Illegal Function - QB64 Wiki

Illegal Function

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Illegal Function Call returns ERROR Code 5 when a parameter does not match the function type or exceeds function limitations.


1) Graphic objects such as LINE, CIRCLE, PSET, PRESET and DRAW statements must use a graphic SCREEN mode other than the default SCREEN 0.

2) GET (graphics statement) and PUT (graphics statement) cannot use offscreen coordinates in QB. QB64 allows offscreen GETs, but PUT statements can only be used offscreen using the PUT _CLIP syntax. Graphic SCREEN modes are 1, 2, 7 through 13 only!


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