#include <windows.h>
#include <stdio.h>
#include <process.h>

UINT WINAPI Thread(LPVOID context)
{
	printf("Enter Thread\n");
	//等待5秒
	OVERLAPPED overlap={0};
	overlap.hEvent = CreateEvent(NULL,FALSE,FALSE,NULL);
	UCHAR buffer[10];
	ULONG ulRead;
	
	BOOL bRead = ReadFile(*(PHANDLE)context,buffer,10,&ulRead,&overlap);

	//可以試驗取消例程
	//CancelIo(*(PHANDLE)context);
	WaitForSingleObject(overlap.hEvent,INFINITE);
	return 0;
}

int main()
{
	HANDLE hDevice = 
		CreateFile("\\\\.\\HelloDDK",
					GENERIC_READ | GENERIC_WRITE,
					FILE_SHARE_READ,
					NULL,
					OPEN_EXISTING,
					FILE_ATTRIBUTE_NORMAL|FILE_FLAG_OVERLAPPED,//此處設置FILE_FLAG_OVERLAPPED
					NULL );

	if (hDevice == INVALID_HANDLE_VALUE)
	{
		printf("Open Device failed!");
		return 1;
	}

	HANDLE hThread[2];
	hThread[0] = (HANDLE) _beginthreadex (NULL,0,Thread,&hDevice,0,NULL);
	hThread[1] = (HANDLE) _beginthreadex (NULL,0,Thread,&hDevice,0,NULL);

	//主線程等待兩個子線程結束
	WaitForMultipleObjects(2,hThread,TRUE,INFINITE);
	
	//創建IRP_MJ_CLEANUP IRP
	CloseHandle(hDevice);

	return 0;
}