Question

我正在尝试编译“ Hello World！” Qt的应用程序但在编译时出现以下错误：‘class QApplication’ has no member named ‘setMainWidget’，但我不确定为什么，我的源文件如下：

/****************************************************************
**
** Qt tutorial 1
**
****************************************************************/

#include <qapplication.h>
#include <qpushbutton.h>


int main( int argc, char **argv )
{
    QApplication a( argc, argv );

    QPushButton hello( "Hello world!", 0 );
    hello.resize( 100, 30 );

    a.setMainWidget( &hello );
    hello.show();
    return a.exec();
}

然后我使用以下CMakeLists.txt用cmake创建了Makefile：

cmake_minimum_required(VERSION 3.1.0)

project(hello_world)

# Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed
set(CMAKE_AUTOMOC ON)
# Create code from a list of Qt designer ui files
#set(CMAKE_AUTOUIC ON)

# Find the QtWidgets library
find_package(Qt5 COMPONENTS Widgets REQUIRED)

# Populate a CMake variable with the sources
set(hello_world_SRCS
            main.cpp
            )
# Tell CMake to create the helloworld executable
add_executable(hello_world WIN32 ${hello_world_SRCS})
# Use the Widgets module from Qt 5
target_link_libraries(hello_world Qt5::Widgets)

我在做什么错了？

“ QApplication类”没有名为“ setMainWidget”的成员

0 个答案: