c# - CallbackOnCollectedDelegate was detected on Walther MFS100 Check Scanner -


i trying programming interface walther mfs100 check scanner after scan "callbackoncollecteddelegate detected" error. how can fix this. use .net 2.0 c# 

[dllimport("mflib.dll.stdcall")]         public static extern int mfscanfeeder(int mode, int font, int timeout);   retval = modmfs100.mfscanfeeder(0, 2,5000);

it isn't particular api call that's source of problem. api obscure , poorly documented give straight answer, initialization style function let's set callback. callback cause of exception. must create delegate object , store in field of class. way garbage collector sees reference , won't garbage collect it.

thus, instead of:

void setupscanner() {     mfinitialize(something, mycallback); }

do this:

somedelegatetype callback;  void setupscanner() {     callback = new somedelegatetype(mycallback);     mfinitialize(something, callback); }

contact vendor support if doesn't help.


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