Index_E

E

e-mail messages, sending, 423

E_FAIL, returning, 235

ECBs (extension control blocks)

role in overriding HTTP transport, 396

role in Passport Manager, 360

ECBs for requests , retrieving pointers to, 469

else statements, using for flow control, 2325

emitidl attribute, example of, 36

emitidl COM attribute, description of, 290

encoding schemes for MIME attachments, types of, 428

encryption

overview of, 464465

using customizations with SOAP, 474475

enums

sample code for, 338340

support for, 337344

using with Web services, 140141, 294295

error checking

performing while processing responses, 336337

as security best practice, 457458

error handling, performing for Web services, 155157

error information, retrieving from IErrorInfo, 312

error messages for input headers, generating, 143

Exchange methods , using, 7476

exclamation point (!) syntax, explanation of, 261

export attribute

using with enums, 141

using with enums and Web services, 294295

using with structs, 138