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- discard """
- disabled: "Windows"
- output: '''Full read size: 20
- Half read size: 10 Data: Hello'''
- """
- import memfiles, os
- import std/syncio
- const
- fn = "test.mmap"
- var
- mm, mm_full, mm_half: MemFile
- p: pointer
- if fileExists(fn): removeFile(fn)
- # Create a new file, data all zeros, starting at size 10
- mm = memfiles.open(fn, mode = fmReadWrite, newFileSize = 10, allowRemap=true)
- mm.resize 20 # resize up to 20
- mm.close()
- # read, change
- mm_full = memfiles.open(fn, mode = fmWrite, mappedSize = -1, allowRemap = true)
- let size = mm_full.size
- p = mm_full.mapMem(fmReadWrite, 20, 0)
- echo "Full read size: ", size
- var p2 = cast[cstring](p)
- p2[0] = 'H'
- p2[1] = 'e'
- p2[2] = 'l'
- p2[3] = 'l'
- p2[4] = 'o'
- p2[5] = '\0'
- mm_full.unmapMem(p, 20)
- mm_full.close()
- # read half, and verify data change
- mm_half = memfiles.open(fn, mode = fmRead, mappedSize = 10)
- echo "Half read size: ", mm_half.size, " Data: ", cast[cstring](mm_half.mem)
- mm_half.close()
- if fileExists(fn): removeFile(fn)
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