你写的这个能否解释的多一点?
我用网上的一个SPCOMM的程序收不到数据?请大侠帮忙看一下?拜托
var
Form1: TForm1;
viewstring:string;
i:integer;
rbuf,sbuf:array[1..16] of byte;
implementation
{$R *.DFM}
procedure senddata;
var
i:integer;
commflg:boolean;
begin
viewstring:='';
commflg:=true;
for i:=1 to 6 do
begin
if not form1.comm1.writecommdata(@sbuf,1) then
begin
commflg:=false;
break;
end;
//发送时字节间的延时
sleep(2);
viewstring:=viewstring+inttohex(sbuf,2)+'';
end;
viewstring:='发送'+ viewstring;
form1.memo1.lines.add(viewstring);
form1.memo1.lines.add('');
if not commflg then messagedlg('发送失败 !' ,mterror,[mbyes],0);
end;
procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
comm1.StopComm;
end;
procedure TForm1.FormShow(Sender: TObject);
begin
comm1.StartComm;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
sbuf[1]:=byte($f0); //帧头
sbuf[2]:=byte($01); //命令号
sbuf[3]:=byte($ff);
sbuf[4]:=byte($ff);
sbuf[5]:=byte($01);
sbuf[6]:=byte($f0); //帧尾
senddata;//调用发送函数
end;
procedure TForm1.Comm1ReceiveData(Sender: TObject; Buffer: Pointer;
BufferLength: Word);
var
i:integer;
begin
viewstring:='';
move(buffer^,pchar(@rbuf)^,bufferlength);
for i:=1 to bufferlength do
viewstring:=viewstring+inttohex(rbuf,2)+'';
viewstring:='接收'+viewstring;
memo1.lines.add(viewstring);
memo1.lines.add('');
end