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Bit of C++ help, please?

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Maes
Advanced Cheater

Reputation: 10

Joined: 09 Apr 2009
Posts: 50

Posted: Wed Mar 09, 2011 12:30 pm Post subject: Bit of C++ help, please?

How might I use a button to display the current websites favicon, in a C++ browser. _________________ Account reclaimed by former owner?

AhMunRa
Grandmaster Cheater Supreme

Reputation: 27

Joined: 06 Aug 2010
Posts: 1117

Posted: Wed Mar 09, 2011 1:53 pm Post subject:

In C#

Code:

public static Image favicon(String u, string file)
{
Uri url = new Uri(u);
String iconurl = "http://" + url.Host + "/favicon.ico";

WebRequest request = WebRequest.Create(iconurl);
try
{
WebResponse response = request.GetResponse();

Stream s = response.GetResponseStream();
return Image.FromStream(s);
}
catch (Exception ex)
{
//return a default icon in case
//the web site doesn`t have a favicon
return Image.FromFile(file);
}
}

From http://www.codeproject.com/KB/cs/WBrowser.aspx

May give you an idea or two.
_________________

<Wiccaan> Bah that was supposed to say 'not saying its dead' lol. Fixing >.>

atom0s
Moderator

Reputation: 205

Joined: 25 Jan 2006
Posts: 8585
Location: 127.0.0.1

Posted: Wed Mar 09, 2011 3:46 pm Post subject:

This is an example of making an HTTP request to download the icon:

Code:

#pragma comment( lib, "WS2_32.lib" )
#include <WinSock2.h>
#include <Windows.h>
#include <iostream>
#include <string>

// Site to [attempt to] download icon from.
std::string g_vSite = "www.google.com";
std::string g_vIcon = "favicon.ico";

int main( int argc, TCHAR* argv[] )
{
WSADATA wsaData = { 0 };
if( WSAStartup( MAKEWORD( 2, 0 ), & wsaData ) != 0 )
{
   std::cout << "WSAStartup failed with error: " << WSAGetLastError() << std::endl;
   return 0;
}

SOCKET sock = { 0 };
if( ( sock = socket( PF_INET, SOCK_STREAM, IPPROTO_TCP ) ) < 0 )
{
   std::cout << "socket failed with error: " << WSAGetLastError() << std::endl;
   WSACleanup();
   return 0;
}

struct hostent* rhostent = { 0 };
rhostent = gethostbyname( g_vSite.c_str() );

struct sockaddr_in saddr = { 0 };
saddr.sin_family    = AF_INET;
saddr.sin_addr.s_addr = *(u_long*)rhostent->h_addr_list[0];
saddr.sin_port       = htons( 80 );

if( connect( sock, (struct sockaddr *)&saddr, sizeof( sockaddr_in ) ) < 0 )
{
   std::cout << "connect failed with error: " << WSAGetLastError() << std::endl;
   closesocket( sock );
   WSACleanup();
   return 0;
}

// Build HTTP GET request to obtain icon file.
std::string strHttpRequest = "GET /favicon.ico HTTP/1.0\r\n";
strHttpRequest += "Host: " + g_vSite + "\r\n";
strHttpRequest += "\r\n";

if( send( sock, strHttpRequest.c_str(), strHttpRequest.length(), 0 ) != strHttpRequest.length() )
{
   std::cout << "send failed with error: " << WSAGetLastError() << std::endl;
   closesocket( sock );
   WSACleanup();
   return 0;
}

// Retrieve buffer from request.
std::string strHttpResponse;
char szBuffer[ 512 ] = { 0 };
int nReadSize = 512;

while( nReadSize > 0 )
{
   nReadSize = recv( sock, (char*)&szBuffer, 512, NULL );
   if( nReadSize == 0 ) break;
   strHttpResponse += std::string( szBuffer ).substr( 0, nReadSize );
}

// Cleanup and return.
closesocket( sock );
WSACleanup();

return 0;
}

I wrote this in a few minutes so its prone to have issues (and no error checking). Used the following for references:

http://www.zedwood.com/article/113/cpp-winsock-basic-http-connection
http://msdn.microsoft.com/en-us/library/ms738524%28v=vs.85%29.aspx

You'll have to strip the response header from the response yourself, but that's one way to download the icon via Http. There are other download API that you can use to directly download the icon as well.
_________________

- Retired.

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