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nwtp06
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r2_hello.pas
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Pascal/Delphi Source File
|
1995-03-01
|
2KB
|
107 lines
{$X+,V-,B-}
program RecHello2;
{ Simple IPX demonstration program, that uses one receive ESR.
Run this program on 1 workstation, run S_HELLO or S1_HELLO on another.
S_HELLO will send "hello world" messages,
this workstation will receive them. }
uses crt,nwMisc,nwIPX;
CONST IOSocket=$5678;
Var ReceiveEcb :Tecb;
IpxHdr :TipxHeader;
socket :word;
buf :array[1..546] of byte;
t :byte;
ReceivedBufLen:word;
PacketReceived:boolean;
RecString :string;
NewStack:array[1..1024] of word; { !! used by ESR }
StackBottom:word; { !! used by ESR }
{$F+}
Procedure ListenESRhandler(Var p:Tpecb);
begin
RecString[0]:=chr(p^.fragment[2].size);
move(p^.fragment[2].address^,RecString[1],byte(RecString[0]));
PacketReceived:=true;
IPXListenForPacket(ReceiveECB);
end;
{$F-}
{$F+}
Procedure ListenESR; assembler;
asm { ES:SI are the only valid registers when entering this procedure ! }
mov dx, seg stackbottom
mov ds, dx
mov dx,ss { setup of a new local stack }
mov bx,sp { ss:sp copied to dx:bx}
mov ax,ds
mov ss,ax
mov sp,offset stackbottom
push dx { push old ss:sp on new stack }
push bx
push es { push es:si on stack as local vars }
push si
mov di,sp
push ss { push address of local ptr on stack }
push di
CALL ListenEsrHandler
add sp,4 { skip stack ptr-copy }
pop bx { restore ss:sp from new stack }
pop dx
mov sp,bx
mov ss,dx
end;
{$F-}
begin
IF NOT IpxInitialize
then begin
writeln('Ipx needs to be installed.');
halt(1);
end;
socket:=IOSocket;
IF NOT IPXopenSocket(Socket,SHORT_LIVED_SOCKET)
then begin
writeln('IPXopenSocket returned error# ',nwIPX.result);
halt(1);
end;
PacketReceived:=False;
{ Empty receive buffer (ReceiveEcb.fragment[2].address^) }
FillChar(buf,546,#0);
{ Setup ECB and IPX header }
IPXsetupListenECB(Addr(ListenESR),IOsocket,@buf,546,
IpxHdr,ReceiveEcb);
IPXListenForPacket(ReceiveECB);
REPEAT
IPXrelinquishControl;
IF PacketReceived { ESR has signalled that a packet has been received }
then begin
writeln(RecString);
PacketReceived:=false;
end;
UNTIL KeyPressed;
IF NOT IPXcloseSocket(IOsocket)
then writeln('IPXcloseSocket returned error# ',nwIPX.result);
end.