UE4使用OpenCV插件调用电脑摄像头

使用的是UE4.27，参考两位大佬博客

https://blog.csdn.net/d137578736/article/details/79037849?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-1-79037849-blog-126785890.pc_relevant_vip_default&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7ERate-1-79037849-blog-126785890.pc_relevant_vip_default&utm_relevant_index=2

https://blog.csdn.net/Accepted_10086/article/details/126785890

讲的很详细，但是遇到了一些问题。

1 创建UE4.27工程

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选择创建C++类。

2 下载OpenCV插件。

插件参考第二个大佬博客。

将下载的三个文件复制到工程文件夹下。
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关闭打开的UE项目和VS，右键uproject文件。选择第三个，生成VS项目文件。

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3 修改OpenCV代码

双击.sln文件，打开项目，在Source->项目名下，找到项目名.build.cs文件。

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在文件开头加

using System.IO;

在类中public前面加

private string ThirdPartyPath
{
    get
    {
		return Path.GetFullPath(Path.Combine(ModuleDirectory, "../../ThirdParty"));
    }
}

在注释后面加

	string OpenCVPath = Path.Combine(ThirdPartyPath, "OpenCV/");
	PublicIncludePaths.AddRange(new string[]
	{
		Path.Combine(OpenCVPath,"Includes")
	});
	PublicLibraryPaths.Add(Path.Combine(OpenCVPath, "Libraries/Win64"));

整体代码如下：

// Copyright Epic Games, Inc. All Rights Reserved.

using UnrealBuildTool;
using System.IO;

public class test_opencv : ModuleRules
{
	private string ThirdPartyPath
    {
        get
        {
			return Path.GetFullPath(Path.Combine(ModuleDirectory, "../../ThirdParty"));
        }
	}
	public test_opencv(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
	
		PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore" });

		PrivateDependencyModuleNames.AddRange(new string[] {  });

		// 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
		string OpenCVPath = Path.Combine(ThirdPartyPath, "OpenCV/");
		PublicIncludePaths.AddRange(new string[]
		{
			Path.Combine(OpenCVPath,"Includes")
		});
		PublicLibraryPaths.Add(Path.Combine(OpenCVPath, "Libraries/Win64"));
	}
}

然后右键项目，生成。编译成功。

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