请问如何向并口发送数据？？？

[squallbilly]

我不知道如何对并口进行操作，比如发送接受数据，不知道并口有没有类似串口的MSCOMM之类的控件，请大家指教，最好能写详细点儿，源码什么的都写一下，谢谢！！！

[zhangnanonnet]

用API和串口一样,用CREATEFILE.READFILE,WRITEFILE等
给你个例子
extern "C" bool PASCAL Link() //连接到打印机
{
m_hCardInterFace =
CreateFile("LPT1",
GENERIC_WRITE,
NULL,NULL,
OPEN_EXISTING,
NULL,
NULL);
if(m_hCardInterFace!=INVALID_HANDLE_VALUE)
{
m_CommTimeouts.ReadIntervalTimeout = 1000;//读操作两个字节之间的时间(单位:毫秒)
m_CommTimeouts.ReadTotalTimeoutMultiplier = 1000;//读操作的时间(单位:毫秒)
m_CommTimeouts.ReadTotalTimeoutConstant = 1000;
m_CommTimeouts.WriteTotalTimeoutMultiplier = 1000;
m_CommTimeouts.WriteTotalTimeoutConstant = 1000;
SetCommTimeouts(m_hCardInterFace, &m_CommTimeouts);
return true;
}
return false;
}
extern "C" void PASCAL Unlink() //断开打印机
{
CloseHandle(m_hCardInterFace);
}
bool SendCommand(CString CommandWord) //向打印机发出命令,并且返回命令状态
{
DWORD t1,dwRead;
COMSTAT t2;

CString Command=0x1b;
Command+=CommandWord;
Command+=0x0d;
WriteFile(
m_hCardInterFace,
Command.GetBuffer (Command.GetLength ()),
Command.GetLength (),
&dwRead,
NULL);
if(!ClearCommError(m_hCardInterFace,&t1,&t2))
{
switch(t1)
{
case CE_OOP:
TRACE("G CE_OOP\n");
return false;
break;
case CE_PTO://超时错误
TRACE("G CE_PTO\n");
return false;
break;
case CE_IOE:
TRACE("G CE_IOE\n");
return false;
break;
}
}


return true;
}

[唐勉的技术博客]

http://www.naughter.com/parallelport.html