C2871 Error : namespace doesnot exist

[snow_starzz]

Hi guys,

I have some problem with external lib.. i try to include external lib into my project but it producing this C2871 error.

C:\Qt\OpenCVProject\20150505_23_Vid\mainwindow.h:9 : error: C2871: 'Videoman' : a namespace with this name does not exist

I already include the related .h file but its still showing the error.. What should i do? Where did i do wrong?

this is my .pro file

QT       += core gui opengl xml
 
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
TARGET = uEyeCam
TEMPLATE = app
 
 
SOURCES += main.cpp\
        mainwindow.cpp
 
HEADERS  += mainwindow.h
 
FORMS    += mainwindow.ui
 
win32:CONFIG(release, debug|release): LIBS += -LC:/OpenCV/VideoMan1.1/build/lib/ -lVideoMan
else:win32:CONFIG(debug, debug|release): LIBS += -LC:/OpenCV/VideoMan1.1/build/lib/ -lVideoMand
 
INCLUDEPATH += C:/OpenCV/VideoMan1.1/include
DEPENDPATH += C:/OpenCV/VideoMan1.1/include

QT       += core gui opengl xml

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = uEyeCam
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

win32:CONFIG(release, debug|release): LIBS += -LC:/OpenCV/VideoMan1.1/build/lib/ -lVideoMan
else:win32:CONFIG(debug, debug|release): LIBS += -LC:/OpenCV/VideoMan1.1/build/lib/ -lVideoMand

INCLUDEPATH += C:/OpenCV/VideoMan1.1/include
DEPENDPATH += C:/OpenCV/VideoMan1.1/include

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my .h file

#include <QMainWindow>
#include "VideoManControl.h"
#include "VideoManInputFormat.h"
 
using namespace std;
using namespace Videoman;
 
namespace Ui {
class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private slots:
    void on_displayButton_clicked();
    void openCamera();
 
private:
    Ui::MainWindow *ui;
};

#include <QMainWindow>
#include "VideoManControl.h"
#include "VideoManInputFormat.h"

using namespace std;
using namespace Videoman;

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_displayButton_clicked();
    void openCamera();

private:
    Ui::MainWindow *ui;
};

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and VideoManControl.h file

#ifndef VIDEOMANCONTROL_H
#define VIDEOMANCONTROL_H
 
#ifdef WIN32
#ifdef VideoMan_EXPORTS
#define VIDEOMAN_API __declspec(dllexport)
#else
#define VIDEOMAN_API __declspec(dllimport)
#endif
#endif
#ifdef linux
#define VIDEOMAN_API 
#endif
 
#include "VideoManInputFormat.h"
 
namespace VideoManPrivate
{
	class VideoManControlPrivate;
	class VideoManInputController;
};
 
namespace VideoMan
{
///////---------related code-------------///////
};
#endif

#ifndef VIDEOMANCONTROL_H
#define VIDEOMANCONTROL_H

#ifdef WIN32
#ifdef VideoMan_EXPORTS
#define VIDEOMAN_API __declspec(dllexport)
#else
#define VIDEOMAN_API __declspec(dllimport)
#endif
#endif
#ifdef linux
#define VIDEOMAN_API 
#endif

#include "VideoManInputFormat.h"

namespace VideoManPrivate
{
	class VideoManControlPrivate;
	class VideoManInputController;
};

namespace VideoMan
{
///////---------related code-------------///////
};
#endif

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thanks in advance..

[anda_skoa]

Typo in namespace name.
VideoMan vs Videoman

Cheers,
_

[snow_starzz]

Typo in namespace name.
VideoMan vs Videoman

Cheers,
_

OMG!!! thank you so much...

spending days trying to include the library..
after get rid of include error, error cant used the namespace appeared...
mybe i over think this... this is embarrassing..

[d_stranz]

mybe i over think this... this is embarrassing..

There isn't a single one of us here that hasn't been there and done this.

[stampede]

spending days trying to include the library..

Try using a nice code editor with code completion feature - this way you can just type "using namespace Vid" and press ctrl+space