Compile Errors

Using callback.h

If you get

c:\instrument\apps\epics2\support\hvcaenx527\master\libhvcaenx527app\src\hvcaenx527.h(79): error C2059: syntax error: '__cdecl'
c:\instrument\apps\epics2\support\hvcaenx527\master\libhvcaenx527app\src\hvcaenx527.h(80): error C2059: syntax error: '}'
c:\instrument\apps\epics2\support\hvcaenx527\master\libhvcaenx527app\src\hvcaenx527chaio.c(42): error C2223: left of '->evntno' must point to struct/union

when including callback.h it is because EPICS defines CALLBACK as a structure, windows defines it as __cdecl. If you need to include windows.h you must include it before epics redefines CALLBACK in callback.h Including osiSock.h is a workaround as that pulls in windows.h but it may be better to be explicit with

#ifdef _WIN32
#include <windows.h> /* we need to make sure EPICS callback.h is loaded after windows.h */
#endif