为什么一调用DeviceIoControl()就会死机

我作一个DLL与VXD通信但每次执行到DeviceIoControl()时就会死机，相关类似的代码我用一般应用程序试过，没有问题，但为什么在DLL中不能用。
出错时变成黑屏提示如下：
windows protection error,you need to restart your computer

具体程序如下：

#include <stdio.h>
#include <conio.h>
#include <windows.h>
#include <winioctl.h>
#include \"LinkVXD.h\"

#pragma pack(1)

HANDLE hDevice;
int i;
int x;

DWORD WINAPI SecondThread(PVOID hEventRing3)
{
while(TRUE) {
WaitForSingleObject(hEventRing3,INFINITE);
DeviceIoControl(hDevice,READ,0,0,&i,0,0,0);
printf(\"%d\\n\", i);
}
return 0;
}

unsigned short  __declspec(dllexport) LinkVXD(LONG NNN)
{
HANDLE hEventRing3,hEventRing0;
HMODULE hKernel32Dll;
DWORD tid;

x=1;

HANDLE (WINAPI *pfOpenVxDHandle)(HANDLE);
hEventRing3=CreateEvent(0,FALSE,FALSE,NULL);
if (!hEventRing3) {
     fprintf(stderr,\"Failed to create event3...\\n\");
exit(1);
}
hKernel32Dll=LoadLibrary(\"kernel32.dll\");
if (!hKernel32Dll) {
     fprintf(stderr, \"Failed to load...\\n\");
exit(1);
}
pfOpenVxDHandle=(HANDLE(WINAPI *)(HANDLE))GetProcAddress(hKernel32Dll,\"OpenVxDHandle\");
if (!pfOpenVxDHandle) {
     fprintf(stderr, \"Failed to get...\\n\");
exit(1);
}
hEventRing0=(HANDLE)(*pfOpenVxDHandle)(hEventRing3);
if (!hEventRing0) {
     fprintf(stderr, \"Failed to get hEventRing0...\\n\");
exit(1);
}
hDevice=CreateFile(\"\\\\\\\\.\\\\MOUSE.VXD\",0,0,0,CREATE_NEW,FILE_FLAG_DELETE_ON_CLOSE,0);
if (hDevice == INVALID_HANDLE_VALUE) {
return 1;
}
MessageBox(NULL,\"sdfsdfsfs\",\"3\",MB_OK);
if ( !DeviceIoControl(hDevice,hEventPASS,hEventRing0,0,0,0,0,0)) {
MessageBox(NULL,\"sdfsdfsfs\",\"2\",MB_OK);
     fprintf(stderr, \"Failed to pass hEvent...\\n\");
exit(1);
}

MessageBox(NULL,\"sdfsdfsfs\",\"4\",MB_OK);
CreateThread(0,0x1000,SecondThread,hEventRing3,0,&tid);
// printf(\"press any key to exit . . .\\n\");
// getch();
// while(x)
// {;}
CloseHandle(hDevice);
return 0;
}

各位帮忙呀