#define GDIPVER 0x0110 //定义高版本的GDI+(1.1)
#include <tchar.h>
#include <windows.h>
#include <ObjIdl.h>
#include <stdio.h>
#include <GdiPlus.h>
#pragma comment(lib,"GdiPlus.lib")
using namespace Gdiplus;

#include <dwmapi.h>
#pragma comment(lib,"dwmapi.lib")

//Aero效果是否已启用
BOOL IsCompositionEnabled()
{
	BOOL bEnabled,bResult;
	bResult = (SUCCEEDED(DwmIsCompositionEnabled(&bEnabled)) && bEnabled);
	return bResult;
}
//对已分层的窗口启动玻璃效果
HRESULT EnableBlurBehindWindow(HWND hWnd, //窗口句柄
							   BOOL bEnable = TRUE, //启用或禁用
							   HRGN hRgn = 0, //模糊窗体中某个区域
							   BOOL bTransitionOnMaximized = FALSE) //最大化时是否启用
{
	DWM_BLURBEHIND blurBehind = { 0 };
	blurBehind.dwFlags = DWM_BB_ENABLE | DWM_BB_TRANSITIONONMAXIMIZED;
	blurBehind.fEnable = bEnable;
	blurBehind.fTransitionOnMaximized = bTransitionOnMaximized;
	if (bEnable && hRgn != NULL)
	{
		blurBehind.dwFlags |= DWM_BB_BLURREGION;
		blurBehind.hRgnBlur = hRgn;
	}
	return DwmEnableBlurBehindWindow(hWnd,&blurBehind);
}
LRESULT WINAPI WinProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
	switch(msg)
	{
	case WM_CREATE:
		{
			HDC hDC = GetDC(hWnd);

			//获得窗口宽高
			RECT rcClient;
			GetClientRect(hWnd,&rcClient);
			UINT uWidth,uHeight;
			uWidth = rcClient.right - rcClient.left;
			uHeight = rcClient.bottom - rcClient.top;

			//创建一个和窗口宽高相同的内存DC并创建相应位图
			HDC hMemDC = CreateCompatibleDC(hDC);
			HBITMAP hBitmap = CreateCompatibleBitmap(hDC,uWidth,uHeight);
			HBITMAP hBitmapOld = (HBITMAP)SelectObject(hMemDC,hBitmap);
			SetBkMode(hMemDC, TRANSPARENT);
			//对该内存DC进绘制Alpha图像
			{
				Gdiplus::Graphics grap(hMemDC);
				Gdiplus::LinearGradientBrush lgb(
					Point(0,0),
					Point(0,uHeight),
					Color(0,255,0,255),
					Color(255,0,255,0));
				grap.FillRectangle(&lgb,0,0,uWidth,uHeight);

				SolidBrush b(Color(0xFF,0x00,0x00,0xFF)); //构造纯色画刷
				FontFamily ff(L"Times New Roman"); //构造字体族
				Font f( //构造字体
					&ff, //字体族
					24, //字体尺寸
					FontStyleRegular, //字体样式
					UnitPixel); //大小单元(像素)
				PointF p(10.0F,20.0F); //构造精度点

				grap.DrawString( //绘制字符串
					L"你好，世界!", //字符串
					-1, //字符串长度(-1为以Null为结束符)
					&f, //字体
					p, //位置
					&b); //颜色
			}

			{
				LPCTSTR lpstrOut = _T("Hello World!!!");
				RECT rc = { 100,100,300,120 };
				SetTextColor( hMemDC, RGB(0xFF,0x00,0x00) | 0xFE000000 );
				DrawText( hMemDC, lpstrOut, _tcslen(lpstrOut), &rc, DT_CENTER | DT_SINGLELINE | DT_VCENTER );
			}
			//设置透明效果
			SIZE size = {uWidth,uHeight};
			POINT point = {0,0};
			BLENDFUNCTION BlendFunc;
			BlendFunc.BlendOp = AC_SRC_OVER;
			BlendFunc.BlendFlags = 0;
			BlendFunc.SourceConstantAlpha = 0xFF;
			BlendFunc.AlphaFormat = AC_SRC_ALPHA;
			UpdateLayeredWindow(
				hWnd,
				NULL,
				NULL,
				&size,
				hMemDC,
				&point,
				RGB(0,0,0),
				&BlendFunc,
				ULW_ALPHA);

			if(IsCompositionEnabled() == TRUE)
			{
				EnableBlurBehindWindow(hWnd,TRUE);
			}

			//释放资源
			SelectObject(hMemDC,hBitmapOld);
			DeleteDC(hMemDC);
			ReleaseDC(hWnd,hDC);
		}
		break;
	case WM_PAINT:
		{
			PAINTSTRUCT PaintStruct;
			HDC hDC = BeginPaint(hWnd,&PaintStruct);
			//在此处添加重绘代码
			EndPaint(hWnd,&PaintStruct);
		}
		break;
	case WM_LBUTTONDOWN:
		{
			PostMessage( hWnd, WM_NCLBUTTONDOWN, HTCAPTION, 0 );
		}
		break;
	case WM_DWMCOMPOSITIONCHANGED:
		EnableBlurBehindWindow(hWnd,IsCompositionEnabled());
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	}
	return DefWindowProc(hWnd, msg, wParam, lParam);
}

INT WINAPI _tWinMain(HINSTANCE hInst, HINSTANCE, LPTSTR, INT)
{
	//初使化GDI+ ----------------------------------------
	ULONG_PTR GdiplusToken;
	GdiplusStartupInput GdiplusStartupInput;
	Status sResult = GdiplusStartup(&GdiplusToken, &GdiplusStartupInput, NULL);
	if(sResult != Ok)return 0;

	WNDCLASSEX WndClassEx = 
	{
		sizeof(WNDCLASSEX), //窗口类大小 
		CS_HREDRAW | CS_VREDRAW, //水平和垂直重绘
		WinProc, //窗口过程
		0L, //窗口类扩展
		0L, //窗口扩展
		GetModuleHandle(NULL), //实例句柄
		LoadIcon(NULL,IDI_APPLICATION), //默认的窗口大图标
		LoadCursor(NULL,IDC_ARROW), //默认的窗口光标
		(HBRUSH)GetStockObject(WHITE_BRUSH),//默认的窗口背景画刷 
		NULL, //默认的窗口菜单名称
		_T("SimpleWindowClass"), //窗口类名
		LoadIcon(NULL,IDI_APPLICATION) //默认的窗口小图像
	};
	RegisterClassEx(&WndClassEx);

	HWND hWnd = CreateWindowEx(
		WS_EX_LAYERED,
		_T("SimpleWindowClass"), //使用的窗口类名
		_T("Simple Window"), //窗口标题
		WS_OVERLAPPEDWINDOW, //窗口样式
		CW_USEDEFAULT, //默认的X坐标
		CW_USEDEFAULT, //默认的Y坐标
		CW_USEDEFAULT, //默认的宽度
		CW_USEDEFAULT, //默认的高度
		GetDesktopWindow(), //父窗口句柄 HWND_MESSAGE为隐藏窗口
		NULL, //菜单句柄
		WndClassEx.hInstance, //主模块句柄
		NULL); //参数.

	ShowWindow(hWnd, SW_SHOWDEFAULT);
	UpdateWindow(hWnd);

	MSG Msg;
	do
	{
		GetMessage(&Msg, NULL, 0U, 0U);
		TranslateMessage(&Msg);
		DispatchMessage(&Msg);
	}while(Msg.message != WM_QUIT);

	UnregisterClass(
		_T("SimpleWindowClass"),
		WndClassEx.hInstance);

	//关闭GDI+ ----------------------------------------
	GdiplusShutdown(GdiplusToken);
	return 0;
}

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