readRegSTr not working

Section
ReadRegStr $W HKLM SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\test UninstallString
IfErrors 0 +2
ExecWait '$W /S'
SectionEnd

is there anything incorrect in this?

cannot compile it
Usage: ReadRegStr $(user_var: output) rootkey subkey entry
root_key=(HKCR|HKLM|HKCU|HKU|HKCC|HKDD|HKPD|SHCTX)
Error in script "C:\save\nsis-2.12\test.nsi" on line 41 -- aborting creation process

Do you have

Var W

definition?

i dont have,,
do i need it?

yep, you do.

Var W
should be placed BEFORE you use $W the first time.

but you may also just use register variables, like $0.
they are already defined by nsis itself.

ReadRegStr $0 HKLM SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\test UninstallString
IfErrors 0 +2
ExecWait '$0 /S'
SetOutPath "$INSTDIR"
------------------------------------------------------------

is this ok?
but seems not working very well

my installer does not ExecWait '$0 /S'

the reg entry is exist

And your IfErrors logic is incorrect.

IfErrors [jump_if_errors] [jump_if_no_errors]

So, you are only executing the ExecWait instruction if ReadRegStr fails.
Another problem with your code (unless you have just missed it from your code snippet) is that you are not using ClearErrors before ReadRegStr. Therefore if ReadRegStr was successul and something else before caused an error then your ExecWait instruction will still not be executed.

Section

  ClearErrors

  ReadRegStr $0 HKLM SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\test UninstallString

  IfErrors +2

    ExecWait '"$0" /S'

SectionEnd

[/code]

-Stu

thanks for the help!