unit SMSDDE;
{Schrittmotor-DDE-Objekt}
interface
uses
WinProcs, WinTypes,
Win31, ODDE, DDEML, Strings, SMSH, SMSP;
const
DdeLastSystem=5;
DdeSystemS: array[0..DdeLastSystem]of PChar=
('System','Topics','Formats','Help','TopicItemList','SysItems');
DdeStrings:array[0..5]of PChar=(nil,DdeTopic+' %s','CF_TEXT',
'MPK3 Schrittmotor-Ansteuerung'#13#10+
'Topics: '+DdeTopic+' und %s (Alias)'#13#10+
'Items: '+DdeItem1+' (enthaelt Position),'#13#10+
' '+DdeItem2+' (<>0 solange sich Motor bewegt),'#13#10+
' '+DdeItem3+' (<>0 wenn Referenzfahrt ausgefuehrt wurde)'#13#10+
'Execs: Move xxx, Stop, Free, Sync, Init'#13#10,
{ 'Execs: Move xxx (Position nach xxx setzen),'#13#10+
' Stop (Motor anhalten), Free (Spulen stromfrei schalten),'#13#10+
' Sync (nur Referenzfahrt), Init (vollst. mit Benutzermeldung)'#13#10,}
DdeItem1+' '+DdeItem2+' '+DdeItem3,
'Topics Formats Help TopicItemList SysItems');
type
PMyDDE=^TMyDDE;
TMyDDE=object(TDDE)
MainWnd: HWnd; {zum Versenden von Messages}
ServiceHsz: Hsz; {Stringhandles}
DataHsz: array[0..DdeLastData]of Hsz; {Index Null ist immer das Topic}
SysHsz: array[0..DdeLastSystem]of Hsz;
Alias: PChar; AliasHsz: Hsz;
Connections: Integer;
Advising: array[1..DdeLastData]of Byte; {<>0 bedeutet autom. Info}
constructor Init(SendMsgToWindow:HWnd);
destructor Done; virtual;
function _Connect(var DdeMsg:TDdeMsg):HDdeData; virtual;
function _Disconnect(var DdeMsg:TDdeMsg):HDdeData; virtual;
function _AdvStart(var DdeMsg:TDdeMsg):HDdeData; virtual;
function _AdvStop(var DdeMsg:TDdeMsg):HDdeData; virtual;
function _Request(var DdeMsg:TDdeMsg):HDdeData; virtual;
function _Poke(var DdeMsg:TDdeMsg):HDdeData; virtual;
function _Execute(var DdeMsg:TDdeMsg):HDdeData; virtual;
function CreateStringHandle(Str:PChar):Hsz;
procedure FreeStringHandle(Stringhandle:Hsz);
function IsData(var DdeMsg:TDdeMsg):Word;
function IsSystem(var DdeMsg:TDdeMsg):Word;
procedure Advise(Item:Word); {Ruf von auáen}
procedure SetAlias(AnAlias:PChar);
{Rufe nach auáen sind:
- Verbindungsanzeige ein/aus (wParam=Bool)
- Ver„nderung des Wertes (lParam=DataHandle)
- Execute}
end;
implementation
constructor TMyDDE.Init;
var
I: Integer;
begin
inherited Init(hInstance, CBF_Skip_Connect_Confirms or
CBF_Skip_Registrations or CBF_Skip_Unregistrations);
MainWnd:=SendMsgToWindow; {Ziel-Fenster setzen}
ServiceHsz:=CreateStringHandle(AppName);
for I:=0 to DdeLastData do
DataHsz[I]:=CreateStringHandle(DdeDataS[I]);
for I:=0 to DdeLastSystem do
SysHsz[I]:=CreateStringHandle(DdeSystemS[I]);
AliasHsz:=0;
Connections:=0;
FillChar(Advising,sizeof(Advising),0); {erst mal ColdLinks}
if DdeNameService(Inst,ServiceHsz,0,DNS_Register)=0 then
Error(3);
end;
destructor TMyDDE.Done;
var
I:Integer;
begin
for I:=DdeLastData downto 0 do
FreeStringHandle(DataHsz[i]);
for I:=DdeLastSystem downto 0 do
FreeStringHandle(SysHsz[i]);
if AliasHsz<>0 then FreeStringHandle(AliasHsz);
FreeStringHandle(ServiceHsz);
inherited Done;
end;
function TMyDDE._Connect;
begin
_Connect:=0; {Keine Verbindung}
if (DdeCmpStringHandles(DdeMsg.Hsz2,ServiceHsz)=0) then begin
if (DdeCmpStringHandles(DdeMsg.Hsz1,DataHsz[0])=0)
or (DdeCmpStringHandles(DdeMsg.Hsz1,AliasHsz)=0)
or (DdeCmpStringHandles(DdeMsg.Hsz1,SysHsz[0])=0) then begin
if Connections=0 then SendMessage(MainWnd,WM_Connect,1,0);
Inc(Connections);
_Connect:=1; {Verbindung okay!}
end;
end;
end;
function TMyDDE._Disconnect;
begin
Dec(Connections);
if Connections=0 then SendMessage(MainWnd,WM_Connect,0,0);
{Verbindungs-LED ausschalten}
end;
function TMyDDE._Request;
var
S: TS31;
W: Word;
SP:PChar;
begin
_Request:=0;
W:=IsData(DdeMsg);
if W<>0 then begin {String fllen lassen}
SendMessage(MainWnd,WM_Request,W,LongInt(@S));
_Request:=DdeCreateDataHandle(Inst,@S,lStrLen(S)+1,0,DataHsz[W],CF_Text,0);
end else begin
W:=IsSystem(DdeMsg);
if W<>0 then begin
GetMem(SP,1024); {viel Platz fr den String ohne Stackbelastung}
wvsprintf(SP,DdeStrings[W],Alias); {Vorhandenes Alias einsetzen}
_Request:=DdeCreateDataHandle(Inst,SP,lStrLen(SP)+1,
0,SysHsz[W],CF_Text,0);
FreeMem(SP,1024);
end;
end;
end;
function TMyDDE._AdvStart;
var
W: Word;
begin
_AdvStart:=0;
W:=IsData(DdeMsg);
if W<>0 then begin
if Advising[W]<255 then {Anzahl erh”hen, jedoch}
Inc(Advising[W]); {ohne šberlauf!}
_AdvStart:=1;
end;
end;
function TMyDDE._AdvStop;
var
W: Word;
begin
_AdvStop:=0;
W:=IsData(DdeMsg);
if W<>0 then begin
if Advising[W]>0 then {Anzahl erniedrigen, jedoch}
Dec(Advising[W]); {ohne Unterlauf!}
_AdvStop:=1;
end;
end;
function TMyDDE._Poke;
var
S:TS31;
W:Word;
begin
_Poke:=DDE_FNotProcessed; {Pessimistisch}
W:=IsData(DdeMsg);
if W<>0 then begin
S[DdeGetData(DdeMsg.Data,@S,sizeof(S)-1,0)]:=#0;
_Poke:=SendMessage(MainWnd,WM_Poke,W,LongInt(@S));
end;
end;
function TMyDDE._Execute;
var
S:TS31;
begin
_Execute:=DDE_FNotProcessed;
if (DdeCmpStringHandles(DdeMsg.Hsz1,DataHsz[0])=0)
or (DdeCmpStringHandles(DdeMsg.Hsz1,AliasHsz)=0) then begin
DdeGetData(DdeMsg.Data,@S,sizeof(S),0);
_Execute:=SendMessage(MainWnd,WM_Execute,lStrLen(S)+1,LongInt(@S));
end;
end;
function TMyDDE.CreateStringHandle;
var Stringhandle: Hsz;
begin
Stringhandle:=DdeCreateStringHandle(Inst,Str,CP_WinAnsi);
CreateStringHandle:=StringHandle;
if StringHandle=0 then Error(2);
end;
procedure TMyDDE.FreeStringHandle;
begin
if Stringhandle<>0 then
DdeFreeStringHandle(Inst,StringHandle);
end;
procedure TMyDDE.Advise(Item:Word);
{Žnderungen mitteilen, wenn gewnscht (Warm (Hot?)-Link)}
begin
if Advising[Item]<>0 then
DdePostAdvise(Inst,DataHsz[0],DataHsz[Item]);
end;
procedure TMyDDE.SetAlias(AnAlias:PChar);
begin
if AliasHsz<>0 then FreeStringHandle(AliasHsz);
if AnAlias<>nil then begin
AliasHsz:=CreateStringHandle(AnAlias);
Alias:=AnAlias;
end else begin
AliasHsz:=0;
Alias:=''; {Merker fr Ausgabe niemals nil setzen!}
end;
end;
function TMyDDE.IsData(var DdeMsg:TDdeMsg):Word;
var
W: Word;
begin
IsData:=0; {Kein Datum!}
if DdeMsg.Fmt<>CF_Text then exit;
if (DdeCmpStringHandles(DdeMsg.Hsz1,DataHsz[0])<>0)
and (DdeCmpStringHandles(DdeMsg.Hsz1,AliasHsz)<>0) then exit;
for W:=1 to DdeLastData do
if DdeCmpStringHandles(DdeMsg.Hsz2,DataHsz[W])=0 then begin
IsData:=W;
exit;
end;
end;
function TMyDDE.IsSystem(var DdeMsg:TDdeMsg):Word;
var
W: Word;
begin
IsSystem:=0; {Kein Datum!}
if DdeMsg.Fmt<>CF_Text then exit;
if DdeCmpStringHandles(DdeMsg.Hsz1,SysHsz[0])<>0 then exit;
for W:=1 to DdeLastSystem do
if DdeCmpStringHandles(DdeMsg.Hsz2,SysHsz[W])=0 then begin
IsSystem:=W;
exit;
end;
end;
end.
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