一、UE4 Source Header ReferencesCString.h UnrealString.h NameTypes.h StringConv.h (TCHAR_TO_ANSI etc)CString.h可以查到更多如atoi64 (string to int64) Atod (string to double precision float)二、日志打印1.输出字符串到output log中1.1 最普通的三种FString filePath UE_LOG(LogTemp, Log, TEXT(Hello,World!)); UE_LOG(LogTemp, Warning, TEXT(Hello,World!)); UE_LOG(LogTemp, Error, TEXT(Hello,World!));1.2 %d打印int%f打印float%s string前面加throttle是为了知道打印的对象UE_LOG(LogTempLogTEXT(throttle %d), throttle); //输出throttle 1532 FString filePath UE_LOG(LogTemp, Log, TEXT(%s), *filePath);1.3 自定义 分类的名字 的log.h DECLARE LOG CATEGORY EXTERN(MyLog,LogAll); .cpp DEFINE_LOG_CATEGORY(MyLog); ​ UE_LOG(MyLog,Warning,TEXT (Success)); ​ 输出 MyLog:Warning:Success2.输出字符串到屏幕上FString filePath; GEngine-AddOnScreenDebugMessage(-1, 5.f, FColor::Green, FString::Printf(TEXT(DLL_Init))); GEngine-AddOnScreenDebugMessage(-1, 5.f, FColor::Green, FString::Printf(TEXT(%s), *filePath));三、FString3.1 FString To FNames不可靠因为FName不区分大小写所以转换存在丢失//字符串 FString TheString Helloworld; //将FString转换为FName FName ConvertedFString FName(*TheString);3.2 FString To FTextFString TheString Helloworld; FText ConvertedFStingFText::FromSting(TheString);3.3 FString To Array[uint8]//方法1 FString JsonStr; TArrayuint8 content; content.SetNum(JsonStr.Len()); memcpy(content.GetData(), TCHAR_TO_ANSI(*JsonStr), JsonStr.Len()); ​ //方法2 FString StrData; const TCHAR* StrPtr *StrData; FTCHARToUTF8 UTF8String(StrPtr); int32 CTXSize UTF8String.Length(); TArrayuint8 URLData; URLData.SetNum(CTXSize); memcpy(URLData.GetData(), UTF8String.Get(), CTXSize);3.4 FString To char*FString TheString Helloworld; char* MyCharPtr TCHAR_TO_UTF8(*MyFString);3.5 FString To const char *const char *plainText TCHAR_TO_ANSI(*aes_content);3.6 FString To TCHAR*FString sa; TCHAR* t*s;3.7 FString To std::string#include string ​ FString UE4Str TEXT(Flowers); std::string MyStdString TCHAR_TO_UTF8(*UE4Str);3.8 FString To JsonObject处理Json需要在.Build.cs中添加Json模块PrivateDependencyModuleNames.AddRange( new string[] { CoreUObject, Engine, Slate, SlateCore, Json, // ... add private dependencies that you statically link with here ... } );//注意String中使用双引号 FString JsonStr TEXT({\key\:\value\,\key2\:\value2\}); TSharedPtrFJsonObject JsonObject MakeShareable(new FJsonObject); TSharedRefTJsonReader Reader TJsonReaderFactory::Create(JsonStr); FJsonSerializer::Deserialize(Reader,JsonObject); //JsonObject就是Json3.9 FString To boolFString TheString 123.021; bool MyBool MyFString.ToBool();3.10FString To int32FString TheString 123.021; //注意Atoi和Atof是静态函数所以使用语法FCStringTheFunction调用它) int32 MyShinyNewInt FCString::Atoi(*TheString);3.11 FString To int64FString TheString 12312345678789561234879; //注意Atoi64是静态函数所以使用语法FCString::TheFunction调用它) int64 MyShinyNewInt FCString::Atoi64(*TheString);3.12 FString To floatFString TheString 123.021; //注意Atoi和Atof是静态函数所以使用语法FCStringTheFunction调用它) float MyShinyNewFloat FCString::Atof(*TheString);3.13 FString To double//函数方式 bool UDoubleFunction::FStringToDouble(FString str,double num) { std::string numString TCHAR_TO_UTF8(*str); double b atof(numString.c_str()); if (b NULL) { return false; } num b; return true; } ​ //直接转换 FString TheString 123.021; //注意Atod是静态函数所以使用语法FCStringTheFunction调用它) double MyShinyNewFloat FCString::Atod(*TheString); ​ //FString转String转Double FString str 113.5246854; std::string numString TCHAR_TO_UTF8(*str); double b atof(numString.c_str());3.14 转换 To FString//int FString NewString FString::FromInt(MyInt); //float //double ----只能精确到小数点后6位 FString VeryCleanString FString::SanitizeFloat(MyFloat); //bool FString MyFString MyBool?TEXT(true) :TEXT(false); //FVector FString MyFString MyVector.ToString(); //FVector2D FString MyFString MyVector2D.ToString(); //FRotator FString MyFString MyRotator.ToString(); //FLinearColor FString MyFString MyLinearColor.ToString(); //UObject FString MyFString (MyObj ! NULL) ? MyObj-GetName() : FString(TEXT(None)); //FMatrix FMatrix rotationMatrix(FPlane(0,1,2,3),FPlane(4,5,6,7),FPlane(8,9,10,11),FPlane(12,13,14,15)); FString str rotationMatrix.ToString();3.15 double To FString//直接转换精确到小数点后6位 return FString::SanitizeFloat(numeral.dou); //double→string→FString精确到小数点后6位 std::string Str std::to_string(numeral.dou); FString string UTF8_TO_TCHAR(Str.c_str()); //输出有效位数15位 #include iostream #include string #include sstream #include iomanip string str; double d numeral.dou; stringstream ss; ss setprecision(15) d; str ss.str(); FString string UTF8_TO_TCHAR(str.c_str()); //指定小数点后几位 --注double的有效位数只有16位小数点算一位 double doub 9999.1234567891011121314; FString TimeDesc FString::Printf(TEXT(%.15f), doub); //9999.1234567891006013.16 bytes To FStringFString fstr; for (int i(0); i FaceArray.Num() * 4; i) { FString tmpStr; ByteToHex(f_arrbytes[i], tmpStr); fstr.Append(tmpStr); } UE_LOG(LogTemp, Log, TEXT(%S), *fstr);3.17 FArrayReaderPtr to FStringuint8 data[512]; FMemory::Memzero(data, 512); FMemory::Memcpy(data, ArrayReaderPtr-GetData(), ArrayReaderPtr-Num()); FString str ((const char*)data);3.18 Array[uint8] to FStringTArrayuint8 content; const std::string cstr(reinterpret_castconst char*(content.GetData()), content.Num()); FString frameAsFString cstr.c_str(); UE_LOG(VRSLog, Warning, TEXT(%s), *frameAsFString);3.19FString To MD5FStringFString str TEXT(someStuff); FString md5 FMD5::HashAnsiString();3.20 FString To Ascii/UnicodeFString str TEXT(123苹果); int32 ascii (int32)Source[4]; //数字代表序号 int32 ascii2 (int32)Source.GetCharArray()[4]; //或者第二种写法3.21 FString From Ascii/UnicodeFString str; int32 ascii 49; //1的ascii是49。 中文 中的编码是20013 str.AppendChar(Ascii); //如果ascii为20013转换出来时中四、FName4.1 FName To FStringFName str FName(TEXT(hello)); FString fstr str.ToString();4.2 FName To FTextFName str FName(TEXT(hello)); FText FText::FromName(str);五、FTextFText To FString//不可靠在一些语言中存在损耗 FString Name MyText.ToString();六、TChar*TChar* 与 char* 的互相转换主要是使用下面的四个宏定义。TCHAR_TO_ANSI(*str) ANSI_TO_TCHAR(*str) TCHAR_TO_UTF8(*str) UTF8_TO_TCHAR(*str)七、std::stringstd::string To FString#include string ​ std::string MyStdString Happy; FString HappyString(UTF8_TO_TCHAR(MyStdString.c_str())); //可防止string的中文转换出错To string函数c11标准增加了全局函数std::to_string: string to_string (int val); string to_string (long val); string to_string (long long val); string to_string (unsigned val); string to_string (unsigned long val); string to_string (unsigned long long val); string to_string (float val); //只能精确到小数点后6位 string to_string (double val); //只能精确到小数点后6位 string to_string (long double val);string To函数string To intstd::string str 123; int n atoi(str.c_str()); coutn; //123double-string//有效位数20位 ---据说待考证 char buffer[100]; double b1245683.141592653; int ndight20;//有效数字位数 gcvt(b,ndight,buffer); coutbufferendl; ​ //一般使用方法:只能精确到小数点后6位 #include string using namespace std; double d 3.1415926535897932384; string str std::to_string(d); cout str std::endl; // 3.141593 ​ //使用stringstream在输入流时使用setprecision设置精度需包含头文件 iomanip //精度保持到小数点后15位 #include iostream #include string #include sstream #include iomanip using namespace std; std::stringstream ss; ss setprecision(15) d; str ss.str(); cout str std::endl; // 3.14159265358979 ​ //对于double类型setprecision(15) 参数最大有效值为15超过15数据就不保证可靠了。string-doublestring str1245683.141592653; double numatof(str.c_str()); printf(%0.9lf\n,num);八、char*char* To FStringFString MyFString FString(UTF8_TO_TCHAR(MyCharPtr));九、UE4_JsonJsonObjectTo FString处理Json需要在.Build.cs中添加Json模块PrivateDependencyModuleNames.AddRange( new string[] { CoreUObject, Engine, Slate, SlateCore, Json, // ... add private dependencies that you statically link with here ... } );//Jdata转换为了JsonStr FString JsonStr; TSharedRefTJsonWriter Writer TJsonWriterFactory::Create(JsonStr); FJsonSerializer::Serialize(Jdata.ToSharedRef(), Writer);