UE4 C++ 讀寫遊戲數據,限制使用次數,限制使用時間,按鍵輸入檢測,刪除文件

新建空場景

設置爲默認的GameMode

新建三個C++類

1. 繼承:SaveGame
   命名:SaveGame_Main

2. 繼承:UserWidget
   命名:UserWidget_OpenCount
   新建藍圖Widget,繼承UserWidget,添加"Text"組件

3. 繼承:Actor
   命名:Actor_GameController
   拖進兩個場景中,設置參數

SaveGame_Main.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/SaveGame.h"
#include "SaveGame_Main.generated.h"

/**
 *
 */
UCLASS()
class MAP_CLIENT_API USaveGame_Main : public USaveGame
{
	GENERATED_BODY()

public:
	UPROPERTY()  //  必須加UPROPERTY()
		int OpenCount;
};

UserWidget_OpenCount.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "Blueprint/UserWidget.h"
#include "TextBlock.h"
#include "UserWidget_OpenCount.generated.h"

/**
 * 
 */
UCLASS()
class MAP_SERVER_API UUserWidget_OpenCount : public UUserWidget
{
	GENERATED_BODY()
	
public:
	UPROPERTY(Meta = (BindWidget))
		UTextBlock* Text_OpenCount;

};

Actor_GameController.h

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/Actor.h"

#include "Actor_GameController.generated.h"


class UUserWidget_OpenCount;
class USaveGame_Main;

UCLASS()
class MAP_CLIENT_API AActor_GameController : public AActor
{
	GENERATED_BODY()

private:
	UPROPERTY(EditAnywhere, Category = "Actor_GameController")
		FName EmptyLevelName = TEXT("EmptyMap");

	UPROPERTY(EditAnywhere, Category = "Actor_GameController|Count(Exclusive)")
		int MaxOpenCount = 20;

	UPROPERTY(EditAnywhere, Category = "Actor_GameController|Time (Exclusive)")
		int32 MaxYear = 2020;
	UPROPERTY(EditAnywhere, Category = "Actor_GameController|Time (Exclusive)")
		int8 MaxMonth = 5;
	UPROPERTY(EditAnywhere, Category = "Actor_GameController|Time (Exclusive)")
		int8 MaxDay = 9;

	UUserWidget_OpenCount* WB_OpenCount;
	USaveGame_Main* SaveGame_Main;

public:
	AActor_GameController();

protected:
	virtual void BeginPlay() override;
	virtual void Tick(float DeltaSeconds) override;

};

Actor_GameController.cpp

// Fill out your copyright notice in the Description page of Project Settings.

#include "Actor_GameController.h"
#include "Kismet/GameplayStatics.h"
#include "SaveGame_Main.h"
#include "Helper.h"
#include "UserWidget_OpenCount.h"

#include "Paths.h"
#include "PlatformFilemanager.h"
#include "GenericPlatform/GenericPlatformFile.h"

#include "AllowWindowsPlatformTypes.h"
#include <shellapi.h>
#include "HideWindowsPlatformTypes.h"


AActor_GameController::AActor_GameController()
{
	PrimaryActorTick.bCanEverTick = true;

	AutoReceiveInput = EAutoReceiveInput::Player0;
}

void AActor_GameController::BeginPlay()
{
	Super::BeginPlay();

	//	如果當前關卡是空關卡,刪除視頻文件
	if (UGameplayStatics::GetCurrentLevelName(GetWorld()).Equals(EmptyLevelName.ToString()))
	{
		//	遊戲地址
		FString GamePath = FPaths::ConvertRelativePathToFull(FPaths::ProjectDir());

		//	Source地址
		FString SourcePath = GamePath + "Source";

		//	判斷是否是打包後的程序
		if (!FPlatformFileManager::Get().GetPlatformFile().DirectoryExists(*SourcePath))
		{
			Print() + "Delete File";
			//	刪除視頻文件
			FString MoviesPath = GamePath + "Content/Movies";
			FPaths::MakePlatformFilename(MoviesPath);
			FString CmdStr = "/c rd /s/q " + MoviesPath;
			ShellExecute(NULL, NULL, _T("cmd"), *CmdStr, NULL, SW_HIDE);

			//	退出遊戲
			UKismetSystemLibrary::QuitGame(GetWorld(), nullptr, EQuitPreference::Quit, true);
		}
		else
		{
			Print() + "In Editor, Don't Delete File";
		}
		return;
	}


	if (!WB_OpenCount)
	{
		WB_OpenCount = CreateWidget<UUserWidget_OpenCount>(GetGameInstance(), LoadClass<UUserWidget_OpenCount>(this, TEXT("WidgetBlueprint'/Game/Blueprint/WB_OpenCount.WB_OpenCount_C'")));
	}

	//	加載/保存 運行次數
	if (UGameplayStatics::DoesSaveGameExist(TEXT("GameController"), 0))
	{
		//	加載數據
		SaveGame_Main = Cast<USaveGame_Main>(UGameplayStatics::LoadGameFromSlot(TEXT("GameController"), 0));
		//	修改數據
		SaveGame_Main->OpenCount = SaveGame_Main->OpenCount++;
		//	保存數據
		UGameplayStatics::SaveGameToSlot(SaveGame_Main, TEXT("GameController"), 0);
	}
	else
	{
		//	創建文件
		SaveGame_Main = Cast<USaveGame_Main>(UGameplayStatics::CreateSaveGameObject(USaveGame_Main::StaticClass()));
		//	修改數據
		SaveGame_Main->OpenCount = SaveGame_Main->OpenCount++;
		//	保存數據
		UGameplayStatics::SaveGameToSlot(SaveGame_Main, TEXT("GameController"), 0);
	}



	//	到達次數
	if (SaveGame_Main->OpenCount >= MaxOpenCount)
	{
		//	切換空關卡
		UGameplayStatics::OpenLevel(GetWorld(), EmptyLevelName);
		Print() + "OpenCount is Max, OpenCount: " + SaveGame_Main->OpenCount;
	}

	//	到達時間
	float ExpireHours = (FDateTime(MaxYear, MaxMonth, MaxDay) - FDateTime::Now()).GetTotalHours();
	if (ExpireHours < 0)
	{
		//	切換空關卡
		UGameplayStatics::OpenLevel(GetWorld(), EmptyLevelName);
		Print() + "UseTime is Max, ExpireHours: " + (int)(ExpireHours * -1);
	}
}

void AActor_GameController::Tick(float DeltaSeconds)
{
	Super::Tick(DeltaSeconds);

	if (GetWorld()->GetFirstPlayerController()->WasInputKeyJustPressed(FKey(TEXT("J"))))
	{
		if (WB_OpenCount)
		{
			if (WB_OpenCount->IsInViewport())
			{
				WB_OpenCount->RemoveFromParent();
			}
			else
			{
				WB_OpenCount->AddToViewport();
				WB_OpenCount->Text_OpenCount->SetText(FText::FromString(FString::FromInt(SaveGame_Main->OpenCount)));
			}
		}
	}
}