test.cpp

#include <windows.h>
#include "disp.h"
const char g_class_name[] = "myWindowsClass";
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam);
void display(HWND hwnd, char* s);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
	WNDCLASSEX wc;
	HWND hwnd;
	MSG Msg;

	//First we create a structure describing the window
	wc.cbSize = sizeof(WNDCLASSEX);
	wc.style = 0;
	wc.lpfnWndProc = WndProc;       // N.B. here we specify the name of our function
	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 = g_class_name;
	wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

	// Now we call RegisterClassEx. This is called "registering the window class".
	// It tells the operating system we are here and want a window.
	if (!RegisterClassEx(&wc))
	{
		MessageBox(NULL, "Window Registration Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
		return 0;
	}

	// Ok, the operating system says we can have a window. Now we create it using CreateWindowEx.
	// The parameters here mainly define the appearance of the window: what the border looks like,
	// the title if any, etc.
	hwnd = CreateWindowEx(
		WS_EX_CLIENTEDGE,                         // what the border looks like
		g_class_name,
		"Hello world!!!",                 // text appearing in top bar
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,   // window xpos, ypos, width, height
		NULL, NULL, hInstance, NULL);

	if (hwnd == NULL)
	{
		MessageBox(NULL, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
		return 0;
	}

	ShowWindow(hwnd, nCmdShow);
	UpdateWindow(hwnd);

	/* And finally: the Message Loop. This while loop is perpetually going round and round
	at the "base" of your program, picking up messages from the keyboard, mouse and other
	devices, and calling the WndProc function (i.e. the function specified above when we set
	wc.lpfnWndProc).
	*/
	while (GetMessage(&Msg, NULL, 0, 0) > 0)
	{
		TranslateMessage(&Msg);
		DispatchMessage(&Msg);
	}
	return Msg.wParam;

}


LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) {
	switch (msg)
	{
	case WM_CREATE:
		disp(hwnd);
		return 0;
	case WM_SIZE:
		disp((char*)"hello world");
		return 0;
	case WM_LBUTTONDOWN:
		MessageBox(hwnd, "hello again", "box title", MB_OK);
		return 0;
	case WM_CLOSE:
		DestroyWindow(hwnd);
		return 0;
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	default:
		return DefWindowProc(hwnd, msg, wParam, lParam);
	}
}