OpenEuphoria

1. DLL question

• Posted by Hallvard Ystad <euphoria at babelserver.org> Jul 08, 2006
• 682 views
• Last edited Jul 09, 2006

Hello folks,

I found the URL Moniker wrapper in the archive and wonder how to download a URL,
not to a file, but to a string.

I looked at the urlmon.dll file and found what looks to me like several method
names indicating it should be possible, but I know too little about this dll.

Does anyone know how to accomplish it?

Thanks,
HY

3. Re: DLL question

• Posted by don cole <doncole at pacbell.net> Jul 09, 2006
• 663 views

Hallvard Ystad wrote:
> 
> Hello folks,
> 
> I found the URL Moniker wrapper in the archive and wonder how to download a
> URL, not to a file, but to a string.
> 
> I looked at the urlmon.dll file and found what looks to me like several method
> names indicating it should be possible, but I know too little about this dll.
> 
> Does anyone know how to accomplish it?
> 
> Thanks,
> HY

Hello HY,

This is what I use:

include urlmon.ew
--
 atom lastTime,lastProgress
function OnProgress(atom progress,atom progressMax,atom status,atom statusText)
	atom t,dt,speed
	if status=URLMON_BEGINDOWNLOADDATA then
		puts(1,"Starting download\n")
	elsif status=URLMON_ENDDOWNLOADDATA then
		puts(1,"\n\nDownload finished!*\n")
	elsif status=URLMON_DOWNLOADINGDATA then
		t = time()
		dt = t-lastTime
		if dt=0 then dt=0.001 end if
		speed = (progress-lastProgress)/dt
		if speed=0 then speed=0.001 end if
		lastTime = t
		lastProgress = progress
		position(5,1)
		printf(1,"%d of %d kB done at %1.2f kB/s. %d seconds remaining        ",
			floor({progress,progressMax,speed,(progressMax-progress)/speed}/1024))
		puts(1,"\nPress [ESC] to abort download")
	elsif status=URLMON_CONNECTING then
		puts(1,"Connecting to host..\n")
	elsif status=URLMON_SENDINGREQUEST then
		puts(1,"Requesting file..\n")
	end if
	if get_key()=27 then
		puts(1,"\n\nDownload aborted!\n")
--pause()
		return URLMON_ABORT
	end if
	return 0
end function

------------------------------start of program-------------------------
-------------------------download----------------------------
global procedure download(sequence webpage,sequence asp_loc)
  atom result,fn3
puts(1,"Starting Program...\n")
  fn3=open(asp_loc,"w")
?fn3

  close (fn3)
lastTime = time()
lastProgress = 0
   result =  URLDownloadToFile(webpage, 
		   asp_loc,
	        call_back(routine_id("OnProgress")),
		   0)
if result then
	puts(1,"Download failed!*\n")
?result
--pause()
end if
for x= 1 to 10 do
?x
end for
end procedure

Don Cole

5. Re: DLL question

• Posted by Hallvard Ystad <euphoria at babelserver.org> Jul 09, 2006
• 648 views

Second thought:
http://msdn.microsoft.com/workshop/networking/moniker/monikers.asp
doesn't seem to tell that the DLL knows how to give the contents of a URL to a
string, so maybe I'm mistaken. The method names that I saw inside the DLL are not
mentioned on that site...

Still hoping, though,
HY

Hallvard Ystad wrote:
> 
> Thanks C Bouzy and Don Cole, but
> 
> 1) I need *synchronous* http (need to fetch certain data via http when in a
> CGI script), and
> 2) I want the data in a string, not written to a file (because I don't want
> to reread the contents from the disk)
> 
> I *think* this is possible with the urlmon.dll. There seems to be methods in
> it with names like URLDownloadW and URLDownloadA. I just don't know how to
> wrap
> them in euphoria.
> 
> Thanks in advance,
> HY
> Prætera censeo Carthaginem esse delendam

7. Re: DLL question

• Posted by Hallvard Ystad <euphoria at babelserver.org> Jul 10, 2006
• 683 views

don cole wrote:
> Hello HY,
> The way access the code I sent you is:
>  download("Http://www.mywebsite.html","c:\\download.asp")
>   This will download the webpage and save it as an .asp file (which is a .txt
> file.

I know. The thing is, I don't want to write this to a file on the local disk and
then reread it into a string. Why do two disk operations when I can do none?

Unfortunately, I know too little about native windows programming and euphoria
dll wrapping. Have been trying to figure out some of it, but didn't seem to get
the right results.

According to 
http://msdn.microsoft.com/workshop/networking/moniker/reference/functions/urlmon_ref_functions_entry.asp
the URLOpenStream function creates a push type stream object from a URL. Could
this stream be turned into a euphoria sequence (string)? Are there any volunteers
to wrap this function for me? The original URL Moniker DLL wrapper in euphoria is
here: http://www.rapideuphoria.com/urlmon.zip.

If there are no volunteers, I won't bother the list with this anymore.

Thanks,
HY

9. Re: DLL question

• Posted by don cole <doncole at pacbell.net> Jul 11, 2006
• 702 views

Hallvard Ystad wrote:
> 

> I know. The thing is, I don't want to write this to a file on the local disk
> and then reread it into a string. Why do two disk operations when I can do
> none?
> 



I hope you mean "when I can do one".

I'd like to see a sample of this webpage you are trying to get text from.


Don Cole

11. Re: DLL question

• Posted by don cole <doncole at pacbell.net> Jul 12, 2006
• 709 views

Hallvard Ystad wrote:
> 
> C Bouzy wrote:
> > That is why I sent you to the link to Asynchronous HTTP by Thomas Parslow,
> > it does exactly what you want. 
> 
> ..except that I don't wish to use async http, because my requests are done
> from
> within a CGI script. Once I start waiting for an async http port, my cgi
> script
> finishes and dies before I get the response. I prefer waiting for synchronous
> http rather than sleep() or have a while loop waiting for a boolean value to
> be true. I want my CGI script to move straightforward from start to end.
> 
> 
> don cole wrote:
> > I hope you mean "when I can do one".
> 
> Do I have to? Does retrieving content from a web server necessarily involve
> disk activity? I have to open a port, sure, but I don't have to mess with my
> disk drive, do I?
> 

No, if all you want to do is open your browser and read the text of the webpage
there woulld be no need of disk activity. Except of course the opening and
closing of the browser. Now for that, you wouldn't need any euphoria programing
at all just a browser.

I was under the impression that you wanted to clip some text and save it for
later use.

> > I'd like to see a sample of this webpage you are trying to get text from.
> 
> It could be anything, really. It could be <a
> href="http://www.rapideuphoria.com/">http://www.rapideuphoria.com/</a>.
> The CGI script reads (will read, hopefully) the webpage into a string and
> rewrite some of
> it to be displayed in the client browser. E.g. I could extract whatever is
> within the <title>
> tags.
> 
> Thanks for peeking into this, anyway.
> HY
> 
> Prætera censeo Carthaginem esse delendam


Don Cole