Thread: Bmp background in C++

I made a program and would like to know how to put a wallpaper behind.
with this code put an orange with a yellow line!

Code:

#include "stdafx.h"
#include "Painter.h"

BOOL APIENTRY DllMain(HMODULE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
	DisableThreadLibraryCalls(hModule);
	return true;
}

class BackgroundPainter : public Painter
{
private:
	HBRUSH brush;
	HPEN pen;
	HFONT font;

public:
	virtual void Paint(HDC hdc, int horizonOffsetY, int viewOffsetX, int viewOffsetY, int viewWidth, int viewHeight, int x, int y, int width, int height)
	{
		SelectObject(hdc, pen);
		SelectObject(hdc, font);
		SetTextColor(hdc, RGB(0, 0, 0));
		SetBkMode(hdc, TRANSPARENT);

		RECT rc = { x, y, x + width, y + height };
		FillRect(hdc, &rc, brush);

		//como não tem nenhum tratamento especial, apenas soma os dois
		viewOffsetY += horizonOffsetY;

		MoveToEx(hdc, viewOffsetX, viewHeight + viewOffsetY, 0);
		LineTo(hdc, viewOffsetX + 300, viewHeight + viewOffsetY - 300);
		LineTo(hdc, viewOffsetX + 600, viewHeight + viewOffsetY);
		LineTo(hdc, viewOffsetX + 900, viewHeight + viewOffsetY - 300);
		LineTo(hdc, viewOffsetX + 1200, viewHeight + viewOffsetY);

		SetTextAlign(hdc, TA_LEFT);
		TextOut(hdc, 0, 0, TEXT("Eu sou o topo!"), 14);
		TextOut(hdc, viewOffsetX, viewHeight + viewOffsetY - 20, TEXT("Eu sou o baseline!"), 18);

		SetTextAlign(hdc, TA_RIGHT);
		TextOut(hdc, viewWidth, viewHeight + viewOffsetY - 20, TEXT("Eu sou o baseline no canto!"), 27);
	}

	virtual BOOL Initialize()
	{
		brush = CreateSolidBrush(RGB(255, 117, 24));
		pen = CreatePen(PS_SOLID, 2, RGB(255, 201, 14));
		font = (HFONT)GetStockObject(ANSI_VAR_FONT);
		return true;
	}

	virtual void Terminate()
	{
		DeleteObject((HGDIOBJ)brush);
		DeleteObject((HGDIOBJ)pen);
		delete this;
	}
};

__declspec(dllexport) Painter* __stdcall CreateBackgroundPainter()
{
	return new BackgroundPainter();
}