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检查变量是否存在于NSIS中的最佳方法是什么?NSIS:如何检查变量是否存在
目前,我做这样的事情:
${If} $NonExistentVar == $$NonExistentVar
但正如预期的情况下,现有的VAR some_var
有$some_var
值这是不行的,我知道这是罕见的,但,有没有更好的办法检查它?
section non_existent_var
detailprint "non existent: $NonExistentVar"
var /global ExistentVar
detailprint "existent: $ExistentVar"
${If} $NonExistentVar == $$NonExistentVar
detailprint "PASS: NonExistent doesn't exist"
${Else}
detailprint "FAIL: NonExistent exists"
${EndIf}
${If} $ExistentVar == $$ExistentVar
detailprint "FAIL: ExistentVar doesn't exist"
${Else}
detailprint "PASS: ExistentVar exists"
${EndIf}
strcpy $ExistentVar "$$ExistentVar"
${If} $ExistentVar == $$ExistentVar
detailprint "FAIL: ExistentVar doesn't exist"
${Else}
detailprint "PASS: ExistentVar exists"
${EndIf}
SectionEnd
给出:
non existent: $NonExistentVar
existent:
PASS: NonExistent doesn't exist
PASS: ExistentVar exists
FAIL: ExistentVar doesn't exist
Completed