多个定义错误:一个在我的文件中，一个在moc文件中. [英] Multiple definitions error: one in my file and one in the moc file.

问题描述

我有一个名为FindAndReplaceBar的类，其实现是这样的:

I have a class called FindAndReplaceBar, whose implementation is this:

#include "FindAndReplaceBar.h"
#include <QLabel>
#include <QPushButton>
#include <QGridLayout>
#include <QTextDocument>
#include <QLineEdit>

FindAndReplaceBar::FindAndReplaceBar(QObject *parent) :
    QToolBar(NULL)
{
    lblFind         = new QLabel("Find: ",this);
    lblReplace      = new QLabel("Replace",this);

    ledtFind        = new QLineEdit(this);
    ledtReplace     = new QLineEdit(this);

    QPixmap next(":/res/resources/next.gif");
    QPixmap previous(":/res/resources/previous.gif");
    QPixmap close(":/res/resources/close_icon.gif");

    btnFindNext     = new QPushButton(QIcon(next),"",this);
    btnFindPrevious = new QPushButton(QIcon(previous),"",this);
    btnClose        = new QPushButton(QIcon(close),"",this);

    btnReplace      = new QPushButton("Replace",this);
    btnReplaceAll   = new QPushButton("Replace All",this);

    btnFindNext->setFlat(true);
    btnFindPrevious->setFlat(true);
    btnClose->setFlat(true);
    btnReplace->setFlat(true);
    btnReplaceAll->setFlat(true);

    lytFindAndReplaceBar        = new QGridLayout(this);

    lytFindAndReplaceBar->addWidget(lblFind,0,0,1,1);
    lytFindAndReplaceBar->addWidget(ledtFind,0,1,1,2);
    lytFindAndReplaceBar->addWidget(btnFindPrevious,0,3,1,1);
    lytFindAndReplaceBar->addWidget(btnFindNext,0,4,1,1);

    lytFindAndReplaceBar->addWidget(lblReplace,0,5,1,1);
    lytFindAndReplaceBar->addWidget(ledtReplace,0,6,1,2);
    lytFindAndReplaceBar->addWidget(btnReplace,0,8,1,1);
    lytFindAndReplaceBar->addWidget(btnReplaceAll,0,9,1,1);

    this->setLayout(lytFindAndReplaceBar);

    connect(btnFindNext,SIGNAL(clicked()),this,SIGNAL(findNext()));
    connect(btnFindPrevious,SIGNAL(pressed()),this,SIGNAL(findPrevious()));
    connect(btnClose,SIGNAL(pressed()),this,SLOT(close()));
    connect(btnReplace,SIGNAL(pressed()),this,SIGNAL(replace()));
    connect(btnReplaceAll,SIGNAL(pressed()),this,SIGNAL(replaceAll()));

    this->setStyleSheet("QToolBar{background: qlineargradient(x1:0,x2:0,y1:0,y2:1,stop:0 #fffaf0,stop:0.3 #fdf5e6)} QLineEdit{border-radius:4px;padding:2px;}");
}

void FindAndReplaceBar::findNext()
{
    emit find(0);
}

void FindAndReplaceBar::findPrevious()
{
    emit find(QTextDocument::FindBackward);
}

void FindAndReplaceBar::replace()
{
    emit replace(false);
}

void FindAndReplaceBar::replaceAll()
{
    emit replace(true);
}

QString FindAndReplaceBar::searchTerm()
{
    return this->ledtFind->text();
}

QString FindAndReplaceBar::replaceTerm()
{
    return this->ledtReplace->text();
}

void FindAndReplaceBar::setSearchFieldText(const QString & searchFieldText)
{
    this->ledtFind->setText(searchFieldText);
}

void FindAndReplaceBar::setReplaceFieldText(const QString & replaceFieldText)
{
    this->ledtReplace->setText(replaceFieldText);
}

运行程序时，我遇到了多个函数定义的问题:

When I run the program I get problems of multiple definitions of the functions:

findNext()，findPrevious()，replace()，replaceAll().

另一个定义在moc_FindAndReplaceBar.cpp文件中进行. 我不确定是什么问题，所以我不知道如何解决！我真的很感谢您的帮助，谢谢！

The other definition is made in the moc_FindAndReplaceBar.cpp file. I'm not sure what the problem so I don't know how to fix it! I would really appreciate any help, thanks!

推荐答案

从您的连接调用(信号到信号)判断，假设我们查看您的头文件，则您将findNext(), findPrevious(), replace(), replaceAll()声明为信号，但是您不能实现信号-只需在标头中声明它们即可.

Judging by your connect calls (signal to signal), I assume if we look at your header file, you will have declared findNext(), findPrevious(), replace(), replaceAll() as signals, but you must not implement signals - they just need to be declared in the header.

从信号

信号是由Moc自动生成的，一定不能 在.cpp文件中实现.它们永远不能具有返回类型(即 使用void).

Signals are automatically generated by the moc and must not be implemented in the .cpp file. They can never have return types (i.e. use void).

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