explain how the distributed operating system is helpful for now a days
Programming the Be Operating System-Chapter 9: Messages and Threads
... function AddData().AddData() can be used to add data of any type to a message. Thus, AddData()can be used to add data of an application-defined type, or data of any of the typesthat can be added ... of a Find function, while data holds the data itself.Unlike most Add functions, though, in AddData() the data parameter is a pointerto the data rather than the data itself.Because AddData() ... applicationmessage with which you’re familiar. The Application Kit and Messages 325Because an application is multithreaded, more than one thread may attempt toaccess the same data. For read-only data (data...
- 37
- 541
- 0
Programming the Be Operating System-Chapter 10: Files
... that file. The err variable is againpresent for use in error checking. Gone are the BPath variable path, the BEntryvariable entry, and the FILE variable f. The above code is unchanged from the ... to the user’s dismissal of the panel. The default target is the application object, which works well for the Open filepanel. That’s because the Open file panel affects the application, and is ... item displays the Open file panel, but selecting a file from the panel’s list has no effect the panel is simply dismissed. The Save As menu itemdisplays the Save file panel, but typing a name and...
- 18
- 405
- 1
Tài liệu Programming the Be Operating System-Chapter 1: BeOS Programming Overview ppt
... program toanother falls on the operating system rather than on running applications. The advantage is that no one program can grab and retain control of system resources.If you haven’t already ... system! Multithreaded A thread is a path of execution a part of a program that acts independently fromother parts of the program, yet is still capable of sharing data with the rest of pro-gram. An OS that is ... message, and is received by anapplication in its main thread. A message is itself an object a parcel of data thatholds details about the action being reported. The ability of the operating system to...
- 30
- 460
- 0
Tài liệu Programming the Be Operating System-Chapter 2: BeIDE Projects docx
... can forego a user interface and run in the background only. Ifan application is marked as a background app, it behaves in this way andwon’t be named in the Deskbar.Argv OnlyAn application can ... type ‘APPI’ (for “application information”) in the applica-tion. An ‘APPI’ resource consists of the following pieces of information about anapplication:Launch Behavior The launch characteristics ... optionally,provide a name for the view (NULL can be passed as the second parameter). If a window is to have only a single view, then the first parameter to the constructor is a rectangle of the same...
- 44
- 412
- 0
Tài liệu Programming the Be Operating System-Chapter 3: BeOS API Overview doc
... classes for the common interface elements. There’s the BWindow class for a window, the BMenuBar class for a menubar, the BMenu class for a menu, the BMenuItem class for a menu item, and so forth. ... program must create an instance of the BApplication classand then invoke Run() to start the program. The BApplication class is derived from two other Application Kit classes—BLooper and BHandler.ABLooper ... include analert. Armed with the above knowledge, it’s a pretty safe guess that the InterfaceKit defines a BAlert class to ease the task of creating alerts. The BAlert class description The BAlert...
- 23
- 449
- 0
Tài liệu Programming the Be Operating System-Chapter 4: Windows, Views, and Messages doc
... many bytes are in the array that is the first parameter. As with all hook functions, the values of these parameters are filledin by the system and are available in your implementation of the hook ... application, you can add to the class definition a private data member of the window class type. Consider a program that displaystwo windows: an input window for entering a mathematical equation, ... *fMyWindow;};Storing a window object in the data memberIn past examples, I created an instance of a window by declaring a local windowvariable in the application constructor, then using that variable in a call...
- 36
- 411
- 0
Tài liệu Programming the Be Operating System-Chapter 5: Drawing ppt
... to act like a basic datatype rather than a class. The declaration of a BPoint is all that’s needed to actually create a BPoint object. 154 Chapter 5: DrawingPattern example project The Pattern ... of the arrangement of the pixelsthat make up the pattern, it can be used to fill an area of any size. And regardlessof the size or shape of an area, once a pattern is defined it can be easily ... the Pattern program’s win-dow. Also shown is the Magnify program’s window as it displays an enlarged viewof some of the pixels in the Pattern program’s filled rectangle.As is the case for many...
- 43
- 459
- 0
Tài liệu Programming the Be Operating System-Chapter 6: Controls and Messages ppt
... fMyView->AddChild(fButtonBeep2); Show();}Handling button clicksMessageReceived() always has a similar format. The Application Server passesthis function a message as an argument. The message data ... controlconsisting of a static string on the left and an editable text area on the right. The static text acts as a label that provides the user with information aboutwhat is to be typed in the editable ... projectWhat if I do want my RadioButtonGroup program to frame the radio buttons, andto do so in a way that automatically updates the frame as needed? Instead of plac-ing the radio buttons in a generic...
- 49
- 383
- 0
Tài liệu Programming the Be Operating System-Chapter 7: Menus docx
... name“Visual.” Recall that the source of the menu’s name is the name parameter of the BPopUpMenu object. The BMenuField name parameter serves as a name for the BMenuField view, and isn’t displayed ... new code that adds a separator item to the Visual menu and creates and initializes the Number of Shapes submenu that’s now housed as the last item in the Visual menu. Here’s a part of the MyHelloWindow ... 7.Menus are the interface between the user and the program, and are the primarymeans by which a user carries out tasks. A Be program that makes use of menususually places a menubar along the top...
- 46
- 390
- 0
Tài liệu Programming the Be Operating System-Chapter 8: Text ppt
... memberfunction that returns the same trait. An examination of a few of these font charac-teristics provides a basis for understanding how fonts are manipulated.Font sizeAn example of setting a BFont ... fTextView->SetStylable(true);}ScrollingText or graphics your application uses may not always fit within the confines of a view. Enter the scrollbar. The APIs for other operating systems that employ a graphical user interface include ... value from GetFontAndColor() ,is altered by the call to SetSize(), and then is passed back to the theTextViewobject by a call to SetFontAndColor(). The process is not, however, the same for the...
- 50
- 345
- 0
Learning the Unix Operating System pptx
... argument can be an option or a filename. The general format for UNIX commands is: command option(s) filename(s)There isn't a single set of rules for writing UNIX commands and arguments, ... commands have commands of their own. (For examples, look at the more, mail, and pg commands in Chapter 3. Text editors like vi and emacs also have their own commands.) Once you start the command, ... lines can be simple, one-word entries like the date command. They can also be more complex: you may need to type more than the command name. A UNIX command may or may not have arguments. An argument...
- 114
- 462
- 0
oracle database quick installation guide 10g release 1 (10.1.0.3) for the solaris operating system (x86)
... Configuration Assistants screen displays status information for the configuration assistants that configure the software and create a database.After the Database Configuration Assistant finishes, ... Install the Oracle Database 10g software on a local file system ■ Configure a general-purpose Oracle database that uses the local file system for database file storage■ Install software from the ... 10g:■ The database that you created and the default Oracle Net lis-tener process are running on the system ■ Oracle Enterprise Manager Database Control and iSQL*Plus are running and can be accessed...
- 48
- 439
- 0
labels and event processes in the asbestos operating system
... Clearance Labels. Each process has two labels, a trackinglabel and a clearance label. The tracking label records the information flow a process has observed so far; the clearance label bounds the ... pickles and tags, and is an instance of a general tag mappinginterface available for other uses. The mapping table’s interface was designedto be free of covert channels. For example, the table maps ... similargoals with a unified namespace for both confidentiality and integrity, and withprincipals that are not hierarchically related and that can be created at anytime. As a programming language...
- 43
- 1,168
- 0
Tìm thêm: hệ việt nam nhật bản và sức hấp dẫn của tiếng nhật tại việt nam xác định các mục tiêu của chương trình khảo sát các chuẩn giảng dạy tiếng nhật từ góc độ lí thuyết và thực tiễn khảo sát chương trình đào tạo của các đơn vị đào tạo tại nhật bản khảo sát chương trình đào tạo gắn với các giáo trình cụ thể tiến hành xây dựng chương trình đào tạo dành cho đối tượng không chuyên ngữ tại việt nam điều tra đối với đối tượng giảng viên và đối tượng quản lí điều tra với đối tượng sinh viên học tiếng nhật không chuyên ngữ1 khảo sát các chương trình đào tạo theo những bộ giáo trình tiêu biểu phát huy những thành tựu công nghệ mới nhất được áp dụng vào công tác dạy và học ngoại ngữ mở máy động cơ lồng sóc mở máy động cơ rôto dây quấn các đặc tính của động cơ điện không đồng bộ đặc tuyến hiệu suất h fi p2 đặc tuyến tốc độ rôto n fi p2 đặc tuyến dòng điện stato i1 fi p2 động cơ điện không đồng bộ một pha phần 3 giới thiệu nguyên liệu từ bảng 3 1 ta thấy ngoài hai thành phần chủ yếu và chiếm tỷ lệ cao nhất là tinh bột và cacbonhydrat trong hạt gạo tẻ còn chứa đường cellulose hemicellulose chỉ tiêu chất lượng theo chất lượng phẩm chất sản phẩm khô từ gạo của bộ y tế năm 2008