QuickHash Library Type Library

CRC32_Final

void CRC32_Final( [in, out]CRC32_Context* pContext, [out]CRC32_Digest* pDigest );
 

Parameters

pContext

    [in/out] A memory buffer that is used as the context.

     Note. All predefined types are specified in the Predefined Types List.

 pDigest

    [out] A memory buffer that will receive the checksum.

     Note. All predefined types are specified in the Predefined Types List.

Remarks

Call this function to retrieve the CRC32 checksum from the pContext context. The checksum is retrieved in the pDigest memory buffer.

After the CRC32_Final function is performed, the context is initialized for new calculations, as it would be called CRC32_Init again.

Note. Before the first call to CRC32_Update, CRC32_UpdateStr, CRC32_Final or CRC32_FinalHex functions, the context must be initialized with CRC32_Init.

VB Example

Private Sub MyButton_Click()   
    Dim Context As CRC32_Context
    Dim Checksum As CRC32_Digest
    Dim MyStrData As String
    MyStrData = "Hello World!"
    Dim nLen As Long
    nLen = Len(MyStrData)
    'Convert the string to byte array
    Dim MyBinData() As Byte
    ReDim MyBinData(1 To nLen)    
    For i = 1 To nLen
        MyBinData(i) = Asc(Mid(MyStrData, i, 1))
    Next i    
    'Initialize the context
    CRC32_Init Context
    'Update the context with first part
    Dim nFirstLen As Long
    nFirstLen = nLen / 3
    CRC32_Update Context, MyBinData(1), nFirstLen
    'Update the context with second part
    CRC32_Update Context, MyBinData(nFirstLen + 1), nLen - nFirstLen
    'Get the checksum
    CRC32_Final Context, Checksum
    'Show the hexadecimal representation of the checksum
    MsgBox QHASH_ConvertToHex(Checksum.Value(0), CRC32_DIGESTSIZE, True)
End Sub

 

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See Also    CRC32_FinalHex, CRC32_Update, CRC32_UpdateStr, CRC32_Init, QHASH_ConvertToHex


 

 

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