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  SQL Server Tips by Gama and Naughter


XP_HTMLENCODE loops through every character from the input string and stores the output in a buffer. XP_HTMLENCODE2 uses another approach, which is to use the EscapeXML from the ATL Server library. The result is that the code is much simpler to maintain and also handles Unicode in addition to ASCII input.

The input data is read and converted to a Unicode string using the XP++ framework:

wchar_t* pwszInputBuffer = XP_UNICODETEXT(m_pParameterData[HTMLENCODE2_INPUT_PARAMETER_INDEX].m_Data);

Then simply calling the ATL function does the conversion:

int nEscapedLen = ATL::EscapeXML(pwszInputBuffer, nInputLen, pwszOutputBuffer, nOutputSize, ATL_ESC_FLAG_ATTR);
pwszOutputBuffer[nEscapedLen] = L'\0';

Finally the data is returned in the output parameter:

ParamSetOutput(HTMLENCODE2_OUTPUT_PARAMETER_INDEX + 1, (unsigned char *)pwszOutputBuffer, nEscapedLen*sizeof(wchar_t), FALSE);
char* pszOutput = W2A(pwszOutputBuffer);
int nOutputLength = (int) strlen(pszOutput);

ParamSetOutput(HTMLENCODE2_OUTPUT_PARAMETER_INDEX + 1, (unsigned char *)pszOutput, nOutputLength, FALSE);

The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter  


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