QT 服务器和客户端 连接不上
本帖最后由 djdgf4 于 2024-8-27 21:05 编辑初学QT，写了个服务/客户端，但是怎么都连接不上
在connectToServer判断的时候没有输出，直接跳出去了，然后就是断连。在程序启动的时候就是表现为，服务端初始化完成，服务启动，然后客户端启动，但是连接不上。
我尝试使用telnet用两个终端各自连接服务器：
(base) Popen 127.0.0.1 1234sssssss> telnet
telnet> open 127.0.0.1 1234
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'
. (WechatMSG) PS D:\GitClone\WeChatMsg> telnet
telnet> open 127.0.0.1 1234
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
1
并且发送消息，但是没有其他反应，也无法显示客户端id，显然client没有来连接上
(base) PS C:\Users\Theonesssssssss> telnet
telnet> open 127.0.0.1 12345
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
服务端存在Server: started.字样，但是没有Client connected: 输出使用client.exe程序的时候，点击connect没有反应，点击disconnect会在client界面出现Disconnected from server. Attempting to reconnect...
我客户端的出错位置的逻辑是
void TCPClient::connectToServer()
{
qDebug() << "Attempting to connect to server...";
socket->connectToHost("127.0.0.1", 1234);// 连接到本地主机的1234端口
if (socket->waitForConnected(3000)) {
displayArea->append("Connected to server.");
} else {
displayArea->append("Failed to connect to server. Error: " + socket->errorString());
}
}
void TCPClient::onConnectClicked()
{
qDebug() << "Connect button clicked.";
connectToServer();// 连接到服务器
}
https://www.52pojie.cn/forum.php?mod=image&aid=2719862&size=300x300&key=939ed1f6ce48b865&nocache=yes&type=fixnone&ramdom=JpdM5
我是直接使用qmake编译的，因为不太会建立QT工程
make clean && qmake client.pro && make -k
make clean && qmake server.pro && make -k
(base) PS C:\Users\Theonesssssssss> Get-NetTCPConnection -LocalPort 1234
LocalAddress LocalPort RemoteAddress RemotePort State AppliedSetting OwningProcess
------------ --------- ------------- ---------- ----- -------------- -------------
:: 1234 :: 0 Listen 12708
127.0.0.1 1234 127.0.0.1 59759 Established Internet 11812
127.0.0.1 1234 0.0.0.0 0 Listen 11812
附上代码
client.rar || https://前缀1drv.ms/u/s!AuA35fjcaGBNiHmBQGwfyNF-EFSR?e=uOYMRx
server.rar ||1drv.ms/u/s!AuA35fjcaGBNiHpiRDVRG0z4pP0U?e=dDwn9P
这里是我的调试信息，(Theonesssssssss@Stein-Gate) ~/TCP/tcp1 - Copy (2)/client % gdb debug/./client.exe
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Reading symbols from debug/./client.exe...
(gdb) b connectToServer
Breakpoint 1 at 0x140001d3c: file client.cpp, line 50.
(gdb) r
Starting program: D:\msys64\home\Theonesssssssss\TCP\tcp1 - Copy (2)\client\debug\client.exe
warning: Connect button clicked.
Thread 1 hit Breakpoint 1, TCPClient::connectToServer (this=0x5ffd80) at client.cpp:50
warning: Source file is more recent than executable.
50 qDebug() << "Attempting to connect to server...";
(gdb) l 47,64
47
48 void TCPClient::connectToServer()
49 {
50 qDebug() << "Attempting to connect to server...";
51 socket->connectToHost("127.0.0.1", 1234);// 杩炴帴鍒版湰鍦颁富鏈虹殑1234 绔彛
52 if (socket->waitForConnected(3000)) {
53 displayArea->append("Connected to server.");
54 } else {
55 displayArea->append("Failed to connect to server. Error: " + socket->errorString());
56 }
57 }
58
59 void TCPClient::onConnectClicked()
60 {
61 qDebug() << "Connect button clicked.";
62 connectToServer();// 杩炴帴鍒版湇鍔″櫒
63 }
64
(gdb) n
warning: Attempting to connect to server...
51 socket->connectToHost("127.0.0.1", 1234);// 杩炴帴鍒版湰鍦颁富鏈虹殑1234 绔彛
(gdb) bt
#0TCPClient::connectToServer (this=0x5ffd80) at client.cpp:51
#10x00007ff779101eb8 in TCPClient::onConnectClicked (this=0x5ffd80) at client.cpp:57
#20x00007ff779104899 in QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (TCPClient::*)()>::call(void (TCPClient::*)(), TCPClient*, void**) (
f=(void (TCPClient::*)(TCPClient * const)) 0x7ff779101e46 <TCPClient::onConnectClicked()>, o=0x5ffd80, arg=0x5fbf20)
at D:/msys64/mingw64/include/QtCore/qobjectdefs_impl.h:152
#30x00007ff779104a8c in QtPrivate::FunctionPointer<void (TCPClient::*)()>::call<QtPrivate::List<>, void>(void (TCPClient::*)(), TCPClient*, void**) (
f=(void (TCPClient::*)(TCPClient * const)) 0x7ff779101e46 <TCPClient::onConnectClicked()>, o=0x5ffd80, arg=0x5fbf20)
at D:/msys64/mingw64/include/QtCore/qobjectdefs_impl.h:185
#40x00007ff77910494a in QtPrivate::QSlotObject<void (TCPClient::*)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (which=1,
this_=0xe2dd00, r=0x5ffd80, a=0x5fbf20, ret=0x0)
at D:/msys64/mingw64/include/QtCore/qobjectdefs_impl.h:418
#50x00007ffa0d39257c in ?? () from D:\msys64\mingw64\bin\Qt5Core.dll
#60x00007ffa06b336c2 in ?? () from D:\msys64\mingw64\bin\Qt5Widgets.dll
#70x00007ffa06b352c6 in ?? () from D:\msys64\mingw64\bin\Qt5Widgets.dll
#80x00007ffa06b354bf in ?? () from D:\msys64\mingw64\bin\Qt5Widgets.dll
#90x00007ffa06a88690 in ?? () from D:\msys64\mingw64\bin\Qt5Widgets.dll
#10 0x00007ffa06a4853e in ?? () from D:\msys64\mingw64\bin\Qt5Widgets.dll
#11 0x00007ffa06a5058b in ?? () from D:\msys64\mingw64\bin\Qt5Widgets.dll
#12 0x00007ffa0d2a4298 in ?? () from D:\msys64\mingw64\bin\Qt5Core.dll
#13 0x00007ffa06a4e3ff in ?? () from D:\msys64\mingw64\bin\Qt5Widgets.dll
#14 0x00007ffa06a9f61b in ?? () from D:\msys64\mingw64\bin\Qt5Widgets.dll
#15 0x00007ffa06aa2a07 in ?? () from D:\msys64\mingw64\bin\Qt5Widgets.dll
#16 0x00007ffa06a4853e in ?? () from D:\msys64\mingw64\bin\Qt5Widgets.dll
#17 0x00007ffa0d2a4298 in ?? () from D:\msys64\mingw64\bin\Qt5Core.dll
#18 0x00007ffa04a37bd4 in ?? () from D:\msys64\mingw64\bin\Qt5Gui.dll
#19 0x00007ffa04a0eecc in ?? () from D:\msys64\mingw64\bin\Qt5Gui.dll
#20 0x00007ffa0d300b02 in ?? () from D:\msys64\mingw64\bin\Qt5Core.dll
#21 0x00007ffa0bd44185 in ?? ()
from D:\msys64\mingw64\share\qt5\plugins\platforms\qwindows.dll
#22 0x00007ffa0d2a25a3 in ?? () from D:\msys64\mingw64\bin\Qt5Core.dll
#23 0x00007ffa0d2ab3a5 in ?? () from D:\msys64\mingw64\bin\Qt5Core.dll
#24 0x00007ff7791014a3 in qMain (argc=1, argv=0xf03f80) at main.cpp:9
#25 0x00007ff779103a0f in WinMain ()
#26 0x00007ff7791012e9 in __tmainCRTStartup ()
at C:/M/B/src/mingw-w64/mingw-w64-crt/crt/crtexe.c:258
#27 0x00007ff7791013d6 in WinMainCRTStartup ()
at C:/M/B/src/mingw-w64/mingw-w64-crt/crt/crtexe.c:148
(gdb) n
152 virtual void connectToHost(const QString &hostName, quint16 port, OpenMode mode = ReadWrite, NetworkLayerProtocol protocol = AnyIPProtocol);
(gdb) n
51 socket->connectToHost("127.0.0.1", 1234);// 杩炴帴鍒版湰鍦颁富鏈虹殑1234 绔彛
(gdb) n
warning: onecore\net\netprofiles\service\src\nsp\dll\namespaceserviceprovider.cpp(613)\nlansp_c.dll!00007FFAB782F6BD: (caller: 00007FFAE0CEACF6) LogHr(1) tid(968) 8007277C No such service is known. The service cannot be found in the specified name space.
52 if (socket->waitForConnected(3000)) {
(gdb) n
TCPClient::onConnectClicked (this=0x5ffd80) at client.cpp:58
58
(gdb) n
QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (TCPClient::*)()>::call(void (TCPClient::*)(), TCPClient*, void**) (
f=(void (TCPClient::*)(TCPClient * const)) 0x7ff779101e46 <TCPClient::onConnectClicked()>, o=0x5ffd80, arg=0x5fbf20)
at D:/msys64/mingw64/include/QtCore/qobjectdefs_impl.h:153
153 }
(gdb) n
QtPrivate::FunctionPointer<void (TCPClient::*)()>::call<QtPrivate::List<>, void>(void (TCPClient::*)(), TCPClient*, void**) (
f=(void (TCPClient::*)(TCPClient * const)) 0x7ff779101e46 <TCPClient::onConnectClicked()>, o=0x5ffd80, arg=0x5fbf20)
at D:/msys64/mingw64/include/QtCore/qobjectdefs_impl.h:186
186 }
(gdb) n
QtPrivate::QSlotObject<void (TCPClient::*)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) (which=1, this_=0xe2dd00,
r=0x5ffd80, a=0x5fbf20, ret=0x0)
at D:/msys64/mingw64/include/QtCore/qobjectdefs_impl.h:419
419 break;
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) n
Program not restarted.
(gdb) n
425 }
(gdb) l
420 case Compare:
421 *ret = *reinterpret_cast<Func *>(a) == static_cast<QSlotObject*>(this_)->function;
422 break;
423 case NumOperations: ;
424 }
425 }
426 public:
427 explicit QSlotObject(Func f) : QSlotObjectBase(&impl), function(f) {}
428 };
429 // implementation of QSlotObjectBase for which the slot is a functor (or lambda)
这里可以看到直接跳出来了
Run till exit from #00x00007ffa0bd44185 in ?? ()
from D:\msys64\mingw64\share\qt5\plugins\platforms\qwindows.dll
0x00007ffa0d2a25a3 in ?? () from D:\msys64\mingw64\bin\Qt5Core.dll
(gdb) finish
Run till exit from #00x00007ffa0d2a25a3 in ?? ()
from D:\msys64\mingw64\bin\Qt5Core.dll
warning: Disconnect button clicked.
warning: Disconnected from server. Attempting to reconnect...
warning: Disconnect button clicked.
下一个调试工具，用调试工具分别当做服务器、客户端和你的客户端、服务器连接，看看是哪的问题。服务器开启端口监听了没有？Qt Creator 里有tcp通讯的实例，你可以看看官方例子。 防火墙？ ZoRoLOVE 发表于 2024-8-26 06:24
下一个调试工具，用调试工具分别当做服务器、客户端和你的客户端、服务器连接，看看是哪的问题。服务器开启 ...
我用了Ai写了个脚本开启防火墙和端口监听，但是，结果是相同的。
然后我尝试用Wireshark捕获，问了ai是以
> > 运行你的服务器和客户端：
>
> 在捕获进行时，启动你的服务器和客户端。可以使用你编写的程序，或者使用 netcat 来创建一个简单的服务器和客户端连接。例如：
> 在一个终端中作为服务器监听：
>
> bash
>
> nc -l 127.0.0.1 1234
>
> 在另一个终端中作为客户端连接：
>
> bash
>
> nc 127.0.0.1 1234
>
> 发送和接收一些消息来生成流量。
但是发现这样获得的好像是两个终端之间的流量，我开不开服务器都不影响。不太懂网络这块，不知道怎么排查
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