///////////////////////////////////////////////////////
///
///  このソースコードを引用・改変した結果如何なる
///　損害が発生しても、著者はは責任を負いません。
///  広島大学　脳外科　橋詰顕
///
////////////////////////////////////////////////////////

#include<windows.h>

LRESULT CALLBACK WindowProcedure(HWND hWindow,UINT message,WPARAM wParameter,LPARAM lParameter);

int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,PSTR szCmdLine,int iCmdShow)
{
	//WNDCLASSの設計
	WNDCLASS WindowClass;
	WindowClass.style=CS_HREDRAW | CS_VREDRAW;
	WindowClass.lpfnWndProc=WindowProcedure;
	WindowClass.cbClsExtra=0;
	WindowClass.cbWndExtra=0;
	WindowClass.hInstance=hInstance;
	WindowClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);
	WindowClass.hCursor=LoadCursor(NULL,IDC_ARROW);
	WindowClass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);
	WindowClass.lpszMenuName=NULL;
	WindowClass.lpszClassName="WindowClassName";

	//設計したWNDCLASSの登録
	if(!RegisterClass(&WindowClass))
	{
		MessageBox(NULL,"設計したWNDCLASSの設計に失敗しました","Error!",MB_ICONERROR);
		return 0;
	}

	//Windowの作成
	HWND hWindow=CreateWindow(
		"WindowClassName",						//window class name
		"Let's make MEG task",					//title
		WS_OVERLAPPEDWINDOW | WS_VISIBLE,		//Window Style
		CW_USEDEFAULT,CW_USEDEFAULT,			//top left
		CW_USEDEFAULT,CW_USEDEFAULT,			//width,height
		NULL,									//parent window handle
		(HMENU)NULL,									//window menu handle
		hInstance,								//application handle
		NULL);									//creation parameter
	ShowWindow(hWindow,SW_SHOW);	

	MSG  message;
	
	//無限ループです。
	while(GetMessage(&message,NULL,0,0))
	{
		TranslateMessage(&message);
		DispatchMessage(&message);
	}

	return 0;	
}

LRESULT CALLBACK WindowProcedure(HWND hWindow,UINT message,WPARAM wParameter,LPARAM lParameter)
{
	static int WindowWidth=640;
	static int WindowHeight=480;
	LONG lResult;	//画面を640x480に変更できたかどうか	
	switch(message)
	{
	case WM_CREATE:
		//画面を640x480にする
		DEVMODE DeviceMode;
		DeviceMode.dmSize		=sizeof(DEVMODE);
		DeviceMode.dmFields		=DM_PELSWIDTH | DM_PELSHEIGHT;
		DeviceMode.dmPelsWidth	=WindowWidth;
		DeviceMode.dmPelsHeight	=WindowHeight;
		lResult=ChangeDisplaySettings(&DeviceMode,CDS_FULLSCREEN);
		if(lResult!=DISP_CHANGE_SUCCESSFUL)
		{
			MessageBox(hWindow,"full screenの変換は失敗しました","",MB_ICONERROR);
			break;
		}
		SetWindowPos(hWindow,HWND_TOPMOST,0,0,WindowWidth,WindowHeight,0);
		break;
	case WM_PAINT:
		//Hello Worldと描画
		PAINTSTRUCT PaintStruct;
		BeginPaint(hWindow,&PaintStruct);
		TextOut(PaintStruct.hdc,10,10,"Hello World",11);
		EndPaint(hWindow,&PaintStruct);
		break;
	case WM_DESTROY:
		//画面モードを元に戻す
		ChangeDisplaySettings(&DeviceMode,NULL);
		PostQuitMessage(0);
		return 0;
	}
	return DefWindowProc(hWindow,message,wParameter,lParameter);
}