Solved Lift cstruct 64K limit

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Dave Rabelink
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Lift cstruct 64K limit

Post by Dave Rabelink » 10 Mar 2014, 13:50

I knew about the 64k limitation of cstruct functions CStructCopyToFarMem and CStructCopyFromFarMem, but I forgot ;)

So to my surprise I discovered TD62 still has this ridiculous limitation.

See test application has two testcases:

- Create a string buffer which exceeds 64k, copy it to farmem and copy back to a new buffer
- Load a bitmap file which exceeds 64k, copy it to farmem and copy back and display in a picture object
64k-limit.png
Clearly the cstruct way will result in a cutoff buffer, limit of 64K.
(the string buffer reports a wrong text length, the testcase using the bitmap will show a truncated image).

The test application also shows the possible workaround, using memcpy/RtlMoveMemory WinApi functions.
(uncheck the cstruct checkboxes to use the workaround).
Both ANSI and UNICODE versions are available.

Please lift this old limitation to support "unlimited" buffer sizes using cstruct.
CStruct_64k-limit.zip
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Regards,
Dave Rabelink

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markus.essmayr
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Re: Lift cstruct 64K limit

Post by markus.essmayr » 11 Mar 2014, 07:47

:shock:

+1000
Markus Eßmayr
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H3PO4
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Re: Lift cstruct 64K limit

Post by H3PO4 » 11 Mar 2014, 08:13

+ 1

Igor Ivanovic
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Re: Lift cstruct 64K limit

Post by Igor Ivanovic » 12 Mar 2014, 10:44

lrcuess wrote:+1000
(What he said) * 100
Igor Ivanovic
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Dave Rabelink
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Netherlands
Posts: 3384
Joined: 24 Feb 2017, 09:12
Location: Gouda, The Netherlands

Re: Lift cstruct 64K limit

Post by Dave Rabelink » 24 Oct 2016, 08:04

I just want to inform that the 64k limitation is lifted in TD 7.0 (x86 and x64).
Regards,
Dave Rabelink

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