NSIS：判断并安装.NET Framework 4 的实例

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现在.NET开发的软件已经大行其道，但有些操作系统并不符合软件的运行要求，所以，我们需要在安装程序中进行.NET Framework的判断，如果不符合要求就进行静默安装。

首先，我们在Function区段进行当前.NET版本判断：

1. Function GetNetFrameworkVersion
   
2. ;获取.Net Framework版本支持
   
3. Push $1
   
4. Push $0
   
5. ReadRegDWORD $0 HKLM "SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full" "Install"
   
6. ReadRegDWORD $1 HKLM "SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full" "Version"
   
7. StrCmp $0 1 KnowNetFrameworkVersion +1
   
8. ReadRegDWORD $0 HKLM "SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5" "Install"
   
9. ReadRegDWORD $1 HKLM "SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.5" "Version"
   
10. StrCmp $0 1 KnowNetFrameworkVersion +1
    
11. ReadRegDWORD $0 HKLM "SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.0\Setup" "InstallSuccess"
    
12. ReadRegDWORD $1 HKLM "SOFTWARE\Microsoft\NET Framework Setup\NDP\v3.0\Setup" "Version"
    
13. StrCmp $0 1 KnowNetFrameworkVersion +1
    
14. ReadRegDWORD $0 HKLM "SOFTWARE\Microsoft\NET Framework Setup\NDP\v2.0.50727" "Install"
    
15. ReadRegDWORD $1 HKLM "SOFTWARE\Microsoft\NET Framework Setup\NDP\v2.0.50727" "Version"
    
16. StrCmp $1 "" +1 +2
    
17. StrCpy $1 "2.0.50727.832"
    
18. StrCmp $0 1 KnowNetFrameworkVersion +1
    
19. ReadRegDWORD $0 HKLM "SOFTWARE\Microsoft\NET Framework Setup\NDP\v1.1.4322" "Install"
    
20. ReadRegDWORD $1 HKLM "SOFTWARE\Microsoft\NET Framework Setup\NDP\v1.1.4322" "Version"
    
21. StrCmp $1 "" +1 +2
    
22. StrCpy $1 "1.1.4322.573"
    
23. StrCmp $0 1 KnowNetFrameworkVersion +1
    
24. ReadRegDWORD $0 HKLM "SOFTWARE\Microsoft\.NETFramework\policy\v1.0" "Install"
    
25. ReadRegDWORD $1 HKLM "SOFTWARE\Microsoft\.NETFramework\policy\v1.0" "Version"
    
26. StrCmp $1 "" +1 +2
    
27. StrCpy $1 "1.0.3705.0"
    
28. StrCmp $0 1 KnowNetFrameworkVersion +1
    
29. StrCpy $1 "not .NetFramework"
    
30. KnowNetFrameworkVersion:
    
31. Pop $0
    
32. Exch $1
    
33. FunctionEnd

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然后，在Section区段进行.NET静默安装：

1. Section -.NET
   
2. Call GetNetFrameworkVersion
   
3. Pop $R1
   
4. ${If} $R1 < '4.0.30319'
   
5. SetDetailsPrint textonly
   
6. DetailPrint "正在安装 .NET Framework 4"
   
7. SetDetailsPrint listonly
   
8. 
   
9. SetOutPath "$TEMP"
   
10. SetOverwrite on
    
11. File "dotNetFx40_Full_x86_x64.exe"
    
12. ExecWait '$TEMP\dotNetFx40_Full_x86_x64.exe /q /norestart /ChainingPackage FullX64Bootstrapper' $R1
    
13. Delete "$TEMP\dotNetFx40_Full_x86_x64.exe"
    
14. ${EndIf}
    
15. SectionEnd

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当然，在Section区段可以做到自动在线下载而不把.NET打到安装包中，这样可以减小安装包体积。