Hier der Quellcode (ohne std::cout<<"Hallo"; und #include <iostream>:

//----------------------------------------------------------
// RatDochMal.cpp:
//----------------------------------------------------------

#include "RatDochMal.h"

LRESULT CALLBACK WndProc (HWND hWnd, 
  UINT iMessage, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain
  (HINSTANCE hInstance, HINSTANCE hPrevInstance, 
   LPSTR lpCmdLine, int nShowCmd)
{
//----------------------------------------------------------
//Fensterklasse
//----------------------------------------------------------
  WNDCLASS Win;     
  MSG      msg; 
//----------------------------------------------------------
//Einstellungen
//----------------------------------------------------------
  Win.cbClsExtra = 0;
  Win.cbWndExtra = 0;
  Win.hInstance  = hInstance;    
  Win.hIcon = LoadIcon(hInstance, IDI_APPLICATION);
  Win.hCursor = LoadCursor(NULL, IDC_ARROW);
  Win.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
  Win.style = CS_HREDRAW | CS_VREDRAW;
  Win.lpfnWndProc = WndProc;
  Win.lpszClassName = "???";
  Win.lpszMenuName = NULL;
  RegisterClass (&Win);
//----------------------------------------------------------
//Fenster erstellen
//----------------------------------------------------------
  GHandle = CreateWindow (Win.lpszClassName, 
						  "RatDochMal - [Esc]=Ende", 
						  WS_TILED, 
                          CW_USEDEFAULT, 
						  CW_USEDEFAULT, 
						  MaxWidth, 
                          MaxHeight, 
						  NULL, 
						  NULL, 
						  hInstance, 
						  NULL);
  if (!GHandle)
  {
    return 0;
  }
  ShowWindow   (GHandle, nShowCmd);
  UpdateWindow (GHandle);
//----------------------------------------------------------
//Programm
//---------------------------------------------------------- 
  isRunning = true;
  while (isRunning) 
  {
    while 
      (PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE))
    {
      if (!GetMessage(&msg, NULL, 0, 0 ))
      {
        isRunning = false;
        break;
      }
      TranslateMessage (&msg);
      DispatchMessage  (&msg);
    }
  }
  return 1;
}

//----------------------------------------------------------
//Fensterschliesen wenn Esc gedrückt
//----------------------------------------------------------
LRESULT CALLBACK WndProc (HWND hWnd, 
  UINT iMessage, WPARAM wParam, LPARAM lParam)
{
  switch (iMessage)
  {
    case WM_KEYDOWN:
    {
      switch (wParam)
      {
        case VK_ESCAPE:  
        {
          PostMessage(hWnd, WM_QUIT, 0, 0);
        }
      }
    }
    default:
      return DefWindowProc 
        (hWnd, iMessage, wParam, lParam);
  }
  return 0;
}

//-------------------------------------------------
//RatDochMal.h:
//-------------------------------------------------

#include <windows.h>

// Konstanten
const int MaxWidth     = 500;   // Max. Screenbreite
const int MaxHeight    = 300;   // Max. Screenhöhe

// Globalvariablen
HWND GHandle;                   // Fenster-Handle 
bool isRunning;                 // "Laufvariable"

Ich hoffe ihr könnt mir helfen

mfg Dimo

die Standard I/O Library funktioniert nur in Konsolenprogrammen, damit kommst Du in einer GUI nicht sehr weit ...

http://www.winprog.org/tutorial/fonts.html

Du brauchst ein "Edit"-Fenster/Steuerelement für die Eingabe von Text ...

http://msdn.microsoft.com/en-us/library/bb773169%28VS.85%29.aspx

Gruß
Greenhorn

http://www.win-api.de/tutorials.php?tutid=18

und ...

http://www.henkessoft3000.de/

Gruß
Greenhorn