DWM 相关实现代码 [自用]

· 1. DWM 缩略图和模糊隐藏实现半透明

#include <windows.h>
#include <dwmapi.h>
#include <string>
#pragma comment(lib, "dwmapi.lib")// 检查 UWP 窗口是否可见
bool IsUWPWindowVisible(HWND hwnd) {DWORD cloaked = 0;DwmGetWindowAttribute(hwnd, DWMWA_CLOAKED, &cloaked, sizeof(cloaked));return (cloaked == 0);
}bool IsBadWindow(HWND hwnd) {wchar_t title[256];wchar_t className[256];GetWindowTextW(hwnd, title, 256);GetClassNameW(hwnd, className, 256);LPCWSTR badTitleList[] = { L"NVIDIA", L"Xaml" };for (LPCWSTR badTitle : badTitleList) {if (wcsstr(title, badTitle) != nullptr) {return true;}}return false;
}void UpdateInfoWindow(HWND infoHwnd, HWND mainHwnd) {if (infoHwnd) {RECT mdrc;GetWindowRect(mainHwnd, &mdrc);// 获取屏幕工作区和任务栏的位置信息RECT rcWorkArea = { 0 };SystemParametersInfoW(SPI_GETWORKAREA, 0, &rcWorkArea, 0);HWND hTrayWnd = FindWindowW(L"Shell_TrayWnd", nullptr);// 计算任务栏是否遮挡信息窗口bool taskbarVisible = false;if (IsWindow(hTrayWnd)&& IsWindowVisible(hTrayWnd)) {RECT tbrc;GetWindowRect(hTrayWnd, &tbrc);if (tbrc.top >= rcWorkArea.bottom && mdrc.bottom + 50 > tbrc.top) {// 任务栏在底部且信息窗口底部超出工作区域底部taskbarVisible = true;}}if (taskbarVisible) {// 将信息窗口移动到窗口上方SetWindowPos(infoHwnd, nullptr, mdrc.left + 10, mdrc.top - 110,mdrc.right - mdrc.left - 25,100, SWP_NOZORDER | SWP_SHOWWINDOW);}else {// 将信息窗口移动到窗口底部SetWindowPos(infoHwnd, nullptr, mdrc.left + 10, mdrc.bottom,mdrc.right - mdrc.left - 25,100, SWP_NOZORDER | SWP_SHOWWINDOW);}}
}LRESULT CALLBACK InfoWindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {switch (uMsg) {case WM_PAINT: {PAINTSTRUCT ps;HDC hdc = BeginPaint(hwnd, &ps);RECT rc;GetClientRect(hwnd, &rc);// 获取目标窗口信息HWND targetHwnd = (HWND)GetWindowLongPtrW(hwnd, GWLP_USERDATA);if (targetHwnd) {wchar_t title[256];wchar_t className[256];GetWindowTextW(targetHwnd, title, 256);GetClassNameW(targetHwnd, className, 256);wchar_t info[512];swprintf(info, 512, L"Title: %s\nClass: %s\nHandle: 0x%llX",title, className, (UINT_PTR)targetHwnd);// 绘制信息文本SetBkMode(hdc, TRANSPARENT);SetTextColor(hdc, RGB(0, 0, 0));DrawTextW(hdc, info, -1, &rc, DT_LEFT | DT_TOP | DT_NOPREFIX);}EndPaint(hwnd, &ps);return 0;}default:break;}return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}LRESULT CALLBACK WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {static HTHUMBNAIL thumbnail = NULL;static HWND infoHwnd = NULL;static HWND oldBehindWnd = NULL;// 最小窗口尺寸const int MIN_WIDTH = 100;const int MIN_HEIGHT = 100;switch (uMsg) {case WM_CREATE: {// 创建子窗口用于显示信息HINSTANCE hInstance = (HINSTANCE)GetWindowLongPtrW(hwnd, GWLP_HINSTANCE);const wchar_t INFO_CLASS_NAME[] = L"InfoWindowClass";WNDCLASS wc = {};wc.lpfnWndProc = InfoWindowProc;wc.hInstance = hInstance;wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);  // 白色背景wc.lpszClassName = INFO_CLASS_NAME;RegisterClassW(&wc);infoHwnd = CreateWindowExW(WS_EX_TRANSPARENT | WS_EX_NOACTIVATE,  // 扩展窗口样式INFO_CLASS_NAME,                 // 窗口类名nullptr,                         // 窗口标题WS_POPUP,                        // 窗口样式0, 0, 800, 100,                  // 窗口尺寸hwnd, nullptr, hInstance, nullptr);if (infoHwnd == nullptr) {return 0;}SetLayeredWindowAttributes(infoHwnd, RGB(0,0,0), 0, LWA_COLORKEY);// 初始化信息窗口的位置RECT rc;GetWindowRect(hwnd, &rc);SetWindowPos(infoHwnd, nullptr, rc.left + 10, rc.bottom, 0, 0,SWP_NOZORDER | SWP_NOSIZE | SWP_SHOWWINDOW);}case WM_ACTIVATE: {// 查找第一个可见且尺寸不小于最小尺寸的后台窗口HWND hwndBehind = GetWindow(hwnd, GW_HWNDNEXT);while (hwndBehind) {if (IsWindowVisible(hwndBehind)&& IsUWPWindowVisible(hwndBehind)&& !IsBadWindow(hwndBehind)) {RECT rcBehind;GetWindowRect(hwndBehind, &rcBehind);int width = rcBehind.right - rcBehind.left;int height = rcBehind.bottom - rcBehind.top;if (width >= MIN_WIDTH && height >= MIN_HEIGHT) {break;}}hwndBehind = GetWindow(hwndBehind, GW_HWNDNEXT);}if (oldBehindWnd != hwndBehind) {// 注销当前缩略图if (thumbnail) {DwmUnregisterThumbnail(thumbnail);thumbnail = NULL;}if (hwndBehind) {oldBehindWnd = hwndBehind;// 注册后台窗口的缩略图DwmRegisterThumbnail(hwnd, hwndBehind, &thumbnail);RECT rcBehindWnd;GetWindowRect(hwndBehind, &rcBehindWnd);SetWindowPos(hwnd, nullptr,0, 0,rcBehindWnd.right - rcBehindWnd.left,rcBehindWnd.bottom - rcBehindWnd.top + 50,SWP_NOZORDER | SWP_NOMOVE | SWP_SHOWWINDOW);// 更新缩略图属性RECT rcClient;GetClientRect(hwnd, &rcClient);DWM_THUMBNAIL_PROPERTIES dpt;dpt.dwFlags = DWM_TNP_RECTDESTINATION | DWM_TNP_OPACITY;dpt.rcDestination = rcClient;dpt.opacity = (BYTE)(255 * 0.7);  // 设置透明度为70%DwmUpdateThumbnailProperties(thumbnail, &dpt);// 设置子窗口的用户数据为目标窗口句柄SetWindowLongPtrW(infoHwnd, GWLP_USERDATA, (LONG_PTR)hwndBehind);InvalidateRect(infoHwnd, NULL, TRUE);  // 重新绘制子窗口}else {// 设置子窗口的用户数据为目标窗口句柄SetWindowLongPtrW(infoHwnd, GWLP_USERDATA, (LONG_PTR)NULL);MessageBoxW(NULL,L"没有找到合适窗口", L"提示",MB_OK | MB_ICONINFORMATION |MB_APPLMODAL | MB_TOPMOST);}}return 0;}case WM_DESTROY:if (thumbnail) {DwmUnregisterThumbnail(thumbnail);}PostQuitMessage(0);return 0;case WM_SIZE: {if (thumbnail) {RECT rcClient;GetClientRect(hwnd, &rcClient);// 窗口大小改变时重新扩展DWM框架到客户区MARGINS margins = { 0, 0, 0, rcClient.bottom - rcClient.top };DwmExtendFrameIntoClientArea(hwnd, &margins);// 更新缩略图属性DWM_THUMBNAIL_PROPERTIES dpt;dpt.dwFlags = DWM_TNP_RECTDESTINATION | DWM_TNP_OPACITY;dpt.rcDestination = rcClient;dpt.opacity = (BYTE)(255 * 0.7);  // 设置透明度为70%DwmUpdateThumbnailProperties(thumbnail, &dpt);}// 更新信息窗口的位置UpdateInfoWindow(infoHwnd, hwnd);return 0;}case WM_MOVE: {// 更新信息窗口的位置UpdateInfoWindow(infoHwnd, hwnd);return 0;}case WM_PAINT: {PAINTSTRUCT ps;HDC hdc = BeginPaint(hwnd, &ps);RECT rc;GetClientRect(hwnd, &rc);// 绘制半透明背景HBRUSH hBrush = CreateSolidBrush(RGB(255, 255, 255));SetBkMode(hdc, TRANSPARENT);FillRect(hdc, &rc, hBrush);DeleteObject(hBrush);EndPaint(hwnd, &ps);return 0;}default:return DefWindowProcW(hwnd, uMsg, wParam, lParam);}return 0;
}int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE, PWSTR pCmdLine, int nCmdShow) {// 注册窗口类const wchar_t CLASS_NAME[] = L"TransparentWindowClass";WNDCLASS wc = {};wc.lpfnWndProc = WindowProc;wc.hInstance = hInstance;wc.hbrBackground = (HBRUSH)GetStockObject(NULL_BRUSH);  // 防止背景重绘wc.lpszClassName = CLASS_NAME;RegisterClassW(&wc);// 创建窗口HWND hwnd = CreateWindowExW(WS_EX_NOREDIRECTIONBITMAP,  // 扩展窗口样式CLASS_NAME,                 // 窗口类名L"Transparent Window",      // 窗口标题WS_OVERLAPPEDWINDOW,        // 窗口样式CW_USEDEFAULT, CW_USEDEFAULT, 1000, 600,nullptr, nullptr, hInstance, nullptr);if (hwnd == nullptr) {return 0;}// 使用 DWM API 设置毛玻璃效果DWM_BLURBEHIND bb = { 0 };bb.dwFlags = DWM_BB_ENABLE | DWM_BB_BLURREGION;bb.fEnable = TRUE;bb.hRgnBlur = NULL;DwmEnableBlurBehindWindow(hwnd, &bb);// 设置标题栏颜色为深色（示例为灰色）COLORREF grey = RGB(30, 30, 30);DwmSetWindowAttribute(hwnd, DWMWA_CAPTION_COLOR, &grey, sizeof(grey));// 显示窗口ShowWindow(hwnd, nCmdShow);UpdateWindow(hwnd);// 消息循环MSG msg = {};while (GetMessageW(&msg, nullptr, 0, 0)) {TranslateMessage(&msg);DispatchMessageW(&msg);}return 0;
}

效果图：

窗口缩略图实现背景墙（自动识别窗口切换）

窗口切换和大小跟随： 

演示截图 2

· 2. 更多代码......

（...）

---

本文发布于：2024.07.08