Question

我想在Windows10中使用DirectX开发游戏。我曾经用CodeBlocks编写代码。以下代码将抛出以下错误：

undefined reference to `GetStockObject@4'

此Windows功能有什么问题？我不必单独初始化或编写此函数，不是吗？注释掉错误代码将编译代码，但是没有GUI ... 这是代码：

#include <windows.h>
#include"Frame.h"
//global definitions
BOOL done;
int Spiel_Zustand;
HWND hwnd;

//Function:CallBack
LRESULT CALLBACK WindowProc (HWND hwnd,UINT message, WPARAM wparam,LPARAM lparam)
{
    switch(message)
    {
    case WM_DESTROY :
    {
        done=TRUE;
        PostQuitMessage(0);
        return 0;
    }
    break;
    case WM_KEYDOWN:
        switch(wparam)
        {
        case VK_ESCAPE:
        {
            PostMessage(hwnd,WM_CLOSE,0,0);
            return 0;
        }
        break;
        }
        break;
    default:
        break;

    }//End of switch
    return DefWindowProc(hwnd,message,wparam,lparam);
}//End of CallBack

//Function:Start
int WINAPI WinMain(HINSTANCE hinst,HINSTANCE hprevinst,LPSTR lpcmdline,int ncmdshow)
{
    WNDCLASSEX winclass;
    MSG message;
    const char szclassname[]="Klassenname";
    DWORD loop_start_time;
    winclass.cbSize=sizeof(WNDCLASSEX);
    winclass.style=CS_HREDRAW|CS_VREDRAW;
    winclass.lpfnWndProc=WindowProc;
    winclass.cbClsExtra=0;
    winclass.cbWndExtra=0;
    winclass.hInstance=hinst;
    winclass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    winclass.hCursor=LoadCursor(NULL,IDC_ARROW);
    winclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);//this will throw out error
    winclass.lpszClassName=szclassname;
    winclass.hIconSm=LoadIcon(NULL,IDI_APPLICATION);
    if(!RegisterClassEx(&winclass))
        return 0;
    //Create handle of windows ans save it globally
    if(!(hwnd=CreateWindowEx(NULL,szclassname,"3D Gameprograming - Title",WS_POPUPWINDOW|WS_VISIBLE,0,0,400,300,NULL,NULL,hinst,NULL)))
        return 0;
    done=FALSE;
    Spiel_Zustand=SPIEL_AUSWAHL;
    //Phase 1.1:
    Spiel_Initialisieren();
    //Phase 1.2:: Main Looping
    while(!done)
    {
        //Any message to handle?
        while(GetMessage(&message,NULL,0,0))
        {
            TranslateMessage(&message);
            DispatchMessage(&message);
        }
        //Start time of Main Loop
        loop_start_time=GetTickCount;
        switch(Spiel_Zustand)
        {
        case SPIEL_AUSWAHL:
        {
            //[....]
            Spiel_Zustand=SPIEL_START;
        }
        break;
        case SPIEL_START:
        {
            //[...]
            Spiel_Zustand=SPIEL_LAEUFT;
        }
        break;
        case SPIEL_LAEUFT:
        {
            //waiting for User input
            //Manage User input
            //Artificial Intelligence and game logic
            //Rendering Frame
        } break;
        case SPIEL_NEUSTART:
        {
            //[...]
            Spiel_Zustand=SPIEL_START;
        }
        break;
        default:
            break;
        }//End of switch
        //Restricting Frame rate
        while((GetTickCount()-loop_start_time)<40);
    }//End of Main Looping
    //Phase 1.3
    Spiel_Beenden();
    return message.wParam;
}//End of Start


//Phase 2.1
int Spiel_Initialisieren(void)
{
//ToDO:initializations etc..
    return 1;
}
//Phase 2.2
int Spiel_Beenden(void)
{
    //ToDO:Free Memory etc..
    return 1;
}

Answer 1

编译_photoFile = new File(Environment.SoftSettings.AttachmentsPath, String.Format("{0}.jpg", Guid.NewGuid())); Intent intent = new Intent(MediaStore.ActionImageCapture); if (Build.VERSION.SdkInt >= BuildVersionCodes.N) { // Android 7 requirment to use content:// scheme var uriFile = Android.Support.V4.Content.FileProvider.GetUriForFile( context, context.ApplicationContext.PackageName + ".provider", _photoFile); intent.AddFlags(ActivityFlags.GrantReadUriPermission); intent.PutExtra(MediaStore.ExtraOutput, uriFile); } else { intent.PutExtra(MediaStore.ExtraOutput, Uri.FromFile(_photoFile)); } StartActivityForResult(intent, (int)ActivityRequestCode.Camera);时需要链接gdi32.lib

Undefined reference to GetStockObject@4

DirectX游戏的窗口GUI似乎有问题

1 个答案: