连接DLL后的QT5.4错误

Question

我对这里一无所知。我想问一下错误在哪里。我创建了自己的dll (通过代码库)，我想在另一个qt项目中使用它--我设置和执行qmake的所有内容，但它仍然抛出了LNK2019和LNK1120。我附上一个代码库和qt项目。

dll6.dll

main.h

using namespace std;
#ifdef BUILD_DLL
    #define DLL_EXPORT __declspec(dllexport)
#else
    #define DLL_EXPORT __declspec(dllimport)
#endif


#ifdef __cplusplus

#endif

DLL_EXPORT void SomeFunction(const LPCSTR sometext);
DLL_EXPORT int text_pozdrav(int i);

#ifdef __cplusplus

#endif

#endif // __MAIN_H__

main.cpp

DLL_EXPORT int text_pozdrav(int i)
{
    return i;
}

usingdll3(QT)使用

#-------------------------------------------------
#
# Project created by QtCreator 2015-02-06T13:47:38
#
#-------------------------------------------------

QT       += core

QT       -= gui

TARGET = usingdll3
CONFIG   += console
CONFIG   -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

HEADERS += \../dll6/main.h

win32:CONFIG(release, debug|release): LIBS += -L$$PWD/../dll6/bin/Debug/libdll6.a
else:win32:CONFIG(debug, debug|release): LIBS += -L$$PWD/../dll6/bin/Debug/libdll6.a
else:unix: LIBS += -L$$PWD/../dll6/bin/Debug/ -adll6

LIBS += -LC:/Users/Jakub/Documents/Projekty/dll6/bin/Debug/dll6.dll

INCLUDEPATH += $$PWD/../dll6/bin/Debug
DEPENDPATH += $$PWD/../dll6/bin/Debug

main.cpp

#include <QCoreApplication>
#include <iostream>
#include <Windows.h>
#include <stdio.h>
#include "main.h"


using namespace std;
DLL_EXPORT int text_pozdrav(int i);

int main(int argc, char *argv[])
{    
    QCoreApplication a(argc, argv);
    cout << text_pozdrav(22) << endl;

    return a.exec();

}

误差

LNK2019: main.obj:-1: Chyba: LNK2019: unresolved external symbol "__declspec(dllimport) int __cdecl text_pozdrav(int)" (__imp_?text_pozdrav@@YAHH@Z) referenced in function _main
LNK1120: debug\usingdll3.exe:-1: Chyba: LNK1120: 1 unresolved externals

谢谢你的回答

Answer 1

在VisualC++中编译gcc和qt的解析代码块