qmake不添加小部件 [英] qmake does not add widgets

问题描述

我有一个简单的程序。我的程序是：

  #include< QApplication> 
 #include< QLabel> 
 
 int main（int argc，char * argv []）
 {
 int rc; 
 QApplication app（argc，argv）; 
 QLabel * label = new QLabel（Hello Qt！）; 
 label-> show（）; 
 rc = app.exec（）; 
 return（rc）; 
} 
  

我想在命令行中编译和构建这个代码。
i已安装qt和mingw。

首先我的命令是：

  qmake -project 
  

然后我输入此命令。

  qmake 
  

pro文件是：

  TEMPLATE = app 
 TARGET = HELLO 
 INCLUDEPATH + =。 
 
＃输入
 SOURCES + = hello.cpp 
  

i认为这个文件必须inclue'QT + = widgets'，但它doesnt。我不知道为什么。
最后，我调用mingw make

并且它给出错误。

文件QT + = widgets然后调用mingw-make，它工作和创建.exe文件。

然后我的问题是，为什么qmake自动添加 QT + = widgets ，我该怎么做呢？我不想手动添加。

解决方案

我该怎么做？我不想手动添加。

您可以执行以下操作：

2）qmake -projectQT + = widgets

$ p b $ b

但没有更多。

此外，请注意，您可以使用 greaterThan（QT_MAJOR_VERSION，4）：QT + = widgets 与Qt 4兼容，如果这对你很重要，因为小部件在gui模块中的Qt 4和core和gui默认添加。他们被放入自己的小部件模块在Qt 5。

i have a simple program. my program is:

 #include <QApplication>
 #include <QLabel>

 int main(int argc, char *argv[])
{
 int rc ; 
    QApplication app(argc, argv);  
     QLabel *label = new QLabel("Hello Qt!");
    label->show();
     rc = app.exec();
     return(rc) ;
}

i want to compile and build this code in command line. i have installed qt and mingw.

first my command is:

  qmake -project

then i give this command.

  qmake

then qmake creates .pro file which is:

 TEMPLATE = app
 TARGET = HELLO
 INCLUDEPATH += .

 # Input
 SOURCES += hello.cpp

i think this file must inclue ' QT += widgets' but it doesnt. i dont know why. finally, i call mingw make

and it gives error.

when i add .pro file QT += widgets then call mingw-make, it works and creates .exe file.

then my question is that, why qmake automatically add QT += widgets , how can i do this? i dont want to add manually.

解决方案

how can i do this? i dont want to add manually.

You can do the following things:

1) You could use QtCreator and select the widget based application.

2) qmake -project "QT += widgets"

but nothing more. QMake is not a C++ code project parser.

Also, note that you could use greaterThan(QT_MAJOR_VERSION, 4):QT+=widgets to be compatible with Qt 4 if that matters for you since the widgets were in the gui module for Qt 4 and core and gui are added by default. They were put into their own widgets module in Qt 5.

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