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UE5 运行时捕捉外部窗口并嵌入到主窗口的一种方法

创建一个Slate类用于生成一个窗口

.h// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "Widgets/SCompoundWidget.h"/*** */
class NEWWINDOWTEST0822_API SCreateNewWindow : public SCompoundWidget
{
public:SLATE_BEGIN_ARGS(SCreateNewWindow){}SLATE_END_ARGS()/** Constructs this widget with InArgs */void Construct(const FArguments& InArgs);static void CreateAAA();
};

.cpp// Fill out your copyright notice in the Description page of Project Settings.#include "SCreateNewWindow.h"
#include "SlateOptMacros.h"BEGIN_SLATE_FUNCTION_BUILD_OPTIMIZATION
void SCreateNewWindow::Construct(const FArguments& InArgs)
{/*ChildSlot[// Populate the widget];*/
}void SCreateNewWindow::CreateAAA()
{TSharedPtr<SWindow> NewWin = SNew(SWindow).ClientSize(FVector2D(800,600)).Title(FText::FromString(TEXT("AAAAA")));FSlateApplication::Get().AddWindow(NewWin.ToSharedRef());
}END_SLATE_FUNCTION_BUILD_OPTIMIZATION

创建一个Actor类，用于调用Slate类中的方法

.h// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "GameFramework/Actor.h"
#include "MyActor.generated.h"UCLASS()
class NEWWINDOWTEST0822_API AMyActor : public AActor
{GENERATED_BODY()public:	// Sets default values for this actor's propertiesAMyActor();protected:// Called when the game starts or when spawnedvirtual void BeginPlay() override;public:	// Called every framevirtual void Tick(float DeltaTime) override;UFUNCTION(BlueprintCallable,Category = "Function")static void SpawnWindow();UFUNCTION(BlueprintCallable,Category = "Function")static void findAAA(FString AAAname);static void OnMainWindowClosed();};

.cpp// Fill out your copyright notice in the Description page of Project Settings.#include "MyActor.h"
#include "Windows/AllowWindowsPlatformTypes.h"
#include "SCreateNewWindow.h"FDelegateHandle MainWindowClosedHandle; // 用于存储主窗口关闭事件的句柄
HWND OtherWindowHandle = nullptr; // 嵌入的子窗口句柄
// Sets default values
AMyActor::AMyActor()
{// Set this actor to call Tick() every frame.  You can turn this off to improve performance if you don't need it.PrimaryActorTick.bCanEverTick = true;}// Called when the game starts or when spawned
void AMyActor::BeginPlay()
{Super::BeginPlay();}// Called every frame
void AMyActor::Tick(float DeltaTime)
{Super::Tick(DeltaTime);}void AMyActor::SpawnWindow()
{SCreateNewWindow::CreateAAA();
}void AMyActor::findAAA(FString AAAname)
{void* winhandle = GEngine->GameViewport->GetWindow()->GetNativeWindow()->GetOSWindowHandle();//static_cast 一个类型转换运算符，用于进行静态类型转换。它可以用来将一个数据类型转换为另一个数据类型HWND MainWindowHwnd = static_cast<HWND>(winhandle);if (MainWindowHwnd){const WCHAR* WindowName = *AAAname;HWND otherWindow = FindWindowW(NULL, WindowName);SetWindowPos(otherWindow, NULL, 0, 0, 0, 0, SWP_NOSIZE | SWP_NOZORDER);LONG style = GetWindowLong(otherWindow, GWL_STYLE);SetWindowLong(otherWindow, GWL_STYLE, style | WS_OVERLAPPEDWINDOW);SetParent(otherWindow,MainWindowHwnd);OtherWindowHandle = otherWindow;// 存储嵌入的子窗口句柄OtherWindowHandle = otherWindow;// 注册主窗口关闭事件//MainWindowClosedHandle = FCoreDelegates::OnPreExit.AddUObject(this, &AMyActor::OnMainWindowClosed);MainWindowClosedHandle = FCoreDelegates::OnPreExit.AddStatic(&AMyActor::OnMainWindowClosed);}}void AMyActor::OnMainWindowClosed()
{if (OtherWindowHandle){DestroyWindow(OtherWindowHandle);}// 取消主窗口关闭事件的注册FCoreDelegates::OnPreExit.Remove(MainWindowClosedHandle);
}