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46 lines
1.4 KiB
Markdown
46 lines
1.4 KiB
Markdown
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See [DECLARE LIBRARY](DECLARE-LIBRARY).
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The [ALIAS](ALIAS) clause in a [DECLARE LIBRARY](DECLARE-LIBRARY) statement block tells the program the name of the procedure used in the external library.
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## Syntax
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> SUB *pseudoname* [ALIAS](ALIAS) *actualname* [(*parameters*)]
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## Parameter(s)
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* The *pseudo name* is the name of the [SUB](SUB) or [FUNCTION](FUNCTION) the QB64 program will use.
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* The *actual name* is the same procedure name as it is inside of the DLL library.
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* QB64 must use all parameters of imported procedures including optional ones.
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## Description
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* The ALIAS name clause is optional as the original library procedure name can be used.
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* The procedure name does not have to be inside of quotes when using [DECLARE LIBRARY](DECLARE-LIBRARY).
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* QB64 does not support optional parameters.
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## Example(s)
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Instead of creating a SUB with the Library statement inside of it, just rename it:
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```vb
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DECLARE LIBRARY
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SUB MouseMove ALIAS glutWarpPointer (BYVAL xoffset&, BYVAL yoffset&)
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END DECLARE
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DO UNTIL _SCREENEXISTS: LOOP
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PRINT "Hit a key..."
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SLEEP
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MouseMove 1, 1
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```
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> *Explanation:* When a Library procedure is used to represent another procedure name use ALIAS instead. Saves creating a SUB! Just place your name for the procedure first with the actual Library name after ALIAS.
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## See Also
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* [SUB](SUB), [FUNCTION](FUNCTION)
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* [DECLARE LIBRARY](DECLARE-LIBRARY), [BYVAL](BYVAL)
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* [DECLARE DYNAMIC LIBRARY](DECLARE-DYNAMIC-LIBRARY)
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