Thread: DeviceIOControl()

I'm getting error 87 (Invalid parameter) from DeviceIOControl():

Code:

#define CTL_CODE( DeviceType, Function, Method, Access ) (((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method) )

#define FILE_DEVICE_UNKNOWN		0x00000022
#define IOCTL_UNKNOWN_BASE		FILE_DEVICE_UNKNOWN
#define METHOD_BUFFERED			0
#define FILE_READ_ACCESS		0x0001
#define FILE_WRITE_ACCESS		0x0002

#define IOCTL_CE_READMEMORY		CTL_CODE(IOCTL_UNKNOWN_BASE, 0x0800, METHOD_BUFFERED, FILE_READ_ACCESS | FILE_WRITE_ACCESS)
#define IOCTL_CE_WRITEMEMORY		CTL_CODE(IOCTL_UNKNOWN_BASE, 0x0801, METHOD_BUFFERED, FILE_READ_ACCESS | FILE_WRITE_ACCESS)
#define IOCTL_CE_OPENPROCESS    	CTL_CODE(IOCTL_UNKNOWN_BASE, 0x0802, METHOD_BUFFERED, FILE_READ_ACCESS | FILE_WRITE_ACCESS)


bool LoadDriver::WriteByte(DWORD _Address, BYTE _Byte, int _PID)
{
	unsigned long recv;
		struct input 
		{ 
		   UINT_PTR processid; 
		   void *startaddress; 
		   unsigned short int bytestowrite;  
		} _Input = {_PID, (void*)_Address, _Byte};
		HANDLE mService = CreateFile("C:\\Rakion\\dbk32.sys", FILE_WRITE_DATA | FILE_READ_DATA, FILE_SHARE_READ | FILE_SHARE_WRITE,
		NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
		cout<<GetLastError()<<"\n"<<flush;
		DeviceIoControl(mService,IOCTL_CE_WRITEMEMORY,&_Input,sizeof(_Input),NULL,NULL,&recv,NULL);
		cout<<GetLastError()<<"      "<<mService<<"\n"<<flush;
	return 0;
}

As you can see, I used GetLastError(); after CreateFile and DeviceIoControl(); I get 0 (No Error) after CreateFile and 87 (Invalid parameter) after DeviceIoControl.

Which parameter is wrong? I've tried at least 20 variations of the function.