variant.java

用于串口通讯测试的工具软件。完全使用java语言编写。

package com.zcsoft.opc;

/**
 * <p>Title: 串口通信</p>
 * <p>Description: 串口通信实验</p>
 * <p>Copyright: Copyright (c) 2004－2005</p>
 * <p>Company: Zhicheng Software&Service Co. Ltd.</p>
 * @author 蒋智湘
 * @version 1.0
 */
/** 变量值存储数据类 */
public class Variant implements java.io.Serializable
{
	//数据类型定义
	/** nothing */
	//public static final short VT_VT_EMPTY = 0;
	/** SQL style Null */
	//public static final short VT_NULL	= 1;
	/** 2 byte signed int */
	public static final short VT_I2 = 2;
	/** 4 byte signed int */
	public static final short VT_I4 = 3;
//	/** 4 byte real */
//	public static final short VT_R4 = 4;
//	/** 8 byte real */
//	public static final short VT_R8 = 5;
//	/** 8 byte currency */
//	public static final short VT_CY = 6;
//	/** 8 byte date */
//	public static final short VT_DATE = 7;
//	/** OLE Automation string */
//	public static final short VT_BSTR = 8;
	//public static final short VT_DISPATCH = 9;
	//public static final short VT_ERROR = 10;//long
//	/** boolean value */
//	public static final short VT_BOOL = 11;
	//public static final short VT_VARIANT	= 12;
	//public static final short VT_UNKNOWN	= 13;
//	public static final short VT_DECIMAL = 14;//16 byte fixed point
	/** signed byte */
	public static final short VT_I1 = 16;
	/** unsigned byte */
	public static final short VT_UI1	= 17;
	/** unsigned char */
	public static final short VT_UI2	= 18;
//	/** 4 byte unsigned integer */
//	public static final short VT_UI4	= 19;
//	/** 8 byte unsigned long integer */
//	public static final short VT_I8 = 20;
	//public static final short VT_UI8	= 21;
	//public static final short VT_INT	= 22;//signed machine int
	//public static final short VT_UINT = 23;//unsigned machine int
	//public static final short VT_VOID	= 24;
	//public static final short VT_HRESULT	= 25;
	//public static final short VT_PTR = 26;
	//public static final short VT_SAFEARRAY	= 27;
	//public static final short VT_CARRAY	= 28;
	//public static final short VT_USERDEFINED	= 29;
	//public static final short VT_LPSTR = 30;
	//public static final short VT_LPWSTR	= 31;
	//public static final short VT_RECORD = 36;
	//public static final short VT_FILETIME = 64;
	/*public static final short VT_BLOB	= 65;
	public static final short VT_STREAM	= 66;
	public static final short VT_STORAGE = 67;
	public static final short VT_STREAMED_OBJECT	= 68;
	public static final short VT_STORED_OBJECT = 69;
	public static final short VT_BLOB_OBJECT = 70;
	public static final short VT_CF = 71;
	//public static final short VT_CLSID = 72;
	public static final short VT_BSTR_BLOB	= 0xfff;
	public static final short VT_VECTOR	= 0x1000;
	public static final short VT_ARRAY = 0x2000;
	public static final short VT_BYREF = 0x4000;*/
	//public static final short VT_RESERVED = (short)0x8000;
	//public static final short VT_ILLEGAL	= (short)0xffff;
	//public static final short VT_ILLEGALMASKED	= 0xfff;
	//public static final short VT_TYPEMASK	= 0xfff;

	/** 实际的数据类型 */
	final short vt;

//	public boolean zValue;

	public int iValue;

//	public long jValue;

//	public String lValue;

//	public float fValue;

//	public double dValue;

	/**
	 * 构造一个数据类型为<code>VT_I1</code>的Variant实例
	 */
	public Variant()
	{
		this(VT_I1);
	}

	/**
	 *
	 * @param vt 数据类型
	 * 数据类型同对应的值存储变量关系对照如下表
	 * <table>
	 *    <tr>
	 *       <td>VT_BOOL</td><td>zValue</td>
	 *    </tr>
	 *    <tr>
	 *       <td>VT_I1</td><td>iValue</td>
	 *    </tr>
	 *    <tr>
	 *       <td>VT_UI1, VT_I2</td><td>iValue</td>
	 *    </tr>
	 *    <tr>
	 *       <td>VT_UI2，VT_I4</td><td>iValue</td>
	 *    </tr>
	 *    <tr>
	 *       <td>VT_UI4, VT_I8</td><td>jValue</td>
	 *    </tr>
	 *    <tr>
	 *       <td>VT_CY</td><td>jValue</td>
	 *    </tr>
	 *    <tr>
	 *       <td>VT_DATE</td><td>jValue</td>
	 *    </tr>
	 *    <tr>
	 *       <td>VT_BSTR</td><td>lValue</td>
	 *    </tr>
	 *    <tr>
	 *       <td>VT_R4</td><td>fValue</td>
	 *    </tr>
	 *    <tr>
	 *       <td>VT_R8</td><td>dValue</td>
	 *    </tr>
	 * </table>
	 */
	public Variant(short vt)
	{
		this.vt = vt;
	}

//	public Variant copy()
//	{
//		return new Variant(vt);
//	}

	public short getValueType()
	{
		return vt;
	}

//	/**
//	 *
//	 * @param value 新的变量值
//	 * @return 返回修改前值
//	 */
//	public int setIntValue(int value)
//	{
//		int old = this.iValue;
//		if(old != value)
//		{
//			this.iValue = value;
//		}
//		return old;
//	}

	public String toString()
	{
		String s;
		switch (vt)
		{
			case VT_I1://该类型最常用
			case VT_UI2:
			case VT_I4://前三者常用
			case VT_UI1:
			case VT_I2:
				s = String.valueOf(iValue);
				break;
//			case VT_UI4:
//			case VT_I8:
//				s = String.valueOf(jValue);
//				break;
			default:
				s = "";
		}
		return s;
	}

//	public int intValue()
//	{
//		return iValue;
//	}
}