comparison oscpack/ip/win32/NetworkingUtils.cpp @ 76:0ae87af84e2f

added oscgroups

+/*
+	oscpack -- Open Sound Control (OSC) packet manipulation library
+    http://www.rossbencina.com/code/oscpack
+
+    Copyright (c) 2004-2013 Ross Bencina <[e-mail]>
+
+	Permission is hereby granted, free of charge, to any person obtaining
+	a copy of this software and associated documentation files
+	(the "Software"), to deal in the Software without restriction,
+	including without limitation the rights to use, copy, modify, merge,
+	publish, distribute, sublicense, and/or sell copies of the Software,
+	and to permit persons to whom the Software is furnished to do so,
+	subject to the following conditions:
+
+	The above copyright notice and this permission notice shall be
+	included in all copies or substantial portions of the Software.
+
+	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+	EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+	MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+	IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
+	ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+	CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+	WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+
+/*
+	The text above constitutes the entire oscpack license; however, 
+	the oscpack developer(s) also make the following non-binding requests:
+
+	Any person wishing to distribute modifications to the Software is
+	requested to send the modifications to the original developer so that
+	they can be incorporated into the canonical version. It is also 
+	requested that these non-binding requests be included whenever the
+	above license is reproduced.
+*/
+#include "ip/NetworkingUtils.h"
+
+#include <winsock2.h>   // this must come first to prevent errors with MSVC7
+#include <windows.h>
+
+#include <cstring>
+
+
+static LONG initCount_ = 0;
+static bool winsockInitialized_ = false;
+
+NetworkInitializer::NetworkInitializer()
+{
+    if( InterlockedIncrement( &initCount_ ) == 1 ){
+        // there is a race condition here if one thread tries to access
+        // the library while another is still initializing it. 
+        // i can't think of an easy way to fix it so i'm telling you here
+        // incase you need to init the library from two threads at once.
+        // this is why the header file advises to instantiate one of these 
+        // in main() so that the initialization happens globally
+
+        // initialize winsock
+	    WSAData wsaData;
+	    int nCode = WSAStartup(MAKEWORD(1, 1), &wsaData);
+	    if( nCode != 0 ){
+	        //std::cout << "WSAStartup() failed with error code " << nCode << "\n";
+        }else{
+            winsockInitialized_ = true;
+        }
+    }
+}
+
+
+NetworkInitializer::~NetworkInitializer()
+{
+    if( InterlockedDecrement( &initCount_ ) == 0 ){
+        if( winsockInitialized_ ){
+            WSACleanup();
+            winsockInitialized_ = false;
+        }
+    }
+}
+
+
+unsigned long GetHostByName( const char *name )
+{
+    NetworkInitializer networkInitializer;
+
+    unsigned long result = 0;
+
+    struct hostent *h = gethostbyname( name );
+    if( h ){
+        struct in_addr a;
+        std::memcpy( &a, h->h_addr_list[0], h->h_length );
+        result = ntohl(a.s_addr);
+    }
+
+    return result;
+}