前言

今天要实现一个Win毛玻璃窗口，忘了之前怎么做的了，以为很简单，没想到查了半天资料，问了DeepSeek之类的，没有一个好用的。不得已只能翻找之前的工程，摘出来代码一运行，果然好使。特在此贴上

实现

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#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<windows.h>
#include<WinUser.h>
#include <QtWinExtras/QtWin>

typedef enum _WINDOWCOMPOSITIONATTRIB
{
    WCA_UNDEFINED = 0,
    WCA_NCRENDERING_ENABLED = 1,
    WCA_NCRENDERING_POLICY = 2,
    WCA_TRANSITIONS_FORCEDISABLED = 3,
    WCA_ALLOW_NCPAINT = 4,
    WCA_CAPTION_BUTTON_BOUNDS = 5,
    WCA_NONCLIENT_RTL_LAYOUT = 6,
    WCA_FORCE_ICONIC_REPRESENTATION = 7,
    WCA_EXTENDED_FRAME_BOUNDS = 8,
    WCA_HAS_ICONIC_BITMAP = 9,
    WCA_THEME_ATTRIBUTES = 10,
    WCA_NCRENDERING_EXILED = 11,
    WCA_NCADORNMENTINFO = 12,
    WCA_EXCLUDED_FROM_LIVEPREVIEW = 13,
    WCA_VIDEO_OVERLAY_ACTIVE = 14,
    WCA_FORCE_ACTIVEWINDOW_APPEARANCE = 15,
    WCA_DISALLOW_PEEK = 16,
    WCA_CLOAK = 17,
    WCA_CLOAKED = 18,
    WCA_ACCENT_POLICY = 19,
    WCA_FREEZE_REPRESENTATION = 20,
    WCA_EVER_UNCLOAKED = 21,
    WCA_VISUAL_OWNER = 22,
    WCA_LAST = 23
} WINDOWCOMPOSITIONATTRIB;

struct WINDOWCOMPOSITIONATTRIBDATA
{
    WINDOWCOMPOSITIONATTRIB Attrib;
    PVOID pvData;
    SIZE_T cbData;
} ;

typedef enum _ACCENT_STATE
{
    ACCENT_DISABLED = 0,
    ACCENT_ENABLE_GRADIENT = 1,
    ACCENT_ENABLE_TRANSPARENTGRADIENT = 2,
    ACCENT_ENABLE_BLURBEHIND = 3,
    ACCENT_INVALID_STATE = 4
} ACCENT_STATE;

typedef struct _ACCENT_POLICY
{
    ACCENT_STATE AccentState;
    DWORD AccentFlags;
    DWORD GradientColor;
    DWORD AnimationId;
} ACCENT_POLICY;

typedef BOOL(WINAPI* pfnSetWindowCompositionAttribute)(HWND, struct WINDOWCOMPOSITIONATTRIBDATA*);

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    this->setAttribute(Qt::WA_TranslucentBackground, true);
    this->setWindowFlags(Qt::FramelessWindowHint);

    QString systemVersion = QSysInfo::productType() + " " + QSysInfo::productVersion();

    if(systemVersion.contains("windows 7"))
    {
        QtWin::extendFrameIntoClientArea(this, -1, -1, -1, -1);    //玻璃效果
    }
    else
    {
        HWND hWnd = HWND(this->winId());//HWND(winId());
        HMODULE hUser = GetModuleHandle(L"user32.dll");

        if (hUser)
        {
            pfnSetWindowCompositionAttribute setWindowCompositionAttribute = (pfnSetWindowCompositionAttribute)GetProcAddress(hUser, "SetWindowCompositionAttribute");

            if (setWindowCompositionAttribute)
            {
                ACCENT_POLICY accent = { ACCENT_ENABLE_BLURBEHIND, 0, 0, 0 };
                WINDOWCOMPOSITIONATTRIBDATA data;
                data.Attrib = WCA_ACCENT_POLICY;
                data.pvData = &accent;
                data.cbData = sizeof(accent);
                setWindowCompositionAttribute(hWnd, &data);
            }
        }

        this->update();//加一层半透效果
    }
}

MainWindow::~MainWindow()
{
    delete ui;
}