bhh:=tbhh.create(false);
button1.enabled:=false;
button2.enabled:=true;
button3.enabled:=true;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
if dstep=false then begin bhh.suspend; dstep:=true end
else bhh.resume
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
dstep:=false; bhh.resume;
end;
。2)代碼單元unit2:
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