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man page of FBB::OneKey

FBB::OneKey: Single keystroke input, not requiring `Return'


FBB::OneKey - Single keystroke input, not requiring 'Return'


#include <bobcat/onekey> Linking option: -lbobcat


OneKey objects may be used to realize 'direct keyboard input': a pressed key becomes available without the need for pressing Enter. The characters are obtained from the standard input stream. Direct key entry remains in effect for as long as the OneKey object exists. Once the object is destroyed the standard input stream will return to its default mode of operation, in which input is 'confirmed' by a newline character.
FBB All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB.


The OneKey::Mode enumeration is used to control echoing of returned characters. It has two values: o OFF: returned characters are not echoed to the standard output stream; o ON: returned characters are echoed to the standard output stream.


o OneKey(OneKey::Mode state = OneKey::OFF): This constructor initializes the OneKey input object. By default, entered characters are not echoed. By constructing the object with the OneKey::ON argument, entered characters are echoed to the standard output stream. This construct throws an Errno exception if it not properly complete. The constructor may fail for the following reasons: o the standard input stream is not a tty (e.g., when the standard input stream is redirected to a file); o the current state of the standard input stream can't be determined; o the standard input stream's state can't be changed to the 'direct keyboard input' mode. The copy constructor (and the overloaded assignement operator) are not available.


o int get() const: Returns the next character from the standard input stream, without the need for pressing Enter. o void setEcho(OneKey::Mode state): Changes the echo-state of the OneKey object. The argument may be either OneKey::ON or OneKey::OFF. o void verify() const: Obsoleted, will be removed in a future Bobcat release.


/* driver.cc */ #include <iostream> #include <string> #include <bobcat/onekey> using namespace std; using namespace FBB; int main() { try { OneKey onekey; onekey.verify(); cout << "Usage: 1: next chars are echoed, 0: no echo, q: quits\n"; while (true) { char c; cout << "ready...\n"; cout << "Got character '" << (c = onekey.get()) << "'\n"; switch (c) { case '1': onekey.setEcho(OneKey::ON); break; case '0': onekey.setEcho(OneKey::OFF); break; case 'q': return 0; } } } catch (Errno const &e) { cout << e.why() << endl; return e.which(); } }
bobcat/onekey - defines the class interface


None Reported.


o bobcat_2.18.00-x.dsc: detached signature; o bobcat_2.18.00-x.tar.gz: source archive; o bobcat_2.18.00-x_i386.changes: change log; o libbobcat1_2.18.00-x_*.deb: debian package holding the libraries; o libbobcat1-dev_2.18.00-x_*.deb: debian package holding the libraries, headers and manual pages; o //sourceforge.net/projects/bobcat: public archive location;


Bobcat is an acronym of 'Brokken's Own Base Classes And Templates'.


This is free software, distributed under the terms of the GNU General Public License (GPL).
Frank B. Brokken (f.b.brokken@rug.nl). FBB::ONEKEY(3)

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