DLL with BOOL definition

[trisol]

I am trying to read digital I/Os build into the controller running DAQ.

The manufacturer provides an API dll with functions that always return a BOOL.

For example:

BOOL SusiIOReadEx(BYTE PinNum, BOOL *status)

where PinNum is the "address" of the digital input to be read and Status is a pointer to a variable where the digital input status will be returned to.

The Return is 1 for success and 0 for failure to read.

using the extern function in DAQ with BOOL definition returns an error "invalid argument specified". The documentation for function prototypes does NOT list bool as a valid data type!

Does this mean I cannot use these dll-functions?

(I tried using different byte instead of bool and the extern works but the function does not return the digital status.)

[AzeoTech]

BOOL is defined somewhere in the header chain because its not a valid C data type. Its probably defined as an unsigned long, but it could be an unsigned short, or an unsigned byte. BYTE is almost certainly an unsigned byte.