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Single to Byte HELP!
Posted on 2001-08-10
OK,
My prob is this:
I get a single as in-parameter in (32 Bits)
I need to convert this to four seperate bytes (8*4 bits)
in-param Single = [1010101010101010101010101
the trick is that this has no meaning at all, i need to put the first 8 bits in to a byte and the next 8 into another, like this:
Byte_1 = [10101010]
Byte_2 = [10101010]
Byte_3 = [10101010]
Byte_4 = [10101010]
Now I can interpret the byte as four different chars
need this fast
Thankyou
Claes Ylving
My prob is this:
I get a single as in-parameter in (32 Bits)
I need to convert this to four seperate bytes (8*4 bits)
in-param Single = [1010101010101010101010101
the trick is that this has no meaning at all, i need to put the first 8 bits in to a byte and the next 8 into another, like this:
Byte_1 = [10101010]
Byte_2 = [10101010]
Byte_3 = [10101010]
Byte_4 = [10101010]
Now I can interpret the byte as four different chars
need this fast
Thankyou
Claes Ylving
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8 Comments
Private Sub Command2_Click()
Dim bytes(0 To 7)
Dim c As Long
dHex 3.141592654, bytes
For c = 0 To 7
Print bytes(c)
Next
End Sub
'in a .bas
Option Explicit
Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)
Public Function dHex(dblVal As Double, byteArray) As String
'double variable ONLY to hex
Dim c As Long, dHex2 As String
Dim dVal As Double, sTemp As String
Dim b(0 To 8) As Byte
dVal = CDbl(dblVal)
CopyMemory b(0), dVal, 8
For c = 0 To 7
byteArray(c) = b(c)
Next
'Debug.Print b(0), b(1), b(2), b(3), b(4), b(5), b(6), b(7)
For c = 0 To 7
sTemp = Hex(b(c))
sTemp = String(2 - Len(sTemp), "0") & sTemp
dHex2 = dHex2 & sTemp
Next
dHex = dHex2
For c = 1 To 8
If Mid(dHex2, c, 1) = "0" Then
dHex = Mid(dHex, 2)
Else
Exit For
End If
Next
If dHex = "" Then dHex = "0"
End Function
Dim bytes(0 To 7)
Dim c As Long
dHex 3.141592654, bytes
For c = 0 To 7
Print bytes(c)
Next
End Sub
'in a .bas
Option Explicit
Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)
Public Function dHex(dblVal As Double, byteArray) As String
'double variable ONLY to hex
Dim c As Long, dHex2 As String
Dim dVal As Double, sTemp As String
Dim b(0 To 8) As Byte
dVal = CDbl(dblVal)
CopyMemory b(0), dVal, 8
For c = 0 To 7
byteArray(c) = b(c)
Next
'Debug.Print b(0), b(1), b(2), b(3), b(4), b(5), b(6), b(7)
For c = 0 To 7
sTemp = Hex(b(c))
sTemp = String(2 - Len(sTemp), "0") & sTemp
dHex2 = dHex2 & sTemp
Next
dHex = dHex2
For c = 1 To 8
If Mid(dHex2, c, 1) = "0" Then
dHex = Mid(dHex, 2)
Else
Exit For
End If
Next
If dHex = "" Then dHex = "0"
End Function
'sorry I see you are using a single (4 bytes)
Private Sub Command2_Click()
Dim bytes(0 To 3)
Dim c As Long
Dim x As String
x = sHex(3.14159, bytes)
For c = 0 To 3
Print bytes(c)
Next
Print x
End Sub
in a .bas
Option Explicit
Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)
Public Function sDec(ByVal strVal As String) As Single
'8 character hex to double
Dim c As Long
Dim dblVal As Single
Dim b(0 To 3) As Byte
If Len(strVal) < 8 Then strVal = String(8 - Len(strVal), "0") & strVal
For c = 0 To 3
b(c) = Val("&H" & Mid(strVal, c * 2 + 1, 2))
Next
'Debug.Print b(0), b(1), b(2), b(3)
CopyMemory dblVal, b(0), 4
'Debug.Print dblVal
sDec = dblVal
End Function
Private Sub Command2_Click()
Dim bytes(0 To 3)
Dim c As Long
Dim x As String
x = sHex(3.14159, bytes)
For c = 0 To 3
Print bytes(c)
Next
Print x
End Sub
in a .bas
Option Explicit
Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal cbCopy As Long)
Public Function sDec(ByVal strVal As String) As Single
'8 character hex to double
Dim c As Long
Dim dblVal As Single
Dim b(0 To 3) As Byte
If Len(strVal) < 8 Then strVal = String(8 - Len(strVal), "0") & strVal
For c = 0 To 3
b(c) = Val("&H" & Mid(strVal, c * 2 + 1, 2))
Next
'Debug.Print b(0), b(1), b(2), b(3)
CopyMemory dblVal, b(0), 4
'Debug.Print dblVal
sDec = dblVal
End Function
'hold on, third time lucky maybe
Private Sub Command2_Click()
Dim bytes(0 To 3)
Dim c As Long
Dim x As String
x = sHex(3.14159, bytes)
For c = 0 To 3
Print bytes(c)
Next
Print x
End Sub
'in a .bas
Public Function sHex(sngVal As Single, bytearray) As String
'single variable ONLY to hex
Dim c As Long, dHex2 As String
Dim sVal As Single, sTemp As String
sVal = CSng(sngVal)
Dim b(0 To 3) As Byte
Dim z As Single
CopyMemory b(0), sVal, 4
'Debug.Print b(0), b(1), b(2), b(3)
For c = 0 To 3
sTemp = Hex(b(c))
sTemp = String(2 - Len(sTemp), "0") & sTemp
dHex2 = dHex2 & sTemp
bytearray(c) = b(c)
Next
sHex = dHex2
For c = 1 To 4
If Mid(dHex2, c, 1) = "0" Then
sHex = Mid(sHex, 2)
Else
Exit For
End If
Next
If sHex = "" Then sHex = "0"
End Function
Private Sub Command2_Click()
Dim bytes(0 To 3)
Dim c As Long
Dim x As String
x = sHex(3.14159, bytes)
For c = 0 To 3
Print bytes(c)
Next
Print x
End Sub
'in a .bas
Public Function sHex(sngVal As Single, bytearray) As String
'single variable ONLY to hex
Dim c As Long, dHex2 As String
Dim sVal As Single, sTemp As String
sVal = CSng(sngVal)
Dim b(0 To 3) As Byte
Dim z As Single
CopyMemory b(0), sVal, 4
'Debug.Print b(0), b(1), b(2), b(3)
For c = 0 To 3
sTemp = Hex(b(c))
sTemp = String(2 - Len(sTemp), "0") & sTemp
dHex2 = dHex2 & sTemp
bytearray(c) = b(c)
Next
sHex = dHex2
For c = 1 To 4
If Mid(dHex2, c, 1) = "0" Then
sHex = Mid(sHex, 2)
Else
Exit For
End If
Next
If sHex = "" Then sHex = "0"
End Function
Why all the dancing around with strings deighton? Just make sure the byte array has 4 elements or you
can crash nicely.
Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal
cbCopy As Long)
public sub SngToByte(sngIn as single, bytOut() as byte)
copymemory bytOut(lbound(bytout)), sngIn, 4
end sub
public sub ByteToSng(sngOut as single, bytIn() as byte)
copymemory sngOut, bytIn(lbound(bytIn)), 4
end sub
can crash nicely.
Declare Sub CopyMemory Lib "kernel32.dll" Alias "RtlMoveMemory" (hpvDest As Any, hpvSource As Any, ByVal
cbCopy As Long)
public sub SngToByte(sngIn as single, bytOut() as byte)
copymemory bytOut(lbound(bytout)), sngIn, 4
end sub
public sub ByteToSng(sngOut as single, bytIn() as byte)
copymemory sngOut, bytIn(lbound(bytIn)), 4
end sub
THANKYOU PaulHews AND deighton!!
both gave me EXCELENT answers and fast ones! I would like to split the points between u two but since I have to choose the vote will fall on Paul's as his answer has less code. Thanx!
Regards
Claes Ylving
both gave me EXCELENT answers and fast ones! I would like to split the points between u two but since I have to choose the vote will fall on Paul's as his answer has less code. Thanx!
Regards
Claes Ylving
THANKYOU PaulHews AND deighton!!
both gave me EXCELENT answers and fast ones! I would like to split the points between u two but since I have to choose the vote will fall on Paul's as his answer has less code. Thanx!
Regards
Claes Ylving
both gave me EXCELENT answers and fast ones! I would like to split the points between u two but since I have to choose the vote will fall on Paul's as his answer has less code. Thanx!
Regards
Claes Ylving
For deighton.
http://www.experts-exchange.com/jsp/qManageQuestion.jsp?ta=visualbasic&qid=20166514
Was basically supporting your answer.
http://www.experts-exchange.com/jsp/qManageQuestion.jsp?ta=visualbasic&qid=20166514
Was basically supporting your answer.
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