I'm trying to use the WscRegisterForChanges with C++ function in Windows 7.
Documentation located here:
http://msdn.microsoft.com/en-us/library/bb432507(v=VS.85).aspx
My problem is that even though the callback properly executes, the code crashes when it gets to the end of the callback's execution.
Here's the code in question. It's very simple, so I'm not sure why it's crashing:
#include
#include
#include
void SecurityCenterChangeOccurred(void *param) {
printf("Change occurred!\n");
}
int main() {
HRESULT result = S_OK;
HANDLE callbackRegistration = NULL;
result = WscRegisterForChanges(
NULL,
&callbackRegistration,
(LPTHREAD_START_ROUTINE)SecurityCenterChangeOccurred,
NULL);
while(1) {
Sleep(100);
}
return 0;
}
My call stack looks like this when the crash occurs:
00faf6e8()
ntdll.dll!_TppWorkerThread@4() + 0x1293 bytes
kernel32.dll!@BaseThreadInitThunk@12() + 0x12 bytes
ntdll.dll!___RtlUserThreadStart@8() + 0x27 bytes
ntdll.dll!__RtlUserThreadStart@8() + 0x1b bytes
If I add ExitThread(0); to the end of SecurityCenterChangeOccurred, I get an error and the following trace (So I don't think I should be using ExitThread):
Unhandled exception at 0x7799852b (ntdll.dll) in WscRegisterForChangesCrash.exe: 0xC000071C: An invalid thread, handle %p, is specified for this operation. Possibly, a threadpool worker thread was specified.
ntdll.dll!_TpCheckTerminateWorker@4() + 0x3ca2f bytes
ntdll.dll!_RtlExitUserThread@4() + 0x30 bytes
WscRegisterForChangesCrash.exe!SecurityCenterChangeOccurred(void * param=0x00000000) Line 8 + 0xa bytes C++
wscapi.dll!WorkItemWrapper() + 0x19 bytes
ntdll.dll!_RtlpTpWorkCallback@8() + 0xdf bytes
ntdll.dll!_TppWorkerThread@4() + 0x1293 bytes
kernel32.dll!@BaseThreadInitThunk@12() + 0x12 bytes
ntdll.dll!___RtlUserThreadStart@8() + 0x27 bytes
ntdll.dll!__RtlUserThreadStart@8() + 0x1b bytes
Does anyone have any ideas why this might be happening?
To trigger the crash run the program and turn the firewall on or off.
