass.lpfnWndProc = WndProc;
 wndclass.lpszClassName = strClassName;
 wndclass.lpszMenuName = NULL;
 wndclass.style = 0;

 if(!RegisterClass(&wndclass)) {
 MessageBeep(0);
 return FALSE;
 }

 hwnd = CreateWindow(
 strClassName,
 strWindowName,
 WS_OVERLAPPEDWINDOW,
 CW_USEDEFAULT,
 CW_USEDEFAULT,
 CW_USEDEFAULT,
 CW_USEDEFAULT,
 NULL,
 NULL,
 hInstance,
 NULL
 );

 ShowWindow(hwnd,nCmdShow);
 UpdateWindow(hwnd);

 while(GetMessage(&msg,NULL,0,0)) {
 TranslateMessage(&msg);
 DispatchMessage(&msg);
 }

 return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam) {
 HDC hdc;
 PAINTSTRUCT ps;
 HBRUSH hBrush;
 HPEN hPen;
 switch(msg) {
 case WM_LBUTTONDOWN:
 case WM_RBUTTONDOWN:
 case WM_CHAR:
 case WM_PAINT:
 InvalidateRect(hwnd,NULL,1);
 break;
 case WM_DESTROY:
 PostQuitMessage(0);
 break;
 default:
 return DefWindowProc(hwnd,msg,wParam,lParam);
 }
 return 0;
}

Snake Definition

The entire snake is a List, with a head squarehead, a direction with four possible values, a speed, and the current snake length List.size().

Collision Detection

When the snake’s head encounters a randomly generated square in the current direction, it means food has been eaten.
When the snake turns back and hits its own body, or hits the boundary, the game is over.

Data Visualization Plugin Based on World Wind

Thu, 03 Sep 2015 15:11:46 +0000

Sample components built on open-source data visualization libraries (MSChart, VTK, D3), with a World Wind plugin that invokes these components.

GitHub download link: https://github.com/hujiulin/WorldWind_DataVisualization

1. Load Plugin

2. DataVisualization2D Component

3. DataVisualization3D Component

4. DataVisualizationWEB Component

Original link: http://cesiumcn.org/topic/207.html | China mirror: http://cesium.coinidea.com/topic/207.html

[WorldWind]1. Getting Started with WorldWind -- Compiling WorldWind and Fixing Encoding Issues

Sun, 23 Aug 2015 03:01:39 +0000

The World Wind GitHub source code used in this article can be downloaded at: https://github.com/hujiulin/WorldWind

World Wind, led by the National Aeronautics and Space Administration (NASA), is an open-source geographic information system project developed collaboratively by developers worldwide. Developed by NASA Research and promoted by NASA Learning Technologies, it displays satellite imagery, electronic maps, terrain maps, and other geographic data on a 3D digital globe. It is designed for data integration across industries, supports WMS, WFS, WMTS, and other services, and is an excellent 3D client framework rendering engine. It uses XML for data description and configuration, offering good versatility and extensibility. World Wind currently has two versions: one based on .NET and one based on Java. Beyond its basic 3D globe functionality, World Wind is highly extensible with various plugins, supporting map data (satellite, electronic, terrain) published by Google, Microsoft, and others.

This article primarily addresses issues related to compiling, running, and fixing Chinese character encoding problems in World Wind.

Downloading the Source Code, Configuring the Environment, and Compiling [Use an international network connection in case the servers are inaccessible]

Downloading the Source Code

WorldWind has both .Net and Java versions. NASA’s official website is: http://worldwind.arc.nasa.gov/java/

It provides Java version source code downloads.

.Net version source code download:

http://worldwind31.arc.nasa.gov/svn/trunk/WorldWind/

This provides an SVN repository. It is recommended to use SVN for downloading.

Note: The above SVN was found through the wiki at http://www.worldwindcentral.com/wiki/Source_code.

Environment Configuration

DirectX9 must be installed beforehand.

Compiling the Source Code

Encoding issues: You will encounter many syntax errors related to strings, caused by file encoding problems.
- Right-click the file in VS Solution Explorer
- Select “Open With”
- Choose “CSharp Editor with Encoding”
- Select “Western European (Windows) - Code Page 1252”
- Open the file – no more garbled characters
- Change the file save encoding to UTF-8 via the File menu, then save the source file
  
  Note: About 6 files are affected.
LoaderLock issue:
- Menu (Debug -> Exceptions) -> Exceptions window -> ManagedDebuggingAssistants -> Uncheck the LoaderLock option
Registry permission issue:
- Open the HtmlEditor project properties, and uncheck “Register for COM interop” in the “Build” tab
Start running the program. Everything works fine, but transitioning from the initialization screen to the main program takes a long time. This is because the WorldWind server is not accessible from China. WorldWind provides an offline mode, and you can also modify the WMS server URL in the XML. The temporary solution used here is to comment out the following two lines of code:
- In Worldwind -> PluginSDK -> ConfigurationLoader.cs, line 262:
- Line 321:
When running the program, the Initializing splash screen is misaligned:
- Debugging reveals the issue is in worldwind.cs, in public MainApplication() [line 563]:
- Using the splash form.
Splash form:
- Splash constructor:
- You can see the PictureBox code is commented out, and there is no PictureBox control on the form.
  
  It uses:
  
  Adjust the image as shown above, and the program starts normally.
Decided to back up the source code to Baidu Cloud and my own SVN server. [The upload to Baidu’s server did not succeed.]
After migrating the WorldWind source code, an issue occurred:
- Rebuilding and cleaning the project did not help.
- Solution:
  - Delete this file:
  - After deletion, reconfigure:
Issue resolved.
- Note: The first time you run the program, you may need to wait a moment.
- If references such as AVIFile.dll or FlickrNel.dll are missing, switch from Release mode to Debug mode to compile and run successfully. [The actual reason is that the corresponding DLLs need to be copied to the Release directory.]
- When fixing encoding issues, some people encounter a situation where the degree symbol in the main interface displays as garbled characters. This is because the encoding issue has not been fully resolved. Please save with “UTF-8 with BOM” in the “Advanced Save Options” to fix this.

Files with Encoding Issues:

Project	File
WorldWind	Compass3D.cs
WorldWind	GPSTrackerPlugin.WorldWind.cs
WorldWindow	WorldWindow.cs
PluginSDK	ConfigurationLoader.cs
PluginSDK	Angle.cs

All encoding issues resolved:

Today I compiled the code from SVN on an x64 machine, and the program would not run. The debugger showed the error:

“Unhandled exception of type ‘System.BadImageFormatException’”

Solution:

Change from Any CPU or x64 mode to x86, then set the output path to “..binDebug”

Rebuild the solution, compile and run successfully:

Original link: http://cesiumcn.org/topic/206.html | Fast access in China: http://cesium.coinidea.com/topic/206.html

Bookworm Helper Tool

Thu, 12 Feb 2015 15:54:15 +0000

While organizing old files recently, I stumbled upon a small program I wrote around 2011.

Have you ever played a game called Bookworm? It’s made by PopCap. The game tells the story of a bookworm defeating a demon, and to progress and fight bosses, you need to spell words. If I recall correctly, you’re given a 3x3 or 4x4 matrix containing letters a-z or * (representing any letter), and you need to spell the longest word possible – the longer the word, the more damage dealt to the demon. So I wrote a little program to help my not-so-great vocabulary spell the longest words possible. It requires a word list as a prerequisite; there’s a dictionary.txt in the project’s doc folder containing about 7000+ words that needs to be loaded first.

Main program interface:

Loading the dictionary:

Entering characters:

Getting the result list:

GitHub: https://github.com/hujiulin/Bookworm

Project notes:

Written in C++ around 2011 [the code is a bit messy]. Can be opened with VC 6.0 or Visual Studio.
This program finds the longest possible words.
Input letters [a-z or *] to get a list of answers. [* represents any letter]
This was my first ever small program. I recently found it among old files, so I’m sharing it here :).

Batch Word to HTML -- ConvertWordToHTML [Update: Word Converter Tool]

Sun, 11 Jan 2015 10:34:33 +0000

I recently had a requirement to batch convert Word files to HTML.

For a small number of Word files, you can simply use Word’s built-in “Save As” feature. But when dealing with a large number of Word files, it becomes quite complicated.

After searching online, I found solutions in PHP, Python, Ruby, and C#. Among them, I found a tool called “Xunjiie Converter”, but it didn’t quite fit my needs, so I decided to write my own. Since Word is a Microsoft product, I figured C# might be the best choice for this task.

I open-sourced a GUI-based solution on GitHub: https://github.com/hujiulin/ConvertWordToHTML [Currently single-threaded; will be converted to multi-threaded later].

Screenshots of the running application:

Initial program interface:
“Open” to select an input folder containing Word documents:
“SaveAs” to select an output folder:
Program finished running:
Input and output results:

Program notes:

Dependencies: Windows OS, .NET Framework 3.5, Office Word
Word’s “Save As HTML” offers several format options: single web page (mht), web page (htm), and filtered web page (htm). I chose the filtered HTML option, which converts all formulas to gif or jpg images. A properly filtered htm file won’t contain Microsoft’s messy formatting information.

GitHub: https://github.com/hujiulin/ConvertWordToHTML

Download: http://devhu-github.stor.sinaapp.com/ConvertWordToHTML.rar

2015-1-24 Update:

Rename solution and project to WordConverter; Add feature: convert word to PDF; ADD feature switch specified ext;

The Word Converter tool now supports both HTML and PDF formats.

Updated GitHub link: https://github.com/hujiulin/WordConverter

Download: http://devhu-github.stor.sinaapp.com/WordConverter.rar