Indy TIdTCPClient接收文本
我尝试在idtcpclient中接收文本，但它不起作用。 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;
定时器的时间间隔是8毫秒。 定时器在连接时自动启用。 但是当我发送内容时，我没有收到消息框或错误信息。 我确信我编写了数据，因为当我使用tclientsocket我确实收到了它。
我做错了什么？
改用更像这样的东西：
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;
据说，这种代码可以更好地使用工作线程而不是定时器来实现。
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 := IdTCPClient1.IOHandler.ReadLn;
if (FData <> '') and Assigned(FOnData) then
Synchronize(DataReceived);
end;
end;
procedure TReadingThread.DataReceived;
begin
if Assigned(FOnData) then
FOnData(FData);
end;
2 - 修改你的连接代码：
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;