GDI PLUS

#include <windows.h>
#include <gdiplus.h>
using namespace Gdiplus;
#pragma comment(lib, "gdiplus")

LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);
HINSTANCE g_hInst;
HWND hWndMain;
LPCTSTR lpszClass=TEXT("GdiPlusStart");

int APIENTRY WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance ,
                     LPSTR lpszCmdParam,int nCmdShow)
{
    HWND hWnd;
    MSG Message;
    WNDCLASS WndClass;
    g_hInst=hInstance;
    ULONG_PTR gpToken;
    GdiplusStartupInput gpsi;

    if (GdiplusStartup(&gpToken,&gpsi,NULL) != Ok) {
        MessageBox(NULL,"GDI+ 라이브러리를 초기화할 수 없습니다.","알림",MB_OK);
        return 0;
    }

    WndClass.cbClsExtra=0;
    WndClass.cbWndExtra=0;
    WndClass.hbrBackground=(HBRUSH)(COLOR_WINDOW+1);
    WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
    WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
    WndClass.hInstance=hInstance;
    WndClass.lpfnWndProc=WndProc;
    WndClass.lpszClassName=lpszClass;
    WndClass.lpszMenuName=NULL;
    WndClass.style=CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&WndClass);
    hWnd=CreateWindow(lpszClass,lpszClass,WS_OVERLAPPEDWINDOW,
                        CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
                        NULL,(HMENU)NULL,hInstance,NULL);
    ShowWindow(hWnd,nCmdShow);


    while(GetMessage(&Message,0,0,0)) {
        TranslateMessage(&Message);
        DispatchMessage(&Message);
    }
    GdiplusShutdown(gpToken);
    return (int)Message.wParam;
}

void OnPaint(HDC hdc)
{
    Graphics G(hdc);
    Pen P(Color(255,0,0,255),5);
    G.DrawEllipse(&P,10,10,300,200);
}


LRESULT CALLBACK WndProc(HWND hWnd,UINT iMessage,WPARAM wParam,LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;

    switch(iMessage) {
    case WM_CREATE:
        hWndMain=hWnd;
        return 0;
    case WM_PAINT:
        hdc=BeginPaint(hWnd, &ps);
        OnPaint(hdc);
        EndPaint(hWnd, &ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }

    return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}