NSIS：判断并安装.NET Framework 4 的例子

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：

    Function GetNetFrameworkVersion
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;获取.Net Framework版本支持
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Push $1
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Push $0
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ReadRegDWORD $0 HKLM "SOFTWAREMicrosoftNET Framework SetupNDPv4Full""Install"
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ReadRegDWORD $1 HKLM "SOFTWAREMicrosoftNET Framework SetupNDPv4Full""Version"
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StrCmp $0 1 KnowNetFrameworkVersion +1
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ReadRegDWORD $0 HKLM "SOFTWAREMicrosoftNET Framework SetupNDPv3.5""Install"
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ReadRegDWORD $1 HKLM "SOFTWAREMicrosoftNET Framework SetupNDPv3.5""Version"
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StrCmp $0 1 KnowNetFrameworkVersion +1
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ReadRegDWORD $0 HKLM "SOFTWAREMicrosoftNET Framework SetupNDPv3.0Setup" "InstallSuccess"
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ReadRegDWORD $1 HKLM "SOFTWAREMicrosoftNET Framework SetupNDPv3.0Setup" "Version"
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StrCmp $0 1 KnowNetFrameworkVersion +1
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ReadRegDWORD $0 HKLM "SOFTWAREMicrosoftNET Framework SetupNDPv2.0.50727" "Install"
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ReadRegDWORD $1 HKLM "SOFTWAREMicrosoftNET Framework SetupNDPv2.0.50727" "Version"
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StrCmp $1 "" +1 +2
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StrCpy $1 "2.0.50727.832"
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StrCmp $0 1 KnowNetFrameworkVersion +1
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ReadRegDWORD $0 HKLM "SOFTWAREMicrosoftNET Framework SetupNDPv1.1.4322" "Install"
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ReadRegDWORD $1 HKLM "SOFTWAREMicrosoftNET Framework SetupNDPv1.1.4322" "Version"
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StrCmp $1 "" +1 +2
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StrCpy $1 "1.1.4322.573"
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StrCmp $0 1 KnowNetFrameworkVersion +1
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ReadRegDWORD $0 HKLM "SOFTWAREMicrosoft.NETFrameworkpolicyv1.0""Install"
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ReadRegDWORD $1 HKLM "SOFTWAREMicrosoft.NETFrameworkpolicyv1.0""Version"
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StrCmp $1 "" +1 +2
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StrCpy $1 "1.0.3705.0"
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StrCmp $0 1 KnowNetFrameworkVersion +1
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StrCpy $1 "not .NetFramework"
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KnowNetFrameworkVersion:
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Pop $0
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Exch $1
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FunctionEnd

然后，在Section区段进行.NET静默安装：

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Section -.NET
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Call GetNetFrameworkVersion
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Pop $R1
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 ${If} $R1 < '4.0.30319'
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 SetDetailsPrint textonly
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 DetailPrint "正在安装 .NET Framework 4"
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 SetDetailsPrint listonly
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 SetOutPath "$TEMP"
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 SetOverwrite on
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 File "dotNetFx40_Full_x86_x64.exe"
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 ExecWait '$TEMPdotNetFx40_Full_x86_x64.exe /q /norestart /ChainingPackage FullX64Bootstrapper' $R1
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 Delete "$TEMPdotNetFx40_Full_x86_x64.exe"
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 ${EndIf}
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SectionEnd

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，效果可参考紫辰记账本安装程序。