Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

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Hai All,
Whenever i debug my application i got this run time error . . . Here itz my Code

VB

Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByVal pDst As IntPtr, ByVal pSrc As IntPtr, ByVal ByteLen As Integer)
    Private Sub SingleToIEEE754()

        Dim bBytes(0 To 3) As Byte
        Dim rMyNumber As Single
        'Dim i As Integer

        rMyNumber = 333.7
        Call CopyMemory(bBytes(0), rMyNumber, 4)

        MsgBox(Hex$(bBytes(3)) & " " & Hex$(bBytes(2)) & " " & Hex$(bBytes(1)) & " " & Hex$(bBytes(0)))
    End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

VB

SingleToIEEE754()
    End Sub

Whenever i click on Button2 the run time error: "AccessViolationException was Unhandeld .."

Quote:
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Can Any body help me .........
Thanks In ADV

Posted 10-Mar-12 0:56am

Himachandra

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OriginalGriff · Answer 1 · 2012-03-10T01:04:00

Solution 1

Those aren't pointers.
So when you call the external routine, and it thinks they are, it tries to access memory that doesn't exist, or isn't yours, or...
And so it throws an exception.
Why don't you just use the BitConverter class?

VB

Dim f As Single = 333.7F
Dim bytes As Byte() = BitConverter.GetBytes(f)

Posted 10-Mar-12 1:04am

OriginalGriff

Comments

Himachandra 10-Mar-12 7:27am

Thanks For reply..

How should i see the conversion bytes...?

Himachandra 10-Mar-12 7:32am

When i see the output of bytes like " MsgBox(bytes) "this i got Error
Argument 'Prompt' cannot be converted to type 'String'.

OriginalGriff 10-Mar-12 7:38am

If you looked at your own code sample, you might get a clue...

MsgBox(Hex$(bytes(3)) & " " & Hex$(bytes(2)) & " " & Hex$(bytes(1)) & " " & Hex$(bytes(0)))

OriginalGriff 10-Mar-12 7:39am

Out of interest, what are you trying to achieve? Why are you converting floating point numbers to hex anyway?