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UE4 开发如何使用 Http 请求_wx61ae2f5191643的技术博客_51CTO博客
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UE4 开发如何使用 Http 请求_wx61ae2f5191643的技术博客_51CTO博客
虚幻引擎:UEC如何对JSON文件进行读写?-CSDN博客
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VaRest 在代码插件创建的VaRest - 虚幻引擎商城
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UE4使用VaRest插件请求httpAPI以及解析json格式数据_ue4 varest-CSDN博客 示例代码
里面有部分是我测试Http下载文件的代码.所以实际效果很乱.自行理解删减
单纯的Http请求.返回值因为与下面这个下载是同一个Class里面所以是混乱的Http下载文件 UE Http下载文件/解压压缩包_Vince丶的博客-CSDN博客 xxx..Build.csHTTP,
Json,
JsonUtilities
.h#pragma once#include CoreMinimal.h
#include Kismet/BlueprintAsyncActionBase.h
#include Interfaces/IHttpRequest.h
#include AsyncHttpObject.generated.h#pragma region OneDECLARE_DYNAMIC_MULTICAST_DELEGATE_ThreeParams(FDownloadProgressDelegate,const int32, ReceivedDataInBytes,const int32, TotalDataInBytes,const TArrayuint8, BinaryData
);
DECLARE_DYNAMIC_MULTICAST_DELEGATE(FDownloadDelegate);#pragma endregion#pragma region TwoUENUM(BlueprintType)
enum class EPTRequestVerb : uint8
{GET,POST
};#pragma endregion
/****/
UCLASS()
class PIECETOGETHERTOOLS_API UAsyncHttpObject : public UBlueprintAsyncActionBase
{GENERATED_BODY()public:#pragma region OneUFUNCTION(BlueprintCallable, Category Vince | AsyncHttp, meta (BlueprintInternalUseOnly true))static UAsyncHttpObject* AsyncHttpDownload(const FString URL, FString fileSavePath, FString ileSaveName);void DownloadRequestStart(const FString url);void DownloadRequestHandle(FHttpRequestPtr request, FHttpResponsePtr response, bool bWasSuccessful);void DownloadProgress(FHttpRequestPtr request, int32 bytesSent, int32 bytesReceived);//输出节点UPROPERTY(BlueprintAssignable, Category Vince | AsyncHttp)FDownloadProgressDelegate OnProgressUpdate; //最好把有参数的放在前面不然参数在蓝图节点有时候被吃掉了//输出节点UPROPERTY(BlueprintAssignable, Category Vince | AsyncHttp)FDownloadDelegate OnSucc;//输出节点UPROPERTY(BlueprintAssignable, Category Vince | AsyncHttp)FDownloadDelegate OnFailed;#pragma endregion#pragma region TwoUFUNCTION(BlueprintCallable, Category Vince | AsyncHttp, meta (BlueprintInternalUseOnly true))static UAsyncHttpObject* ConnectAsyncHttp(EPTRequestVerb verb, const FString URL);FString MassageBody TEXT();void AsyncRequestHandle(FHttpRequestPtr request, FHttpResponsePtr response, bool bWasSuccessful);#pragma endregion
.cpp// Fill out your copyright notice in the Description page of Project Settings.#include AsyncHttpObject.h
#include HttpModule.h
#include Interfaces/IHttpResponse.h
#include Misc/Paths.h
#include HAL/PlatformFileManager.h
#include GenericPlatform/GenericPlatformFile.h#pragma region One//存储目录
FString FileSavePath TEXT();//存储名字
FString FileSaveName TEXT();UAsyncHttpObject* UAsyncHttpObject::AsyncHttpDownload(const FString URL, FString fileSavePath, FString fileSaveName)
{UAsyncHttpObject* AsyncHttpObject NewObjectUAsyncHttpObject();AsyncHttpObject-DownloadRequestStart(URL);FileSavePath fileSavePath;FileSaveName fileSaveName;return AsyncHttpObject;
}//开始请求下载
void UAsyncHttpObject::DownloadRequestStart(const FString url)
{TSharedRefIHttpRequest, ESPMode::ThreadSafe request FHttpModule::Get().CreateRequest();request-SetVerb(GET);request-SetURL(url);request-OnProcessRequestComplete().BindUObject(this, UAsyncHttpObject::DownloadRequestHandle); //请求回调request-OnRequestProgress().BindUObject(this, UAsyncHttpObject::DownloadProgress);// 下载进度request-ProcessRequest();RemoveFromRoot(); // 手动GC
}请求回调
void UAsyncHttpObject::DownloadRequestHandle(FHttpRequestPtr request, FHttpResponsePtr response, bool bWasSuccessful)
{RemoveFromRoot();if (bWasSuccessful response.IsValid() EHttpResponseCodes::IsOk(response-GetResponseCode())){if (response-GetContentLength() 0) {TArrayuint8 EmptyData;OnProgressUpdate.Broadcast(response-GetContentLength(), response-GetContentLength(), EmptyData);}//FString FileSavePath FPaths::ProjectDir() /download/gameplay.png;//下载返回类型设置FString sType, SLeft, SRight;sType response-GetHeader(TEXT(Content-Type));sType.Split(/,SLeft,SRight);FileSaveName.Append(FString::Printf(TEXT(.%s), *SRight)) ;//组合 存储地址FileSavePath FPaths::Combine(FileSavePath, FileSaveName);FString Path, Filename, Extension;FPaths::Split(FileSavePath, Path, Filename, Extension);IPlatformFile PlatformFile FPlatformFileManager::Get().GetPlatformFile();if (!PlatformFile.DirectoryExists(*Path)){if (!PlatformFile.CreateDirectoryTree(*Path)){UE_LOG(LogTemp, Error, TEXT(Create Directory Failed!));OnFailed.Broadcast();return;}}IFileHandle* FileHandle PlatformFile.OpenWrite(*FileSavePath);if (FileHandle){FileHandle-Write(response-GetContent().GetData(), response-GetContentLength());delete FileHandle;OnSucc.Broadcast();return;}else {UE_LOG(LogTemp, Error, TEXT(Save File Failed!));OnFailed.Broadcast();return;}}UE_LOG(LogTemp, Error, TEXT(download File Failed!));OnFailed.Broadcast();return;
}// 下载进度
void UAsyncHttpObject::DownloadProgress(FHttpRequestPtr request, int32 bytesSent, int32 bytesReceived)
{if (request-GetResponse()-GetContentLength() 0){TArrayuint8 EmptyData;OnProgressUpdate.Broadcast(bytesReceived, request-GetResponse()-GetContentLength(), EmptyData);}
}UAsyncHttpObject* UAsyncHttpObject::ConnectAsyncHttp(EPTRequestVerb verb, const FString URL)
{UAsyncHttpObject* AsyncHttpObject NewObjectUAsyncHttpObject();AsyncHttpObject-MassageBody ;if (URL.IsEmpty()){// AsyncHttpObject-OnFailed.Broadcast(URL Is Null);}TSharedRefIHttpRequest, ESPMode::ThreadSafe request FHttpModule::Get().CreateRequest();switch (verb){case EPTRequestVerb::GET://设置请求方式request-SetVerb(TEXT(GET));//设置头request-SetHeader(TEXT(Content-Type), TEXT(application/json;charsetutf-8));break;case EPTRequestVerb::POST:request-SetVerb(TEXT(POST));request-SetHeader(TEXT(Content-Type), TEXT(application/x - www-form-urlencoded));break;default:break;}//设置URLrequest-SetURL(URL);//绑定回调request-OnProcessRequestComplete().BindUObject(AsyncHttpObject, UAsyncHttpObject::AsyncRequestHandle); //请求回调request-OnRequestProgress().BindUObject(AsyncHttpObject, UAsyncHttpObject::DownloadProgress);// 下载进度内容TSharedRefFJsonObject pJsonObject MakeSharedFJsonObject();TSharedRefFJsonObject pJsonObject1 MakeSharedFJsonObject();////pJsonObject-SetStringField(TD, URL);//pJsonObject-SetStringField(TD1, 123);//pJsonObject1-SetObjectField(TDB,pJsonObject);//FString OutputString;//TSharedRefTJsonWriter Writer TJsonWriterFactory::Create(OutputString);//FJsonSerializer::Serialize(pJsonObject1, Writer);Json内容设置//request-SetContentAsString(OutputString);//GEngine-AddOnScreenDebugMessage(-1, 10.0f, FColor::Yellow, OutputString, false);//请求request-ProcessRequest();AsyncHttpObject-RemoveFromRoot(); // 手动GCreturn AsyncHttpObject;}void UAsyncHttpObject::AsyncRequestHandle(FHttpRequestPtr request, FHttpResponsePtr response, bool bWasSuccessful)
{RemoveFromRoot(); // 手动GCif (bWasSuccessful response.IsValid() EHttpResponseCodes::IsOk(response-GetResponseCode())){// 获得返回的json数据TSharedRefTJsonReaderTCHAR JsonReader TJsonReaderFactoryTCHAR::Create(response-GetContentAsString());// 把FString转成TCHARTCHAR* serializedChar response-GetContentAsString().GetCharArray().GetData();// 解决中文乱码问题服务端也是utf-8TCHAR_TO_UTF8(serializedChar);FString myData(serializedChar);// 创建Json对象TSharedPtrFJsonObject JsonObject;// 反序列化jsonbool bIsOk FJsonSerializer::Deserialize(JsonReader, JsonObject);// 判断是否反序列化成功if (bIsOk){FString data JsonObject-GetStringField(city);//FWHelper::Debug(data);UE_LOG(LogTemp, Warning, TEXT(%s), *data);UE_LOG(LogTemp, Warning, TEXT(%s), *myData);FString OutputString;TSharedRefTJsonWriterTCHAR, TPrettyJsonPrintPolicyTCHAR Writer TJsonWriterFactoryTCHAR, TPrettyJsonPrintPolicyTCHAR::Create(OutputString);FJsonSerializer::Serialize(JsonObject.ToSharedRef(), Writer); //Serialize把内存中的对象转为便于存储和传输的数据//打印UE_LOG(LogNet, Warning, TEXT(output 1:\n%s), *OutputString);TSharedPtrFJsonObject, ESPMode::ThreadSafe Object JsonObject-GetObjectField(TEXT(name));TSharedPtrFJsonObject, ESPMode::ThreadSafe ObjectField Object-GetObjectField(TEXT(realtime));FString StringField ObjectField-GetStringField(text);}}
}#pragma endregion//void UAsyncHttpObject::XieJson(FString outjsonStr, const UObject* WorldContextObject)
//{
// // 声明一个存储Json内容的字符串
// FString JsonStr;
// //GetJSONStr(JsonStr,WorldContextObject);
//
// // 创建一个Json编写器
// TSharedRefTJsonWriterTCHAR, TCondensedJsonPrintPolicyTCHAR JsonWriter TJsonWriterFactoryTCHAR, TCondensedJsonPrintPolicyTCHAR::Create(JsonStr);
// //TSharedRefTJsonWriter JsonWriter TJsonWriterFactory::Create(JsonStr);
//
// // 声明Json对象写入开始
// JsonWriter-WriteObjectStart();
// JsonWriter-WriteValue(TEXT(Time), TEXT(21));
//
// // 声明Json数组写入开始
// JsonWriter-WriteArrayStart(TEXT(Data));
// for (int i 0; i 2; i)
// {
// JsonWriter-WriteObjectStart();
// JsonWriter-WriteValue(TEXT(key), i);
// JsonWriter-WriteObjectEnd();
// }
// JsonWriter-WriteArrayEnd();
//
// JsonWriter-WriteObjectEnd();
// // 停止写入
// JsonWriter-Close();
//
// UE_LOG(LogTemp, Warning, TEXT(%s), *JsonStr);
// outjsonStr JsonStr;
//
// GEngine-AddOnScreenDebugMessage(-1, 10.0f, FColor::Yellow, outjsonStr, false);
//}
写入Http请求内容示例
写入Http请求Json内容我自己测试的可以有2种习惯.看自己习惯.c能力有限.可能描述有误.自行理解把.
第一种直接给 FJsonObject 直接写入 .最后在转成Fstring内容
TSharedRefFJsonObject pJsonObject MakeSharedFJsonObject();
TSharedRefFJsonObject pJsonObject1 MakeSharedFJsonObject();pJsonObject-SetStringField(TD, URL);
pJsonObject-SetStringField(TD1, 123);//pJsonObject1-SetObjectField(TDB,pJsonObject);
FString OutputString;
TSharedRefTJsonWriter Writer TJsonWriterFactory::Create(OutputString);
FJsonSerializer::Serialize(pJsonObject1, Writer);//Json内容设置
request-SetContentAsString(OutputString);GEngine-AddOnScreenDebugMessage(-1, 10.0f, FColor::Yellow, OutputString, false); 第二种 创建一个Json编写器 直接编写Json..hUFUNCTION(BlueprintCallable, Category Vince | AsyncHttp, meta (WorldContext WorldContextObject))
static void XieJson(FString outjsonStr, const UObject* WorldContextObject);.cppvoid UPieceTogetherToolsBPLibrary::XieJson(FString outjsonStr, const UObject* WorldContextObject)
{// 声明一个存储Json内容的字符串FString JsonStr;//GetJSONStr(JsonStr,WorldContextObject);// 创建一个Json编写器TSharedRefTJsonWriterTCHAR, TCondensedJsonPrintPolicyTCHAR JsonWriter TJsonWriterFactoryTCHAR, TCondensedJsonPrintPolicyTCHAR::Create(JsonStr);//TSharedRefTJsonWriter JsonWriter TJsonWriterFactory::Create(JsonStr);// 声明Json对象写入开始JsonWriter-WriteObjectStart();JsonWriter-WriteValue(TEXT(Time), TEXT(21));// 声明Json数组写入开始JsonWriter-WriteArrayStart(TEXT(Data));for (int i 0; i 2; i){JsonWriter-WriteValue(TEXT(key), i);}JsonWriter-WriteArrayEnd();JsonWriter-WriteObjectEnd();// 停止写入JsonWriter-Close();UE_LOG(LogTemp, Warning, TEXT(%s), *JsonStr);outjsonStr JsonStr;GEngine-AddOnScreenDebugMessage(-1, 10.0f, FColor::Yellow, outjsonStr, false);
}
Http接收回调解析数据示例 .cpp// 获得返回的json数据TSharedRefTJsonReaderTCHAR JsonReader TJsonReaderFactoryTCHAR::Create(response-GetContentAsString());// 把FString转成TCHARTCHAR* serializedChar response-GetContentAsString().GetCharArray().GetData();// 解决中文乱码问题服务端也是utf-8TCHAR_TO_UTF8(serializedChar);FString myData(serializedChar);// 创建Json对象TSharedPtrFJsonObject JsonObject;// 反序列化jsonbool bIsOk FJsonSerializer::Deserialize(JsonReader, JsonObject);// 判断是否反序列化成功if (bIsOk){FString data JsonObject-GetStringField(city);//FWHelper::Debug(data);UE_LOG(LogTemp, Warning, TEXT(%s), *data);UE_LOG(LogTemp, Warning, TEXT(%s), *myData);FString OutputString;TSharedRefTJsonWriterTCHAR, TPrettyJsonPrintPolicyTCHAR Writer TJsonWriterFactoryTCHAR, TPrettyJsonPrintPolicyTCHAR::Create(OutputString);FJsonSerializer::Serialize(JsonObject.ToSharedRef(), Writer); //Serialize把内存中的对象转为便于存储和传输的数据//打印UE_LOG(LogNet, Warning, TEXT(output 1:\n%s), *OutputString);TSharedPtrFJsonObject, ESPMode::ThreadSafe Object JsonObject-GetObjectField(TEXT(name));TSharedPtrFJsonObject, ESPMode::ThreadSafe ObjectField Object-GetObjectField(TEXT(realtime));FString StringField ObjectField-GetStringField(text);}
