Yoctopuce Yocto-Demo Mode D'emploi page 78

13. Utilisation du Yocto-Demo en Delphi
SysUtils,
yocto_api,
yocto_led;
Procedure Usage();
var
exe : string;
begin
exe:= ExtractFileName(paramstr(0));
WriteLn(exe+'
WriteLn(exe+'
WriteLn(exe+'
halt;
End;
procedure setLedState(led:TYLed; state:boolean);
begin
if (led.isOnline()) then
begin
if state then led.set_power(Y_POWER_ON)
else
end
else Writeln('Module not connected (check identification and USB
end;
var
c : char;
led : TYLed;
errmsg : string;
begin
// Setup the API to use local USB devices
if yRegisterHub('usb', errmsg)<>YAPI_SUCCESS
begin
Write('RegisterHub error:
exit;
end;
if paramstr(1)='any'
begin
// use the first available led
led := yFirstLed();
if led=nil then
begin
writeln('No module connected (check USB
halt;
end
end
else // or use the one specified on the command line
led:= YFindLed(paramstr(1)+'.led');
// make sure it is connected
if not(led.isOnline()) then
begin
Writeln('Module not connected (check identification and USB
halt;
end;
// minimalist UI
Writeln('0: turn test led
Writeln('1: turn test led
Writeln('x: exit');
repeat
read(c);
case c of
'0' : setLedState(led,false);
'1' : setLedState(led,true);
end;
until c='x';
end.
Il n'y a que peu de lignes véritablement importantes dans le code précédent. Nous allons les
expliquer en détail.
72
<serial_number>');
<logical_name>');
any');
led.set_power(Y_POWER_OFF);
'+errmsg);
then
OFF');
ON');
then
cable)');
cable)');
cable)');
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