The following programm is a minimal windows program. It opens a window and writes a text into the window.

If you compile it with MinGW, be sure to add the -mwindowsflag in order to prevent the ... undefined reference to 'TextOutA@20' and ... undefined reference to 'GetStockObject@4 linker error.

#include <windows.h>

LRESULT CALLBACK WndProc(

    HWND   hWnd,

    UINT   msg,

    WPARAM wParam,

    LPARAM lParam ) {

  switch( msg ) {

    case WM_PAINT: {

      PAINTSTRUCT ps;

      HDC hDC = BeginPaint( hWnd, &ps );

      TextOut(hDC, 10, 10, "ADP GmbH", 8 );

      EndPaint( hWnd, &ps );

    }

    break;

    case WM_DESTROY:

      PostQuitMessage(0);

    break;

    default:

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

  } 

  return 0;

}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, 

                   LPSTR lpCmdLine, int nCmdShow) {

  WNDCLASSEX wce;

  wce.cbSize        = sizeof(wce);

  wce.style         = CS_VREDRAW | CS_HREDRAW; 

  wce.lpfnWndProc   = (WNDPROC) WndProc; 

  wce.cbClsExtra    = 0; 

  wce.cbWndExtra    = 0; 

  wce.hInstance     = hInstance; 

  wce.hIcon         = LoadIcon((HINSTANCE) NULL, IDI_APPLICATION); 

  wce.hCursor       = LoadCursor((HINSTANCE) NULL, IDC_ARROW); 

  wce.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH); 

  wce.lpszMenuName  = 0;

  wce.lpszClassName = "ADPWinClass",

  wce.hIconSm       = 0;

  if (!RegisterClassEx(&wce)) return 0; 

  HWND hWnd = CreateWindowEx(

    0,          // Ex Styles

    "ADPWinClass",

    "ADP GmbH",

     WS_OVERLAPPEDWINDOW,

     CW_USEDEFAULT,  // x

     CW_USEDEFAULT,  // y

     CW_USEDEFAULT,  // Height

     CW_USEDEFAULT,  // Width

     NULL,           // Parent Window

     NULL,           // Menu, or windows id if child

     hInstance,      // 

     NULL            // Pointer to window specific data

  );

  ShowWindow( hWnd, nCmdShow );

  MSG msg;

  int r;

  while ((r = GetMessage(&msg, NULL, 0, 0 )) != 0) { 

    if (r == -1) {

      ;  // Error!

    }

    else {

      TranslateMessage(&msg); 

      DispatchMessage(&msg); 

    }

  } 

  // The application's return value

  return msg.wParam;

};