Hi, I'm a coursera's ChucK course student, in the lectures, Ge used HIDs to
handle keyboard input, so this snippet should help (I'm commenting the code
for clarity).
// HID stands for human-interface-device, also this is an event,
// see below for more info
Hid hid;
// This is a message, this will hold the event's (keypress) information.
HidMsg msg;
// We should define a device number since we would have multiple keyboards
// attached to our computer, 0 would do on most cases but you can try 1, or
2
// if that doesn't work.
0 => int device_number;
// We check if the device attach with ChucK was successful, otherwise the
program
// would end inmediately
if(!hid.openKeyboard(device_number)) me.exit();
<<<"Keyboard:", hid.name(), " ready!">>>;
// We setup a simple sound chain for demonstration pruposes only
BeeThree organ => JCRev rev => dac;
.05 => rev.mix;
// And repeat forever, see how the keyboard input is something that would
happen
// *forever*, a keypress can occur anytime so we need to stay alert until a
new
// event comes in
while(true) {
// Events are things that happens sometime, in ChucK this mains
basically
// hold ourselves until the event appears (thats why we wain for the
event
// ChucKing it to now)
hid => now;
// When our wait finishes: check all the messages that came from the
keyboard
// using the recv function, and passing msg as the holder of the
information
while(hid.recv(msg)) {
// we check if the message is a buttondown message, in that case:
if(msg.isButtonDown()) {
// We show the ascii value of the key pressed
<<< "Button down:", msg.ascii >>>;
// and make our generator sound, see how we check if the
// frequency too much high we simply discard this message
msg.ascii => Std.mtof => float freq;
if(freq > 20000) continue;
freq => organ.freq;
1 => organ.noteOn;
// this will make sure the sound will keep for a minimum amount
of
// time, otherwise, concurrent events may stop before even
commencing
80::ms => now;
} else {
// If we're not in a buttondown event, just assume it's a key
has been
// left out and shut down the sound.
<<< "Button up:", msg.ascii >>>;
1 => organ.noteOff;
}
}
}
2013/12/5 Manuel Bärenz
Hi Julien,
No, this is not the case. KBHits are only key down events. I tried to include several kb => now, but it didn't help. See also this example here: http://chuck.cs.princeton.edu/doc/examples/event/kb2.ck Apparently, the solution is emptying the event queue by calling kb.getchar() until kb.more() returns false:
KBHit kb;
me.sourceDir() + "/bum.wav" => string filename;
adc => WvOut b => blackhole; filename => b.wavFilename; kb => now; while(kb.more()) kb.getchar();
b.closeFile();
SndBuf buf => dac; filename => buf.read; kb => now;
The important line is "while(kb.more()) kb.getchar();", apparently. So I guess kb => now; doesn't wait at all if there are still unprocessed keys in the queue.
Best, Manuel
Am 05/12/13 12:18, schrieb Julien Saint-Martin:
Hi Manuel,
Maybe your problem is as follow: For each key press there is two kb events: key down and key up.
A simple solution maybe to write "kb => now;" twice.
Cheers, Julien
2013/12/5 Manuel Bärenz
Hello again,
I also wanted to demonstrate a simple sequencer prototype that lets me record a file and then plays it back to me. I've come this far:
KBHit kb;
me.sourceDir() + "/bum.wav" => string filename;
adc => WvOut b => blackhole; filename => b.wavFilename; kb => now; b.closeFile();
SndBuf buf => dac; filename => buf.read; kb => now;
But strangely, the program doesn't wait for the second kb event, but exits directly after the first key that I hit. Any ideas what I'm doing wrong?
Best, Manuel _______________________________________________ chuck-users mailing list chuck-users@lists.cs.princeton.edu https://lists.cs.princeton.edu/mailman/listinfo/chuck-users
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