Reference/ReadRegStr
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ReadRegStr
user_var(output) root_key sub_key name
Reads from the registry into the user variable $x. Valid values for root_key are listed under WriteRegStr. The error flag will be set and $x will be set to an empty string ("") if the string is not present or longer than NSIS_MAX_STRLEN. If the value is present, but is of type REG_DWORD, it will be read and converted to a string and the error flag will be set.
ReadRegStr $0 HKLM Software\NSIS "" DetailPrint "NSIS is installed at: $0"
Command introduced with NSIS v1.2g
