#include <windows.h>
#include <cstdio>

#define WINDOW_NAME "Test"
#define CLASS_NAME	"MyWindowClass"

HBITMAP		hBMP = NULL;

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

HBITMAP LoadBitmap (char* szName);

int WINAPI WinMain (HINSTANCE hI, HINSTANCE hPI,
					LPSTR lpCmdLine, int iCmdShow)
{

	WNDCLASSEX wc;

	wc.cbClsExtra		= NULL;
	wc.cbSize			= sizeof( WNDCLASSEX );
	wc.cbWndExtra		= NULL;
	wc.hbrBackground	= (HBRUSH)GetStockObject( WHITE_BRUSH );
	wc.hCursor			= LoadCursor( 0, IDC_ARROW );
	wc.hIcon			= LoadIcon( 0, IDI_WINLOGO );
	wc.hIconSm			= NULL;
	wc.hInstance		= hI;
	wc.lpfnWndProc		= WndProc;
	wc.lpszClassName	= CLASS_NAME;
	wc.lpszMenuName		= NULL;
	wc.style			= CS_VREDRAW|CS_HREDRAW;

	RegisterClassEx( &wc );

	HWND hWnd = CreateWindowEx( NULL, CLASS_NAME, WINDOW_NAME, WS_OVERLAPPEDWINDOW,
								CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
								NULL, NULL, hI, NULL );

	ShowWindow( hWnd, iCmdShow );
	UpdateWindow( hWnd );

	MSG msg;

	hBMP = LoadBitmap( "Bitmap.bmp" );
	InvalidateRect( hWnd, NULL, true );

	while (GetMessage( &msg, NULL, 0, 0 ))
	{

		TranslateMessage( &msg );
		DispatchMessage( &msg );

	} // while

	UnregisterClass( CLASS_NAME, hI );

	DeleteObject( hBMP );

	return msg.wParam;

} // WinMain

HRESULT CALLBACK WndProc (HWND hWnd, UINT message,
						  WPARAM wParam, LPARAM lParam)
{

	PAINTSTRUCT ps;
	HDC			hDC = NULL;
	HDC			hBmpDC = NULL;

	switch (message)
	{
	case WM_DESTROY:
		{
			PostQuitMessage( 0 );

			return 0;
		} // case WM_DESTROY

	case WM_PAINT:
		{

			hDC = BeginPaint( hWnd, &ps );

			hBmpDC = CreateCompatibleDC( hDC );
			SelectObject( hBmpDC, hBMP );
			BitBlt( hDC, 0, 0, 200, 200, hBmpDC, 0, 0, SRCCOPY );
			DeleteDC( hBmpDC );

			EndPaint( hWnd, &ps );

			return 0;

		} // case WM_PAINT

	} // switch

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

} // WndProc

HBITMAP LoadBitmap (char* szName)
{

	/* Variablen zum Laden der Informationen */
	FILE*				pFile			= NULL;
	BITMAPFILEHEADER	bmfh;
	BITMAPINFOHEADER	bmih;
	RGBQUAD*			colors			= NULL;
	int					size			= 0;
	BYTE*				tempPixelData	= NULL;
	HBITMAP				hBmp			= NULL;

	/* Öffnen der Datei */
	pFile = fopen( szName, "rb" );

	/* Laden des Dateikopfs */
	fread( &bmfh, sizeof( BITMAPFILEHEADER ), 1, pFile );

	/* Laden der Kopfinformationen */
	fread( &bmih, sizeof( BITMAPINFOHEADER ), 1, pFile );

	/* Laden der Farbpalette */
	if (bmih.biBitCount < 24)
	{

		size = 1 << bmih.biBitCount;
		colors = new RGBQUAD[size];

		if (colors == NULL)
		{
			fclose( pFile );
			return 0;
		} // if

		fread( colors, sizeof( RGBQUAD ), size, pFile );

	} // if

	/* Laden der Pixeldaten */
	size = bmfh.bfSize - bmfh.bfOffBits;
	tempPixelData = new BYTE[size];
	fread( tempPixelData, sizeof( BYTE ), size, pFile );

	/* Schließen des Handles */
	fclose( pFile );

	/* Bitmap erstellen */
	hBmp = CreateBitmap( bmih.biWidth, bmih.biHeight,
						 bmih.biPlanes, bmih.biBitCount, tempPixelData );

	/* Speicherfreigabe */
	delete [] colors;
	delete [] tempPixelData;

	return hBmp;

} // LoadBitmap

Ich habe dieses Programm schon einmal mit der LoadImage Funktion getestet und es hat funktioniert. Wer weiß was hier falsch ist schreibe das bitte.