Joe Horn 的啟示錄

Apr 18

C# 的 ==、Equals 與 JAVA 的 ==、equals

剛感到好奇，各在 C# 與 JAVA 寫測試程式。

C#：

Object myObj1 = 1;
Object myObj2 = myObj1;
Object myObj3 = 1;

Console.WriteLine("myObj2.Equals(myObj1) = " + myObj2.Equals(myObj1));
Console.WriteLine("myObj3.Equals(myObj1) = " + myObj3.Equals(myObj1));

Console.WriteLine("(myObj2 == myObj1) = " + (myObj2 == myObj1));
Console.WriteLine("(myObj3 == myObj1) = " + (myObj3 == myObj1));

結果：

myObj2.Equals(myObj1) = True
myObj3.Equals(myObj1) = True
(myObj2 == myObj1) = True
(myObj3 == myObj1) = False

JAVA：

Object myObj1 = 1;
Object myObj2 = myObj1;
Object myObj3 = 1;

System.out.println("myObj2.equals(myObj1) = " + myObj2.equals(myObj1));
System.out.println("myObj3.equals(myObj1) = " + myObj3.equals(myObj1));

System.out.println("(myObj2 == myObj1) = " + (myObj2 == myObj1));
System.out.println("(myObj3 == myObj1) = " + (myObj3 == myObj1));

結果：

myObj2.equals(myObj1) = true
myObj3.equals(myObj1) = true
(myObj2 == myObj1) = true
(myObj3 == myObj1) = true

Technorati Tags: C#, JAVA

(Visited 3254 times)

Jan 04

[C#] 取得 wav 檔案格式

.NET No Comments »

前陣子，在工作上剛好需要對 wav 檔案格式進行判定，可是 NAudio 製作出來的格式用來作判斷又有錯誤，所以土法煉鋼寫了一個小 class：

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

class WavInfo
{
    private String _Error;
    public String Error
    {
        get
        {
            return this._Error;
        }
    }

    private Boolean _PCM;
    public Boolean PCM
    {
        get
        {
            return this._PCM;
        }
    }

    private uint _Channel;
    public uint Channel
    {
        get
        {
            return this._Channel;
        }
    }

    private uint _SampleRate;
    public uint SampleRate
    {
        get
        {
            return this._SampleRate;
        }
    }

    private uint _BitsPerSample;
    public uint BitsPerSample
    {
        get
        {
            return this._BitsPerSample;
        }
    }

    private uint _ByteRate;
    public uint ByteRate
    {
        get
        {
            return this._ByteRate;
        }
    }

    private uint _BlockAlign;
    public uint BlockAlign
    {
        get
        {
            return this._BlockAlign;
        }
    }

    public WavInfo(String FileName)
    {
        try
        {
            FileStream FS = File.OpenRead(@FileName);
            Byte[] ReadTmp = new Byte[36];

            FS.Read(ReadTmp, 0, 36);
            FS.Close();

            if (BitConverter.ToUInt16(ReadTmp, 20) == 1)
            {
                this._PCM = true;
            }

            this._Channel = BitConverter.ToUInt16(ReadTmp, 22);
            this._SampleRate = BitConverter.ToUInt32(ReadTmp, 24);
            this._BitsPerSample = BitConverter.ToUInt16(ReadTmp, 34);

            this._ByteRate = this._Channel * this._SampleRate * this._BitsPerSample / 8;
            this._BlockAlign = this._Channel * this._BitsPerSample / 8;

            this._Error = String.Empty;
        }
        catch (Exception e)
        {
             this._Error = e.ToString();
        }
    }
}