How do we use WWSAPI generated functions that have a WS_XML_BUFFER* because of a 'fallback'?

Question

Hi,
I have a wsutil generated header file that 'fell back' to using the WS_XML_BUFFER, does anyone know how we are to generate these buffers for 'fall back' generated functions...

// operation: DLLogonSoap_ValidateLogon
HRESULT WINAPI DLLogonSoap_ValidateLogon(
    __in WS_SERVICE_PROXY* _serviceProxy,
    __in_opt __nullterminated WCHAR* sCurrentSessionID, 
    __in WS_XML_BUFFER* LogonFlags, 
    __out int* ValidateLogonResult, 
    __in WS_HEAP* _heap,
    __in_ecount_opt(_callPropertyCount) const WS_CALL_PROPERTY* _callProperties,
    __in const ULONG _callPropertyCount,
    __in_opt const WS_ASYNC_CONTEXT* _asyncContext,
    __in_opt WS_ERROR* _error);

the LogonFlags parameter is a simple type...

      <s:element name="ValidateLogon">
        <s:complexType>
          <s:sequence>
            <s:element minOccurs="0" maxOccurs="1" name="sCurrentSessionID" type="s:string" />
            <s:element minOccurs="1" maxOccurs="1" name="LogonFlags" type="tns:LogonType" />
          </s:sequence>
        </s:complexType>
      </s:element>
      <s:simpleType name="LogonType">
        <s:list>
          <s:simpleType>
            <s:restriction base="s:string">
              <s:enumeration value="ClientSideSSL" />
              <s:enumeration value="GoodPassword" />
              <s:enumeration value="OkPassword" />
              <s:enumeration value="NoPassword" />
              <s:enumeration value="Guest" />
              <s:enumeration value="UnknownORFlag6" />
              <s:enumeration value="UnknownORFlag7" />
              <s:enumeration value="UnknownORFlag8" />
              <s:enumeration value="UnknownORFlag9" />
              <s:enumeration value="UnknownORFlag10" />
              <s:enumeration value="UnknownORFlag11" />
              <s:enumeration value="UnknownORFlag12" />
              <s:enumeration value="UnknownORFlag13" />
              <s:enumeration value="UnknownORFlag14" />
              <s:enumeration value="UnknownORFlag15" />
              <s:enumeration value="UnknownORFlag16" />
              <s:enumeration value="TrustedConsumer" />
              <s:enumeration value="UnknownANDFlag2" />
              <s:enumeration value="UnknownANDFlag3" />
              <s:enumeration value="UnknownANDFlag4" />
              <s:enumeration value="UnknownANDFlag5" />
              <s:enumeration value="UnknownANDFlag6" />
              <s:enumeration value="UnknownANDFlag7" />
              <s:enumeration value="UnknownANDFlag8" />
              <s:enumeration value="UnknownANDFlag9" />
              <s:enumeration value="UnknownANDFlag10" />
              <s:enumeration value="UnknownANDFlag11" />
              <s:enumeration value="UnknownANDFlag12" />
              <s:enumeration value="UnknownANDFlag13" />
              <s:enumeration value="UnknownANDFlag14" />
            </s:restriction>
          </s:simpleType>
        </s:list>
      </s:simpleType>
      <s:element name="ValidateLogonResponse">
        <s:complexType>
          <s:sequence>
            <s:element minOccurs="1" maxOccurs="1" name="ValidateLogonResult" type="s:int" />
          </s:sequence>
        </s:complexType>
      </s:element>

I just can't find any examples of how to use these WS_XML_BUFFER's when the generated function 'falls back' to these types?
Any help appreciated.

Answer 1

Strange that it couldn't handle an enum. You can try WS_XML_WRITER/WsCreateWriter etc. to write to the buffer.

---

http://blog.voidnish.com

Answer 2

Any ideas on what the structure looks like for the xml?

Answer 3

Hi hegsie,

The root cause for the issue is the Flags attributes set for this enumeration type on the .Net side. You should see [Flags] attribute in the contract definition in your .Net code. The problem with this type is that C language does not have any good representation for this type. We have been thinking about several possible solutions, but at the end decided to just fallback to WS_XML_BUFFER type. In the message you can expect something like "<XML> ClientSideSSL GoodPassword UnknownANDFlag14 </XML>" or similar combination of values. You can get the string from the XML buffer using WsReadChars(), for example, and tokenize it to get the value out of it.

Regards,
Nikola

---

Nikola Dudar is the Program Manager for Windows Web Services API team. This post is provided "AS IS" with no warranties, and confer no rights. Use of any samples is subject to the terms specified at http://www.microsoft.com/ info/cpyright.htm

Answer 4

Nikola,

What are the issues if you ignore the Flags attribute and treat it as a normal enum when generating the native equivalent?

---

http://blog.voidnish.com

Answer 5

Cheers Nikola,

I'll give this a whirl tomorrow and let you know how I go..

Regards

hegsie

Answer 6

Hi,
So I tried to use the following but I'm still a bit perplexed about where I get the WS_XML_BUFFER from...

	WS_XML_BUFFER* xmlBuffer = NULL;
	WS_XML_WRITER* xmlWriter = NULL;
	WS_XML_READER* reader = NULL;

	WS_XML_STRING arrayElement = WS_XML_STRING_VALUE("XML");
	WS_XML_STRING emptyNamespace = WS_XML_STRING_VALUE("");

	WS_XML_WRITER_BUFFER_OUTPUT bufferOutput;
	ZeroMemory(&bufferOutput, sizeof(bufferOutput));
	bufferOutput.output.outputType = WS_XML_WRITER_OUTPUT_TYPE_BUFFER;

	WS_XML_WRITER_TEXT_ENCODING writerTextEncoding;
	ZeroMemory(&writerTextEncoding, sizeof(writerTextEncoding));
	writerTextEncoding.encoding.encodingType = WS_XML_WRITER_ENCODING_TYPE_TEXT;
	writerTextEncoding.charSet = WS_CHARSET_UTF8;

	// Create an XML writer
	hr = WsCreateWriter( NULL, 0, &xmlWriter, error);
	hr = WsSetOutput(xmlWriter, &writerTextEncoding.encoding, &bufferOutput.output, NULL, 0, error);
	hr = WsWriteStartElement(xmlWriter, NULL, &arrayElement, &emptyNamespace, error);
	// Create an XML reader
	hr = WsCreateReader( NULL, 0, &reader, error);

	hr = WsWriteChars(xmlWriter,L"GoodPassword",1,error);
	hr = WsWriteEndElement(xmlWriter, error);

	WS_BYTES buffer;
	hr = WsGetWriterProperty(xmlWriter, WS_XML_WRITER_PROPERTY_BYTES, &buffer, sizeof(buffer), error);

	// Read the xml into a WS_XML_BUFFER
	hr = WsReadXmlBuffer( reader, heap, &xmlBuffer, error);
	if (FAILED(hr))
	{
		// Print out the error
		PrintError(hr, error);
	}

	WS_HTTP_BINDING_TEMPLATE templ = {};
	hr = DLLogonSoap_CreateServiceProxy(&templ,NULL,0, &proxy,error);
	hr = WsOpenServiceProxy(proxy, &address, NULL, error);

	int result = 0;

	hr = DLLogonSoap_ValidateLogon(proxy,(WCHAR*)wLoginGUID.c_str(),xmlBuffer,&result,heap,NULL,0,NULL,error);

but the WsReadXmlBuffer always fails, is there another way to get the WS_XML_BUFFER or am I completely of track?

Answer 7

There is a sample in the SDK :

Windows\v7.0\Samples\Web\WWSAPI\XmlBuffer

which you may want to look at.

---

http://blog.voidnish.com

Answer 8

You guys rock, cheers for all the help...
hegsie

For the curious...

	// Some xml to read and write
	static const char xml[] = "<XML>GoodPassword</XML>";

	// Setup the reader input source
	WS_XML_READER_BUFFER_INPUT bufferInput;
	ZeroMemory( &bufferInput,  sizeof(bufferInput));
	bufferInput.input.inputType = WS_XML_READER_INPUT_TYPE_BUFFER;
	bufferInput.encodedData = (void*)xml;
	bufferInput.encodedDataSize = (ULONG)strlen(xml);

	WS_XML_READER_TEXT_ENCODING textEncoding;
	ZeroMemory( &textEncoding,  sizeof(textEncoding));

	textEncoding.encoding.encodingType = WS_XML_READER_ENCODING_TYPE_TEXT;
	textEncoding.charSet = WS_CHARSET_AUTO;
	WS_XML_READER* reader = NULL;
	WS_XML_BUFFER* buffer = NULL;

	// Create an XML reader
	hr = WsCreateReader(NULL,0, &reader, error);

	hr = WsSetInput( reader, &textEncoding.encoding, &bufferInput.input, NULL, 0, error);

	// Read the xml into a WS_XML_BUFFER
	hr = WsReadXmlBuffer(reader, heap, &buffer, error);

	WS_HTTP_BINDING_TEMPLATE templ = {};
	hr = DLLogonSoap_CreateServiceProxy(&templ,NULL,0, &proxy,error);
	hr = WsOpenServiceProxy(proxy, &address, NULL, error);

	int result = 0;

	std::wstring wLoginGUID = ConvertCharToWstring(mLoginGUID.c_str());
	hr = DLLogonSoap_ValidateLogon(proxy,(WCHAR*)wLoginGUID.c_str(),buffer,&result,heap,NULL,0,NULL,error);

	if (!FAILED(hr) && result > 0) // result contains the accountid 
		guidValid = true;