Starter code for a minimal win32 application with idle processing

Win32AppStarter.cpp

#include <windows.h>

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

void RunMessageLoop(const MSG& msg);
void OnIdle(const MSG& msg);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	const wchar_t szClassName[] = L"myWindowClass";

	WNDCLASSEX wc;
	HWND hwnd;
	MSG msg;

	wc.cbSize = sizeof(WNDCLASSEX);
	wc.style = 0;
	wc.lpfnWndProc = WndProc;
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInstance;
	wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wc.lpszMenuName = NULL;
	wc.lpszClassName = szClassName;
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

	RegisterClassEx(&wc);
	hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, szClassName, L"myWindowName", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 240, 120, NULL, NULL, hInstance, NULL);
	ShowWindow(hwnd, nCmdShow);
	UpdateWindow(hwnd);

	RunMessageLoop(msg);

	return msg.wParam;
}

void OnIdle(const MSG& msg)
{
	// Idle state processing
}

void RunMessageLoop(const MSG& msg)
{
	while (WM_QUIT != msg.message)
	{
		while (PeekMessage(const_cast<LPMSG>(&msg), NULL, 0, 0, PM_REMOVE) > 0) //Or use an if statement
		{
			if (msg.message == WM_QUIT)
				return;

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

		OnIdle(msg);
	}
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	switch (message)
	{
	case WM_CREATE:
		break;

	case WM_CLOSE:
		PostQuitMessage(0);
		break;

	default:
		return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}