debug模式下體積過大的話，選擇release編譯會縮小很大一部分體積。

選擇創(chuàng)建qt庫項目，根據(jù)提示選擇相應(yīng)配置：

Type：Shared Libray；Statically linked Library；QT Plugin

Class name:dlllibtest

QT module:None;Core;Gui;Widgets（對于一般函數(shù)不引用qt庫的話封裝經(jīng)測試選擇None和Core一樣的效果包括生成的dll大小等）

Head file:默認為類名.h（可改）

Sorce file：默認為類名.cpp(可改）

配置好后會自動生成3個文件，可以按如下所示編寫dll代碼

1.pro文件

QT -= gui

TEMPLATE = lib
DEFINES += DLLLIBTEST_LIBRARY

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked 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 it uses 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 += \
? ? dlllibtest.cpp

HEADERS += \
? ? DllLibTest_global.h \
? ? dlllibtest.h

# Default rules for deployment.
unix {
? ? target.path = /usr/lib
}
!isEmpty(target.path): INSTALLS += target
2._global.h文件（將此文件里的聲名復(fù)制到實現(xiàn)的頭文件中，QT module:None;Core兩種模式下內(nèi)容有些差別但復(fù)制方式類似）

#ifndef DLLLIBTEST_GLOBAL_H
#define DLLLIBTEST_GLOBAL_H

#include <QtCore/qglobal.h>

#if defined(DLLLIBTEST_LIBRARY)
# ?define DLLLIBTEST_EXPORT Q_DECL_EXPORT
#else
# ?define DLLLIBTEST_EXPORT Q_DECL_IMPORT
#endif

#endif // DLLLIBTEST_GLOBAL_H
3.dlllibtest.h文件

#ifndef DLLLIBTEST_H
#define DLLLIBTEST_H

#include "DllLibTest_global.h"

#if defined(DLLLIBTEST_LIBRARY)
# ?define DLLLIBTEST_EXPORT Q_DECL_EXPORT
#else
# ?define DLLLIBTEST_EXPORT Q_DECL_IMPORT
#endif
extern "C"{
DLLLIBTEST_EXPORT int Sum(int a,int b);

extern "C" class ?DLLLIBTEST_EXPORT ?DllLibTest
{
public:
? ? DllLibTest();
};

DLLLIBTEST_EXPORT int Sum2(int a,int b);
}

#endif // DLLLIBTEST_H
4.dlllibtest.cpp文件

#include "dlllibtest.h"

DllLibTest::DllLibTest()
{

}
?int Sum(int a,int b)
{
? ? return ?a+b;
}
?int Sum2(int a,int b)
{
? ? return ?a+b;
}
?

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