win32api.cpp

#include <stdlib.h>
#include <windows.h>

static TCHAR szClassName[] = L"Application";
static TCHAR szWindowName[] = L"Title of the application";

HINSTANCE hInst;

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

int CALLBACK WinMain(HINSTANCE hInstance,
	  				 HINSTANCE hPrevInstance,
					 LPSTR lpCmdLine,
					 int nCmdShow)
{
	WNDCLASS wc = {NULL};

	wc.hInstance = hInstance;	
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.lpfnWndProc = WndProc;
	wc.lpszClassName = szClassName;

	if (!RegisterClass(&wc))
	{
		MessageBox(NULL,
			L"Call to RegisterClass Failed!",
			szWindowName,
			NULL);
		return 1;
	}

	hInst = hInstance;

	HWND hWnd = CreateWindow(
		szClassName,
		szWindowName,
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT,
		500, 100,
		NULL,
		NULL,
		hInstance,
		NULL
	);

	if (!hWnd)
	{
		MessageBox(NULL,
			L"Call to CreateWindow Failed!",
			szWindowName,
			NULL);

		return 1;
	}

	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);

	MSG msg;

	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	return (int)msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hWnd,
						 UINT uMsg,
						 WPARAM wParam,
						 LPARAM lParam)
{
	PAINTSTRUCT ps;
	HDC hdc;
	TCHAR greeting[] = L"Hello, Welcome to Application";

	switch (uMsg)
	{
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);

		TextOut(hdc, 5, 5, greeting, wcslen(greeting));

		EndPaint(hWnd, &ps);
		break;

	case WM_DESTROY:
		PostQuitMessage(0);
		break;

	default:
		return DefWindowProc(hWnd, uMsg, wParam, lParam);
		break;
	}

	return 0;
}