IPersistFileCheckSum.CalculateCheckSum(Guid, UInt32, Byte[], UInt32) Method

Definition

Namespace:

Microsoft.VisualStudio.TextManager.Interop

Assembly:

Microsoft.VisualStudio.Interop.dll

Package:

Microsoft.VisualStudio.Interop v17.12.40391

Calculates the check sum for the file representation of the associated text buffer using the specified algorithm.

public:
 int CalculateCheckSum(Guid % guidCheckSumAlgorithm, System::UInt32 cbBufferSize, cli::array <System::Byte> ^ pbHash, [Runtime::InteropServices::Out] System::UInt32 % pcbActualSize);

public int CalculateCheckSum (ref Guid guidCheckSumAlgorithm, uint cbBufferSize, byte[] pbHash, out uint pcbActualSize);

abstract member CalculateCheckSum : Guid * uint32 * byte[] * uint32 -> int

Public Function CalculateCheckSum (ByRef guidCheckSumAlgorithm As Guid, cbBufferSize As UInteger, pbHash As Byte(), ByRef pcbActualSize As UInteger) As Integer

Parameters

guidCheckSumAlgorithm

Guid

[in] GUID representing the algorithm to use

cbBufferSize

UInt32

[in] Buffer size passed in

pbHash

Byte[]

[out] Buffer into which the checksum is written

pcbActualSize

UInt32

[out] Buffer size required

Returns

Int32

If the method succeeds, it returns S_OK. If it fails, it returns an error code.

Remarks

COM Signature

From textmgr2.idl:

HRESULT IPersistFileCheckSum::CalculateCheckSum(  
   [in] REFGUID guidCheckSumAlgorithm,  
   [in] DWORD cbBufferSize,  
   [out, size_is(cbBufferSize)] BYTE *pbHash,  
   [out] DWORD *pcbActualSize  
);  

If the passed-in buffer size i.e. cbBufferSize is non-zero, then this function returns E_INVALIDARG. But if the passed in buffer size is zero, it returns success. In both cases, the required buffer size is return via pcbActualSize. For the MD5 algorithm, the maximum required buffer size required is 16 bytes. For the SHA1 algorithm, the maximum required buffer size is 20 bytes