Return Values

All the core VB6/C functions in this API return a 32-bit signed integer value, that is a Long in VB6/VBA and a long in C/C++, but an Integer in VB.NET and an int in C#. The wrapper functions provided in the .NET and ActiveX interfaces behave differently (and more conveniently) - please refer to the detailed documentation on those interfaces.

Functions either

1. return zero to indicate success or a non-zero error code; or
2. return a positive value to indicate, say, a required length or CRC value, or a negative error code.

The exception is the set of _Init functions which return a non-zero context handle on success or zero if an error has occurred. Always check the return value before continuing. Use the _InitError function to find out the code for the error that has occurred. The value itself of the context handle is unimportant, but do not change its value.

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