【QT】QTimer连接槽时报错：error: static assertion failed: Signal and slot arguments are not compatible.

编译错误

/usr/include/x86_64-linux-gnu/qt5/QtCore/qobject.h:314: error: static assertion failed: Signal and slot arguments are not compatible.
  314 |         Q_STATIC_ASSERT_X((FunctorArgumentCount >= 0),
      |         ^~~~~~~~~~~~~~~~~

/usr/include/x86_64-linux-gnu/qt5/QtCore/qobjectdefs_impl.h:367: error: request for member ‘operator()’ in ‘QtPrivate::FunctorReturnType >::dummy()’, which is of non-class type ‘const char*’
  367 |         typedef decltype(dummy().operator()((dummy())...)) Value;
      |                          ~~~~~~~~~~~~~~~~~~~~~~~~~~^

错误原因：

信号和插槽参数不兼容。

通俗的说，就是信号用的一种形式（如&QTimer::），槽用了另一种形式连接（SLOT）。

修改前：

connect(&timer,&QTimer::timeout,this,SLOT(timeout()));

修改后：

connect(&timer,&QTimer::timeout,this,&Http::timeout);

再次编译，错误就没有了