`Count must be in the range` on Windows about flutter_libserialport HOT 11 OPEN

Yes, it indicates an error but the last error is not set so it slips through. There was a reason to add that check so I'm sceptic to blindly change it. However, clamping the -2 length to 0 length would give and empty list, to make it a no-op.

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Yes, it indicates an error but the last error is not set so it slips through. There was a reason to add that check so I'm sceptic to blindly change it. However, clamping the -2 length to 0 length would give and empty list, to make it a no-op.

So do you consider this a bug that needs resolving? I'm asking this because initially, we viewed this as our own bad implementation, can we provide any extra data that helps you move forward with this bug or offer a workaround?

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Do you have any code snippet to show? Where does the error come from? Does it show any stacktrace?

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I cloned this repo and modified example/main.dart like this:

void initPorts() {
  setState(() => availablePorts = SerialPort.availablePorts);

  final serial = SerialPort('COM1');

  if (serial.openReadWrite()) {
    final reader = SerialPortReader(serial);
    reader.stream.listen((event) {
      print(event);
    });

    serial.write(Uint8List.fromList([1, 2, 3, 4]));
  }
}

Stacktrace is null. But i have attached a screenshot:

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@jpnurmi
Any comment/progress on this? we are facing the same issue here. would appreciate it if you help us navigate through the issue.

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I'm not sure why the library returns an error without providing the last error. Nevertheless, a sanity check like this could help. Are you able to test it for me? I don't have a suitable environment...

diff --git a/lib/src/util.dart b/lib/src/util.dart
index 2ca44c5..b0e2ddf 100644
--- a/lib/src/util.dart
+++ b/lib/src/util.dart
@@ -44,7 +44,7 @@ class Util {
   static Uint8List read(int bytes, UtilFunc<ffi.Uint8> readFunc) {
     final ptr = ffi.calloc<ffi.Uint8>(bytes);
     final len = call(() => readFunc(ptr));
-    final res = Uint8List.fromList(ptr.asTypedList(len));
+    final res = Uint8List.fromList(ptr.asTypedList(len.clamp(0, len)));
     ffi.calloc.free(ptr);
     return res;
   }

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The problem is with len being -2. I tried debugging but it seems -2 comes from serialport.dll.

final len = call(() => readFunc(ptr));

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@jpnurmi @AriaShishegaran any progress on this one? I started getting this error after switching to SerialPortReader. Before, I was calling port.read(...) myself and had no such issue. The advantage of the reader is that it provides a convenient stream.

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@ricardoboss we are about to release on pub dev the 0.4.0.
Could check the issue against this release as available?

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Sure, I can't say when I have time to test this though

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Sure, I can't say when I have time to test this though

No problem ;)

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