Assuming you get the WSDL, then you can use pretty much any one of the handful of SOAP implementations out there that support VC++.
Available products include (not an exhaustive list):
PocketSOAP (www.pocketsoap.com <http://www.pocketsoap.com/>)
WhiteMesa (www.whitemesa.com <http://www.whitemesa.com/>)
Systinet Server for C++ (www.systinet.com <http://www.systinet.com/>)
SQLData (www.sqldata.com <http://www.sqldata.com/>)
Microsoft SOAP Toolkit (http://www.microsoft.com/downloads/details.aspx?FamilyID=c943c0dd-ceec-4088-9753-86f052ec8450&displaylang=en <http://www.microsoft.com/downloads/details.aspx?FamilyID=c943c0dd-ceec-4088-9753-86f052ec8450&displaylang=en>)
Also gSoap (http://sourceforge.net/projects/gsoap2/), free , extremely small, and works.
