myport.cpp

华中科技大学计算机学院接口课程设计.vc制作,上位机下位机模拟商场贵宾卡系统.使用access数据库.

#include "stdafx.h"
#include "conio.h"
#include "windows.h"
#include <winioctl.h>
#include "myport.h"


HANDLE PortTalk_Handle = NULL;        /* Handle for PortTalk Driver */
unsigned char OpenPortTalk()
{
	PortTalk_Handle = CreateFile("\\\\.\\MPNP1", 
		GENERIC_READ | GENERIC_WRITE, 
		0, 
		NULL,
		OPEN_EXISTING, 
		FILE_ATTRIBUTE_NORMAL, 
		NULL);
	if(PortTalk_Handle == INVALID_HANDLE_VALUE)
	{
		return -1;
	}
	return 0;
}

void ClosePortTalk()
{
	CloseHandle(PortTalk_Handle);
}

void outportb(unsigned short PortAddress, unsigned char byte)
{

	DWORD       dwError = 0;
	
    unsigned int error;
    DWORD BytesReturned;        
    unsigned char Buffer[2];
    unsigned char * pBuffer;
    pBuffer = (unsigned char *)&Buffer[0];
	*pBuffer = (unsigned char)PortAddress&0x0f;
	//	*pBuffer = (unsigned char)PortAddress;
    Buffer[2] = byte;
	
    error = DeviceIoControl(PortTalk_Handle,
		IOCTL_WRITE_PORT_UCHAR,
		&Buffer,
		3,
		NULL,
		0,
		&BytesReturned,
		NULL);
	
    //if (!error) printf("Error occured during outportb while talking to PortTalk driver %d\n",GetLastError());
}


unsigned char inportb(unsigned short PortAddress)
{
    unsigned int error;
    DWORD BytesReturned;
    unsigned char Buffer[3];
    unsigned short * pBuffer;
    pBuffer = (unsigned short *)&Buffer[0];
    *pBuffer = (unsigned char)PortAddress&0x0f;
	//*pBuffer = (unsigned char)PortAddress; 
	
	error = DeviceIoControl(PortTalk_Handle,
		IOCTL_READ_PORT_UCHAR,
		&Buffer,
		2,
		&Buffer,
		1,
		&BytesReturned,
		NULL);
	
    //if (!error) printf("Error occured during inportb while talking to PortTalk driver %d\n",GetLastError());
    return(Buffer[0]);
	
}