Product version string from an exe - nsis - nsis

Question

I want to read the product version (optional string) from a given executable (actually from the installer I'm trying to create if it makes any difference), if it is possible at the run-time. This string will be further used to download files from a link.
Thank you very much !

Answer 1

NSIS does not have native support for reading anything other than VS_FIXEDFILEINFO->dwFileVersion so you have to call the Windows API directly:
; Add some version information so we have something to test
VIProductVersion 1.2.3.4
VIAddVersionKey "ProductVersion" "One Two Three Four"
VIAddVersionKey "FileVersion" "Whatever"
VIAddVersionKey "FileDescription" "Whatever"
VIAddVersionKey "LegalCopyright" "(C) Whatever"
!include LogicLib.nsh
Function GetFileVerFirstLangProductVersion
System::Store S
pop $3
push "" ;failed ret
System::Call 'version::GetFileVersionInfoSize(t"$3",i.r2)i.r0'
${If} $0 <> 0
System::Alloc $0
System::Call 'version::GetFileVersionInfo(t"$3",ir2,ir0,isr1)i.r0 ? e'
pop $2
${If} $0 <> 0
${AndIf} $2 = 0 ;a user comment on MSDN said you should check GLE to avoid crash
System::Call 'version::VerQueryValue(i r1,t "\VarFileInfo\Translation",*i0r2,*i0)i.r0'
${If} $0 <> 0
System::Call '*$2(&i2.r2,&i2.r3)'
IntFmt $2 %04x $2
IntFmt $3 %04x $3
System::Call 'version::VerQueryValue(i r1,t "\StringFileInfo\$2$3\ProductVersion",*i0r2,*i0r3)i.r0'
${If} $0 <> 0
pop $0
System::Call *$2(&t$3.s)
${EndIf}
${EndIf}
${EndIf}
System::Free $1
${EndIf}
System::Store L
FunctionEnd
Section
Push "$ExePath" ; Read our own version information in this example
Call GetFileVerFirstLangProductVersion
Pop $0
DetailPrint "ProductVersion=$0"
SectionEnd