errors

[manu]

Alright so here is my simple code...

header.cpp

#include<QLabel>
#include<QPushButton>
#include<QVBoxLayout>
#include<QCheckBox>
#include<QLineEdit>
 
#include"header.h"
 
 
widg::widg(QWidget *parent)
: QWidget(parent)
{
 
	label = new QLabel(tr("Find What"));
	line = new QLineEdit;
	label->setBuddy(line);
 
	close = new QPushButton(tr("Close"));
	close->resize(50,30);
 
	find = new QPushButton(tr("Find"));
	find->resize(50,30);
	find->setEnabled(false);
	find->setDefault(true);
 
	casechk = new QCheckBox(tr("Case Sensitive"));
	back = new QCheckBox(tr("Backward Search"));
 
	connect(close,SIGNAL(clicked()),this,SLOT(quit()));
	connect(line,SIGNAL(textChanged(const QString &)),this,SLOT(enableFind(const QString &)));
	connect(find,SIGNAL(clicked()),this,SLOT(findClicked()));
 
	QVBoxLayout *lay= new QVBoxLayout;
	lay->addWidget(label);
	lay->addWidget(line);
	lay->addWidget(casechk);
	lay->addWidget(back);
	lay->addWidget(find);
	lay->addWidget(close);
	setLayout(lay);
 
}
 
void widg::findClicked() 
{
	QString text = line->text();
 
	Qt::CaseSensitivity ct = casechk->isChecked() ? Qt::CaseSensitive : Qt::CaseInsensitive;
 
	if(back->isChecked())
	{
		emit findprev(text, ct);
	}
	else
	{
		emit findnext(text, ct);
	}
}
 
void widg::enableFind(const QString &text)
{
	find->setEnabled(true);
}

#include<QLabel>
#include<QPushButton>
#include<QVBoxLayout>
#include<QCheckBox>
#include<QLineEdit>

#include"header.h"


widg::widg(QWidget *parent)
: QWidget(parent)
{

	label = new QLabel(tr("Find What"));
	line = new QLineEdit;
	label->setBuddy(line);

	close = new QPushButton(tr("Close"));
	close->resize(50,30);

	find = new QPushButton(tr("Find"));
	find->resize(50,30);
	find->setEnabled(false);
	find->setDefault(true);

	casechk = new QCheckBox(tr("Case Sensitive"));
	back = new QCheckBox(tr("Backward Search"));
	
	connect(close,SIGNAL(clicked()),this,SLOT(quit()));
	connect(line,SIGNAL(textChanged(const QString &)),this,SLOT(enableFind(const QString &)));
	connect(find,SIGNAL(clicked()),this,SLOT(findClicked()));

	QVBoxLayout *lay= new QVBoxLayout;
	lay->addWidget(label);
	lay->addWidget(line);
	lay->addWidget(casechk);
	lay->addWidget(back);
	lay->addWidget(find);
	lay->addWidget(close);
	setLayout(lay);

}

void widg::findClicked() 
{
	QString text = line->text();

	Qt::CaseSensitivity ct = casechk->isChecked() ? Qt::CaseSensitive : Qt::CaseInsensitive;

	if(back->isChecked())
	{
		emit findprev(text, ct);
	}
	else
	{
		emit findnext(text, ct);
	}
}

void widg::enableFind(const QString &text)
{
	find->setEnabled(true);
}

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the header file

#ifndef HEADER_H
#define HEADER_H
 
#include<QWidget>
 
class QLabel;
class QPushButton;
class QLineEdit;
class QCheckBox;
 
class widg:public QWidget
{
 
public:
 
	widg(QWidget *parent = 0);
 
private slots:
 
	void findClicked();
	void enableFind(const QString &text);
 
signals:
 
	void findnext(const QString &str, Qt::CaseSensitivity cs);
	void findprev(const QString &str, Qt::CaseSensitivity cs);
 
private:
 
	QLabel *label;
	QLineEdit *line;
	QPushButton *find;
	QPushButton *close;
	QCheckBox *casechk;
	QCheckBox *back;
};
 
#endif

#ifndef HEADER_H
#define HEADER_H

#include<QWidget>

class QLabel;
class QPushButton;
class QLineEdit;
class QCheckBox;

class widg:public QWidget
{

public:
	
	widg(QWidget *parent = 0);

private slots:

	void findClicked();
	void enableFind(const QString &text);

signals:

	void findnext(const QString &str, Qt::CaseSensitivity cs);
	void findprev(const QString &str, Qt::CaseSensitivity cs);

private:

	QLabel *label;
	QLineEdit *line;
	QPushButton *find;
	QPushButton *close;
	QCheckBox *casechk;
	QCheckBox *back;
};

#endif

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and the main

#include<QApplication>
 
 
#include"header.h"
 
 
int main(int argc,char *argv[])
{
	QApplication app(argc,argv);
 
	widg widget;
	widget.show();
 
	return app.exec();
}

#include<QApplication>


#include"header.h"


int main(int argc,char *argv[])
{
	QApplication app(argc,argv);
	
	widg widget;
	widget.show();

	return app.exec();
}

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and i get the following error message

Linking...
header.obj : error LNK2001: unresolved external symbol "protected: void __thiscall widg::findnext(class QString const &,enum Qt::CaseSensitivity)" (?findnext@widg@@IAEXABVQString@@W4CaseSensitivity @Qt@@@Z)
header.obj : error LNK2001: unresolved external symbol "protected: void __thiscall widg::findprev(class QString const &,enum Qt::CaseSensitivity)" (?findprev@widg@@IAEXABVQString@@W4CaseSensitivity @Qt@@@Z)
release/r4.exe : fatal error LNK1120: 2 unresolved externals
Error executing link.exe.

r4.exe - 3 error(s), 0 warning(s)

i don't know what to do..!! please help...!!

[JimDaniel]

Just add Q_OBJECT macro to your header file and it will compile.

#ifndef HEADER_H
#define HEADER_H
 
#include<QWidget>
 
class QLabel;
class QPushButton;
class QLineEdit;
class QCheckBox;
 
class widg:public QWidget
{
      Q_OBJECT
 
public:
 
widg(QWidget *parent = 0);
 
private slots:
 
void findClicked();
void enableFind(const QString &text);
 
signals:
 
void findnext(const QString &str, Qt::CaseSensitivity cs);
void findprev(const QString &str, Qt::CaseSensitivity cs);
 
private:
 
QLabel *label;
QLineEdit *line;
QPushButton *find;
QPushButton *close;
QCheckBox *casechk;
QCheckBox *back;
};
 
#endif

#ifndef HEADER_H
#define HEADER_H

#include<QWidget>

class QLabel;
class QPushButton;
class QLineEdit;
class QCheckBox;

class widg:public QWidget
{
      Q_OBJECT

public:

widg(QWidget *parent = 0);

private slots:

void findClicked();
void enableFind(const QString &text);

signals:

void findnext(const QString &str, Qt::CaseSensitivity cs);
void findprev(const QString &str, Qt::CaseSensitivity cs);

private:

QLabel *label;
QLineEdit *line;
QPushButton *find;
QPushButton *close;
QCheckBox *casechk;
QCheckBox *back;
};

#endif

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[manu]

ok...I tried putting Q_OBJECT in my header file...now i am getting 6 errors...

--------------------Configuration: r1 - Win32 Release--------------------
Running MOC on ..\..\..\test5\header.h
Compiling...
moc_header.cpp
Linking...
main.obj : error LNK2001: unresolved external symbol "public: void __thiscall widg::setval2(int)" (?setval2@widg@@QAEXH@Z)
main.obj : error LNK2001: unresolved external symbol "public: void __thiscall widg::setval1(int)" (?setval1@widg@@QAEXH@Z)
main.obj : error LNK2001: unresolved external symbol "public: __thiscall cannonfld::cannonfld(class QWidget *)" (??0cannonfld@@QAE@PAVQWidget@@@Z)
main.obj : error LNK2001: unresolved external symbol "public: void __thiscall widg::setrng2(int,int)" (?setrng2@widg@@QAEXHH@Z)
main.obj : error LNK2001: unresolved external symbol "public: void __thiscall widg::setrng1(int,int)" (?setrng1@widg@@QAEXHH@Z)
release/r1.exe : fatal error LNK1120: 5 unresolved externals
Error executing link.exe.

r1.exe - 6 error(s), 0 warning(s)

what i want to knw is why is it displaying errors in the functions which don't exist anywhere in my code...??

main.obj : error LNK2001: unresolved external symbol "public: void __thiscall widg::setval2(int)" (?setval2@widg@@QAEXH@Z)
main.obj : error LNK2001: unresolved external symbol "public: void __thiscall widg::setval1(int)" (?setval1@widg@@QAEXH@Z)
main.obj : error LNK2001: unresolved external symbol "public: __thiscall cannonfld::cannonfld(class QWidget *)" (??0cannonfld@@QAE@PAVQWidget@@@Z)
main.obj : error LNK2001: unresolved external symbol "public: void __thiscall widg::setrng2(int,int)" (?setrng2@widg@@QAEXHH@Z)
main.obj : error LNK2001: unresolved external symbol "public: void __thiscall widg::setrng1(int,int)" (?setrng1@widg@@QAEXHH@Z)
release/r1.exe : fatal error LNK1120: 5 unresolved externals
Error executing link.exe.

r1.exe - 6 error(s), 0 warning(s)

[JimDaniel]

I'm not sure. Are these functions you had in there but took out? If so, assuming you're using Visual Studio, go to Build->Clean Solution, then Build->Rebuild Solution. See if that helps.

[manu]

ahhh...!!! got it.... thanks mate.... it worked...