Qtcreator 編譯靜態庫並使用

靜態庫的編譯

• 參照https://blog.csdn.net/qq_37468954/article/details/76537829建立靜態庫項目
• 測試代碼如下
• 保存並編譯就會在Debug文件夾下生成.o和.a兩個文件，.a就是得到的靜態庫文件

//.pro文件
#-------------------------------------------------
#
# Project created by QtCreator 2018-08-10T09:46:45
#
#-------------------------------------------------

QT       -= gui

TARGET = buildlibtest
TEMPLATE = lib
CONFIG += staticlib

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). 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 if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
        buildlibtest.cpp

HEADERS += \
        buildlibtest.h
unix {
    target.path = /usr/lib
    INSTALLS += target
}

//頭文件
#ifndef BUILDLIBTEST_H
#define BUILDLIBTEST_H


class Buildlibtest
{

public:
    Buildlibtest();
    int add(int num1,int num2);
};

#endif // BUILDLIBTEST_H

//源代碼
#include "buildlibtest.h"
Buildlibtest::Buildlibtest()
{
}
int Buildlibtest::add(int num1,int num2){
    return (num1+num2);
}

靜態庫的使用

• 說明：我查詢的博客對於靜態庫的使用都是一筆帶過，但是對於我這各小白還是折騰了許久，下面就簡要說明一下
• 將上面得到的.a靜態庫，和原來的.h頭文件（共兩個）放入新創建的文件夾中
• 新建項目，將靜態庫和頭文件導入
• 按照上面博客將靜態庫導入文檔時要注意不要“對爲debug版本添加“d”作爲後綴”和這個選項打勾（本人就是因爲這一項打了勾，半天運行不了）
  
• 測試代碼
  

#-------------------------------------------------
#
# Project created by QtCreator 2018-08-10T10:23:55
#
#-------------------------------------------------

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = testlib
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). 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 if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0


SOURCES += \
        main.cpp \
        mainwindow.cpp

HEADERS += \
        mainwindow.h \
    buildlibtest.h

win32: LIBS += -L$$PWD/./ -lbuildlibtest

INCLUDEPATH += $$PWD/.
DEPENDPATH += $$PWD/.

win32:!win32-g++: PRE_TARGETDEPS += $$PWD/./buildlibtest.lib
else:win32-g++: PRE_TARGETDEPS += $$PWD/./libbuildlibtest.a

}

#ifndef BUILDLIBTEST_H
#define BUILDLIBTEST_H


class Buildlibtest
{

public:
    Buildlibtest();
    int add(int num1,int num2);
};

#endif // BUILDLIBTEST_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include "buildlibtest.h"
#include <QDebug>
class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
};

#endif // MAINWINDOW_H

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    Buildlibtest obj;
    qDebug()<<obj.add(1,5);
}

MainWindow::~MainWindow()
{

}