從命令提示符編譯BADA簡單helloworld程序，並得到錯誤

Question

我試圖編譯一個簡單的Helloworld程序BADA，但通過命令prompt.After編譯我可以得到的錯誤爲 c：/Helloworld/src/Helloworld.cpp： 12：error：'Osp :: App :: Application HelloWorld :: CreateInstance（）'的原型不匹配類'HelloWorld'中的任何一個 C：/Helloworld/inc/HelloWorld.h:21：error：candidate is：static Osp :: App :: Application * HelloWorld :: CreateInstance（） 任何機構都可以幫助完成需要完成的任務。 感謝

代碼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 

代碼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 
} 

代碼Helloworldentry.cpp

/** 
* OSP Application entry point(OspMain) introduced. 
*/ 
#include <fapp.h> 
#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

編譯器抱怨說，您已經定義具有此簽名的方法：

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

而HelloWorld類聲明其CreateInstance方法有此簽名：

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

注意，在返回類型的差異。類定義說明使用此名稱的方法將返回一個Application指針，但是您已實現了一種方法，該方法返回Application對象。

將來，請將代碼與編譯器錯誤一起發佈。很少有可能充分解釋編譯器錯誤與產生它們的代碼隔離。例如，在這種情況下，我不能告訴你哪種返回類型是正確的;我只能告訴你返回類型不匹配（這正是編譯器已經說過的）。