Sets current codepage. The WIN32OLE.codepage is initialized according
to Encoding.default_internal. If Encoding.default_internal is nil then WIN32OLE.codepage is initialized
according to Encoding.default_external.
staticVALUEfole_s_set_code_page(VALUEself,VALUEvcp){UINTcp=RB_FIX2INT(vcp);set_ole_codepage(cp);/*
* Should this method return old codepage?
*/returnQnil;}