Question

我想在Qt创建者中使用DELAYLOAD标志。这是解释我的问题的最小代码：在pro文件中：

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = DelayLoad
TEMPLATE = app
CONFIG+=qwt

SOURCES += main.cpp\
    mainwindow.cpp

HEADERS  += mainwindow.h

win32: LIBS += -L$$PWD/../../../../../qwt-6.1.2/lib/ -lqwt
INCLUDEPATH += $$PWD/../../../../../qwt-6.1.2/include
DEPENDPATH += $$PWD/../../../../../qwt-6.1.2/include

win32: QMAKE_LFLAGS_RELEASE += /DELAYLOAD:qwt.dll

在mainwindow.cpp：

#include "mainwindow.h"
#include <QPushButton>
#include "qwt_plot.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    QPushButton *button = new QPushButton("replace by plot");
    connect(button, SIGNAL(clicked(bool)),this,SLOT(buttonClicked()));
    this->setCentralWidget(button);
}

MainWindow::~MainWindow()
{
}

void MainWindow::buttonClicked()
{
    QwtPlot *plot = new QwtPlot();
    this->setCentralWidget(plot);
}

这会出现以下错误： qwt.lib(qwt.dll):-1: error: LNK2001: unresolved external symbol __delayLoadHelper2

我点击了Run qmake，Clear，Rebuild上的几个。这并不能解决最初的问题。我正在使用Qt 5.4.2＆＃39;使用MSVC 2013 64 bit编译器

Answer 1

将以下行添加到.pro文件中。

win32:LIBS += "-LC:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\lib\amd64" -ldelayimp

DELAYLOAD在Qt中给出链接错误

1 个答案: