[英]indy TCP and activex connect to server issues
我正在尝试将delphi项目从VCL转换为ActiveX。 我的客户端线程有问题。 这是我的客户端线程类型:
type
TClientThread = class(TThread)
private
Command: string;
procedure HandleInput;
protected
procedure Execute; override;
end;
这是实现:
procedure TClientThread.HandleInput;
begin
activext.ProcessCommands(Command);
Command := '';
end;
procedure Tactivextest.ProcessCommands(Command: string);
var
Params: array [1 .. 10] of String;
ParamsCount, P: Integer;
PackedParams: TPackedParams;
PStr: String;
IdBytes: TIdBytes;
Ms: TMemoryStream;
ReceiveParams, ReceiveStream: Boolean;
Size: Int64;
begin
Ms := TMemoryStream.Create;
ReceiveParams := False;
ReceiveStream := False;
if Command[1] = '1' then // command with params
begin
Command := Copy(Command, 2, Length(Command));
ReceiveParams := True;
end
else if Command[1] = '2' then // command + memorystream
begin
Command := Copy(Command, 2, Length(Command));
ReceiveStream := True;
Ms.Position := 0;
end
else if Command[1] = '3' then // command with params + memorystream
begin
Command := Copy(Command, 2, Length(Command));
ReceiveParams := True;
ReceiveStream := True;
end;
if ReceiveParams then // params incomming
begin
TCPClient.Socket.ReadBytes(IdBytes, SizeOf(PackedParams), False);
BytesToRaw(IdBytes, PackedParams, SizeOf(PackedParams));
ParamsCount := 0;
repeat
Inc(ParamsCount);
P := Pos(Sep, String(PackedParams.Params));
Params[ParamsCount] := Copy(String(PackedParams.Params), 1, P - 1);
Delete(PackedParams.Params, 1, P + 4);
until PackedParams.Params = '';
end;
if ReceiveStream then // stream incomming
begin
Size := TCPClient.Socket.ReadInt64;
TCPClient.Socket.ReadStream(Ms, Size, False);
Ms.Position := 0;
end;
if Command = 'SIMPLEMESSAGE' then
begin
MessageDlg(Params[1], mtInformation, [mbOk], 0);
end;
if Command = 'INVALIDPASSWORD' then
begin
TCPClient.Disconnect;
MessageDlg('Invalid password!', mtError, [mbOk], 0);
end;
if Command = 'SENDYOURINFO' then // succesfully loged in
begin
UniqueID := StrToInt(Params[1]);
Panel1.Caption := 'connect ' + namewithicon + ')';
PStr := namewithicon + Sep;
SendCommandWithParams(TCPClient, 'TAKEMYINFO', PStr);
end;
if Command = 'DISCONNECTED' then
begin
if TCPClient.Connected then
TCPClient.Disconnect;
end;
if Command = 'TEXTMESSAGE' then
begin
memo1.Lines.Add(Params[1] + ' : ' + Params[2] )
end;
end;
procedure TClientThread.Execute;
begin
inherited;
while not Terminated do
begin
if not activext.TCPClient.Connected then
Terminate
else
begin
if activext.TCPClient.Connected then
Command := activext.TCPClient.Socket.ReadLn('', 5);
if Command <> '' then
Synchronize(HandleInput);
end;
end;
end;
initialization
TActiveFormFactory.Create(
ComServer,
TActiveFormControl,
Tactivextest,
Class_activextest,
0,
'',
OLEMISC_SIMPLEFRAME or OLEMISC_ACTSLIKELABEL,
tmApartment);
end.
这是我使用Indy的TCP OnConnected
事件启动客户端线程的方式:
procedure Tactivextest.TCPClientConnected(Sender: TObject);
begin
ClientThread := TClientThread.Create(True);
ClientThread.Start;
SendCommandWithParams(TCPClient, 'LOGIN', namewithicon + Sep);
end;
这是我在表单的OnCreate
事件上连接到服务器的方式:
begin
if not TCPClient.Connected then
begin
TCPClient.Host := 'localhost';
TCPClient.Port := 31000;
try
TCPClient.Connect;
except
on E: Exception do
begin
MessageDlg('Cannot connect to server!', mtInformation, [mbOk], 0);
Application.Terminate;
end;
end;
end
else
begin
SendCommand(TCPClient, 'DISCONNECTED');
if TCPClient.Connected then
TCPClient.Disconnect;
end;
end;
发送命令
procedure Tactivextest.SendBuffer(TCPClient: TIdTCPClient; Buffer: TIdBytes;
BufferSize: Cardinal);
begin
if not TCPClient.Connected then
Exit;
TCPClient.Socket.WriteLn('AUDIO');
TCPClient.Socket.Write(BufferSize);
TCPClient.Socket.Write(Buffer, BufferSize);
end;
procedure Tactivextest.SendCommand(TCPClient: TIdTCPClient; Command: string);
begin
if not TCPClient.Connected then
Exit;
TCPClient.Socket.WriteLn(Command);
end;
procedure Tactivextest.SendCommandWithParams(TCPClient: TIdTCPClient;
Command, Params: String);
var
PackedParams: TPackedParams;
begin
if not TCPClient.Connected then
Exit;
TCPClient.Socket.WriteLn('1' + Command);
PackedParams.Params := ShortString(Params);
TCPClient.Socket.Write(RawToBytes(PackedParams, SizeOf(PackedParams)));
end;
procedure Tactivextest.SendStream(TCPClient: TIdTCPClient; Ms: TMemoryStream);
begin
if not TCPClient.Connected then
Exit;
Ms.Position := 0;
with TCPClient.Socket do
begin
Write(Ms.Size);
WriteBufferOpen;
Write(Ms, 0);
WriteBufferClose;
end;
end;
procedure Tactivextest.SendCommandAndStream(TCPClient: TIdTCPClient; Command: String;
Ms: TMemoryStream);
begin
if not TCPClient.Connected then
Exit;
TCPClient.Socket.WriteLn('2' + Command);
Ms.Position := 0;
with TCPClient.Socket do
begin
Write(Ms.Size);
WriteBufferOpen;
Write(Ms, 0);
WriteBufferClose;
end;
end;
procedure Tactivextest.SendCommandWithParamsAndStream(TCPClient: TIdTCPClient;
Command, Params: String; Ms: TMemoryStream);
var
PackedParams: TPackedParams;
begin
if not TCPClient.Connected then
Exit;
SendCommand(TCPClient, '3' + Command);
PackedParams.Params := ShortString(Params);
TCPClient.Socket.Write(RawToBytes(PackedParams, SizeOf(PackedParams)));
Ms.Position := 0;
with TCPClient.Socket do
begin
Write(Ms.Size);
WriteBufferOpen;
Write(Ms, 0);
WriteBufferClose;
end;
end;
我能够连接到服务器,但是客户端线程无法与VCL相同地启动,因此由于我无法使用ActiveX内的客户端线程,因此我已断开连接,因此无法调用SendCommands()
。 我已经搜寻了很多天有关如何解决的信息,但找不到解决该问题的方法。 我知道ActiveX已死,但这是出于教育目的。
如果Connect()
成功,则不可能触发TIdTCPClient.OnConnected
,因此必须创建客户端线程。 如果Start()
没有引发异常,则线程将开始运行。
然而,你的线程代码的一个主要问题是, HandleInput()
被主线程的上下文中运行通过TThread.Synchronize()
这并不在DLL中工作(ActiveX或以其他方式),而主线程的额外合作托管EXE。 HandleInput()
根本不应该同步,但是一旦解决, ProcessCommands()
就会执行非线程安全的操作(使用MessageDlg()
,并直接访问Panel1
和Memo1
),这确实需要同步。
因此,您需要重新编写线程逻辑以避免这些陷阱。 尝试更多类似这样的方法:
type
TClientThread = class(TThread)
protected
procedure Execute; override;
end;
procedure TClientThread.Execute;
begin
activext.SendCommandWithParams(activext.TCPClient, 'LOGIN', activext.namewithicon + activext.Sep);
while (not Terminated) and activext.TCPClient.Connected do
begin
Command := activext.TCPClient.Socket.ReadLn('', 5);
if Command <> '' then
activext.ProcessCommands(Command);
end;
end;
type
Tactivextest = class(TActiveForm)
TCPClient: TIdTCPClient;
...
private
...
LineToAdd: string;
procedure UpdatePanel;
procedure AddLineToMemo;
...
end;
procedure Tactivextest.FormCreate(Sender: TObject);
begin
TCPClient.Host := 'localhost';
TCPClient.Port := 31000;
try
TCPClient.Connect;
except
on E: Exception do
begin
MessageBox(0, 'Cannot connect to server!', 'Error', MB_OK);
raise;
end;
end;
end;
// TTimer OnTimer event handler
procedure Tactivextest.Timer1Timer(Sender: TObject);
begin
// needed for TThread.Synchronize() to work in a DLL...
CheckSynchronize;
end;
procedure Tactivextest.TCPClientConnected(Sender: TObject);
begin
ClientThread := TClientThread.Create(False);
end;
procedure Tactivextest.UpdatePanel;
begin
Panel1.Caption := 'connect ' + namewithicon + ')';
end;
procedure Tactivextest.AddLineToMemo;
begin
Memo1.Lines.Add(LineToAdd);
end;
procedure Tactivextest.ProcessCommands(Command: string);
var
Params: array [1 .. 10] of String;
ParamsCount, P: Integer;
PackedParams: TPackedParams;
IdBytes: TIdBytes;
Ms: TMemoryStream;
ReceiveParams, ReceiveStream: Boolean;
Size: Int64;
begin
ReceiveParams := False;
ReceiveStream := False;
Ms := TMemoryStream.Create;
try
case Command[1] of
'1': // command with params
begin
Command := Copy(Command, 2, MaxInt);
ReceiveParams := True;
end;
'2': // command + stream
begin
Command := Copy(Command, 2, MaxInt);
ReceiveStream := True;
end;
'3': // command with params + stream
begin
Command := Copy(Command, 2, MaxInt);
ReceiveParams := True;
ReceiveStream := True;
end;
end;
if ReceiveParams then // params incoming
begin
TCPClient.Socket.ReadBytes(IdBytes, SizeOf(PackedParams), False);
BytesToRaw(IdBytes, PackedParams, SizeOf(PackedParams));
ParamsCount := 0;
repeat
Inc(ParamsCount);
P := Pos(Sep, String(PackedParams.Params));
Params[ParamsCount] := Copy(String(PackedParams.Params), 1, P - 1);
Delete(PackedParams.Params, 1, P + 4);
until (PackedParams.Params = '') or (ParamsCount = 10);
end;
if ReceiveStream then // stream incoming
begin
Size := TCPClient.Socket.ReadInt64;
if Size > 0 then
begin
TCPClient.Socket.ReadStream(Ms, Size, False);
Ms.Position := 0;
end;
end;
if Command = 'SIMPLEMESSAGE' then
begin
MessageBox(0, PChar(Params[1]), 'Message', MB_OK);
end
else if Command = 'INVALIDPASSWORD' then
begin
TCPClient.Disconnect;
MessageBox(0, 'Invalid password!', 'Error', MB_OK);
end
else if Command = 'SENDYOURINFO' then // successfully logged in
begin
UniqueID := StrToInt(Params[1]);
TThread.Synchronize(nil, UpdatePanel);
SendCommandWithParams(TCPClient, 'TAKEMYINFO', namewithicon + Sep);
end
else if Command = 'DISCONNECTED' then
begin
TCPClient.Disconnect;
end
else if Command = 'TEXTMESSAGE' then
begin
LineToAdd := Params[1] + ' : ' + Params[2];
TThread.Synchronize(nil, AddLineToMemo);
end;
finally
Ms.Free;
end;
end;
initialization
TActiveFormFactory.Create(
ComServer,
TActiveFormControl,
Tactivextest,
Class_activextest,
0,
'',
OLEMISC_SIMPLEFRAME or OLEMISC_ACTSLIKELABEL,
tmApartment);
end.
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