初始化版本

lwip/lwip-2.2.1/contrib/ports/win32/readme.txt

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+lwIP for Win32
+
+This is an example port of lwIP for Win32. It uses WinPCAP to send & receive packets.
+To compile it, use the MSVC projects in the 'msvc' subdir, the CMake files, or the Makefile
+in the 'mingw' subdir.
+
+For all compilers/build systems:
+- you have to set an environment variable PCAP_DIR pointing to the WinPcap Developer's
+  Pack (containing 'include' and 'lib')
+  alternatively, place the WinPcap Developer's pack next to the "lwip" folder:
+  "winpcap\WpdPack"
+
+You also will have to copy the file 'contrib/examples/example_app/lwipcfg.h.example' to
+'contrib/examples/example_app/lwipcfg.h' and modify to suit your needs (WinPcap adapter number,
+IP configuration, applications...).
+
+Included in the contrib\ports\win32 directory is the network interface driver
+using the winpcap library.
+
+lwIP: http://savannah.nongnu.org/projects/lwip/
+WinPCap: https://www.winpcap.org/devel.htm
+Visual C++: http://www.microsoft.com/express/download/
+
+To compile the unittests (msvc\lwIP_unittests.sln), download check (tested with v0.11.0) from
+https://github.com/libcheck/check/releases/
+and place it in a folder "check" next to the "contrib" folder.