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Thread: winApi CopyMemory

  1. #1
    VBAX Newbie
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    winApi CopyMemory

    Hi, its possible pass length as reference? I have function what get BSTRptr (pointer to BSTR struct), so length pointer is BSTRptr - 4. Its possible pass this pointer directly, or its necessary do somethig as...

    Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, Length As Long)

    .....
    dim i as long
    CopyMemory i, byval BSTRptr - 4, byval 4
    .....

    ... dereference and pass value?

  2. #2
    VBAX Sage
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    Maybe 2 steps?

    But your second CopyMemory looks like it will put too much at the location of the 4 byte "I", overwriting what follows


    Option Explicit
    
    Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (Destination As Any, Source As Any, Length As Long)
    
    Sub test()
        Dim i As Long, L As Long
        CopyMemory L, ByVal BSTRptr - 4, 4
    
        CopyMemory i, ByVal BSTRptr - 4, L
    End Sub
    ---------------------------------------------------------------------------------------------------------------------

    Paul


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  3. #3
    VBAX Newbie
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    I know, but is possible do it in one step? When i know address where is length saved?

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