Add a method to detect the presence of the .NET Framework

src/Setup/FxHelper.cpp

@@ -0,0 +1,27 @@
+#include "stdafx.h"
+#include "FxHelper.h"
+
+CFxHelper::CFxHelper() { }
+CFxHelper::~CFxHelper() { }
+
+// http://msdn.microsoft.com/en-us/library/hh925568(v=vs.110).aspx#net_b
+const wchar_t* ndpPath = L"SOFTWARE\\Microsoft\\NET Framework Setup\\NDP\\v4\\Full";
+const int fx45ReleaseVersion = 378389;
+
+bool CFxHelper::IsDotNet45OrHigherInstalled(void)
+{
+	ATL::CRegKey key;
+
+	if (key.Open(HKEY_LOCAL_MACHINE, ndpPath, KEY_READ) != ERROR_SUCCESS) {
+		DWORD dwErr = GetLastError();
+		return false;
+	}
+
+	DWORD dwReleaseInfo = 0;
+	if (key.QueryDWORDValue(L"Release", dwReleaseInfo) != ERROR_SUCCESS ||
+		dwReleaseInfo < fx45ReleaseVersion) {
+		return false;
+	}
+
+	return true;
+}

src/Setup/FxHelper.h

@@ -0,0 +1,8 @@
+#pragma once
+class CFxHelper
+{
+public:
+	CFxHelper();
+	~CFxHelper();
+	static bool IsDotNet45OrHigherInstalled(void);
+};

src/Setup/Setup.vcxproj

@@ -86,12 +86,14 @@
     </Link>
   </ItemDefinitionGroup>
   <ItemGroup>
+    <ClInclude Include="FxHelper.h" />
     <ClInclude Include="Resource.h" />
     <ClInclude Include="Setup.h" />
     <ClInclude Include="stdafx.h" />
     <ClInclude Include="targetver.h" />
   </ItemGroup>
   <ItemGroup>
+    <ClCompile Include="FxHelper.cpp" />
     <ClCompile Include="winmain.cpp" />
     <ClCompile Include="stdafx.cpp">
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">Create</PrecompiledHeader>

src/Setup/stdafx.h

@@ -20,7 +20,7 @@
 
 #include <atlbase.h>
 #include <atlapp.h>
-
+#include <atldlgs.h>
 #include <atlwin.h>
 
 #if defined _M_IX86