UE5_OpenCV库的加载方式

UE5使用opencv库要在系统中添加opencv的环境变量

在项目文件夹下新建ThirdParty，拷贝bin，新建OpenCV文件夹，拷贝include、lib

打开项目，找到source目录下的build.cs文件

修改build.cs内容，添加头文件路径，dll路径，lib路径

// Copyright Epic Games, Inc. All Rights Reserved.
 
using UnrealBuildTool;
using System.IO;
 
 
 
public class newopencv : ModuleRules
{
	private string ModulePath
	{
		get
		{
			return ModuleDirectory;
		}
	}
 
	private string ThirPartyPath
	{
		get
		{
			return Path.GetFullPath(Path.Combine(ModulePath, "../../ThirdParty/"));
		}
	}
 
	public bool loadopencv(ReadOnlyTargetRules Target)
	{
		string OpenCVPath = Path.Combine(ThirPartyPath, "OpenCV");
		string libpath = "";
		if (Target.Platform == UnrealTargetPlatform.Win64)
		{
			PublicIncludePaths.AddRange(new string[]{Path.Combine(OpenCVPath,"include")});
 
			libpath = Path.Combine(OpenCVPath, "lib");
			
			PublicSystemLibraryPaths.Add(libpath);
			
			PublicAdditionalLibraries.Add("opencv_world480.lib");
			
			RuntimeDependencies.Add(Path.Combine("$(BinaryOutputDir)","opencv_world320.dll"),Path.Combine(libpath,"opencv_videoio_ffmpeg480_64.dll"));
			RuntimeDependencies.Add(Path.Combine("$(BinaryOutputDir)","opencv_ffmpeg320_64.dll"),Path.Combine(libpath,"opencv_world480.dll"));
			return true;
		}
		
		return false;
	}
 
	public newopencv(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
	
		PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore","RenderCore","RHI" });
 
		//PrivateDependencyModuleNames.AddRange(new string[] { "OpenVDB" });
		//PublicDependencyModuleNames.Add("UMG");
 
 
		loadopencv(Target);
 
		// Uncomment if you are using Slate UI
		PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
 
		// Uncomment if you are using online features
		// PrivateDependencyModuleNames.Add("OnlineSubsystem");
 
		// To include OnlineSubsystemSteam, add it to the plugins section in your uproject file with the Enabled attribute set to true
	}
	
}

OpenCV库加载完成，以下是opencv读取外部png设置给ui的方法

// Fill out your copyright notice in the Description page of Project Settings.
 
 
#include "userwidgetClass.h"
 
#include 
#include 
#include 
#include 
 
#include "Windows/WindowsTextInputMethodSystem.h"
 
void UuserwidgetClass::NativeConstruct()
{
	Super::NativeConstruct();
 
	openCV_RW_png();
}
 
void UuserwidgetClass::openCV_RW_png()
{
	cv::Mat img;
	img = cv::imread("E:\\mlao.PNG");
 
	// 确保图像是BGR格式
	if (img.channels() == 3)
	{
		cv::cvtColor(img, img, cv::COLOR_BGR2RGBA);
	}
 
	// 确保图像是8位无符号整数类型
	if (img.depth() != CV_8U)
	{
		img.convertTo(img, CV_8U);
	}
 
	UTexture2D* texture = UTexture2D::CreateTransient(img.cols,img.rows,PF_R8G8B8A8);
 
	void* texturedata = texture->PlatformData->Mips[0].BulkData.Lock(LOCK_READ_WRITE);
 
	FMemory::Memcpy(texturedata,img.data,img.total()*img.elemSize());
 
	texture->PlatformData->Mips[0].BulkData.Unlock();
 
	texture->UpdateResource();
	
	FSlateBrush Brush;
	Brush.SetResourceObject(texture);
 
	Image_abc->SetBrush(Brush);
}