Reading text from webpage

**brietje698** · 10-09-2007

I'm trying to read text from a webpage but i don't know how...

something like

Code:

void main(){
         printf("%s", TextFromWebpage);
}

i'm trying to read it from http://www.something.com, so it schould output "Something".
Any help?

**matsp** · 10-09-2007

Ok, so what do you ACTUALLY want to do?

Say we have a HTML document on the file http://www.something.com/index.html that contains

Code:

<h1>Sometext</h1>\n<a href='http://www.something.com/blah.html'>Somelink</a>

, you want it to say

Code:

Sometext
Somelink

?

Or something else?

--
Mats

**brietje698** · 10-09-2007

Check out www.something.com...
i want it to exactly show "Something.".

**matsp** · 10-09-2007

And what it comes from is this

Code:

<html><head><title>Something.</title></head>
<body>Something.
</body>
</html>

To get "Something" extracted out of that, you will need to remove all the tagss in the angle brackets, and you should be left with the text "Something".

Of course, that is only half the problem, the other problem is to get the text from www.something.com to your application. You will need to either use an external program (such as wget) or write your own "download from the web" functions. The latter is not HARD to do, but not immediately trivial either.

--
Mats

**mikeman118** · 10-09-2007

Use DispHelper ( a library). Download it, and include the DispHelper.h file and the DispHelper.c file to your project. Then use the following code (this is straight from the examples section of the library):

Code:

int main(void)
{
	CDhInitialize init;
	dhToggleExceptions(TRUE);

	cout << "Running DownloadWebPage sample..." << endl;
	DownloadWebPage(TEXT("http://www.something.com"));
        cin.get();
        return 0;
}
void DownloadWebPage(LPCTSTR szURL)
{
	CDispPtr objHTTP;
	CDhStringA szResponse, szStatus;

	try
	{
		dhCheck( dhCreateObject(L"MSXML2.XMLHTTP", NULL, &objHTTP) );
		dhCheck( dhCallMethod(objHTTP, L".Open(%S, %T, %b)", L"GET", szURL, FALSE) );
		dhCheck( dhCallMethod(objHTTP, L".Send") );

		dhCheck( dhGetValue(L"%s", &szStatus, objHTTP, L".StatusText") );
		cout << "Status: " << szStatus << endl;

		dhCheck( dhGetValue(L"%s", &szResponse, objHTTP, L".ResponseText") );
		cout << szResponse << endl;
	}
	catch (string errstr)
	{
		cerr << "Fatal error details:" << endl << errstr << endl;
	}
}

**brietje698** · 10-10-2007

Originally Posted by mikeman118

Use DispHelper ( a library). Download it, and include the DispHelper.h file and the DispHelper.c file to your project. Then use the following code (this is straight from the examples section of the library):

Code:

int main(void)
{
	CDhInitialize init;
	dhToggleExceptions(TRUE);

	cout << "Running DownloadWebPage sample..." << endl;
	DownloadWebPage(TEXT("http://www.something.com"));
        cin.get();
        return 0;
}
void DownloadWebPage(LPCTSTR szURL)
{
	CDispPtr objHTTP;
	CDhStringA szResponse, szStatus;

	try
	{
		dhCheck( dhCreateObject(L"MSXML2.XMLHTTP", NULL, &objHTTP) );
		dhCheck( dhCallMethod(objHTTP, L".Open(%S, %T, %b)", L"GET", szURL, FALSE) );
		dhCheck( dhCallMethod(objHTTP, L".Send") );

		dhCheck( dhGetValue(L"%s", &szStatus, objHTTP, L".StatusText") );
		cout << "Status: " << szStatus << endl;

		dhCheck( dhGetValue(L"%s", &szResponse, objHTTP, L".ResponseText") );
		cout << szResponse << endl;
	}
	catch (string errstr)
	{
		cerr << "Fatal error details:" << endl << errstr << endl;
	}
}

It's giving me an error

**matsp** · 10-10-2007

And what error is that?

--
Mats

**zacs7** · 10-10-2007

I'd use libcurl and implement some sort of state-machine (to parse the HTML).

**brietje698** · 10-10-2007

Originally Posted by matsp

And what error is that?

--
Mats

Code:

Fatal error details:
Member: .Send
Function: CallMethod
Error In: InvokeArray
Error: Kan de opegeven bron niet vinden.
Code: 800c0005
Source: msxml3.dll

**matsp** · 10-10-2007

Code:

		dhCheck( dhCallMethod(objHTTP, L".Open(%S, %T, %b)", L"GET", szURL, FALSE) );
		dhCheck( dhCallMethod(objHTTP, L".Send") );

That would be one of the two lines above. How about a printout to figure out which of the two it is?

--
Mats

**mikeman118** · 10-10-2007

I can't help (I didn't write it, just used the given code). It worked for me, however. Remember to include DispHelper.c to your project.

**twomers** · 10-10-2007

This mightn't work (depending on what IDE you're using), but here's something I posted a while ago - http://cboard.cprogramming.com/showp...57&postcount=9
It's not a great solution really. As zac said - use libcurl - http://curl.haxx.se It's not hard to use.

My output:

Code:

Enter the URL: http://www.google.com
<html><head><meta http-equiv="content-type" content="text/html; charset=UTF-8"><title>Google</title><style>body,td,a,p,.
h{font-family:arial,sans-serif}.h{font-size:20px}.h{color:#3366cc}.q{color:#00c}.ts td{padding:0}.ts{border-collapse:col
lapse}</style><script>
<!--
window.google={kEI:"F5f-RqS6E464xAGH4aAc",kEXPI:"17259,17735",kHL:"nn"};function sf(){document.f.q.focus();}
window.clk=function(b,c,d,e,f,g){if(document.images){var a=encodeURIComponent||escape;(new Image).src="/url?sa=T"+(c?"&o
i="+a(c):"")+(d?"&cad="+a(d):"")+"&ct="+a(e)+"&cd="+a(f)+(b?"&url="+a(b.replace(/#.*/,"")).replace(/\+/g,"&#37;2B"):"")+"&ei
=F5f-RqS6E464xAGH4aAc"+g}return true};// -->
</script>
</head><body bgcolor=#ffffff text=#000000 link=#0000cc vlink=#551a8b alink=#ff0000 onload="sf();if(document.images){new
Image().src='/images/nav_logo3.png'}" topmargin=3 marginheight=3><div align=right id=guser style="font-size:84%;padding:
0 0 4px" width=100%><nobr><a href="https://www.google.com/accounts/Login?continue=http://www.google.com/&hl=nn">Logg p├&#209;
</a></nobr></div><center><br clear=all id=lgpd><img alt="Google" height=110 src="/intl/nn_ALL/images/logo.gif" width=334
><br><br><form action="/search" name=f><style>#lgpd{display:none}</style><script defer><!--
function qs(el){if(window.RegExp&&window.encodeURIComponent){var ue=el.href,qe=encodeURIComponent(document.f.q.value);if
(ue.indexOf("q=")!=-1){el.href=ue.replace(new RegExp("q=[^&$]*"),"q="+qe);}else{el.href=ue+"&q="+qe;}}return 1;}
//-->
</script><table border=0 cellspacing=0 cellpadding=4><tr><td nowrap><font size=-1><b>Veven</b>&nbsp;&nbsp;&nbsp;&nbsp;<a
 class=q href="http://images.google.com/imghp?oe=UTF-8&hl=nn&tab=wi" onclick="return qs(this)">Bilete</a>&nbsp;&nbsp;&nb
sp;&nbsp;<a class=q href="http://groups.google.com/grphp?oe=UTF-8&hl=nn&tab=wg" onclick="return qs(this)">Grupper</a>&nb
sp;&nbsp;&nbsp;&nbsp;<a class=q href="/dirhp?oe=UTF-8&hl=nn&tab=wd" onclick="return qs(this)">Katalog</a>&nbsp;&nbsp;&nb
sp;&nbsp;<!--"/*"/*--><font size=-1><a class=q onClick='return window.qs?qs(this):1' href='http://127.0.0.1:4664/&s=OyHX
5sj3H8T6QlFLBCw2ZKLLBP0'>Desktop</a></font>&nbsp;&nbsp;&nbsp;&nbsp;</font></td></tr></table><table cellpadding=0 cellspa
cing=0><tr valign=top><td width=25%>&nbsp;</td><td align=center nowrap><input name=hl type=hidden value=nn><input maxlen
gth=2048 name=q size=55 title="Google-s├╕k" value=""><br><input name=btnG type=submit value="Google-s├╕k"><input name=bt
nI type=submit value="Beint fram!"></td><td nowrap width=25%><font size=-2>&nbsp;&nbsp;<a href=/advanced_search?hl=nn>Ut
vida s├╕k</a><br>&nbsp;&nbsp;<a href=/preferences?hl=nn>Innstillingar</a><br>&nbsp;&nbsp;<a href=/language_tools?hl=nn>S
pr├&#209;kverkty</a></font></td></tr></table></form><br><br><font size=-1><a href="/intl/no/about.html">Alt om  Google</a> -
<b><a href=http://www.google.ie/>G├&#209; til Google Ireland</a></b><span id=hp style="behavior:url(#default#homepage)"></spa
n><script><!--
(function() {var a="http://www.google.com/",b=document.getElementById("hp"),c=b.isHomePage(a);_rptHp=function(){(new Ima
ge).src="/gen_204?sa=X&ct=mgyhp&cd="+(b.isHomepage(a)?1:0)};if(!c){document.write('<p><a href=/mgyhp.html onClick=docume
nt.getElementById("hp").setHomepage("'+a+'");_rptHp();>Gjer Google til startsida di!</a>')};})();//-->
</script></font><p><font size=-2>&copy;2007 Google</font></p></center></body></html>

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