How to access methods and properties in java-script class from DART
Not sure if its a compiler limitation or something I don't understand (likely the last :-))
I'm trying to access a "DataView" structure buried in an native java-script class.
I got it to work in debug mode; however, when compiled for deployment, the solution isn't working.
await _transferIn(adapter, 5, 64).then((usbInTransferResult)
log.finest('_transferIn.then');
js.context['console'].callMethod('log', [usbInTransferResult]);
var rxLen = usbInTransferResult['data']['byteLength']; <<<<< Fails
for( var index = 0; index < rxLen; index++ )
rxData.add(usbInTransferResult['data'].callMethod('getUint8', [index])); <<<<< Fails
;
log.finest(rxData);
return completer.complete(rxData);
);
The above code reads a data packet received through USB (WebUSB). It reads the received package length and puts it copies each byte into a List<int>. In both places (reading the property byteLength and calling method getUint8([index]) fails only when compiled for deployment.
Below a picture of the reported error
Below a picture of a successful run (in debug mode)
Please notice the additional DART symbols (which are missing in the picture above).
ps.
I'm using DART-SDK 2.0.0 (tried also 2.1.0-dev.8.0), and Angular-DART 5.0.0, within a WebStorm project.
dart angular-dart dart-js-interop webusb dart-sdk
asked Nov 11 '18 at 21:07
Bas EBas E
414
add a comment |
Not sure if its a compiler limitation or something I don't understand (likely the last :-))
I'm trying to access a "DataView" structure buried in an native java-script class.
I got it to work in debug mode; however, when compiled for deployment, the solution isn't working.
await _transferIn(adapter, 5, 64).then((usbInTransferResult)
log.finest('_transferIn.then');
js.context['console'].callMethod('log', [usbInTransferResult]);
var rxLen = usbInTransferResult['data']['byteLength']; <<<<< Fails
for( var index = 0; index < rxLen; index++ )
rxData.add(usbInTransferResult['data'].callMethod('getUint8', [index])); <<<<< Fails
;
log.finest(rxData);
return completer.complete(rxData);
);
The above code reads a data packet received through USB (WebUSB). It reads the received package length and puts it copies each byte into a List<int>. In both places (reading the property byteLength and calling method getUint8([index]) fails only when compiled for deployment.
Below a picture of the reported error
Below a picture of a successful run (in debug mode)
Please notice the additional DART symbols (which are missing in the picture above).
ps.
I'm using DART-SDK 2.0.0 (tried also 2.1.0-dev.8.0), and Angular-DART 5.0.0, within a WebStorm project.
dart angular-dart dart-js-interop webusb dart-sdk
asked Nov 11 '18 at 21:07
Bas EBas E
414
I think you meant to say "javascript" instead of "java" above.
– Nate Bosch
Nov 13 '18 at 19:20
add a comment |
Not sure if its a compiler limitation or something I don't understand (likely the last :-))
I'm trying to access a "DataView" structure buried in an native java-script class.
I got it to work in debug mode; however, when compiled for deployment, the solution isn't working.
await _transferIn(adapter, 5, 64).then((usbInTransferResult)
log.finest('_transferIn.then');
js.context['console'].callMethod('log', [usbInTransferResult]);
var rxLen = usbInTransferResult['data']['byteLength']; <<<<< Fails
for( var index = 0; index < rxLen; index++ )
rxData.add(usbInTransferResult['data'].callMethod('getUint8', [index])); <<<<< Fails
;
log.finest(rxData);
return completer.complete(rxData);
);
The above code reads a data packet received through USB (WebUSB). It reads the received package length and puts it copies each byte into a List<int>. In both places (reading the property byteLength and calling method getUint8([index]) fails only when compiled for deployment.
Below a picture of the reported error
Below a picture of a successful run (in debug mode)
Please notice the additional DART symbols (which are missing in the picture above).
ps.
I'm using DART-SDK 2.0.0 (tried also 2.1.0-dev.8.0), and Angular-DART 5.0.0, within a WebStorm project.
dart angular-dart dart-js-interop webusb dart-sdk
asked Nov 11 '18 at 21:07
Bas EBas E
414
Not sure if its a compiler limitation or something I don't understand (likely the last :-))
I'm trying to access a "DataView" structure buried in an native java-script class.
I got it to work in debug mode; however, when compiled for deployment, the solution isn't working.
await _transferIn(adapter, 5, 64).then((usbInTransferResult)
log.finest('_transferIn.then');
js.context['console'].callMethod('log', [usbInTransferResult]);
var rxLen = usbInTransferResult['data']['byteLength']; <<<<< Fails
for( var index = 0; index < rxLen; index++ )
rxData.add(usbInTransferResult['data'].callMethod('getUint8', [index])); <<<<< Fails
;
log.finest(rxData);
return completer.complete(rxData);
);
The above code reads a data packet received through USB (WebUSB). It reads the received package length and puts it copies each byte into a List<int>. In both places (reading the property byteLength and calling method getUint8([index]) fails only when compiled for deployment.
Below a picture of the reported error
Below a picture of a successful run (in debug mode)
Please notice the additional DART symbols (which are missing in the picture above).
ps.
I'm using DART-SDK 2.0.0 (tried also 2.1.0-dev.8.0), and Angular-DART 5.0.0, within a WebStorm project.
dart angular-dart dart-js-interop webusb dart-sdk
dart angular-dart dart-js-interop webusb dart-sdk
asked Nov 11 '18 at 21:07
Bas EBas E
414
asked Nov 11 '18 at 21:07
Bas EBas E
414
edited Nov 13 '18 at 19:33
Bas E
asked Nov 11 '18 at 21:07
Bas EBas E
414
asked Nov 11 '18 at 21:07
Bas EBas E
414
asked Nov 11 '18 at 21:07
Bas EBas E
414
414
I think you meant to say "javascript" instead of "java" above.
– Nate Bosch
Nov 13 '18 at 19:20
add a comment |
I think you meant to say "javascript" instead of "java" above.
– Nate Bosch
Nov 13 '18 at 19:20
I think you meant to say "javascript" instead of "java" above.
– Nate Bosch
Nov 13 '18 at 19:20
I think you meant to say "javascript" instead of "java" above.
– Nate Bosch
Nov 13 '18 at 19:20
add a comment |
1 Answer
1
active
oldest
votes
See the js package and it's documentation for how to wrap a javascript API with something callable from Dart.
answered Nov 13 '18 at 19:21
Nate BoschNate Bosch
93649
Hi Nate.Thanks for the feedback. As I'm struggling a bit maybe you can point a bit further. The challenge I'm facing is with a structure passed to DART through a callback (It seems js package addresses the other-way around from DART -> JS). Please also remember, the solution works in debug mode, but fails when deployed.
– Bas E
Nov 13 '18 at 22:48
add a comment |
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1 Answer
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active
oldest
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oldest
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oldest
votes
See the js package and it's documentation for how to wrap a javascript API with something callable from Dart.
answered Nov 13 '18 at 19:21
Nate BoschNate Bosch
93649
Hi Nate.Thanks for the feedback. As I'm struggling a bit maybe you can point a bit further. The challenge I'm facing is with a structure passed to DART through a callback (It seems js package addresses the other-way around from DART -> JS). Please also remember, the solution works in debug mode, but fails when deployed.
– Bas E
Nov 13 '18 at 22:48
add a comment |
See the js package and it's documentation for how to wrap a javascript API with something callable from Dart.
answered Nov 13 '18 at 19:21
Nate BoschNate Bosch
93649
Hi Nate.Thanks for the feedback. As I'm struggling a bit maybe you can point a bit further. The challenge I'm facing is with a structure passed to DART through a callback (It seems js package addresses the other-way around from DART -> JS). Please also remember, the solution works in debug mode, but fails when deployed.
– Bas E
Nov 13 '18 at 22:48
add a comment |
See the js package and it's documentation for how to wrap a javascript API with something callable from Dart.
answered Nov 13 '18 at 19:21
Nate BoschNate Bosch
93649
See the js package and it's documentation for how to wrap a javascript API with something callable from Dart.
answered Nov 13 '18 at 19:21
Nate BoschNate Bosch
93649
answered Nov 13 '18 at 19:21
Nate BoschNate Bosch
93649
answered Nov 13 '18 at 19:21
Nate BoschNate Bosch
93649
answered Nov 13 '18 at 19:21
Nate BoschNate Bosch
93649
93649
Hi Nate.Thanks for the feedback. As I'm struggling a bit maybe you can point a bit further. The challenge I'm facing is with a structure passed to DART through a callback (It seems js package addresses the other-way around from DART -> JS). Please also remember, the solution works in debug mode, but fails when deployed.
– Bas E
Nov 13 '18 at 22:48
add a comment |
Hi Nate.Thanks for the feedback. As I'm struggling a bit maybe you can point a bit further. The challenge I'm facing is with a structure passed to DART through a callback (It seems js package addresses the other-way around from DART -> JS). Please also remember, the solution works in debug mode, but fails when deployed.
– Bas E
Nov 13 '18 at 22:48
Hi Nate.Thanks for the feedback. As I'm struggling a bit maybe you can point a bit further. The challenge I'm facing is with a structure passed to DART through a callback (It seems js package addresses the other-way around from DART -> JS). Please also remember, the solution works in debug mode, but fails when deployed.
– Bas E
Nov 13 '18 at 22:48
Hi Nate.Thanks for the feedback. As I'm struggling a bit maybe you can point a bit further. The challenge I'm facing is with a structure passed to DART through a callback (It seems js package addresses the other-way around from DART -> JS). Please also remember, the solution works in debug mode, but fails when deployed.
– Bas E
Nov 13 '18 at 22:48
add a comment |
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I think you meant to say "javascript" instead of "java" above.
– Nate Bosch
Nov 13 '18 at 19:20