"error LNK2019: unresolved external symbol _HookZwCreateProcess@0 "如何解决？谢谢！

HookZwCreateProcess例程的实现放在了Process.c中，
形式如下：
VOID NTAPI HookZwCreateProcess()
{
。。。。
}
HookZwCreateProcess例程的声明放在了Process.h中，
形式如下：
VOID NTAPI HookZwCreateProcess();

而真正的调用，放在了Main.c中，
形式如下：
NTSTATUS
DeviceControl(
IN PFILE_OBJECT FileObject,
IN BOOLEAN Wait,
IN PVOID InputBuffer,
IN ULONG InputBufferLength,
OUT PVOID OutputBuffer,
IN ULONG OutputBufferLength,
IN ULONG IoControlCode,
OUT PIO_STATUS_BLOCK IoStatus,
IN PDEVICE_OBJECT DeviceObject
)
{
IoStatus->Status = STATUS_SUCCESS;
IoStatus->Information = 0;

switch( IoControlCode )
{
case CTL_CODE_LSR_HOOK_ZWCREATEPROCESS:
{
HookZwCreateProcess();
}
break;
default:break;
}

return IoStatus->Status;
}

编译时，出现了：
error LNK2019: unresolved external symbol _HookZwCreateProcess@0 referenced in function _DeviceControl@36
错误提示，如何解决？
谢谢大侠