Tutorial: Using labels in macro's: Difference between revisions
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{{PageAuthor|Afrow UK}} | |||
== Description == | == Description == | ||
Labels work fine in | Labels work fine in macros until you start to insert the macros more than once in the same Section or Function! | ||
== Solution == | == Solution == | ||
The work-around for this problem is quite | The work-around for this problem is quite simple… | ||
<highlight-nsis> | <highlight-nsis> | ||
## Our macro | ## Our macro | ||
Line 21: | Line 19: | ||
</highlight-nsis> | </highlight-nsis> | ||
What we do is create a unique identity (${UniqueID}) for each instance of !insertmacro and place this unique identity in each label reference. This ensures that all label groups are unique no matter how many times we use !insertmacro. | What we do is create a unique identity (<code>${UniqueID}</code>) for each instance of <code>[[Reference/!insertmacro|!insertmacro]]</code> and place this unique identity in each label reference. This ensures that all label groups are unique no matter how many times we use <code>!insertmacro</code>. | ||
We use ${__LINE__} (current line number) for the UniqueID as it will always change between each !define. We have to !undef-ine UniqueID at the end of the macro too, so the next !insertmacro can re-define a new line number to UniqueID. | We use <code>${__LINE__}</code> (current line number) for the UniqueID as it will always change between each <code>[[Reference/!define|!define]]</code>. We have to <code>[[Reference/!undef|!undef]]</code>-ine UniqueID at the end of the macro too, so the next <code>!insertmacro</code> can re-define a new line number to UniqueID. | ||
-Stu | -Stu | ||
[[Category:Tutorials]] |
Latest revision as of 13:32, 12 December 2017
Author: Afrow UK (talk, contrib) |
Description
Labels work fine in macros until you start to insert the macros more than once in the same Section or Function!
Solution
The work-around for this problem is quite simple…
## Our macro !macro DoSomething Param !define UniqueID ${__LINE__} StrCmp ${Param} "something" 0 NoSomething_${UniqueID} ... NoSomething_${UniqueID}: !undef UniqueID !macroend
What we do is create a unique identity (${UniqueID}
) for each instance of !insertmacro
and place this unique identity in each label reference. This ensures that all label groups are unique no matter how many times we use !insertmacro
.
We use ${__LINE__}
(current line number) for the UniqueID as it will always change between each !define
. We have to !undef
-ine UniqueID at the end of the macro too, so the next !insertmacro
can re-define a new line number to UniqueID.
-Stu