UE5 运行时捕捉外部窗口并嵌入到主窗口

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 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 properties
	AMyActor();

protected:
	// Called when the game starts or when spawned
	virtual void BeginPlay() override;

public:	
	// Called every frame
	virtual 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(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);
}