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Function Data Types and Return Values
The AVIFile functions and macros use file and stream handlers implemented with
OLE technology. The standard data type of an OLE function is STDAPI, and the function returns an HRESULT value (zero for success or an error otherwise). If a function returns a value
other than an HRESULT, the type of the function's prototype has a slightly different syntax that
embeds the return value type in parentheses following STDAPI_. For example, a function that returns a LONG data value uses STDAPI_(LONG) in the prototype statement.
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Unix Manual Pages
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