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09.02.2008 at 09:31AM PDT, ID: 23696560
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8.2

CopyMemory from array in collection to an array

Asked by rettiseert in Visual Basic Programming

Hello

This should be easy...

I have a collection of N byte arrays (each array having 256 elements from 0 to 255).
I have a byte array of N*256 elements (from 0 to N*256-1).

I need to copy all elements in the collection to the array, so for example if

Collection(1)(0) = 10, Collection(1)(1) = 11, ..., Collection(2)(0) = 20, ..., Collection(2)(255) = 99

then, after the copy, the array will look like:

Array(0) = 10, Array(1) = 11, ..., Array(256)=20 ..., Array(511) = 99

I want to do this using the CopyMemory API to increase speed, but my code produces a strange result: elements in the destination Array have "random" values after copy, whats wrong?

Thank youStart Free Trial 
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Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByVal lpvDest As Any, blpvSource As Any, ByVal cbCopy As Long)
 
Public Sub LoadTemplatesArray(ByVal Templates As Collection)
 
    Dim I As Long
 
    ReDim TemplatesArray(0 To Templates.Count * 256 - 1) As Byte
    
    For I = 0 To Templates.Count - 1
        CopyMemory ByVal VarPtr(TemplatesArray(I * 256)), ByVal VarPtr(Templates(I + 1)(0)), 256
    Next    
 
End Sub
 
Keywords: CopyMemory from array in collection to…
Title
1 CopyMemory API
2 CopyMemory
3 CopyMemory API
4 API CopyMemory
5 CopyMemory and Win2000
6 CopyMemory API
 
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[+][-]09.03.2008 at 11:15PM PDT, ID: 22384611

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[+][-]09.03.2008 at 11:28PM PDT, ID: 22384649

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About this solution

Zone: Visual Basic Programming
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Solution Provided By: aikimark
Participating Experts: 1
Solution Grade: A
 
 
 
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