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PrintSample17.html

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>WEB打印控件LODOP的样例十七:直接读写端口数据</title>

<script language="javascript" src="LodopFuncs.js"></script>
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<h2><font color="#009999">演示直接读写端口数据（如发指令到打印设备）：</font>
</h2>
<h3><font color="#009999">方式一：利用打印机驱动传递</font></h3>
<p>向打印机发送原始数据的函数格式是： <font color="#0000FF">SEND_PRINT_RAWDATA(strRawData)</font></p>
<p>参数含义:<font color="#0000FF">strRawData：</font>数据或指令值，字符（JS中可用String的fromCharCode方法生成）型。</p>
<p><b>演示如下：</b></p>
数据内容：<input type="text" id="T1" size="20" value="&amp;l1O Hello world!">
<p>先选打印设备(可参考<a href="PrintSample7.html">样例七</a>),这里<a href="javascript:MySelect()">弹出窗口选打印机</a>
选择后<a href="javascript:MySendData()">开始发送</a>。
</p>
<h3><font color="#009999">方式二：直接写端口</font></h3>
<p>直接写端口的函数格式是： <font color="#0000FF">WRITE_PORT_DATA(strPortName，strData)</font></p>
<p>参数含义:</p>
<p><font color="#0000FF">strPortName：</font>端口名，譬如&quot;LPT1&quot;&quot;COM1&quot;等等。</p>
<p><font color="#0000FF">strData：</font>数据或指令值，字符型。</p>

<p><b>下面演示向LPT1端口写如下控制字符：</b></p>

<p>CHR(27)+&quot;J&quot;+CHR(0)+CHR(60)+CHR(255) <a href="javascript:MyWritePort()">开始写入端口</a></p>

<p><b>读写COM端口前可能需要设置参数：</b></p>

<p>用关键字“mode com1”<a href="javascript:MyWriteCom()">设置COM1的参数如下</a>：2400,n,8,1</p>

<p><font color="#009999"><b>方式三：从端口读数据</b></font></p>

<p>从端口读数的函数格式是： <font color="#0000FF">READ_PORT_DATA(strPortName)</font></p>
<p>参数含义:<font color="#0000FF">strPortName：</font>端口名。</p>

<p><input type="button" value="从COM1读数：" onclick="javascript:document.getElementById('data1').value=MyReadComData()"><br>
<textarea rows="4" id="data1" cols="48"></textarea></p>


<p><a href="PrintSampIndex.html">&lt;&lt;回样例目录</a>
</p>

<script language="javascript" type="text/javascript">
        var LODOP; //声明为全局变量
	function MySelect() {
		LODOP=getLodop();
		LODOP.SELECT_PRINTER();

	};
	function MySendData() {
		LODOP=getLodop();
		strData=String.fromCharCode(27)+document.getElementById("T1").value;
		LODOP.SET_PRINT_MODE("SEND_RAW_DATA_ENCODE","UTF-8");//UTF-8 UTF-7 UNICODE ANSI UTF-16 UTF-16BE GBK BIG5 EUC-JP
		if (LODOP.SEND_PRINT_RAWDATA(strData))
		 alert("发送命令成功！"); else alert("发送命令失败！");

	};
	function MyWritePort() {
		LODOP=getLodop();
	    strData=String.fromCharCode(27)+"J"+String.fromCharCode(0)+String.fromCharCode(60)+String.fromCharCode(255);
		if (LODOP.WRITE_PORT_DATA("LPT1",strData))
		 alert("写端口成功！"); else alert("写端口失败!");

	};
	function MyWriteCom() {
		LODOP=getLodop();
 	        strConfig="mode com1:2400,n,8,1";
		if (LODOP.WRITE_PORT_DATA("COM1",strConfig))
		 alert("设置端口参数成功！"); else alert("设置端口参数失败,LastErrorID:"+LODOP.GET_SYSTEM_INFO("GetLastError"));

	};
	function MyReadComData() {
		LODOP=getLodop();
		//设置读时限2000毫秒（写时限1000毫秒）
		if (!LODOP.WRITE_PORT_DATA("COM1","mode com1:2400,n,8,1,2000,1000"))
		return "设置通讯参数失败,LastErrorID:"+LODOP.GET_SYSTEM_INFO("GetLastError"); else
		{
       		   strData=LODOP.READ_PORT_DATA("COM1");
		   if (strData=="") return "端口数据空";else return strData;
		}

	};
</script>
</body>
</html>