Get directory of installed .NET runtime
From NSIS Wiki
Given a .Net version number, this function returns that .Net framework's install directory. This is useful if you intend to call 'RegAsm.exe', or 'GACUtil.exe' on one of your .Net assembly DLLs, since these executables are stored in the directory this function returns.
in: version of .Net framework required (eg. "v2.0")
out: directory in which it is installed (eg. "C:\WINNT\Microsoft.NET\Framework\v2.0.50727")
Returns "" if the specified version of the .Net framework does not appear to be installed.
Section "Install" ; get directory of .NET framework installation Push "v2.0" Call GetDotNetDir Pop $R0 ; .net framework v2.0 installation directory StrCmpS "" $R0 err_dot_net_not_found ; Perform our install ; e.g. use the .Net path in $R0 to call RegAsm.exe SetOutPath $INSTDIR File "MyDll.dll" ExecWait '"$R0\RegAsm.exe" MyDll.dll' Return err_dot_net_not_found: Abort "Aborted: .Net framework not found." SectionEnd
; Given a .NET version number, this function returns that .NET framework's ; install directory. Returns "" if the given .NET version is not installed. ; Params: [version] (eg. "v2.0") ; Return: [dir] (eg. "C:\WINNT\Microsoft.NET\Framework\v2.0.50727") Function GetDotNetDir Exch $R0 ; Set R0 to .net version major Push $R1 Push $R2 ; set R1 to minor version number of the installed .NET runtime EnumRegValue $R1 HKLM \ "Software\Microsoft\.NetFramework\policy\$R0" 0 IfErrors getdotnetdir_err ; set R2 to .NET install dir root ReadRegStr $R2 HKLM \ "Software\Microsoft\.NetFramework" "InstallRoot" IfErrors getdotnetdir_err ; set R0 to the .NET install dir full StrCpy $R0 "$R2$R0.$R1" getdotnetdir_end: Pop $R2 Pop $R1 Exch $R0 ; return .net install dir full Return getdotnetdir_err: StrCpy $R0 "" Goto getdotnetdir_end FunctionEnd
It is difficult to know for sure whether calls to external programs, such as RegAsm.exe, in the example above, really succeeded. Redirecting the output of RegAsm.exe to a file, and then opening the file to look for the magic words "Types succesfully registered." will yeild some success, but is problematic on older version of Windows (NT or 95/98/ME).
More reliably, and more simply, use 'nsExec', an extension which ships with the default NSIS install, to call external executables like RegAsm.exe. This automatically displays the stdout from the called executable in the install details log, and also checks for successfull execution.