I have created a new Windows Forms application.
After that, I have added a new form. In my form I have added the Form_Load event (by using the form editor).
As far I remember - Visual Studio produced the MainForm.c and MainForm.h files. I had to edit MainForm.c, add main function to it, etc.
I also created a class called CVEngine.
What I want to do
I want to create an instance of the CVEngine class inside my MainForm (see my MainForm.h file, MainForm_Load function at the end of file).
What is my problem?
I guess something is wrong with my includes. I don't know much about C++, and this is my first Windows Forms C++ application. I have a little background in C#, PHP, and a bit of Java. I have basic knowledge about C++ and header files, but this MainForm.h generated by Visual Studio is weird (there is code in .h file), and I'm a bit lost.
1>------ Build started: Project: Sensor Cam, Configuration: Debug Win32 ------
1> CVEngine.cpp
1> MainForm.cpp
1> Generating Code...
1>CVEngine.obj : error LNK2005: "public: __thiscall CVEngine::CVEngine(void)" (??0CVEngine@@QAE@XZ) already defined in MainForm.obj
1>CVEngine.obj : error LNK2005: "public: __thiscall CVEngine::~CVEngine(void)" (??1CVEngine@@QAE@XZ) already defined in MainForm.obj
1>CVEngine.obj : error LNK2005: "public: __thiscall CVEngine::CVEngine(void)" (??0CVEngine@@$$FQAE@XZ) already defined in MainForm.obj
1>CVEngine.obj : error LNK2005: "public: __thiscall CVEngine::~CVEngine(void)" (??1CVEngine@@$$FQAE@XZ) already defined in MainForm.obj
1>CVEngine.obj : warning LNK4248: unresolved typeref token (0100001A) for 'CvCapture'; image may not run
1>MainForm.obj : warning LNK4248: unresolved typeref token (01000021) for 'CvCapture'; image may not run
1>CVEngine.obj : error LNK2028: unresolved token (0A00052F) "extern "C" struct CvCapture * __cdecl cvCreateCameraCapture(int)" (?cvCreateCameraCapture@@$$J0YAPAUCvCapture@@H@Z) referenced in function "public: __thiscall CVEngine::CVEngine(void)" (??0CVEngine@@$$FQAE@XZ)
1>MainForm.obj : error LNK2028: unresolved token (0A000532) "extern "C" struct CvCapture * __cdecl cvCreateCameraCapture(int)" (?cvCreateCameraCapture@@$$J0YAPAUCvCapture@@H@Z) referenced in function "public: __thiscall CVEngine::CVEngine(void)" (??0CVEngine@@$$FQAE@XZ)
1>CVEngine.obj : error LNK2028: unresolved token (0A00065F) "int __cdecl cv::_interlockedExchangeAdd(int *,int)" (?_interlockedExchangeAdd@cv@@$$FYAHPAHH@Z) referenced in function "public: void __thiscall cv::SparseMat::addref(void)" (?addref@SparseMat@cv@@$$FQAEXXZ)
1>MainForm.obj : error LNK2028: unresolved token (0A000672) "int __cdecl cv::_interlockedExchangeAdd(int *,int)" (?_interlockedExchangeAdd@cv@@$$FYAHPAHH@Z) referenced in function "public: void __thiscall cv::SparseMat::addref(void)" (?addref@SparseMat@cv@@$$FQAEXXZ)
1>CVEngine.obj : error LNK2020: unresolved token (0A00066D) "public: void __thiscall cv::Mat::copySize(class cv::Mat const &)" (?copySize@Mat@cv@@$$FQAEXABV12@@Z)
1>MainForm.obj : error LNK2028: unresolved token (0A000680) "public: void __thiscall cv::Mat::copySize(class cv::Mat const &)" (?copySize@Mat@cv@@$$FQAEXABV12@@Z) referenced in function "public: __thiscall cv::Mat::Mat(class cv::Mat const &)" (??0Mat@cv@@$$FQAE@ABV01@@Z)
1>MainForm.obj : error LNK2019: unresolved external symbol "int __cdecl cv::_interlockedExchangeAdd(int *,int)" (?_interlockedExchangeAdd@cv@@$$FYAHPAHH@Z) referenced in function "public: void __thiscall cv::SparseMat::addref(void)" (?addref@SparseMat@cv@@$$FQAEXXZ)
1>CVEngine.obj : error LNK2001: unresolved external symbol "int __cdecl cv::_interlockedExchangeAdd(int *,int)" (?_interlockedExchangeAdd@cv@@$$FYAHPAHH@Z)
1>MainForm.obj : error LNK2019: unresolved external symbol "extern "C" struct CvCapture * __cdecl cvCreateCameraCapture(int)" (?cvCreateCameraCapture@@$$J0YAPAUCvCapture@@H@Z) referenced in function "public: __thiscall CVEngine::CVEngine(void)" (??0CVEngine@@$$FQAE@XZ)
1>CVEngine.obj : error LNK2001: unresolved external symbol "extern "C" struct CvCapture * __cdecl cvCreateCameraCapture(int)" (?cvCreateCameraCapture@@$$J0YAPAUCvCapture@@H@Z)
1>MainForm.obj : error LNK2019: unresolved external symbol "public: void __thiscall cv::Mat::copySize(class cv::Mat const &)" (?copySize@Mat@cv@@$$FQAEXABV12@@Z) referenced in function "public: __thiscall cv::Mat::Mat(class cv::Mat const &)" (??0Mat@cv@@$$FQAE@ABV01@@Z)
1>CVEngine.obj : error LNK2001: unresolved external symbol "public: void __thiscall cv::Mat::copySize(class cv::Mat const &)" (?copySize@Mat@cv@@$$FQAEXABV12@@Z)
1>e:\documents\visual studio 2013\Projects\Sensor Cam\Debug\Sensor Cam.exe : fatal error LNK1120: 9 unresolved externals
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
MainForm.h file:
#pragma once
#include "CVEngine.cpp"
namespace SensorCam {
using namespace System;
using namespace System::ComponentModel;
using namespace System::Collections;
using namespace System::Windows::Forms;
// using namespace System::Data;
using namespace System::Drawing;
/// <summary>
/// Summary for MainForm
/// </summary>
public ref class MainForm : public System::Windows::Forms::Form
{
public:
MainForm(void)
{
InitializeComponent();
//
// TODO: Add the constructor code here
//
}
protected:
/// <summary>
/// Clean up any resources being used.
/// </summary>
~MainForm()
{
if (components)
{
delete components;
}
}
private:
System::ComponentModel::Container ^components;
#pragma region Windows Form Designer generated code
void InitializeComponent(void)
{
this->SuspendLayout();
//
// MainForm
//
this->AutoScaleDimensions = System::Drawing::SizeF(6, 13);
this->AutoScaleMode = System::Windows::Forms::AutoScaleMode::Font;
this->ClientSize = System::Drawing::Size(633, 418);
this->Name = L"MainForm";
this->Text = L"Sensor Cam";
this->Load += gcnew System::EventHandler(this, &MainForm::MainForm_Load);
this->ResumeLayout(false);
}
#pragma endregion
private: System::Void MainForm_Load(System::Object^ sender, System::EventArgs^ e)
{
CVEngine cve = CVEngine::CVEngine();
}
};
}
MainForm.cpp file:
#include "MainForm.h"
using namespace System;
using namespace System::Windows::Forms;
[STAThread]
void main(int argc, char *argv[])
{
Application::EnableVisualStyles();
// Application::SetCompatibleTextRenderingDefault(false);
SensorCam::MainForm form;
Application::Run(%form);
}
CvEngine.cpp file:
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;
class CVEngine
{
public:
CVEngine();
~CVEngine();
private:
CvCapture* capture;
};
CVEngine::CVEngine()
{
capture = cvCaptureFromCAM(-1);
if (!capture)
{
// Todo: error handling
}
}
CVEngine::~CVEngine()
{
}
To get it compiling, create a cv_engine.h file
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;
class CVEngine
{
public:
CVEngine();
~CVEngine();
private:
CvCapture* capture;
};
cv_engine.cpp
#include "cv_engine.h"
CVEngine::CVEngine()
{
capture = cvCaptureFromCAM(-1);
if (!capture)
{
// todo: error handling
}
}
CVEngine::~CVEngine()
{
}
Then #include "cv_engine.h" in Mainform.h
Also, you shouldn't really do things like this in header files...
using namespace cv;
When you can just use scope...
cv::CvCapture* capture;