retrieve variable value from nsh file nsis

Question

I am creating installer using nsis. I have created .nsh file using SIMPLE SC to start, stop and remove services. I have used macros for this.

When I call this in nsi file it works. But I would like to know the return value for start service (SimpleSC::StartService "${SVC}" "${Args}" "${Timeout}", Pop $0). how do I retrieve the $0 value of nsh file in my nsis file

Answer 1

If you have some helper macros that return a result, you can leave the result on the stack:

!macro DoSomething
Push $0
Push $1

Push "Pretend that this is a function that does something and puts the result on the stack"
Pop $0 ; Result we want to return

Pop $1
Exch $0
!macroend

!insertmacro DoSomething
Pop $0
MessageBox MB_OK $0

or store it in a register as part of the macro:

!macro DoSomething outvar
Push $0
Push $1

Push "Pretend that this is a function that does something and puts the result on the stack"
Pop $0 ; Result we want to return

Pop $1
Exch $0
Pop ${outvar}
!macroend

!insertmacro DoSomething $0
MessageBox MB_OK $0