UE4 调用dll

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本文介绍了如何在UE4中通过C++调用外部DLL文件的具体步骤与代码实现。包括了DLL头文件的引入、函数指针的定义、DLL文件路径的组合与获取等关键环节。

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[for UE 4.25.3]

UE4调用dll的方法和标准的c及c++相同，核心代码如下：

//包含dll的头文件
#include "C:/Users/Documents/Unreal Projects/MyProject01/MyPlugins/IGaussDiffusion.h"
#include "C:/Users/Documents/Unreal Projects/MyProject01/MyPlugins/IFactor.h"

//定义dll里的函数指针
typedef void (* destroyGaussDiffusion)(IGaussDiffusion* );
typedef void (*destroyFactors)(IFactor*);


//调用dll的代码段
FString filePath = FPaths::Combine(*FPaths::EnginePluginsDir(), TEXT("FangHua/"), 
		TEXT("GaussDiffusionDLL.dll")); // Concatenate the plugins folder and the DLL file.
	if (FPaths::FileExists(filePath)) {
		void* DLLHandle;
		DLLHandle = FPlatformProcess::GetDllHandle(*filePath); // Retrieve the DLL.
		if (DLLHandle != NULL) {
			//释放高斯
			destroyGaussDiffusion DLLdestroyGaussDiffusion = NULL; // Local DLL function pointer.
			FString procName = "freeGaussDiffusion"; // The exact name of the DLL function.
			DLLdestroyGaussDiffusion = (destroyGaussDiffusion)FPlatformProcess::GetDllExport(DLLHandle, *procName); // Export the DLL function.
			if (DLLdestroyGaussDiffusion != NULL) {
				DLLdestroyGaussDiffusion(gaussDiffusion);// Call the DLL function, with arguments corresponding to the signature and return type of the function.
			}
			//释放米氏理论
			destroyFactors DLLdestroyFactors = NULL; // Local DLL function pointer.
			FString procName1 = "freeFactors"; // The exact name of the DLL function.
			DLLdestroyFactors = (destroyFactors)FPlatformProcess::GetDllExport(DLLHandle, *procName1); // Export the DLL function.
			if (DLLdestroyFactors != NULL) {
				DLLdestroyFactors(factor);// Call the DLL function, with arguments corresponding to the signature and return type of the function.
			}
		}
	}