unit Rawprint;
interface
uses printers,windows;
type TRawprinter =class(TPrinter)
public
dc2 : HDC;
aborted : boolean;
printing : boolean;
lasttime : integer;
procedure abort;
function startraw : boolean;
function endraw: boolean;
function write(s : string): boolean;
function writeln: boolean;
destructor destroy; override;
procedure settimer;
function printerror : boolean;
end;
implementation
uses sysutils,forms,dialogs,controls;
procedure TRawPrinter.settimer;
begin
lasttime:=gettickcount;
end;
function TRawPrinter.printerror : boolean;
var r : integer;
begin
result:=false;
if (gettickcount>lasttime+15000) or (gettickcount begin
r:=messagedlg('Error '+inttostr(getlasterror)+' Printing on '+printers[printerindex],mterror,[mbretry,mbabort,mbignore],0);
if r=mrretry then
result:=false
else
begin
result:=true;
if r=mrabort then
abort;
end;
settimer;
end;
end;
procedure TRawPrinter.abort;
begin
abortdoc(dc2);
endraw;
end;
function AbortProc(Prn: HDC; Error: Integer): Bool; stdcall;
begin
Application.ProcessMessages;
Result := not TRawprinter(Printer).Aborted;
end;
type
TPrinterDevice = class
Driver, Device, Port: String;
constructor Create(ADriver, ADevice, APort: PChar);
function IsEqual(ADriver, ADevice, APort: PChar): Boolean;
end;
constructor TPrinterDevice.Create(ADriver, ADevice, APort: PChar);
begin
inherited Create;
Driver := ADriver;
Device := ADevice;
Port := APort;
end;
function TPrinterDevice.IsEqual(ADriver, ADevice, APort: PChar): Boolean;
begin
Result := (Device = ADevice) and (Port = APort);
end;
destructor TRawprinter.destroy;
begin
if dc2<>0 then
deletedc(dc2);
end;
function TRawprinter.startraw:boolean;
var
CTitle: array[0..31] of Char;
CMode : Array[0..4] of char;
DocInfo: TDocInfo;
r : integer;
begin
result:=false;
StrPLCopy(CTitle, Title, SizeOf(CTitle) - 1);
StrPCopy(CMode, 'RAW');
FillChar(DocInfo, SizeOf(DocInfo), 0);
with DocInfo do
begin
cbSize := SizeOf(DocInfo);
lpszDocName := CTitle;
lpszOutput := nil;
lpszDatatype :=CMode;
end;
with TPrinterDevice(Printers.Objects[PrinterIndex]) do
begin
if dc2=0 then
begin
DC2 := CreateDC(PChar(Driver), PChar(Device), PChar(Port), nil);
if dc2=0 then
begin
result:=false;
exit;
end;
SetAbortProc(dc2, AbortProc);
end;
end;
settimer;
aborted:=false;
repeat
application.processmessages;
until (StartDoc(dc2, DocInfo)>0) or printerror;
if not aborted then
printing:=true;
result:=printing;
end;
function TRawprinter.endraw : boolean;
begin
settimer;
if not aborted and printing then
repeat
application.processmessages;
until (windows.enddoc(dc2)>0) or printerror;
printing:=false;
result:=not aborted;
end;
type passrec = packed record
l : word;
s : Array[0..255] of char;
end;
var pass : Passrec;
function TRawprinter.write(s : string):boolean;
var tmp : string;
begin
result:=false;
if not aborted and printing then
while s<>'' do
begin
result:=false;
tmp:=copy(s,1,255);
delete(s,1,255);
pass.l:=length(tmp);
strpcopy(pass.s,tmp);
settimer;
repeat
application.processmessages
until (escape(dc2,PASSTHROUGH,0,@pass,nil)>=0) or printerror;
if aborted then
break;
result:=true;
end;
end;
function TRawprinter.writeln : boolean;
begin
pass.l:=2;
strpcopy(pass.s,#13#10);
settimer;
repeat
application.processmessages
until (escape(dc2,PASSTHROUGH,0,@pass,nil)>=0) or printerror;
result:=not aborted;
end;
end.