[Win32 & GDI+Flat] 用分层窗口实现简单仿Aero透明效果

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首先说一下GDI+Flat：我有写过一个GDI+Flat的系列博客，一共有10篇，都是顺着的，这是第一篇：GdiplusFlat（1）GDI+平面API：用GDI的思想进行GDI+编程，有兴趣的可以看一看。因为本篇中的绘图函数都是用的GDI+Flat，因此我们需要自己声明函数，自己定义数据结构，只用Win32和c语言的基本数据类型。

好了，废话不多说，先上图：

测试结果：XP、Win7（Areo/Basic）、Win8.1、Win10下都能很好的工作

如果觉得标题栏和边框不好看，可以改颜色，也可以改成渐变的，还可以用图片，比如画个透明玻璃的PNG图片，如果是带阴影的玻璃的图片，就和Win7的Aero差不多了，可惜我不会PS。

源代码如下：

#include "stdafx.h"
//#include <gdiplus.h>
//#include <gdiplusflat.h>
#pragma comment(lib,"gdiplus.lib")//very important

#include <windows.h>
#include <windowsx.h>
#pragma comment(lib,"user32.lib")
#pragma comment(lib,"gdi32.lib")

#pragma comment(lib,"Msimg32.lib")

#include<OleCtl.h>
#pragma comment(lib,"OleAut32.lib")

//GDI+Flat

#define ARGB(a,r,g,b) ((int)(((BYTE)a)<<24)|(((BYTE)r)<<16)|(((BYTE)g)<<8)|((BYTE)b))

typedef struct _GdiplusStartupInput{
	unsigned int GdiplusVersion;
	unsigned int DebugEventCallback;
	BOOL SuppressBackgroundThread;
	BOOL SuppressExternalCodecs;
}GdiplusStartupInput;

extern "C" int WINAPI GdiplusStartup(int* token, GdiplusStartupInput *input, int *output);
extern "C" void WINAPI GdiplusShutdown(int token);
extern "C" int WINAPI GdipCreateFromHDC(HDC hdc, int* graphics);
extern "C" int WINAPI GdipDeleteGraphics(int graphics);
//画笔
extern "C" int WINAPI GdipCreatePen1(unsigned int argb_color, float width, int unit, int** pen);
extern "C" int WINAPI GdipDeletePen(int* pen);
//画矩形 画直线
extern "C" int WINAPI GdipDrawRectangle(int graphics, int* pen, float x, float y, float width, float height);
extern "C" int WINAPI GdipDrawLine(int graphics, int* pen, float x1, float y1, float x2, float y2);
//画刷
typedef struct _PointF{
	float x;
	float y;
}PointF;
extern "C" int WINAPI GdipCreateSolidFill(unsigned int argb_color, int** brush);
extern "C" int WINAPI GdipCreateLineBrush(PointF* point1, PointF* point2, unsigned int argb_color1, unsigned int argb_color2, int wrapMode, int** lineGradient);
extern "C" int WINAPI GdipDeleteBrush(int* brush);
//画填充矩形
extern "C" int WINAPI GdipFillRectangle(int graphics, int* brush, float x, float y, float width, float height);
//画图片
extern "C" int WINAPI GdipLoadImageFromFile(WCHAR* filename, int** image);
extern "C" int WINAPI GdipLoadImageFromStream(LPSTREAM stream, int** image);
extern "C" int WINAPI GdipGetImageDimension(int* image, float* width, float* height);
extern "C" int WINAPI GdipDrawImageRect(int graphics, int* image, float x, float y, float width, float height);
extern "C" int WINAPI GdipDisposeImage(int* image);
//画文字
typedef struct _RectF{
	float x;
	float y;
	float Width;
	float Height;
}RectF;
extern "C" int WINAPI GdipSetTextRenderingHint(int graphics, int mode);
extern "C" int WINAPI GdipSetSmoothingMode(int graphics, int smoothingMode);
extern "C" int WINAPI GdipCreateFontFamilyFromName(WCHAR* name, int* fontCollection, int** fontFamily);
extern "C" int WINAPI GdipCreateStringFormat(int formatAttributes, short language, int** format);
extern "C" int WINAPI GdipSetStringFormatAlign(int* format, int align);
extern "C" int WINAPI GdipSetStringFormatLineAlign(int* format, int align);
extern "C" int WINAPI GdipCreateFont(int* fontFamily, float emSize, int style, int unit, int** font);
extern "C" int WINAPI GdipDrawString(int graphics, WCHAR* string, int length, int* font, RectF* layoutRect, int* stringFormat, int* brush);
extern "C" int WINAPI GdipDeleteFont(int* font);
extern "C" int WINAPI GdipDeleteStringFormat(int* format);
extern "C" int WINAPI GdipDeleteFontFamily(int* fontFamily);

int token;
int* pen;
int* brush;
int* image;

void WINAPI MyDrawText(HDC hdc, LPWSTR str, LONG left, LONG top, LONG width, LONG height, BOOL iscenter, COLORREF color = 0){
	int graphics;

	GdipCreateFromHDC(hdc, &graphics);//创建Graphics对象
	GdipCreateSolidFill(color, &brush);//创建单色画刷

	GdipSetTextRenderingHint(graphics, 3);//设置Graphics对象的文本渲染模式
	int* fontfamily;
	GdipSetSmoothingMode(graphics, 4);//设置Graphics对象的渲染质量
	GdipCreateFontFamilyFromName(L"宋体", NULL, &fontfamily);//创建一个基于指定的字体系列的FontFamily对象
	int* format;
	GdipCreateStringFormat(0, 0, &format);//创建一个基于字符串的格式标志和语言的 StringFormat 对象
	int* font;
	GdipCreateFont(fontfamily, 12, 0, 2, &font);//创建字体
	RectF rect; rect = { left, top, width, height };
	GdipDrawString(graphics, str, -1, font, &rect, 0, brush);//画文字

	GdipDeleteFont(font);//销毁指定Font对象，释放资源
	GdipDeleteStringFormat(format);//销毁指定StringFormat对象，释放资源
	GdipDeleteFontFamily(fontfamily);//销毁指定FontFamily对象，释放资源
	GdipDeleteBrush(brush);//销毁画刷

	GdipDeleteGraphics(graphics);//销毁Graphics对象


}//参数：设备上下文句柄，要绘制的字符串，x位置，y位置，宽度，高度，是否绘制在矩形中央，argb颜色


//*************************************************************
LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam);

WNDCLASS wc;
const TCHAR* AppName = TEXT("MyWindowClass1");
HWND hwnd1;

HDC mdc, mdc2;

int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
	_In_opt_ HINSTANCE hPrevInstance,
	_In_ LPTSTR    lpCmdLine,
	_In_ int       nCmdShow)
{
	//GDI+开启
	GdiplusStartupInput StartupInput = { 0 };
	StartupInput.GdiplusVersion = 1;
	if (GdiplusStartup(&token, &StartupInput, NULL))MessageBox(0, TEXT("GdiPlus开启失败"), TEXT("错误"), MB_ICONERROR);

	//这里是在构建窗口类结构
	wc.style = CS_HREDRAW | CS_VREDRAW;
	wc.lpfnWndProc = WndProc;//窗口回调函数指针
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = hInstance;//实例句柄
	wc.hIcon = LoadIcon(hInstance, TEXT("ICON_1"));
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);//默认指针
	wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
	wc.lpszMenuName = NULL;
	wc.lpszClassName = AppName;//窗口类名

	//注册窗口类
	if (!RegisterClass(&wc))
	{
		MessageBox(NULL, TEXT("注册窗口类失败!"), TEXT("错误"), MB_ICONERROR);
		return 0;
	}

	//创建窗口
	int style = WS_OVERLAPPEDWINDOW;
	hwnd1 = CreateWindowEx(WS_EX_LAYERED | WS_EX_TOPMOST, AppName, TEXT("窗口标题"), style, 0, 0, 0, 0, 0, LoadMenu(hInstance, TEXT("MENU1")), hInstance, 0);
	if (hwnd1 == NULL)
	{
		MessageBox(NULL, TEXT("创建窗口失败!"), TEXT("错误"), MB_ICONERROR);
		return 0;
	}
	//无边框窗口
	SetWindowLong(hwnd1, GWL_STYLE, WS_OVERLAPPED | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS);
	SetWindowPos(hwnd1, HWND_TOP, 50, 50, 500, 500, SWP_SHOWWINDOW);

	mdc = CreateCompatibleDC(0);//创建内存DC
	BITMAPINFO bitmapinfo;
	RtlZeroMemory(&bitmapinfo, sizeof(BITMAPINFO));

	bitmapinfo.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
	bitmapinfo.bmiHeader.biWidth = 500;
	bitmapinfo.bmiHeader.biHeight = 500;
	bitmapinfo.bmiHeader.biPlanes = 1;
	bitmapinfo.bmiHeader.biBitCount = 32;

	HBITMAP b, old;
	b = CreateDIBSection(0, &bitmapinfo, 0, 0, 0, 0);
	old = (HBITMAP)SelectObject(mdc, b);
	if (old != NULL){
		DeleteObject(old);
	}
	DeleteObject(b);

	int graphics;
	GdipCreateFromHDC(mdc, &graphics);//创建Graphics对象

	GdipCreateSolidFill(0x80FFFFFF, &brush);//创建画刷，这是整体的背景，有透明度
	GdipFillRectangle(graphics, brush, 0, 0, 500, 500);//画填充矩形
	GdipDeleteBrush(brush);//销毁画刷

	GdipCreatePen1(ARGB(200, 0, 157, 225), 1, 2, &pen);//创建画笔
	GdipDrawRectangle(graphics, pen, 0, 0, 499, 499);//画矩形
	GdipDeletePen(pen);//销毁画笔

	MyDrawText(mdc, L"神奇的分层窗口", 25, 8, 0, 0, true, ARGB(254,0,0,0));//画文字，注意透明度用254

	GdipLoadImageFromFile(L"D:\\1.png", &image);//创建Image对象
	GdipDrawImageRect(graphics, image, 3, 3, 20, 20);//画图片
	GdipDisposeImage(image);//销毁图片，释放资源

	GdipCreateSolidFill(ARGB(255, 255, 255, 255), &brush);
	GdipFillRectangle(graphics, brush, 5, 30, 490, 465);//这是画里面的背景
	GdipDeleteBrush(brush);

	GdipDeleteGraphics(graphics);//销毁Graphics对象

	POINT point; point.x = 0; point.y = 0;//更新分层窗口
	SIZE size; size.cx = 500; size.cy = 500;
	BLENDFUNCTION blend;
	blend.BlendOp = AC_SRC_OVER;
	blend.BlendFlags = 0;
	blend.AlphaFormat = AC_SRC_ALPHA;
	blend.SourceConstantAlpha = 255;
	UpdateLayeredWindow(hwnd1, NULL, NULL, &size, mdc, &point, 0, &blend, ULW_ALPHA);//。。。。。。更新分层窗口

	//显示、更新窗口
	ShowWindow(hwnd1, nCmdShow);
	UpdateWindow(hwnd1);

	//消息循环
	MSG msg;
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}

	//GDI+关闭
	GdiplusShutdown(token);//可以把这个写在消息循环后面，程序退出就销毁，或者在不需要GDI+时调用，比如GDI+窗口的WM_DESTROY消息里调用
	return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	switch (uMsg){
	case WM_CREATE:
		return 0;
		break;
	case WM_DESTROY://窗口已经销毁
		PostQuitMessage(0);//退出消息循环，结束应用程序
		return 0;
		break;
	case WM_LBUTTONDOWN:
		//让无边框窗口能够拖动(在窗口客户区拖动)
		PostMessage(hwnd, WM_SYSCOMMAND, 61458, 0);
		break;
	default:
		break;
	}
	return DefWindowProc(hwnd, uMsg, wParam, lParam);//其他消息交给系统处理
}

这里要说明一下：

1。UpdateLayeredWindow以后就不能在WM_PAINT里绘图了，但是WM_PAINT消息依旧响应。

2。需要作图时，应该先把图画到内存DC里，然后再调用UpdateLayeredWindow

3。或者在这个窗口上面再加一个窗口，在WM_MOVING里面控制另一个窗口移动，要不然分层窗口上是不能放控件的，只能自己一个个画上去