dev. » win32 http://coliena.com/blog some software engineers' random rants and thoughts Mon, 30 Aug 2010 20:02:16 +0000 en hourly 1 http://wordpress.org/?v=3.0.1 Fighting Windows Sockets Legacy Troubles http://coliena.com/blog/2010/05/winsock-troubles/ http://coliena.com/blog/2010/05/winsock-troubles/#comments Fri, 14 May 2010 19:00:31 +0000 niels http://coliena.com/blog/?p=290 I came across a really annoying problem while using win32 sockets one of my bigger projects. In short, the VisualC compiler complained about redefinitions of basic Windows socket macros:

C:\sdk\windows\v6.0a\include\ws2def.h(91) : warning C4005: 'AF_IPX' : macro redefinition
C:\sdk\windows\v6.0a\include\winsock.h(460) : see previous definition of 'AF_IPX'
C:\sdk\windows\v6.0a\include\ws2def.h(124) : warning C4005: 'AF_MAX' : macro redefinition
C:\sdk\windows\v6.0a\include\winsock.h(479) : see previous definition of 'AF_MAX'
C:\sdk\windows\v6.0a\include\ws2def.h(163) : warning C4005: 'SO_DONTLINGER' : macro redefinition
C:\sdk\windows\v6.0a\include\winsock.h(402) : see previous definition of 'SO_DONTLINGER'
C:\sdk\windows\v6.0a\include\ws2def.h(206) : error C2011: 'sockaddr' : 'struct' type redefinition
C:\sdk\windows\v6.0a\include\winsock.h(485) : see declaration of 'sockaddr'
C:\sdk\windows\v6.0a\include\ws2def.h(384) : error C2143: syntax error : missing '}' before 'constant'
C:\sdk\windows\v6.0a\include\ws2def.h(384) : error C2143: syntax error : missing ';' before 'constant'
C:\sdk\windows\v6.0a\include\ws2def.h(384) : error C2059: syntax error : 'constant'
C:\sdk\windows\v6.0a\include\ws2def.h(437) : error C2143: syntax error : missing ';' before '}
(...)


After some digging in the code I noticed that windows.h had been included before winsock2.h. And that windows.h includes winsock.h. When digging deeper, I found an article in the MSDN describing what had happened here:
actually, this is a legacy problem. In Windows versions <= Windows 98, WinSock 1.1 had been used. The current win32 socket implementation, Windows Sockets 2 (WinSock 2.0), is backwards compatible to Windows Sockets 1.1. Additionally, the winsock2.h header files prevents the inclusion of the legacy winsock.h header file. But once you include winsock.h, you can not include winsock2.h later on.
Unfortunately, windows.h still includes winsock.h.
Fortunately, you can disable the legacy parts of the Windows SDK easily:

#define WIN32_LEAN_AND_MEAN

You will not be able to build Windows 95/Windows 98 applications when using this definition. But if you were targeting those OS versions, you wouldn’t be using Windows Sockets 2 anyway.

]]> http://coliena.com/blog/2010/05/winsock-troubles/feed/ 0 Sending win32 Messages to Windows Applications http://coliena.com/blog/2010/03/sending-win32-messages-to-windows-applications/ http://coliena.com/blog/2010/03/sending-win32-messages-to-windows-applications/#comments Wed, 03 Mar 2010 18:43:53 +0000 niels http://coliena.com/blog/?p=253 TortoiseSVN itself is a very cool tool. And it’s developers have created a nice collection of very helpful utilities as well.
So, if you ever need to send a single win32 message to a running application, you might try SendMessage.
Small size, works as advertised, free. :)

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