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<div class="moz-cite-prefix">Le 17/08/2019 à 15:00, James Richters a
écrit :<br>
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<div class="WordSection1"><span style="color:windowtext"><o:p></o:p></span>
<p class="MsoNormal"><span style="color:windowtext">Function
TLibUsbInterface.FindEndpoint(MatchFunc :
TLibUsbEndpointMatchMethod) : Plibusb_endpoint_descriptor;<o:p></o:p></span></p>
<span style="color:windowtext">MatchFunc(ED) is where the access
violation occurs, but I can’t trace any further because I
can’t find the function MatchFunc() I just don’t understand
where the actual function is.<o:p></o:p></span><span
style="color:windowtext"><o:p></o:p></span><span
style="color:windowtext"><o:p> </o:p></span><span
style="color:windowtext"></span></div>
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<p><span style="color:windowtext">MatchFunc is a parameter (its type
is </span><span style="color:windowtext"><span
style="color:windowtext">TLibUsbEndpointMatchMethod</span>) of
</span><span style="color:windowtext"><span
style="color:windowtext">TLibUsbInterface.FindEndpoint.</span></span></p>
<p><span style="color:windowtext"><span style="color:windowtext">To
find which function is actually called, you should trace back
where </span></span><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext">TLibUsbInterface.FindEndpoint
is called and what function is provided as parameter
MatchFunc.</span></span></span></p>
<p><span style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext">It's likely you'll have to "climb
up" through several calls, may be that </span></span></span><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext">TLibUsbInterface.FindEndpoint
has itself a parameter </span></span></span></span></span></span><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext">MatchFunc</span></span></span></span></span></span></span></p>
<p><span style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext">If you use the debugger,
the callstack and a breakpoint just before the
offending call to </span></span></span></span></span></span></span><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span
style="color:windowtext"><span
style="color:windowtext"><span
style="color:windowtext"><span
style="color:windowtext"><span
style="color:windowtext"><span
style="color:windowtext"><span
style="color:windowtext">MatchFunc</span></span></span></span></span></span></span>
should help you to find from where comes your
MatchFunc.</span></span></span></span></span></span></span></p>
<p><span style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext">I wouldn't be surprised
that it resolves somewhere to an overridden method
Match of an instance of a class derived from
TLibUsbDeviceMatchClass, likely
TLibUsbDeviceMatchVidPid.Match,
TLibUsbDeviceMatchVidPidSerial.Match or
TLibUsbInterfaceMatchNumAlt.Match from unit
libusbutil.pas</span></span></span></span></span></span></span></p>
<p><span style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext"><span style="color:windowtext"><span
style="color:windowtext">This can sound difficult
for you at the beginning if you're not too much
accustomed with variables of type procedure and
inheritance, but after a few practice it's not that
complicated.<br>
</span></span></span></span></span></span></span></p>
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