By Mark Summerfield
Master Qt's strongest APIs, styles, and improvement Practices
Qt has advanced right into a remarkably robust resolution for cross-platform laptop, net, and cellular improvement. even if, even the main skilled Qt programmers purely use a fragment of its functions. furthermore, useful information regarding Qt's latest positive factors has been scarce—until now.
Advanced Qt Programming indicates builders precisely the right way to take complete good thing about Qt 4.5's and Qt 4.6's most precious new APIs, software styles, and improvement practices. Authored via Qt professional Mark Summerfield, this e-book concentrates on ideas that provide the main strength and suppleness with the least additional complexity.
Summerfield focuses particularly on model/view and graphics/view programming, hybrid desktop/Web purposes, threading, and purposes incorporating media and wealthy textual content. all through, he provides sensible, downloadable code examples, all confirmed on home windows, Mac OS X, and Linux utilizing Qt 4.6 (and so much confirmed on Qt 4.5) and designed to expect destiny types of Qt. The book
Walks via utilizing Qt with WebKit to create cutting edge hybrid desktop/Internet applications
Shows how one can use the Phonon framework to construct strong multimedia applications
Presents state of the art options for utilizing model/view desk and tree types, QStandardItemModels, delegates, and perspectives, and for growing customized desk and tree versions, delegates, and views
Explains how you can write greater threaded courses with the QtConcurrent module and with the QThread class
Includes targeted insurance of constructing wealthy textual content editors and documents
Thoroughly covers graphics/view programming: structure, home windows, widgets, layouts, scenes, and more
Introduces Qt 4.6's strong animation and nation computer frameworks
Read Online or Download Advanced Qt Programming: Creating Great Software with C++ and Qt 4 PDF
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Additional info for Advanced Qt Programming: Creating Great Software with C++ and Qt 4
In line 12, we look up the distinguished name of the entry that has a certain email address using the search( ) method and our filter. When we have found an entry, we try to connect to the LDAP server again using the password belonging to the entry we have just found. If this works, everything is fine, and the user can be authenticated. ' end With only thirty lines of client code, we have implemented a complete LDAP authentication mechanism that can be used with a single line of code. To make this authentication system as secure as possible, we should use the Secure Sockets Layer (SSL) protocol or its successor, Transport Layer Security (TLS).
It will also consume twice as much processing time if you encrypt your message with the recipient’s public key, too. A much better solution would be not to use the whole message as a signature but only a digest (or fingerprint). In this case, the plaintext would be encrypted only once, and the signature would be very small. sign(digest, plaintext) The message is encrypted with Bob’s public key, and in line 4, a signature is created by calling the private key’s sign( ) method. sign( ) expects two things: the digest to be used (SHA1 in our case) and the plaintext to create a signature for.
Otherwise, we call failed_login( ) and redirect to the login page after setting an error message. Com 8. 4: Authenticate the test application at myOpenID. That’s it! With a few lines of code, our application supports two convenient and secure authentication mechanisms. There’s really no excuse for not offering both of them. Com Recipe 9 Authenticate with LDAP Problem A lot of companies use the Lightweight Directory Access Protocol (LDAP) for storing user account information, and in this recipe you’ll learn how to access a LDAP repository from your Rails application to authenticate user information.