tailieunhanh - extremetech Hacking BlackBerry phần 10

hỗ trợ cho các phông chữ, định dạng hình ảnh, bố cục phức tạp, kích thước trang, lề, các điều kiện lỗi, và nhiều hơn nữa. Mặc dù những vấn đề vượt quá phạm vi của chương này, nó vẫn quản lý để chứng minh làm thế nào để hack cùng một khả năng in ấn cơ bản vào BlackBerry của bạn. | Chapter 15 Printing Your Notes Wirelessly 245 support for fonts image formats sophisticated layouts page sizes margins error conditions and more. Although these matters are beyond the scope of this chapter it still manages to demonstrate how to hack together a basic printing capability into your BlackBerry. BlackBerry-Controlled Functions In an effort to provide a measure of security on BlackBerry devices for users and wireless carriers Research In Motion controls access to functions available to developers in the BlackBerry SDK. Any function can be called from a program within the BlackBerry Simulator but when it comes to running a program on an actual BlackBerry device certain families of functions are controlled for security purposes. This means that any application program that uses a protected function must be digitally signed before being loaded onto a device. Now as luck would have it if you are anxious to print among the functions protected by RIM are those that enable direct Bluetooth communications. Accordingly because you will be using these functions in this chapter it is necessary to talk briefly about the signing process and how you go about obtaining a digital signature for your program. Why Require a Digital Signature Of course any obstacle that gets in the way of writing code results in a predictable chorus of groans whining and complaining from developers who simply don t want to be bothered. While a part of me is happy to add my own whiny voice to this chorus the rest of me recognizes that the idea of keeping BlackBerry devices and the wireless networks they operate on safe is a pretty good one. It is also important to note that code signing isn t necessarily about having Big Brother look over your shoulder as your write your BlackBerry program. Rather it s about assuring BlackBerry customers who download your program onto their device that they are really downloading what they think they are downloading. Without code signing a malicious person .

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