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26 lines
1.2 KiB
Plaintext
26 lines
1.2 KiB
Plaintext
The '''VARPTR''' function returns an [[INTEGER]] value that is the offset part of the variable or array memory address within it's segment.
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{{PageSyntax}}
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:: offset% = VARPTR(variable_name[(reference_index%)])
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* If variablename is not defined before VARPTR or [[VARSEG]] is called, the variable is created and it's address is returned.
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* Reference index is used to set the offset address of an array index, not necessarily the lowest index.
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* When a string variable, VARPTR returns the offset address location of the first byte of the string.
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* Because many Qbasic statements change the locations of variables in memory, use the values returned by VARPTR and VARSEG immediately after the functions are used!
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* Integer array sizes are limited to 32767 elements when using [[VARPTR]] in QB and '''QB64'''!. Create a larger array using [[_BYTE]]. Example: [[DIM]] [[SHARED]] Memory (65535) AS [[_UNSIGNED]] [[_BYTE]]
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* '''Warning: DEF SEG, VARSEG , VARPTR, PEEK or POKE access QB64's emulated 16 bit conventional memory block!'''
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: '''It is highly recommended that QB64's [[_MEM]] memory system be used to avoid running out of memory.'''
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''See also:''
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* [[BSAVE]], [[BLOAD]]
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* [[SADD]], [[DEF SEG]]
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* [[VARPTR$]], [[VARSEG]],
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* [[POKE]], [[PEEK]]
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{{PageNavigation}}
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