IDebugBreakpointChecksumRequest2::GetChecksum

擷取文件的總和檢查碼中斷點要求指定的總和檢查碼演算法的唯一識別項使用。

HRESULT GetChecksum( 
   REFGUID        guidAlgorithm,
   CHECKSUM_DATA *pChecksumData
);

public int GetChecksum( 
   ref Guid               guidAlgorithm,
   out enum_CHECKSUM_DATA pChecksumData
);

參數

• guidAlgorithm
  [in]唯一的加總檢查碼演算法識別項。

• pChecksumData
  [] out用中斷點要求的文件總和檢查碼。

傳回值

如果成功的話，會傳回S_OK。 否則，會傳回錯誤碼。

範例

下列範例會檢查文件，也就是要繫結，總和檢查碼是否符合從 UI 的函式。

bool CDebugProgram::DoChecksumsMatch(CDebugPendingBreakpoint *pPending, CDebugCodeContext *pContext)
{
    bool fRet = false;
    HRESULT hRes;

    // Get the checksum for the document we are about to bind to from the pdb side
    GUID guidAlgorithmId;
    BYTE *pChecksum = NULL;
    ULONG cNumBytes = 0;

    hRes = pContext->GetDocumentChecksumAndAlgorithmId(&guidAlgorithmId, &pChecksum, &cNumBytes);

    if ( S_OK == hRes )
    {
        // Get checksum data for the document from the UI (request) side
        CComPtr<IDebugBreakpointChecksumRequest2> pChecksumRequest;

        hRes = pPending->GetChecksumRequest(&pChecksumRequest);

        if ( S_OK == hRes )
        {
            CHECKSUM_DATA data;

            hRes = pChecksumRequest->GetChecksum(guidAlgorithmId, &data);

            if ( S_OK == hRes )
            {
                if ( data.ByteCount == cNumBytes && memcmp(data.pBytes, pChecksum, cNumBytes) == 0 )
                    fRet = true;
                else
                    fRet = false;

                // Free up data allocated for checksum data
                CoTaskMemFree(data.pBytes);
            }
            else
                fRet = true; // checksums not available - user disabed checksums
        }
        else
            fRet = true; // we couldn't get checksum from UI - default to past behavior

        // free up space allocated for checksum from pdb
        CoTaskMemFree(pChecksum);
    }
    else
        fRet = true; // we don't have a checksum to compare with.

    return ( fRet );
}

請參閱

參考

IDebugBreakpointChecksumRequest2