C/Side & Automation server Microsoft WinHTTP Services

bhalpin

Hi.

I'm experimenting with the Automation class 'Microsoft WinHTTP Services, version 5.1'.WinHttpRequest'. It looks to me like I can use this to reach out and grab web content.

So far though, I haven't come up with much. The following code is my 'hacking-to-date':

Vars:
   WinHTTPRequest 
     Type: Automation 
     Automation server: Microsoft WinHTTP Services, version 5.1
     Class: WinHttpRequest
   RText
     Type: BigText

CREATE(WinHTTPRequest);
WinHTTPRequest.Open('GET','http://www.mibuso.com',FALSE);
WinHTTPRequest.Send;
IF WinHTTPRequest.
WaitForResponse(5000) THEN BEGIN
  CLEAR(RText);
  RText.ADDTEXT(WinHTTPRequest.ResponseBody());
  MESSAGE(FORMAT(RText));
END ELSE
  MESSAGE('No Response');

When I run this, I get three odd characters in the MESSAGE window.

If I change the code to use a plain Text variable to store the respone in, I get the error "This data type is not supported by C/Side."

I'm having fun - but not getting very far.

Has anyone used this automation server (and can maybe point out where I'm being a total idiot), or know of any working examples anywhere?

Thanks in advance.

Bob

rvduuren

Hello,

What is it you are trying to achieve with WinHTTP, download content? Check -> Download content with NAV.

bhalpin

Hi.

Thank's for that link - that look exactly like what I'm after.

The background is I want to download currency echange rate information from a given URL. I started a thread about this earlier and reciived an excellent link to the download section for an XML-based solution.

I'll probably go with this idea though - it's simpler and required fewer objects.

Bob

garak

To download an XML file from a website you can do this for example with this:

Name	DataType	Subtype	Length
URL	Text		250
XMLHTTP	Automation	'Microsoft XML, v4.0'.XMLHTTP40	
XMLDoc	Automation	'Microsoft XML, v4.0'.DOMDocument40	

----------------------------
OnPush()
Name	DataType	Subtype	Length
XMLFile	File		
XMLPort	XMLport	YourDesignedXMLPort
Stream	InStream		


DownloadXMLFile(Filename);
IF XMLFile.OPEN(Filename) THEN BEGIN
  XMLFile.CREATEINSTREAM(Stream);
  XMLPort.SETSOURCE(Stream);
  IF NOT XMLPort.IMPORT THEN
    error('Could not import the file :-( ');
end else error('No file to open');
-----------------------------

DownloadXMLFile(VAR Filename : Text[30])
IF ISCLEAR(XMLHTTP) THEN
  IF NOT CREATE(XMLHTTP) THEN
    ERROR(Text000);

URL:= HEREYOURURLTOTHEXML;

XMLHTTP.open('GET',URL,FALSE);
XMLHTTP.send();

IF (XMLHTTP.status = 200) THEN BEGIN
  IF ISCLEAR(XMLDoc) THEN
    IF NOT CREATE(XMLDoc) THEN
      ERROR(Text000);

  XMLDoc.async:=FALSE;
  XMLDoc.load(XMLHTTP.responseBody);

  IF RemoveNamespace(XMLDoc,XMLDoc) THEN BEGIN
    Filename´:= ENVIRON('TEMP') + '\' + 'Filename.xml';

    XMLDoc.save(Filename);
  END;

  CLEAR(XMLDoc);
END ELSE
    ERROR('Can't find URL');

CLEAR(XMLHTTP);

-----------------------

RemoveNamespace(XMLSourceDocument : Automation "'Microsoft XML, v4.0'.DOMDocument40";VAR XMLDestinationDocument : Automation "'Microsof
Name	DataType	Subtype	Length
TempTable	Record	Item	
OutStreamStylesheet	OutStream		
InStreamStylesheet	InStream		
XMLStyleSheet	Automation	'Microsoft XML, v4.0'.DOMDocument40	

//here we remove not needed Namespaces

TempTable.Picture.CREATEOUTSTREAM(OutStreamStylesheet);
TempTable.Picture.CREATEINSTREAM(InStreamStylesheet);

WITH OutStreamStylesheet DO BEGIN
  WRITETEXT('<?xml version="1.0" encoding="UTF-8"?>');
  WRITETEXT('<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">');
  WRITETEXT('<xsl:output method="xml" encoding="UTF-8" />');
  WRITETEXT('<xsl:template match="/">');
  WRITETEXT('<xsl:copy>');
  WRITETEXT('<xsl:apply-templates />');
  WRITETEXT('</xsl:copy>');
  WRITETEXT('</xsl:template>');
  WRITETEXT('<xsl:template match="*">');
  WRITETEXT('<xsl:element name="{local-name()}">');
  WRITETEXT('<xsl:apply-templates select="@* | node()" />');
  WRITETEXT('</xsl:element>');
  WRITETEXT('</xsl:template>');
  WRITETEXT('<xsl:template match="@*">');
  WRITETEXT('<xsl:attribute name="{local-name()}"><xsl:value-of select="."/></xsl:attribute>');
  WRITETEXT('</xsl:template>');
  WRITETEXT('<xsl:template match="text() | processing-instruction() | comment()">');
  WRITETEXT('<xsl:copy />');
  WRITETEXT('</xsl:template>');
  WRITETEXT('</xsl:stylesheet>');
END;

IF ISCLEAR(XMLStyleSheet) THEN
  IF NOT CREATE(XMLStyleSheet) THEN
    EXIT(FALSE);

IF NOT XMLStyleSheet.load(InStreamStylesheet) THEN
  EXIT(FALSE);

IF ISCLEAR(XMLDestinationDocument) THEN
  IF NOT CREATE(XMLDestinationDocument) THEN
    EXIT(FALSE);

XMLSourceDocument.transformNodeToObject(XMLStyleSheet,XMLDestinationDocument);

EXIT(TRUE);
---------------------

So with this little example you can download a XML file from a specific url and import this file with a XMLPort (also you can use the XMLDom)

Regards

bhalpin

Yikes! Never ask a question here unless you're ready to accept *LOTS* of help!

This is all great stuff people - thanks!

I was just reading the article at the link below the previous post here came in. This looks really good:

http://blogs.msdn.com/nav_developer/archive/2008/03/31/sample-of-how-to-read-a-simple-xml-document-using-msxml-dom-in-nav.aspx

Bob