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 17: | 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
