Question

我想通过transcrypt代码获取文件。通常这是通过XMLHttpRequest完成的。在Javascript脚本中，新构造函数用于此目的。我如何进行transcrypt呢？这是我无法使用的代码：

#!/usr/bin/env python
# -*- coding: utf-8 -*-

def read_file():
    xmlhttp=XMLHttpRequest()
    xmlhttp.open('GET', "https://raw.githubusercontent.com/bunkahle/Transcrypt-Examples/master/README.md", False);
    xmlhttp.send()
    console.log(xmlhttp.responseText)

和html：

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <script src="__javascript__/read_file.js"></script>
    <title>Read File</title>
  </head>
  <body>
    <main>
        <h1>Read a file!</h1>
        <p id="p1" class="para1">Read a file!</p>
      <button id="button1" onclick="read_file.read_file()">Click for retrieving text file</button><br><br>
      <p id="demo"></p>
    </main>
  </body>
</html>

Answer 1

您可以使用(e.Data as System.Windows.DataObject).GetFormats(false); {string[4]} [0]: "DragContext" [1]: "DragImageBits" [2]: "chromium/x-renderer-taint" [3]: "FileDrop" (e.Data as System.Windows.DataObject).GetData("DragContext"); '(e.Data as System.Windows.DataObject).GetData("DragContext")' threw an exception of type 'System.Runtime.InteropServices.COMException' Data: {System.Collections.ListDictionaryInternal} ErrorCode: -2147221404 HResult: -2147221404 HelpLink: null InnerException: null Message: "Invalid FORMATETC structure (Exception from HRESULT: 0x80040064 (DV_E_FORMATETC))" Source: "System" StackTrace: " at System.Runtime.InteropServices.ComTypes.IDataObject.GetData(FORMATETC& format, STGMEDIUM& medium)\r\n at System.Windows.DataObject.OleConverter.GetDataInner(FORMATETC& formatetc, STGMEDIUM& medium)\r\n at System.Windows.DataObject.OleConverter.GetDataFromOleHGLOBAL(String format, DVASPECT aspect, Int32 index)\r\n at System.Windows.DataObject.OleConverter.GetDataFromBoundOleDataObject(String format, DVASPECT aspect, Int32 index)\r\n at System.Windows.DataObject.OleConverter.GetData(String format, Boolean autoConvert, DVASPECT aspect, Int32 index)\r\n at System.Windows.DataObject.OleConverter.GetData(String format, Boolean autoConvert)\r\n at System.Windows.DataObject.GetData(String format, Boolean autoConvert)\r\n at System.Windows.DataObject.GetData(String format)" TargetSite: {Void GetData(System.Runtime.InteropServices.ComTypes.FORMATETC ByRef, System.Runtime.InteropServices.ComTypes.STGMEDIUM ByRef)} (e.Data as System.Windows.DataObject).GetData("DragImageBits"); {System.IO.MemoryStream} CanRead: true CanSeek: true CanTimeout: false CanWrite: true Capacity: 87144 Length: 87144 Position: 0 ReadTimeout: '((System.IO.Stream)(e.Data as System.Windows.DataObject).GetData("DragImageBits")).ReadTimeout' threw an exception of type 'System.InvalidOperationException' WriteTimeout: '((System.IO.Stream)(e.Data as System.Windows.DataObject).GetData("DragImageBits")).WriteTimeout' threw an exception of type 'System.InvalidOperationException' (e.Data as System.Windows.DataObject).GetData("chromium/x-renderer-taint"); {System.IO.MemoryStream} CanRead: true CanSeek: true CanTimeout: false CanWrite: true Capacity: 1 Length: 1 Position: 0 ReadTimeout: '((System.IO.Stream)(e.Data as System.Windows.DataObject).GetData("chromium/x-renderer-taint")).ReadTimeout' threw an exception of type 'System.InvalidOperationException' WriteTimeout: '((System.IO.Stream)(e.Data as System.Windows.DataObject).GetData("chromium/x-renderer-taint")).WriteTimeout' threw an exception of type 'System.InvalidOperationException' (e.Data as System.Windows.DataObject).GetData("FileDrop"); '(e.Data as System.Windows.DataObject).GetData("FileDrop")' threw an exception of type 'System.Runtime.InteropServices.COMException' Data: {System.Collections.ListDictionaryInternal} ErrorCode: -2147221404 HResult: -2147221404 HelpLink: null InnerException: null Message: "Invalid FORMATETC structure (Exception from HRESULT: 0x80040064 (DV_E_FORMATETC))" Source: "System" StackTrace: " at System.Runtime.InteropServices.ComTypes.IDataObject.GetData(FORMATETC& format, STGMEDIUM& medium)\r\n at System.Windows.DataObject.OleConverter.GetDataInner(FORMATETC& formatetc, STGMEDIUM& medium)\r\n at System.Windows.DataObject.OleConverter.GetDataFromOleHGLOBAL(String format, DVASPECT aspect, Int32 index)\r\n at System.Windows.DataObject.OleConverter.GetDataFromBoundOleDataObject(String format, DVASPECT aspect, Int32 index)\r\n at System.Windows.DataObject.OleConverter.GetData(String format, Boolean autoConvert, DVASPECT aspect, Int32 index)\r\n at System.Windows.DataObject.OleConverter.GetData(String format, Boolean autoConvert)\r\n at System.Windows.DataObject.GetData(String format, Boolean autoConvert)\r\n at System.Windows.DataObject.GetData(String format)" TargetSite: {Void GetData(System.Runtime.InteropServices.ComTypes.FORMATETC ByRef, System.Runtime.InteropServices.ComTypes.STGMEDIUM ByRef)}函数创建本机JavaScript对象：

（注意，对于实例化Python / Transcrypt类，不需要这样做）

__new__

有关这方面的更多信息，请访问：

http://www.transcrypt.org/docs/html/special_facilities.html#creating-javascript-objects-with-new-constructor-call

transcrypt的新构造函数？

1 个答案: