虛幻4學習---UE4中的字符串轉換(文章來自于UE4官方文檔)

String Conversions:?

FString To FName

FString To Int32

Float To FString

FArrayReaderPtr?To FString

TArray<uint8> To FString

FString To char * ?--- ?( ?TCHAR_TO_ANSI() ?)

FString To TCHAR *

FString To Array<uint8>

FString To FText?(新增)

FText?To?FString?(新增)

Overview

FString to FName

std::string to FString

FString and FCString Overview

FString to Integer

FString to Float

Float/Integer to FString

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

FString to std::string

#include <string>//.... FString UE4Str = "Flowers"; std::string MyStdString(TCHAR_TO_UTF8(*UE4Str));

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!

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FArrayReaderPtr to FString

[cpp] view plaincopy

uint8?data[512];??

FMemory::Memzero(data,?512);??

??

FMemory::Memcpy(data,?ArrayReaderPtr->GetData(),?ArrayReaderPtr->Num());??

FString?str?=?((const?char*)data);??

Array<uint8> to FString

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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);??

FString to char * ?TCHAR_TO_ANSI()

[cpp] view plaincopy

int?BP_GetColumnIndex(int?resultSet,?FString?columnName)??

{??

????return?GetColumnIndex(resultSet,?TCHAR_TO_ANSI(*columnName));??

}??

????

int?GetColumnIndex(int?iResult,?const?char*?columnName)??

{??

}??

FString to TCHAR *

[cpp] view plaincopy

int?BP_GetColumnIndex(int?resultSet,?FString?columnName)??

{??

????return?GetColumnIndex(resultSet,?*columnName);??

}??

????

int?GetColumnIndex(int?iResult,?const?TCHAR*?columnName)??

{??

}??

FString To?Array<uint8>

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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);??

FString To FText

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FString?Str?=?TEXT("str");??

FText?Text?=?FText::FromString(Str);??

FText?To?FString

[cpp] view plaincopy

FString?Name?=?NameDesc->GetText().ToString();?

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