CPop 构造函数

 CONSTRUCTOR(
	cServer,
	cUserName,
	cPassword,
	nPort,
	oEMailStorage
) CLIPPER

[ClipperCallingConventionAttribute(new string[] { ... })]
public CPop(
	__Usual cServer = default,
	__Usual cUserName = default,
	__Usual cPassword = default,
	__Usual nPort = default,
	__Usual oEMailStorage = default
)