Hi,
I've an app the reads 4 comm ports sequentially for RS232 input data in quick succession. All 4 comms are read within a span of one second. In switching from one com to another, I use the portopen method to open & close each accordingly.
The problem is that after a random amount of time, the portopen method generates an error "Unable to open port due to invalid parameter". I've checked thru all the parameters but found no invalid parameter.
It only happens when I'm reading from comm ports that are not onboard but that are from a serial Comm PCI card inserted to expand the number of comm ports to 4 instead of the standard 2.
I've read that MScomm32 has a problem with memory leaks upon repeated usage but I'm already on VFP6SP3. (it was documented to be fixed in Visual Studio 97 SP3).
I've tried the app on WinXP as well as Win98SE with the same result.
Worse was when I tried to use USB to Serial converters where the XP machine generated a core dump and had to be shut down.
Any clues to what's the cause?
Any help is appreciated.
Yau