UE4学习笔记（22）C++输出字符串及FString字符串转换
发表于2018-01-16
本篇文章将和大家介绍UE4中C++输出字符串和FString字符串转换，有不清楚的可以看看。
C++输出字符串
输出字符串到output log中
FString filePath
UE_LOG(LogTemp, Log, TEXT("%s"), *filePath);
UE_LOG(LogTemp, Error, TEXT("Hello,World!"));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));字符串转换
Converting FString to FNames
FString TheString = "UE4_C++_IS_Awesome"; FName ConvertedFString = FName(*TheString);
Converting std::string to FString
#include <string> //.... std::string TestString = "Happy"; FString HappyString(TestString.c_str());
Converting FString to std::string
#include <string> //.... FString UE4Str = "Flowers"; std::string MyStdString(TCHAR_TO_UTF8(*UE4Str));
数值转std::to_string
- std::string to_string( long value );
- std::string to_string( long long value );
- std::string to_string( unsigned value );
- std::string to_string( unsigned long value );
- std::string to_string( unsigned long long value );
- std::string to_string( float value );
- std::string to_string( double value );
- std::string to_string( long double value );
Converting FString to Integer
FString TheString = "123.021"; int32 MyShinyNewInt = FCString::Atoi(*TheString);
Converting FString to Float
FString TheString = "123.021"; int32 MyShinyNewInt = FCString::Atof(*TheString);
Converting Float/Integer to FString
FString NewString = FString::FromInt(YourInt); FString VeryCleanString = FString::SanitizeFloat(YourFloat);
UE4 Source Header References
CString.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)
更多关于FString的操作可以到UnrealString.h找到。
Converting FArrayReaderPtr to FString
uint8 data[512]; FMemory::Memzero(data, 512); FMemory::Memcpy(data, ArrayReaderPtr->GetData(), ArrayReaderPtr->Num()); FString str = ((const char*)data);
Converting Array to FString
TArray<uint8> content;
...
const std::string cstr(reinterpret_cast<const char*>(content.GetData()), content.Num());
FString frameAsFString = cstr.c_str();
UE_LOG(VRSLog, Warning, TEXT("%s"), *frameAsFString); Converting FString to Array
FString JsonStr; TArray<uint8> content; content.SetNum(JsonStr.Len()); memcpy(content.GetData(), TCHAR_TO_ANSI(*JsonStr), JsonStr.Len());
FString StrData; const TCHAR* StrPtr = *StrData; FTCHARToUTF8 UTF8String(StrPtr); int32 CTXSize = UTF8String.Length(); TArray<uint8> URLData; URLData.SetNum(CTXSize); memcpy(URLData.GetData(), UTF8String.Get(), CTXSize);
Converting FString to char *
///1
FString str
string t = TCHAR_TO_UTF8(*str);
char * returnvalue = (char *)malloc(sizeof(char) * (t.length() + 1));
strncpy_s(returnvalue, t.length() , t.c_str(), t.length());
///2
int ARPG_Database::BP_GetColumnIndex(int resultSet, FString columnName)
｛
return GetColumnIndex(resultSet, TCHAR_TO_ANSI(*columnName));
｝
int ARPG_Database::GetColumnIndex(int iResult, const char* columnName)
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｝Converting FString to const char *
const char *plainText= TCHAR_TO_ANSI(*aes_content);
Converting FString to TCHAR *
int ARPG_Database::BP_GetColumnIndex(int resultSet, FString columnName)
｛
return GetColumnIndex(resultSet, *columnName);
｝
int ARPG_Database::GetColumnIndex(int iResult, const TCHAR* columnName)
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｝Converting FString to FText
FString Str = TEXT("str");
FText Text = FText::FromString(Str);Converting FText to FString
FString Name = NameDesc->GetText().ToString();