win API 프로그램에서 DrawImage를 쓸 수 있는 방법이 궁금합니다.

#include <windows.h>
#include <tchar.h>
#include <Gdiplus.h>
#pragma comment(lib, "gdiplus.lib")
using namespace Gdiplus;
 
 
 
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd) {
	WNDCLASS wndCls;
	wndCls.cbClsExtra=wndCls.cbWndExtra=0;
	wndCls.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
	wndCls.hInstance=hInstance;
	wndCls.hCursor=LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW));
	wndCls.hIcon=NULL;
	wndCls.lpszClassName=_T("test180 class");
	wndCls.lpszMenuName=NULL;
	wndCls.lpfnWndProc=WndProc;
	wndCls.style=CS_HREDRAW | CS_VREDRAW;
	RegisterClass(&wndCls);
	HWND hwnd=CreateWindow(wndCls.lpszClassName, _T("test180 window"), WS_OVERLAPPEDWINDOW, 100, 100, 500, 500, NULL, NULL, hInstance, NULL);
	ShowWindow(hwnd, nShowCmd);
	//PostMessage(hwnd, WM_USER, 0, 0); 
	MSG msg;
	while( GetMessage(&msg, NULL, 0, 0) ) {
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
 
	return 0;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam) {
	switch(message) {
		case WM_PAINT:
			{
				//HDC mainHdc=GetDC(hwnd);
				PAINTSTRUCT pst;
				HDC mainHdc=BeginPaint(hwnd, &pst);
				Graphics graphic(mainHdc);
 
 
				Image image1(L"grim.jpg");
				graphic.DrawImage(&image1, 0, 0);//여기서 이미지가 제대로 화면에 출력되지 않는군요.  방법이 없을까요?
			TextOut(mainHdc, 0, 0, _T("download"), _tcslen(_T("download")));
 
 
				EndPaint(hwnd, &pst);
			}
			return 0;
		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;
	}
	return DefWindowProc(hwnd, message, wparam, lparam);
}