如何解决 asp.net 2019 读取Com 串口数据 在客户机上完成 在客户机不弹出这个提示
麻烦各位给看一下 谢谢
我的代码
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WeightMain(print).aspx.cs" Inherits="WeighManage.WeightMain_print_" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Test Print</title>
</head>
<script language="javascript" type="text/javascript">
function init() {
configPort();
document.all.printport.PortOpen = true;
//bindEvent();
}
function send(printmsg) {
document.all.printport.Output = printmsg;
}
function pageEnd() {
document.all.printport.PortOpen = false;
}
function ClosePort() {
if (document.all.printport.PortOpen == true) {
document.all.printport.PortOpen = false;
}
else {
window.alert("串口已经关闭!");
}
}
function OpenPort() {
if (document.all.printport.PortOpen == false) {
document.all.printport.PortOpen = true;
}
else {
document.all.printport.PortOpen = true;
window.alert("串口已经关闭!");
}
}
//var bindEvent = function() {
// function document.all.printport::OnComm() {
// receives(); // 触发收发事件后的处理方法
// }
// }
// 配置端口方法
function configPort() {
document.all.printport.CommPort = 1;//这相当于com1 如果是com2 等于2就可以了
document.all.printport.settings = '4800,n,7,1'; // 9600：波特率 n：奇偶位 8：数据位 1：校验位
document.all.printport.OutBufferCount = 0; //清空发送缓冲区
document.all.printport.InBufferCount = 0; //滑空接收缓冲区
document.all.printport.RThreshold = 14; //这个参数很重要，这个参数配置要符合硬件设备 该参数表示接收硬件设备多少位数据的时候触发onComm事件
}
//定时调用就行了，回调不行
function receives() {
printport.PortOpen = true;
var inputvalue = document.all.printport.Input;
//这里就是接受的数据
//console.log(inputvalue)
document.all.S1.value = inputvalue
}
</script>
<script id="clientEventHandlersJS" language="javascript">
function OnComm() {
switch (document.all.printport.CommEvent) {
case 1: { window.alert("Send OK！"); break; } //发送事件
case 2: { receives(); break; } //接收事件
default: alert("Event Raised!" + document.all.printport.CommEvent);;
}
}
</script>
<script language="javascript" for="printport" event="OnComm">
OnComm();
</script>
<body onload='init();' onunload='pageEnd();'>
<%-- <form id="form1" runat="server">
<div>
</div>
</form>--%>
<form method="post" action="--WEBBOT-SELF--">
<p>收到信息：<textarea rows="21" name="S1" cols="86"></textarea></p>
<p>
<input type="button" value="获取信息" name="B3" onclick='receives();' />
</p>
<p>发送内容：<textarea rows="1" name="S2" cols="86"></textarea></p>
<p>
<input type="button" value="发送内容" name="B1" onclick='send(document.all.S2.value);' />
</p>
<p>
<input type="button" value="关闭串口" name="B2" onclick='ClosePort();' />
<input type="button" value="打开串口" name="B2" onclick='OpenPort();' />
</p>
<p>
<object id="printport" classid="clsid:648A5600-2C6E-101B-82B6-000000000014" style="display: none">
</object>
</p>
</form>
</body>
</html>
