I face errors while compiling code shown below. it gives unexpected errors..what could be the reason?


#define _WIN32_WINNT 0x0602
#include <Windows.h>
#include <powrprof.h>
#include <stdio.h>
#include <tchar.h>


#pragma comment(lib, "PowrProf.lib")

static ULONG isConnectedStandby(PVOID Context, ULONG Type, PVOID Setting);

ULONG isConnectedStandby(PVOID Context, ULONG Type, PVOID Setting)
{
switch(Type)
{
case PBT_APMSUSPEND:
printf( "PBT_APMSUSPEND");
break;
case PBT_APMRESUMESUSPEND:
printf( "PBT_APMRESUMESUSPEND");
break;
case PBT_APMRESUMEAUTOMATIC:
printf( "PBT_APMRESUMEAUTOMATIC");
break;
default:
printf( "DEFAULT");
break;
}
return 0;
}


static _DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS testCallback = {
isConnectedStandby,
nullptr
};


int __cdecl main()
{


HPOWERNOTIFY RegistrationHandle;

printf("Hello world\n");

PowerRegisterSuspendResumeNotification(
DEVICE_NOTIFY_CALLBACK,
&testCallback,
&RegistrationHandle
);
/*
while(true) {
Sleep(1000);
}
*/
return 0;
}




1>------ Rebuild All started: Project: test1, Configuration: Debug Win32 ------
1>Deleting intermediate and output files for project 'test1', configuration 'Debug|Win32'
1>Compiling...
1>standby.cpp
standby.cpp(33) : error C2146: syntax error : missing ';' before identifier 'testCallback'
standby.cpp(33) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
standby.cpp(33) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
standby.cpp(34) : error C2440: 'initializing' : cannot convert from 'ULONG (__cdecl *)(PVOID,ULONG,PVOID)' to 'int'
1> There is no context in which this conversion is possible
standby.cpp(36) : error C2065: 'nullptr' : undeclared identifier
standby.cpp(36) : error C2078: too many initializers
standby.cpp(48) : error C2065: 'DEVICE_NOTIFY_CALLBACK' : undeclared identifier
standby.cpp(47) : error C3861: 'PowerRegisterSuspendResumeNotification': identifier not found