QT elementary notes

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function

ctrl+r

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ctrl+i

compile

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The same name .h/.cpp Switch

F4

Header file declaration

#pragma once

Common macros in classes

Use Q_OBJECT macro , Allow classes to use signal and slot mechanisms

Pro file

QT engineering pro File template variables （TEMPLATE）

“app” Templates

“app” Template tell qmake Generate a... For building an application makefile. When using this template , Below these qmake System variables are recognized . You should be in your .pro Use them in files to specify specific information for your application .

“lib” Templates

“lib” Template tell qmake To create a library makefile. When using this template , except “app” System variables are mentioned in the template , One more VERSION Is supported by . You need to specify specific information for the library .pro Use them in files .

“subdirs” Templates

“subdirs” Template tell qmake Generate a makefile, It can go to a specific subdirectory and generate... For the project files in that directory makefile And call... For it make.

There is only one system variable in this template SUBDIRS Can be identified . This variable contains the list of subdirectories containing project files to be processed . The name of this project file is the same as the subdirectory , such qmake You can find it . for example , If it's in the subhead “myapp”, So the project file in this directory should be called myapp.pro.

CONFIG Variable

pro The variable of the directory where the file is located

• Variable _PRO_FILE_PWD_ Can be said Qt In the project pro File directory .

TARGET

Generate exe The name of

SOURCES

Add source file

HEADERS

Header file

Button

#include "QPushButton"

```c
// Create a button 
QPushButton* btn =new QPushButton();
// Give Way btn Objects depend on Widget
btn->setParent(this);
// Set button text 
btn->setText("Btn1");

QPushButton* btn2=new QPushButton("Btn2",this);
// Reset window size 
this->resize(600,400);
// Move Btn2
btn2->move(100,100);
// Set the window title 
this->setWindowTitle("Hello Qt");
// Set window fixed size 
this->setFixedSize(600,400);

#  Two 、 Use steps 
## 1. Import and stock in 




#  Reference documents 
[QT engineering pro file TEMPLATE Variable description ](https://blog.csdn.net/qinpanke/article/details/22199271)