C++打印函数

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创建一个名为ConsoleLog的新角色。

（修正）#include "Engine/Engine.h"

我们不必在头文件中做任何事情，但是下面是创建新角色时应显示的默认代码。我给演员打电话ConsoleLog，如果您选择其他名称，请确保在必要时进行更改。

ConsoleLog.h#pragma once#include "CoreMinimal.h"#include "GameFramework/Actor.h"#include "ConsoleLog.generated.h"UCLASS()class UNREALCPP_API AConsoleLog : public AActor{        GENERATED_BODY()        public:                // Sets default values for this actor's properties        AConsoleLog();protected:        // Called when the game starts or when spawned        virtual void BeginPlay() override;public:                // Called every frame        virtual void Tick(float DeltaTime) override;        };

.cpp文件是我们将注销消息的位置。对于此示例，我们将注销消息中的BeginPlay消息。因此，当游戏开始时，消息将打印出来。下面是三种记录消息的方法。

登录控制台UE_LOG(LogTemp, Warning, TEXT("I just started running"));
打印到屏幕GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT("Screen Message"));
打印矢量GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Orange, FString::Printf(TEXT("My Location is: %s"), *GetActorLocation().ToString()));

下面是完整的.cpp文件。前两个define调用是使记录消息更容易的快捷方式。

ConsoleLog.cpp// define a print message function to print to screen#define print(text) if (GEngine) GEngine->AddOnScreenDebugMessage(-1, 1.5, FColor::Green,text)#define printFString(text, fstring) if (GEngine) GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Magenta, FString:rintf(TEXT(text), fstring))#include "ConsoleLog.h"// Sets default valuesAConsoleLog::AConsoleLog(){         // 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 spawnedvoid AConsoleLog::BeginPlay(){        Super::BeginPlay();        // Standard way to log to console.        UE_LOG(LogTemp, Warning, TEXT("I just started running"));        // Log to Screen        GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Red, TEXT("Screen Message"));        FVector MyVector = FVector(200,100,900);        // log vector        GEngine->AddOnScreenDebugMessage(-1, 5.f, FColor::Orange, FString::Printf(TEXT("My Location is: %s"), *GetActorLocation().ToString()));        // Use the shortcut defined above        print("Hello Unreal");                printFString("My Variable Vector is: %s", *MyVector.ToString());        }// Called every framevoid AConsoleLog::Tick(float DeltaTime){        Super::Tick(DeltaTime);}

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