IOW24 & windows versions

[bavw]

Hello,

I have build a Delphi-5 application using the hid-component to access a IIC-memory device. Under winXP everything works fine, reading as well as writing from/to the memory device.

The problem arises when using the same application on win2K(SP4) or win98.
Writing to the memory device works ok, but reading results in errors. When reading the 4th report (readfile) the call to ReadFile does not return....
Could this be a problem in the Hid component, the IOW24 or else where in the application ?

Can you give me a hint where to look for the solution ?

thanks in advance

I'have included some source code with debug lines



while ReadResult and // last read result
(TotalRead < Count) and // all bytes read ?
((RxReport.Bytes[0] and $80) =0) and // IIC read errors ?
((RxReport.Bytes[0] and $07) >= 6) do begin // more bytes to read ?
showmessage(' start read: ' +IntToStr(TotalRead));
ReadResult:= ReadFile(RxReport, sizeof(RxReport) ,BytesRead); // read result (ack/nack response)
showmessage(' read ready: ' +IntToStr(TotalRead));
if ReadResult and ((RxReport.Bytes[0] and $80) = 0) then begin // IIC read errors ?
for n:= 0 to (RxReport.Bytes[0] and $07)-1 do // no: copy bytes read to buffer
Byte(Buffer[TotalRead+n]):= RxReport.Bytes[n+1];
inc(TotalRead,n);
end;//if
end;//while

[Guido Körber]

W2K has a problem with requests that result in more than 2 reports getting returned. For some reason it loses some reports.

So when running on W2K you should make sure that you do not use IIC read commands that return more than 2 reports.

[bavw]

Guido,


thanks for the fast reaction.


Does this mean that when i rebuild my application and try using the dll instead I can expect the same results ?


regards,
Bas

[Guido Körber]

Yes, it is a W2K problem, not a problem with the IO-Warrior or its software.