Question

!include LogicLib.nsh
!include StrFunc.nsh
${StrLoc}

Section

ReadRegStr $0 HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems" "Windows"

${StrLoc} $7 $0 "SharedSection=" ">" ; Find "SharedSection="
StrCpy $R1 $0 $7 ; Save the stuff before "SharedSection="
StrCpy $R2 $0 "" $7
${StrLoc} $8 $R2 " " ">" ; Find the end of "SharedSection=#,#,#" by looking for a space
${IfThen} $8 = 0 ${|} StrLen $8 $R2 ${|}
StrCpy $R3 $R2 "" $8 ; Save the stuff after "SharedSection=#,#,#"
StrCpy $R2 $0 $8 $7 ; Save "SharedSection=#,#,#"
; We can now parse "SharedSection=#,#,#":
StrLen $8 $R2
findcomma:
    IntOp $8 $8 - 1
    StrCpy $1 $R2 1 $8
    StrCmp $1 "," findcomma_end
    StrCmp $1 "" findcomma_end findcomma
findcomma_end:
IntOp $9 $8 + 1
StrCpy $2 $R2 "" $9
${If} $1 != "" ; Only edit if we found the comma..
${AndIf} $2 != "" ; ..And there was something after the comma
    StrCpy $R2 $R2 $8 ; Copy the first part of the string
    StrCpy $R2 "$R2,1536" ; Append the final comma and number
${EndIf}
StrCpy $0 "$R1$R2$R3" ; Build the final string

DetailPrint Result=$0
# TODO: WriteRegStr HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems" "Windows" $0

SectionEnd

此代码中l的值返回True。这怎么可能？按照评估顺序，比较优先于“或不，和”运算符。

Answer 1

它们确实具有更高的优先级，但or operator works by：

表达式x or y首先评估x;如果x为真，则返回其值;否则，将评估y并返回结果值。

由于k为3.3333333333333335，表达式k <= 3为False，True将被评估（自身）并返回制作{{1} }}

Python中的评估顺序

1 个答案: