Compiling BADA simple helloworld program from command prompt and getting errors

Question

Hello I was trying to compile a simple Helloworld program for BADA but through command prompt.After compiling i ma getting the errors as c:/Helloworld/src/Helloworld.cpp:12: error: prototype for 'Osp::App::Application HelloWorld::CreateInstance()' does not match any in class 'HelloWorld' C:/Helloworld/inc/HelloWorld.h:21: error: candidate is: static Osp::App::Application* HelloWorld::CreateInstance() could any body help that what needs to be done with it. Thanks

Code for Helloworld.h

#ifndef HELLOWORLD_H #define HELLOWORLD_H

#include <FBase.h>
#include <FGraphics.h>
#include <FLocales.h>
#include <FSystem.h>
#include <FApp.h>

using namespace Osp::Base;
using namespace Osp::Graphics;
using namespace Osp::Locales;
using namespace Osp::System;
using namespace Osp::App;

class HelloWorld :
    public Application // must inherit from Application class
{
public:
    // The application must have a factory method that creates an instance of the application.
    static Application* CreateInstance(void);

public:
    HelloWorld();
    ~HelloWorld();

public:
       // The application must provide its name.
    String GetAppName(void) const;

protected:
    // The application must provide its ID.
    AppId GetAppId(void) const;

    AppSecret GetAppSecret(void) const;

public:
    // This method is called when the application is initializing.
    bool OnAppInitializing(AppRegistry& appRegistry);

    // This method is called when the application is terminating.
    bool OnAppTerminating(AppRegistry& appRegistry);

    // Thie method is called when the application is brought to the foreground
    void OnForeground(void);

    // This method is called when the application is sent to the background.
    void OnBackground(void);

    // This method is called when the application has little available memory.
    void OnLowMemory(void);

    // This method is called when the device's battery level changes.
    void OnBatteryLevelChanged(BatteryLevel batteryLevel);
};

#endif

Code for Helloworld.cpp

include "HelloWorld.h"

HelloWorld::HelloWorld()
{
}

HelloWorld::~HelloWorld()
{
}

Application*
HelloWorld::CreateInstance(void)
{
    // You can create the instance through another constructor.
    return new HelloWorld();
}

String
HelloWorld::GetAppName(void) const
{
    static String appName(L"HelloWorld");
    return appName;
}

AppId
HelloWorld::GetAppId(void) const
{
    static AppId appId(L"93bt1p123e");
    return appId;
}

AppSecret
HelloWorld::GetAppSecret(void) const
{
    static AppSecret appSecret(L"9C645DDBA19C71BAD1204DA4DAA7A0B9");
    return appSecret;
}

bool
HelloWorld::OnAppInitializing(AppRegistry& appRegistry)
{
    // TODO:
    // Initialization including UI construction can be done here.
    // Load the application's latest data, if necessary.
    // If this method is successful, return true; otherwise, return false.
    return true;
}

bool
HelloWorld::OnAppTerminating(AppRegistry& appRegistry)
{
    // TODO:
    // Deallocate or close any resources still alive.
    // Save the application's current states, if applicable.
    // If this method is successful, return true; otherwise, return false.
    return true;
}

void
HelloWorld::OnForeground(void)
{
    result r = E_SUCCESS;

    Canvas* pCanvas = GetAppFrame()->GetCanvasN();
    if(pCanvas == null)
        return;

    Font* pFont = new Font();
 pFont->Construct(FONT_STYLE_PLAIN | FONT_STYLE_BOLD, 50);
    pCanvas->SetFont(*pFont);

    r = pCanvas->DrawText(Point(30, 30), GetAppName());
    if (IsFailed(r))
    {
        AppLog("pCanvas->DrawText() failed.\n");
        delete pCanvas;
        return;
    }

    r = pCanvas->Show();
    if (IsFailed(r))
    {           AppLog("pCanvas->Show() failed.\n");
        delete pCanvas;
        return;
    }

    delete pCanvas;

}

void
HelloWorld::OnBackground(void)
{
}

void
HelloWorld::OnLowMemory(void)
{
    // TODO:
    // Deallocate as many resources as possible.
}

void
HelloWorld::OnBatteryLevelChanged(BatteryLevel batteryLevel)
{
    // TODO:
    // It is recommended that the application save its data,
    // and terminate itself if the application consumes much battery
}

Code for Helloworldentry.cpp

/** * OSP Application entry point(OspMain) introduced. */ #include #include "HelloWorld.h"

using namespace Osp::Base::Collection;

extern "C"
{
    __declspec(dllexport) void OspMain(int hInstance, int argc, char *argv[]);
}

/**
* Entry function of OSP Application which is called by the operating system.
*/
extern "C" {
void OspMain(int hInstance, int argc, char *argv[])
{
    AppLog("OspMain() Started. \n");

    result r = E_SUCCESS;

    ArrayList* pArgs = new ArrayList();
    pArgs->Construct();
    for (int i = 0; i < argc; i++)
    {
        String* pEachArg = new String(argv[i]);
        pArgs->Add(*pEachArg);
    }

    r = Osp::App::Application::Execute(HelloWorld::CreateInstance, pArgs);
    if (IsFailed(r))
    {
        AppLog("Application execution has failed.\n");
    }

    if (pArgs)
    {
        pArgs->RemoveAll(true);
        delete pArgs;
    }

    AppLog("OspMain() Ended. \n");
}
}

Answer 1

The compiler is complaining that you have defined a method with this signature:

Osp::App::Application HelloWorld::CreateInstance()

whereas the HelloWorld class declares that its CreateInstance method has this signature:

Osp::App::Application* HelloWorld::CreateInstance()

Note the difference in the return type. The class definition says that the method with this name returns an Application pointer but you have implemented a method that returns an Application object.

In the future, please post code along with compiler errors. It's rarely possible to adequately explain compiler errors in isolation from the code that produced them. For example, I can't tell you which return type is correct in this case; I can only tell you that the return types don't match (which is exactly what the compiler already said).