도도의 초록누리

#include <Windows.h>
#include <tchar.h>

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

LPTSTR lpszClass = _T("BasicApi");

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdParam, int nCmdShow)
{
       HWND hWnd;
       MSG Message;
       WNDCLASS WndClass;

       WndClass.cbClsExtra = 0;
       WndClass.cbWndExtra = 0;
       WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
       WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
       WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
       WndClass.hInstance = hInstance;
       WndClass.lpfnWndProc = (WNDPROC)WndProc;
       WndClass.lpszClassName = lpszClass;
       WndClass.lpszMenuName = NULL;
       WndClass.style = CS_HREDRAW | CS_VREDRAW;

       RegisterClass(&WndClass);

       hWnd = CreateWindow(lpszClass, LPTSTR(_T("제목")), 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);
       }

       return Message.wParam;

}

LRESULT CALLBACK WndProc(HWND hWnd, UINT iMessage, WPARAM wParam, LPARAM lParam)
{
      HDC hdc;
      PAINTSTRUCT ps;
 
      switch (iMessage)
     {
           case WM_CREATE:
                return 0;

           case WM_PAINT:
               hdc = BeginPaint(hWnd, &ps);
               EndPaint(hWnd, &ps);
               return 0;

           case WM_DESTROY:
               PostQuitMessage(0);
               return 0;

     }

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

} 

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

      int nReturn;
 
      switch (iMessage)
     {
           case WM_CREATE:
                return 0;

           case WM_PAINT:
               hdc = BeginPaint(hWnd, &ps);
               EndPaint(hWnd, &ps);
               return 0;

          case WM_CLOSE:

               nReturn = MessageBox(hWnd, _T("정말 종료하시겠습니까?"), _T("확인"), MB_YESNO);

               if(nReturn == IDYES)

                     DestroyWindow(hWnd);

               return 0;

           case WM_DESTROY:
               PostQuitMessage(0);
               return 0;

     }

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

}