UE5 C++ 第三方动态库的使用

一. 首先要拷贝对应的 第三方库

bin里有dll动态库，include里有动态库需要的头文件。

二.在Target.cs里，进行设置

头文件前面的路径为公共路径

设置需要一起打包的三方库文件

三.加载这个库

FPlatformProcess::GetDllHandle将他解析为 任意类型，用void* 接受。

	//加载dllFString tmpDllPath = FPaths::GameSourceDir() + TEXT("LearnProject/BassSDK/bin/x64/bass.dll"); //解析这个库BassDllHandle = FPlatformProcess::GetDllHandle(*tmpDllPath);if (!BassDllHandle) return;

再用FPlatformProcess::GetDllExport.传入这个解析出来库的指针，和你要使用的函数名的TEXT类型，比如TEXT("BASS_Init")。返回也要进行指针转换，转换为对应的函数指针。没想到函数指针在这里居然被用到。

	//初始化bassBassInitTOFunc BassInitTO = (BassInitTOFunc)FPlatformProcess::GetDllExport(BassDllHandle, TEXT("BASS_Init")); //拿到这个库的某个函数（初始化）if (!BassInitTO) return;bool isBassInit = BassInitTO(-1, 44100, 0, NULL, 0);if (!isBassInit) return;

我们用函数指针BassInitTOFunc接住返回值。它的定义如下

typedef BOOL(*BassInitTOFunc)(int, DWORD, DWORD, HWND, const void*);

这里是给 函数指针起了 叫BassInitToFunc的别名。可以看这篇文章的第三部分

C语言指针进阶（一）——深入详解“函数指针”与“指针函数”-CSDN博客

四.来回用库里的函数达到播放音乐效果

#pragma once#include "CoreMinimal.h"
#include "UObject/NoExportTypes.h"
#include "bass.h"
#include "DLLManager.generated.h"/*** *///音效
#define AUDIO_BASS_BGM				"DiscoFlow.wav"
typedef BOOL(*BassInitTOFunc)(int, DWORD, DWORD, HWND, const void*);
typedef HSTREAM(*BassCreateTOFunc)(BOOL, const void*, QWORD, QWORD, DWORD);
typedef BOOL(*BassPlayTOFunc)(DWORD, BOOL);UCLASS()
class LEARNPROJECT_API UDLLManager : public UObject
{GENERATED_BODY()
public:void InitDLL();//BGMbool PlayBGMTO();void* BassDllHandle;//Bass dllHSTREAM BassBGM;
};

// Fill out your copyright notice in the Description page of Project Settings.#include "DLLManager.h"void UDLLManager::InitDLL()
{//加载dllFString tmpDllPath = FPaths::GameSourceDir() + TEXT("LearnProject/BassSDK/bin/x64/bass.dll"); //解析这个库BassDllHandle = FPlatformProcess::GetDllHandle(*tmpDllPath);if (!BassDllHandle) return;//初始化bassBassInitTOFunc BassInitTO = (BassInitTOFunc)FPlatformProcess::GetDllExport(BassDllHandle, TEXT("BASS_Init")); //拿到这个库的某个函数（初始化）if (!BassInitTO) return;bool isBassInit = BassInitTO(-1, 44100, 0, NULL, 0);if (!isBassInit) return;//创建bgm文件流BassCreateTOFunc BassCreateTO = (BassCreateTOFunc)FPlatformProcess::GetDllExport(BassDllHandle, TEXT("BASS_StreamCreateFile")); //拿到这个库的某个函数（加载流文件）if (BassCreateTO){FString AudioFile = FPaths::GameSourceDir() + TEXT("LearnProject/BassSDK/Audios/") + AUDIO_BASS_BGM;BassBGM = BassCreateTO(FALSE, TCHAR_TO_UTF8(*AudioFile), 0, 0, BASS_SAMPLE_LOOP);}
}bool UDLLManager::PlayBGMTO()
{if (!BassDllHandle) return false;BassPlayTOFunc BassPlayTO = (BassPlayTOFunc)FPlatformProcess::GetDllExport(BassDllHandle, TEXT("BASS_ChannelPlay"));  //拿到这个库的某个函数（单通道播放）if (BassPlayTO)return BassPlayTO(BassBGM, true);return false;
}

测试

// 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"class UDLLManager;UCLASS()
class LEARNPROJECT_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;//音效管理UPROPERTY()UDLLManager* AudioManager;};

// Fill out your copyright notice in the Description page of Project Settings.#include "MyActor.h"
#include "DLLManager.h"// 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();AudioManager = NewObject<UDLLManager>(this);if (AudioManager){AudioManager->InitDLL();// AudioManager->InitAudioManager();AudioManager->PlayBGMTO();}
}// Called every frame
void AMyActor::Tick(float DeltaTime)
{Super::Tick(DeltaTime);}