[英]Indy TIdTCPClient receive text
I try to receive text in a idtcpclient but it does not work.我尝试在 idtcpclient 中接收文本,但它不起作用。 This is the code that I use in a timer:这是我在计时器中使用的代码:
procedure TForm1.Timer2Timer(Sender: TObject);
var
receivedtext:string;
begin
if idtcpclient1.Connected = true then
begin
with idtcpclient1 do
begin
if not IOHandler.InputBufferIsEmpty then
begin
try
receivedtext := IOHandler.ReadLn;
finally
if receivedtext = '' = false then
begin
showmessage(receivedtext);
idtcpclient1.IOHandler.InputBuffer.Clear;
receivedtext := '';
end;
end;
end;
end;
end
else
begin
timer2.Enabled := false;
end;
end;
The interval of the timer is 8 ms.定时器的间隔为 8 毫秒。 The timer is automatically enabled on connect.计时器在连接时自动启用。 But I don't get an messagebox or an error when I send something.但是当我发送一些东西时,我没有收到消息框或错误。 I am sure that I written the data because when I use tclientsocket
I do receive it.我确信我写了数据,因为当我使用tclientsocket
我确实收到了它。
What I am doing wrong?我做错了什么?
Use something more like this instead:使用更像这样的东西:
procedure TForm1.Timer2Timer(Sender: TObject);
var
receivedtext: string;
begin
with IdTCPClient1 do
begin
try
if IOHandler.InputBufferIsEmpty then
begin
IOHandler.CheckForDataOnSource(0);
IOHandler.CheckForDisconnect;
if IOHandler.InputBufferIsEmpty then Exit;
end;
receivedtext := IOHandler.ReadLn;
except
Timer2.Enabled := False;
Exit;
end;
if receivedtext <> '' then
ShowMessage(receivedtext);
end;
end;
With that said, this kind of code would be better implemented using a worker thread instead of a timer.话虽如此,这种代码最好使用工作线程而不是计时器来实现。
1 - Create a new class derived from TThread
(File > New > Other > Thread Object) 1 - 创建一个从TThread
派生的新类(文件 > 新建 > 其他 > 线程对象)
type
TDataEvent = procedure(const Data: string) of object;
TReadingThread = class(TThread)
private
FClient: TIdTCPClient;
FData: string;
FOnData: TDataEvent;
procedure DataReceived;
protected
procedure Execute; override;
public
constructor Create(AClient: TIdTCPClient); reintroduce;
property OnData: TDataEvent read FOnData write FOnData;
end;
constructor TReadingThread.Create(AClient: TIdTCPClient);
begin
inherited Create(True);
FClient := AClient;
end;
procedure TReadingThread.Execute;
begin
while not Terminated do
begin
FData := FClient.IOHandler.ReadLn;
if (FData <> '') and Assigned(FOnData) then
Synchronize(DataReceived);
end;
end;
procedure TReadingThread.DataReceived;
begin
if Assigned(FOnData) then
FOnData(FData);
end;
2 - Modify your connection code: 2 - 修改您的连接代码:
IdTCPClient1.Connect;
try
Thread := TReadingThread.Create(IdTCPClient1);
Thread.OnData := DataReceived;
Thread.Resume;
except
IdTCPClient1.Disconnect;
raise;
end;
...
if Assigned(Thread) then Thread.Terminate;
try
IdTCPClient1.Disconnect;
finally
if Assigned(Thread) then
begin
Thread.WaitFor;
FreeAndNil(Thread);
end;
end;
...
procedure TForm1.DataReceived(const Data: string);
begin
ShowMessage(Data);
end;
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