UE4中的字符串转换

虚幻4学习---UE4中的字符串转换(文章来自于UE4官方文档)


String Conversions: 

FString To FName

FString To Int32

Float To FString

FArrayReaderPtr To FString

TArray To FString

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

FString To TCHAR *

FString To Array

FString To FText (新增)

FText To FString (新增)

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());
}

FString to std::string

#include 
 
//....
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!

------------------------------------------------------------------------------

FArrayReaderPtr to FString

[cpp] view plain copy
  1. uint8 data[512];  
  2. FMemory::Memzero(data, 512);  
  3.   
  4. FMemory::Memcpy(data, ArrayReaderPtr->GetData(), ArrayReaderPtr->Num());  
  5. FString str = ((const char*)data);  

Array to FString

[cpp] view plain copy
  1. TArray content;  
  2. ...  
  3. const std::string cstr(reinterpret_cast<const char*>(content.GetData()), content.Num());  
  4. FString frameAsFString = cstr.c_str();  
  5. UE_LOG(VRSLog, Warning, TEXT("%s"), *frameAsFString);  


FString to char *  TCHAR_TO_ANSI()

[cpp] view plain copy
  1. int BP_GetColumnIndex(int resultSet, FString columnName)  
  2. {  
  3.     return GetColumnIndex(resultSet, TCHAR_TO_ANSI(*columnName));  
  4. }  
  5.     
  6. int GetColumnIndex(int iResult, const char* columnName)  
  7. {  
  8. }  



FString to TCHAR *

[cpp] view plain copy
  1. int BP_GetColumnIndex(int resultSet, FString columnName)  
  2. {  
  3.     return GetColumnIndex(resultSet, *columnName);  
  4. }  
  5.     
  6. int GetColumnIndex(int iResult, const TCHAR* columnName)  
  7. {  
  8. }  



FString To Array

[cpp] view plain copy
  1. FString StrData;  
  2. const TCHAR* StrPtr = *StrData;  
  3. FTCHARToUTF8 UTF8String(StrPtr);  
  4. int32 CTXSize = UTF8String.Length();  
  5.   
  6. TArray URLData;  
  7. URLData.SetNum(CTXSize);  
  8. memcpy(URLData.GetData(), UTF8String.Get(), CTXSize);  


FString To FText

[cpp] view plain copy
  1. FString Str = TEXT("str");  
  2. FText Text = FText::FromString(Str);  




FText To FString

[cpp] view plain copy
  1. FString Name = NameDesc->GetText().ToString(); 

你可能感兴趣的:(UE4)