String Conversions: FString to FName, FString to Int32, Float to FString - Epic Wiki

String Conversions: FString to FName, FString to Int32, Float to FString

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Contents

• 1 Overview
• 2 Converting FString to FNames
• 3 std::string to FString
• 4 FCString Overview
  • 4.1 Converting FString to Numbers
  • 4.2 FString to Integer
  • 4.3 FString to Float
• 5 Float/Integer to FString
• 6 UE4 Source Header References

Overview

1. FString to FName
2. std::string to FString
3. FString and FCString Overview
4. FString to Integer
5. FString to Float
6. Float/Integer to FString
7. UE4 C++ Source Header References

All the header files I refer to in this tutorial are found in

your UE4 install directory / Engine / Source

you will probably want to do a search for them from this point 😃

Converting FString to FNames

Say we have

FString TheString = "UE4_C++_IS_Awesome";

To convert this to an FName you do:

FName ConvertedFString = FName(*TheString);

std::string to FString

#include   //....   some function { std::string TestString = "Happy"; FString HappyString(TestString.c_str()); }

FCString Overview

Converting FString to Numbers

The * operator on FStrings returns their TCHAR* data which is what FCString functions use.

If you cant find the function you want in FStrings (UnrealString.h) then you should check out the FCString functions (CString.h)

I show how to convert from FString to FCString below:

Say we have

FString TheString = "123.021";

FString to Integer

int32 MyShinyNewInt = FCString::Atoi(*TheString);

FString to Float

float MyShinyNewFloat = FCString::Atof(*TheString);

Note that Atoi and Atof are static functions, so you use the syntax FCString::TheFunction to call it 😃

Float/Integer to FString

FString NewString = FString::FromInt(YourInt);   FString VeryCleanString = FString::SanitizeFloat(YourFloat);

Static functions in the UnrealString.h 😃

UE4 Source Header References

CString.h UnrealString.h NameTypes.h

See CString.h for more details and other functions like

atoi64 (string to int64) Atod (string to double precision float)

For a great deal of helpful functions you will also want to look at

UnrealString.h for direct manipulation of FStrings!

For more info on FNames check out

NameTypes.h

Enjoy!

Rama (talk)

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