方式一：

BOOL SetWindowDisplayAffinity(HWND hWnd,DWORD dwAffinity );

hWnd:窗口句柄

dwAffinity:

#define WDA_NONE 0x00000000 #define WDA_MONITOR 0x00000001 #define WDA_EXCLUDEFROMCAPTURE 0x00000011

在beta版本下，才有WDA_EXCLUDEFROMCAPTURE

包含在：C:\Program Files (x86)\Windows Kits\10\Include\10.0.19041.0\um\WinUser.h

然鵝，經過測試，并沒有用，被排除的窗口，只是顯示成了黑框。失敗！

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方式二（從webrtc M81摳的）：

Windows放大鏡Magnification API

MagSetWindowFilterList Sets the list of windows to be magnified or the list of windows to be excluded from magnification.BOOL MagSetWindowFilterList(HWND hwnd,DWORD dwFilterMode,int count,HWND *pHWND );

接口MagSetWindowFilterList具有排除指定窗口的功能。

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測試可行，只是稍顯復雜：

//excludewindow.h #pragma once#include <magnification.h> #include <wincodec.h> #include <windows.h>// kMagnifierWindowClass has to be "Magnifier" according to the Magnification // API. The other strings can be anything. static wchar_t kMagnifierHostClass[] = L"ScreenCapturerWinMagnifierHost"; static wchar_t kHostWindowName[] = L"MagnifierHost"; static wchar_t kMagnifierWindowClass[] = L"Magnifier"; static wchar_t kMagnifierWindowName[] = L"MagnifierWindow";class CExcludeWindow { public:CExcludeWindow();virtual ~CExcludeWindow();int SetExcludeWnd(HWND hWnd);bool Init();bool CaptureFrame(); private:typedef BOOL(WINAPI* MagImageScalingCallback)(HWND hwnd,void* srcdata,MAGIMAGEHEADER srcheader,void* destdata,MAGIMAGEHEADER destheader,RECT unclipped,RECT clipped,HRGN dirty);typedef BOOL(WINAPI* MagInitializeFunc)(void);typedef BOOL(WINAPI* MagUninitializeFunc)(void);typedef BOOL(WINAPI* MagSetWindowSourceFunc)(HWND hwnd, RECT rect);typedef BOOL(WINAPI* MagSetWindowFilterListFunc)(HWND hwnd,DWORD dwFilterMode,int count,HWND* pHWND);typedef BOOL(WINAPI* MagSetImageScalingCallbackFunc)(HWND hwnd,MagImageScalingCallback callback);static BOOL WINAPI OnMagImageScalingCallback(HWND hwnd,void* srcdata,MAGIMAGEHEADER srcheader,void* destdata,MAGIMAGEHEADER destheader,RECT unclipped,RECT clipped,HRGN dirty);void OnCaptured(void* data, const MAGIMAGEHEADER& header);HMODULE mag_lib_handle_ = NULL;MagInitializeFunc mag_initialize_func_ = nullptr;MagUninitializeFunc mag_uninitialize_func_ = nullptr;MagSetWindowSourceFunc set_window_source_func_ = nullptr;MagSetWindowFilterListFunc set_window_filter_list_func_ = nullptr;MagSetImageScalingCallbackFunc set_image_scaling_callback_func_ = nullptr;// The hidden window hosting the magnifier control.HWND host_window_ = NULL;// The magnifier control that captures the screen.HWND magnifier_window_ = NULL;// True if the magnifier control has been successfully initialized.bool magnifier_initialized_ = false;// True if the last OnMagImageScalingCallback was called and handled// successfully. Reset at the beginning of each CaptureImage call.bool magnifier_capture_succeeded_ = true; };

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//excludewindow.cpp #include "excludewindow.h" #include <iostream>DWORD GetTlsIndex() {static const DWORD tls_index = TlsAlloc();return tls_index; }CExcludeWindow::CExcludeWindow() { }bool CExcludeWindow::Init() {mag_lib_handle_ = LoadLibraryW(L"Magnification.dll");if (!mag_lib_handle_)return false;// Initialize Magnification API function pointers.mag_initialize_func_ = reinterpret_cast<MagInitializeFunc>(GetProcAddress(mag_lib_handle_, "MagInitialize"));mag_uninitialize_func_ = reinterpret_cast<MagUninitializeFunc>(GetProcAddress(mag_lib_handle_, "MagUninitialize"));set_window_source_func_ = reinterpret_cast<MagSetWindowSourceFunc>(GetProcAddress(mag_lib_handle_, "MagSetWindowSource"));set_window_filter_list_func_ = reinterpret_cast<MagSetWindowFilterListFunc>(GetProcAddress(mag_lib_handle_, "MagSetWindowFilterList"));set_image_scaling_callback_func_ =reinterpret_cast<MagSetImageScalingCallbackFunc>(GetProcAddress(mag_lib_handle_, "MagSetImageScalingCallback"));if (!mag_initialize_func_ || !mag_uninitialize_func_ ||!set_window_source_func_ || !set_window_filter_list_func_ ||!set_image_scaling_callback_func_) {std::cout << "Failed to initialize ScreenCapturerWinMagnifier: "<< "library functions missing.";return false;}BOOL result = mag_initialize_func_();if (!result) {std::cout << "Failed to initialize ScreenCapturerWinMagnifier: "<< "error from MagInitialize " << GetLastError();return false;}HMODULE hInstance = nullptr;result =GetModuleHandleExA(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,reinterpret_cast<char*>(&DefWindowProc), &hInstance);if (!result) {mag_uninitialize_func_();std::cout << "Failed to initialize ScreenCapturerWinMagnifier: "<< "error from GetModulehandleExA " << GetLastError();return false;}// Register the host window class. See the MSDN documentation of the// Magnification API for more infomation.WNDCLASSEXW wcex = {};wcex.cbSize = sizeof(WNDCLASSEX);wcex.lpfnWndProc = &DefWindowProc;wcex.hInstance = hInstance;wcex.hCursor = LoadCursor(nullptr, IDC_ARROW);wcex.lpszClassName = kMagnifierHostClass;// Ignore the error which may happen when the class is already registered.RegisterClassExW(&wcex);// Create the host window.host_window_ =CreateWindowExW(WS_EX_LAYERED, kMagnifierHostClass, kHostWindowName, 0, 0,0, 0, 0, nullptr, nullptr, hInstance, nullptr);if (!host_window_) {mag_uninitialize_func_();std::cout << "Failed to initialize ScreenCapturerWinMagnifier: "<< "error from creating host window "<< GetLastError();return false;}// Create the magnifier control.magnifier_window_ = CreateWindowW(kMagnifierWindowClass, kMagnifierWindowName,WS_CHILD | WS_VISIBLE, 0, 0, 0, 0,host_window_, nullptr, hInstance, nullptr);if (!magnifier_window_) {mag_uninitialize_func_();std::cout << "Failed to initialize ScreenCapturerWinMagnifier: "<< "error from creating magnifier window "<< GetLastError();return false;}// Hide the host window.ShowWindow(host_window_, SW_HIDE);// Set the scaling callback to receive captured image.result = set_image_scaling_callback_func_(magnifier_window_,&CExcludeWindow::OnMagImageScalingCallback);if (!result) {mag_uninitialize_func_();std::cout << "Failed to initialize ScreenCapturerWinMagnifier: "<< "error from MagSetImageScalingCallback "<< GetLastError();return false;}return true; }CExcludeWindow::~CExcludeWindow() {}BOOL CExcludeWindow::OnMagImageScalingCallback(HWND hwnd,void* srcdata,MAGIMAGEHEADER srcheader,void* destdata,MAGIMAGEHEADER destheader,RECT unclipped,RECT clipped,HRGN dirty) {CExcludeWindow* owner =reinterpret_cast<CExcludeWindow*>(TlsGetValue(GetTlsIndex()));TlsSetValue(GetTlsIndex(), nullptr);owner->OnCaptured(srcdata, srcheader);return TRUE; }void CExcludeWindow::OnCaptured(void* data, const MAGIMAGEHEADER& header) {// Verify the format.// TODO(jiayl): support capturing sources with pixel formats other than RGBA.int captured_bytes_per_pixel = header.cbSize / header.width / header.height;if (header.format != GUID_WICPixelFormat32bppRGBA ) {std::cout<< "Output format does not match the captured format: "<< "width = " << header.width << ", "<< "height = " << header.height << ", "<< "stride = " << header.stride << ", "<< "bpp = " << captured_bytes_per_pixel << ", "<< "pixel format RGBA ? "<< (header.format == GUID_WICPixelFormat32bppRGBA) << ".";return;}static FILE* fp = fopen(".\\rgba.rgba","wb");if (fp){//fwrite(data, header.width * header.height * 4, 1, fp);fwrite(data, header.cbSize, 1, fp);fflush(fp);fclose(fp);fp = NULL;}// Copy the data into the frame./* current_frame->CopyPixelsFrom(reinterpret_cast<uint8_t*>(data), header.stride,DesktopRect::MakeXYWH(0, 0, header.width, header.height));*/magnifier_capture_succeeded_ = true; }int CExcludeWindow::SetExcludeWnd(HWND hWnd) {if (hWnd) {BOOL result = set_window_filter_list_func_(magnifier_window_, MW_FILTERMODE_EXCLUDE, 1, &hWnd);if (!result) {mag_uninitialize_func_();std::cout<< "Failed to initialize ScreenCapturerWinMagnifier: "<< "error from MagSetWindowFilterList " << GetLastError();return -1;}}return 0; }bool CExcludeWindow::CaptureFrame() {int nX = GetSystemMetrics(SM_XVIRTUALSCREEN);int nY = GetSystemMetrics(SM_YVIRTUALSCREEN);int nScreenW = GetSystemMetrics(SM_CXVIRTUALSCREEN);int nScreenH = GetSystemMetrics(SM_CYVIRTUALSCREEN);BOOL result = SetWindowPos(magnifier_window_, NULL, nX, nY,nScreenW, nScreenH, 0);if (!result) {std::cout << "Failed to call SetWindowPos: " << GetLastError()<< ". Rect = {" << nX<< ", " << nY << ", " << nX + nScreenW << ", "<< nY + nScreenH << "}";return false;}magnifier_capture_succeeded_ = false;RECT native_rect = { nX, nY, nX+nScreenW, nY+ nScreenH };TlsSetValue(GetTlsIndex(), this);// OnCaptured will be called via OnMagImageScalingCallback and fill in the// frame before set_window_source_func_ returns.result = set_window_source_func_(magnifier_window_, native_rect);if (!result) {std::cout << "Failed to call MagSetWindowSource: "<< GetLastError() << ". Rect = {" << nX<< ", " << nY << ", " << nX + nScreenW << ", "<< nY + nScreenH << "}";return false;}return magnifier_capture_succeeded_; }

測試：

CExcludeWindow ex; ex.Init(); ex.SetExcludeWnd(hWnd); ex.CaptureFrame();//回調函數會寫下一個rgba的文件

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