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57 lines
2.6 KiB
Plaintext
57 lines
2.6 KiB
Plaintext
[[BLOAD]] loads a binary graphics file created by [[BSAVE]] to an array.
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==Legacy support==
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* '''QB64 can load larger arrays directly from binary files using [[PUT]] # and [[GET]] # without BLOAD. For that reason, BLOAD isn't recommended practice anymore and is supported to maintain compatibility with legacy code.'''
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{{PageSyntax}}
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: [[BLOAD]] {{Parameter|fileName$}}, [[VARPTR]]({{Parameter|imageArray%({{Parameter|index}})}})
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{{Parameters}}
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* {{Parameter|fileName$}} is the name of the file that the image should be [[BSAVE]]d to.
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* {{Parameter|imageArray%(index)}} is the [[INTEGER]] [[arrays|array]] start index to store the image loaded.
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{{PageDescription}}
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* There must be an [[INTEGER]] array of adequate size (up to 26K) to hold the graphic data.
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* A [[DEF SEG]] pointing to the array is required. [[DEF SEG]] = [[VARSEG]](imageArray%(index))
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* {{Parameter|index}} is the starting image element of the Array. Can also include RGB color settings at the start index.
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* Fullscreen images in [[SCREEN]] 12 require 3 file BLOADs. A 26K array can hold 1/3 of screen.
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* Custom RGB color settings can be embedded(indexed) at the start of the image array.
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* BLOAD can be used to load any array that was saved with [[BSAVE]], not just graphics.
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* Array sizes are limited to 32767 Integer elements due to use of [[VARPTR]] in QBasic and '''QB64''''s emulated conventional memory.
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{{PageExamples}}
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''Example 1:'' Loading data to an array from a BSAVED file.
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{{CodeStart}} '' ''
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{{Cl|DEF SEG}} = {{Cl|VARSEG}}(Array(0))
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{{Cl|BLOAD}} filename$, {{Cl|VARPTR}}(Array({{Cl|LBOUND}}(Array))) ' changeable index
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{{Cl|DEF SEG}} '' ''
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{{CodeEnd}}
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:''Explanation:'' Referance any type of array that matches the data saved. Can work with Integer, Single, Double, Long, fixed length Strings or [[TYPE]] arrays. [[LBOUND]] determines the starting offset of the array or another index could be used.
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''Example 2:'' Using a QB default colored image.
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{{CodeStart}} '' ''
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{{Cl|DEF SEG}} = {{Cl|VARSEG}}(Image%(0)) ' pointer to first image element of an array
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{{Cl|BLOAD}} FileName$, {{Cl|VARPTR}}(Image%(0)) ' place data into array at index position 0
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{{Cl|PUT (graphics statement)|PUT}}(Col, Row), Image%(0), PSET ' Put the image on the screen from index 0
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{{Cl|DEF SEG}} '' ''
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{{CodeEnd}}
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: ''Note:'' [[PSET]] is used as a [[PUT (graphics statement)|PUT]] action that places the image over any background objects.
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{{PageSeeAlso}}
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* [[BSAVE]], [[OPEN]], [[BINARY]]
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* [[PUT]], [[GET]] {{text|(file statement)}}
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* [[GET (graphics statement)]], [[PUT (graphics statement)]]
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* [[VARSEG]], [[VARPTR]]
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* [[DEF SEG]]
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* [[Text Using Graphics]]
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{{PageNavigation}}
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