C# Signature:
[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAsAttribute(UnmanagedType.Bool)]
static extern bool SetCommBreak([InAttribute] SafeFileHandle fileHandle);
User-Defined Types:
None.
Notes:
You would think the sample code below would generate a 5ms break, but no.
It gives about 2ms longer than the explicit delay. I suppose that's
intentional, per CCITT recommendations for minimum break time, but I don't
see that behavior in the documentation.
Tips & Tricks:
If you need a more accurate break time, you could lower the baud rate, send
a NULL, then restore the baud rate.
Sample Code:
SetCommBreak(hCOM);
Sleep(5);
ClearCommBreak(hCOM);
Alternative Managed API:
Do you know one? Please contribute it!
