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ボタンを操作する

#include <windows.h>

HWND button;

LRESULT CALLBACK WndProc(HWND hwnd , UINT msg , WPARAM wp , LPARAM lp) {
	switch (msg) {
	case WM_DESTROY:
		PostQuitMessage(0);
		return 0;
	case WM_COMMAND:
		MessageBox(hwnd , TEXT("Kitty on you lap") , TEXT("") , MB_OK);
		return 0;
	case WM_RBUTTONDOWN:
		SendMessage(button , BM_CLICK , 0 , 0);
		return 0;
	case WM_KEYDOWN:
		SendMessage(button , BM_SETSTATE , TRUE , 0);
		return 0;
	case WM_KEYUP:
		SendMessage(button , BM_SETSTATE , FALSE , 0);
		return 0;
	}
	return DefWindowProc(hwnd , msg , wp , lp);
}

int WINAPI WinMain(HINSTANCE hInstance , HINSTANCE hPrevInstance ,
			PSTR lpCmdLine , int nCmdShow ) {
	HWND hwnd;
	MSG msg;
	WNDCLASS winc;

	winc.style		= CS_HREDRAW | CS_VREDRAW;
	winc.lpfnWndProc	= WndProc;
	winc.cbClsExtra	= winc.cbWndExtra	= 0;
	winc.hInstance		= hInstance;
	winc.hIcon		= LoadIcon(NULL , IDI_APPLICATION);
	winc.hCursor		= LoadCursor(NULL , IDC_ARROW);
	winc.hbrBackground	= (HBRUSH)GetStockObject(WHITE_BRUSH);
	winc.lpszMenuName	= NULL;
	winc.lpszClassName	= TEXT("KITTY");

	if (!RegisterClass(&winc)) return -1;

	hwnd = CreateWindow(
			TEXT("KITTY") , TEXT("Kitty on your lap") ,
			WS_OVERLAPPEDWINDOW | WS_VISIBLE ,
			CW_USEDEFAULT , CW_USEDEFAULT ,
			CW_USEDEFAULT , CW_USEDEFAULT ,
			NULL , NULL , hInstance , NULL
	);

	button = CreateWindow(
			TEXT("BUTTON") , TEXT("Kitty") ,
			WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON ,
			0 , 0 , 100 , 30 ,
			hwnd , NULL , hInstance , NULL
	);

	if (hwnd == NULL) return -1;

	while(GetMessage(&msg , NULL , 0 , 0)) DispatchMessage(&msg);
	return msg.wParam;
}