unit uPrinter;
interface
function CheckPrinter: boolean;
function GetPrinterStatus: byte;
implementation
//从并行端口读取打印机状态
function GetPrinterStatus: byte;
asm
MOV DX,$378;
IN AL,DX;
end;
//获取打印机是否出错
function CheckPrinter: boolean;
var
temp: byte;
begin
temp := GetPrinterStatus;
Result := not (((temp and $80) = 0) //打印机忙
or ((temp and $20) <> 0) //打印机缺纸
or ((temp and $10) = 0) //打印机未联机
or ((temp and $08) = 0));
//打印机出错;
end;