串口操作，提示“指定的转化无效”
1
悬赏园豆：15
[待解决问题]
<title>我是title</title> <script type="text/javascript"> window.onload = function () { document.getElementById("Object1").RegJs(window, "Show"); //将页面对象，和所需调用的js方法名传给activex } //activex调用的js方法 function Show(str) { document.getElementById("text1").value = str; } </script> </head> <body> <form id="form1" runat="server"> <div> <object id="Object1" classid="clsid:82611CA0-938D-4AC8-A6B1-17D4313E8C31" width="500" height="100" codebase="/lib/setup.exe"> </object> <input type="text" id="text1" /> </div> </form>
using System; using System.Collections.Generic; using System.ComponentModel; using System.Drawing; using System.Data; using System.Linq; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; using System.Security; using System.Threading; using mshtml; using System.Reflection; namespace CardReaderControl { [Guid("82611CA0-938D-4AC8-A6B1-17D4313E8C31")] public partial class UserControl1 : UserControl, IObjectSafety { public string InputEnd { get; set; } SHDocVw.ShellWindows sws = new SHDocVw.ShellWindows(); private IHTMLWindow2 temphtml = null; private string functionstr = ""; public void RegJs(object win, string fuc) { temphtml = (IHTMLWindow2)win; if (temphtml != null && !string.IsNullOrEmpty(fuc)) { functionstr = fuc; } else { temphtml = null; functionstr = ""; MessageBox.Show("注册脚本失败！"); } } #region IObjectSafety 成员 private const string _IID_IDispatch = "{00020400-0000-0000-C000-000000000046}"; private const string _IID_IDispatchEx = "{a6ef9860-c720-11d0-9337-00a0c90dcaa9}"; private const string _IID_IPersistStorage = "{0000010A-0000-0000-C000-000000000046}"; private const string _IID_IPersistStream = "{00000109-0000-0000-C000-000000000046}"; private const string _IID_IPersistPropertyBag = "{37D84F60-42CB-11CE-8135-00AA004BB851}"; private const int INTERFACESAFE_FOR_UNTRUSTED_CALLER = 0x00000001; private const int INTERFACESAFE_FOR_UNTRUSTED_DATA = 0x00000002; private const int S_OK = 0; private const int E_FAIL = unchecked((int)0x80004005); private const int E_NOINTERFACE = unchecked((int)0x80004002); private bool _fSafeForScripting = true; private bool _fSafeForInitializing = true; public int GetInterfaceSafetyOptions(ref Guid riid, ref int pdwSupportedOptions, ref int pdwEnabledOptions) { int Rslt = E_FAIL; string strGUID = riid.ToString("B"); pdwSupportedOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER | INTERFACESAFE_FOR_UNTRUSTED_DATA; switch (strGUID) { case _IID_IDispatch: case _IID_IDispatchEx: Rslt = S_OK; pdwEnabledOptions = 0; if (_fSafeForScripting == true) pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_CALLER; break; case _IID_IPersistStorage: case _IID_IPersistStream: case _IID_IPersistPropertyBag: Rslt = S_OK; pdwEnabledOptions = 0; if (_fSafeForInitializing == true) pdwEnabledOptions = INTERFACESAFE_FOR_UNTRUSTED_DATA; break; default: Rslt = E_NOINTERFACE; break; } return Rslt; } public int SetInterfaceSafetyOptions(ref Guid riid, int dwOptionSetMask, int dwEnabledOptions) { int Rslt = E_FAIL; string strGUID = riid.ToString("B"); switch (strGUID) { case _IID_IDispatch: case _IID_IDispatchEx: if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_CALLER) && (_fSafeForScripting == true)) Rslt = S_OK; break; case _IID_IPersistStorage: case _IID_IPersistStream: case _IID_IPersistPropertyBag: if (((dwEnabledOptions & dwOptionSetMask) == INTERFACESAFE_FOR_UNTRUSTED_DATA) && (_fSafeForInitializing == true)) Rslt = S_OK; break; default: Rslt = E_NOINTERFACE; break; } return Rslt; } #endregion public UserControl1() { InitializeComponent(); // string test = Show(); // InputEnd = test; Show(); } static string aa = ""; public void Show() { serialPort1.PortName = "COM1"; serialPort1.BaudRate = 9600; serialPort1.Parity = 0; serialPort1.DataBits = 8; serialPort1.Open(); byte[] data = new byte[2]; data[0] = 0x1b; data[1] = 0x5d; serialPort1.Write(data, 0, 2); serialPort1.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(serialPort1_DataReceived); // return aa; } void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e) { try { Thread.Sleep(50);//保证足够的时间读取完整数据 int bytes = serialPort1.BytesToRead; // 创建字节数组 byte[] buffer = new byte[bytes]; // 读取缓冲区的数据到数组 serialPort1.Read(buffer, 0, bytes); string strbuffer = Encoding.ASCII.GetString(buffer);//将二进制转换成字符 string romovestartChar = strbuffer.Substring(2); string rightInfo = romovestartChar.Substring(0, romovestartChar.IndexOf('?')); // aa = rightInfo; //将括号里的值传到页面的文本框中 // MessageBox.Show(rightInfo); temphtml.execScript(functionstr + "('读取过来的参数')", "JScript"); if (serialPort1.IsOpen) { serialPort1.Close(); } } catch (Exception ex) { if (serialPort1.IsOpen) { serialPort1.Close(); } MessageBox.Show(ex.Message); } } //测试activex调用js是否成功 private void button1_Click(object sender, EventArgs e) { try { temphtml.execScript(functionstr + "('读取过来的参数')", "JScript"); } catch (Exception ex) { MessageBox.Show(ex.ToString()); } } private void button2_Click(object sender, EventArgs e) { foreach (SHDocVw.InternetExplorer iw in sws) { //iw.LocationName是IE窗口标题，也就是当前想更改的页面 <title> </title> 中的值 if (iw.LocationName == "我是title") { mshtml.HTMLDocument doc = (mshtml.HTMLDocument)iw.Document; //改变HTML控件中ID是b的值 // (doc.getElementById("b")).innerHTML = "ActiveX改变HTML里控件的值"; //调用HTML中的JS函数change(a) string a = "ActiveX调用JS函数"; mshtml.IHTMLWindow2 win = (mshtml.IHTMLWindow2)doc.parentWindow; win.execScript("show('" + a + "')", "JavaScript"); } } } } }
我想实现刷卡后立即就可以把卡号显示到页面的文本框中，我写了一个activex插件，用activex调用页面的js，完成赋值，现在的问题是用按钮测试了，可以把activex的值传到文本框中，可是触发刷卡事件后，在事件里写调用js的方法时候就提示指定的转换无效，同样都是事件，为什么按钮事件可以，刷卡事件就不行了呢，我测试了tempHtml不为空，就是调用方法的时候就提示错误，我把页面代码页粘过来
所有回答(2)
1
我也是碰到这样的问题 ，我后来发现“转换无效”是因为我在线程里面调用了js ,如果把它放到主线程（就像你的按钮）那样 就不会 了。
0
我也遇到同样的问题 请问是怎么解决的
