Me directly post code, facilitate everybody correct, first posted on the DLL project code, documents the following

 # # ifndef UNTITLED36_H 
# define UNTITLED36_H 

# include "untitled36_global. H" 
# include "QTimer 
"
The class UNTITLED36SHARED_EXPORT Untitled36: public QObject 
{
Q_OBJECT 
Public: 
Untitled36 (); 
QTimer * t; 

Void init (); 

Public slots: 
Void test (); 
}; 

# endif//UNTITLED36_H 

 # include "untitled36. H" 
# include "QDebug 
"
Untitled36: : Untitled36 () 
{

} 

Void Untitled36: : init () 
{
T=new QTimer (this); 
T - & gt; Start (1000); 
The connect (t, SIGNAL (timeout ()), t, SLOT (test ())); 
} 

Void Untitled36: : test () 
{
QDebug () & lt; & lt;" Test "; 
} 

Pro file

 # -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
# 
# the Project created by QtCreator T16 2017-04-14: not 
# 
# -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

QT GUI -=
QT +=network widgets 

TARGET=untitled36 
The TEMPLATE=lib 

DEFINES +=UNTITLED36_LIBRARY 

# The following define top service your compiler emit warnings if you use The 
# any feature of Qt which as had been marked as deprecated (the exact warnings 
# depend on your compiler). Both Please consult the documentation of the 
# deprecated API in order to know how to port your code away from it. 
DEFINES +=QT_DEPRECATED_WARNINGS 

# You can also make your code fail to compile the if You use deprecated APIs. 
# In order to do so, uncomment the following line. 
# You can also select the to disable deprecated APIs only up to a certain version of Qt. 
# # DEFINES +=QT_DISABLE_DEPRECATED_BEFORE=0 x060000 disables all the APIs deprecated before Qt 6.0.0 

SOURCES +=untitled36. CPP 

HEADERS +=untitled36. H \ 
Untitled36_global. H 

Unix {
Target. The path=/usr/lib 
INSTALLS +=target 
} 

 # # ifndef UNTITLED36_GLOBAL_H 
# define UNTITLED36_GLOBAL_H 

#include  

# if defined (UNTITLED36_LIBRARY) 
# define UNTITLED36SHARED_EXPORT Q_DECL_EXPORT 
# the else 
# define UNTITLED36SHARED_EXPORT Q_DECL_IMPORT 
# endif 

# endif//UNTITLED36_GLOBAL_H 

Next is to call a small demo

 # include "mainwindow. H" 
#include  

Int main (int arg c, char * argv []) 
{
QApplication a (arg c, argv); 
The MainWindow w; 
Baron how (); 

Return a.e xec (); 
} 

 # # ifndef MAINWINDOW_H 
# define MAINWINDOW_H 

#include  
# include "untitled36. H" 

The namespace Ui {
The class MainWindow. 
} 

The class MainWindow: public QMainWindow 
{
Q_OBJECT 

Public: 
Explicit MainWindow (QWidget * parent=0); 
~ MainWindow (); 


Private: 
Ui: : MainWindow * Ui; 
}; 

# endif//MAINWINDOW_H 

 # include "mainwindow. H" 
# include "ui_mainwindow. H" 

MainWindow: : MainWindow (QWidget * parent) : 
QMainWindow (parent), 
UI (new UI: : MainWindow) 
{
The UI - & gt; SetupUi (this); 
Untitled36 * U; 
U - & gt; init(); 
} 

MainWindow: : ~ MainWindow () 
{
Delete the UI; 
} 

 # -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
# 
# the Project created by QtCreator T10:2017-03-23 fortified 
# 
# -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

QT +=core GUI network 

GreaterThan (QT_MAJOR_VERSION, 4) : QT +=widgets XML 

TARGET=LoadDll 
The TEMPLATE=app 

# The following define top service your compiler emit warnings if you use The 
# any feature of Qt which as had been marked as deprecated (the exact warnings 
# depend on your compiler). Both Please consult the documentation of the 
# deprecated API in order to know how to port your code away from it. 
DEFINES +=QT_DEPRECATED_WARNINGS 

# You can also make your code fail to compile the if You use deprecated APIs. 
# In order to do so, uncomment the following line. 
# You can also select the to disable deprecated APIs only up to a certain version of Qt. 
# # DEFINES +=QT_DISABLE_DEPRECATED_BEFORE=0 x060000 disables all the APIs deprecated before Qt 6.0.0 


+=the main SOURCES. The CPP \ 
Mainwindow. CPP 

HEADERS +=mainwindow. H 

FORMS +=mainwindow. UI 

LIBS +=D:/Qt/Documents/build - untitled36 - Desktop_Qt_5_8_0_MinGW_32bit - Debug/Debug/untitled36 DLL 

INCLUDEPATH +=D:/Qt/Documents/untitled36/

It's all here, the problem is run, direct stopped running, debugging time errors as follows

CodePudding user response:

Can see is a pointer, but the specific how to produce, I don't know much about the principle and requests

CodePudding user response:

Untitled36 * U; To Untitled36 * U=new Untitled36 (this);