Download An Introduction to Design Patterns in C++ with Qt 4 by Alan Ezust PDF

By Alan Ezust

Learn C++, styles, and Qt four Cross-Platform Development

Master C++ and layout styles jointly, utilizing the world's top open resource framework for cross-platform improvement: Qt four.

An creation to layout styles in C++ with Qt four is a whole instructional and reference that assumes no earlier wisdom of C, C++, items, or styles. you will stroll via each center inspiration, one step at a time, studying via an intensive choice of Qt 4.1-tested examples and routines.

By the time you are performed, you can be developing multithreaded GUI purposes that entry databases and manage XML files--applications that run on structures together with home windows, Linux, Unix, and Mac OS X. better of all, you may be writing code that is effective, reusable, and chic.

  • Learn items speedy: sessions, inheritance, polymorphism, and more
  • Master strong layout styles
  • Discover effective high-level programming thoughts utilizing libraries, generics, and containers
  • Build graphical purposes utilizing Qt widgets, types, and views
  • Learn complex suggestions starting from multithreading to reflective programming
  • Use Qt's integrated periods for gaining access to MySQL data
  • Includes an entire C++ language reference

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16, we will create some strings from numerics and write them to a file. 16. cpp [ . . str(); cout << strval; /* An output file stream. close(); <-- 1 <-- 2 (1)convert the stringstream to a string (2)creates (or overwrites) a disk file for output After the strings have been written, we have a couple of choices for how to read them. 17. 17. cpp [ . . = lucky2) cerr << "ERROR! = pi) cerr << "ERROR! 18. 18. cpp [ . . 16 so that it does the following: It gets the file name from the user as an STL string fileName.

C_str() to convert the string to a form that is acceptable to the open( ) function. It makes sure that the file specified by the user does not already exist (or that it is all right to overwrite it if it does exist) before opening it for output. It makes sure that the file exists before attempting to read from it. 11. " const can be applied usefully in a large number of programming situations, as we will soon see. Because it cannot be assigned to, a const object must be properly initialized. For example: const int x = 33; const int v[] = {3, 6, x, 2 * x}; Working with the declarations above: ++x ; v[2] = 44; // error // error Compilers can take advantage of an object being read-only in various ways.

Since every value has a type, every literal has a type also. It is possible to have literals of each of the native data types, as well as character string literals. 1 shows some examples of literals. 1. 0L l or L specifies long double if it comes after a floating point '5' achar literal (ASCII 53) "50" aconst char* containing the chars '5','0', and '\0' "any" "body" "anybody" '\a' alert '\\' backslash '\b' backspace '\r' carriage return '\" single quote '\"' double quote '\f' formfeed (newpage) '\t' tab '\n' newlinechar literal "\n" newline followed by null terminator (const char*) '\0' null character '\v' vertical tab "a string with newline\n" anotherconst char* String literals are special in C++, due to its historical roots in the C language.

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