目录
基本数据类型
TCHAR：UE4通过对char和wchar_t的封装
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TCHAR就是UE4通过对char和wchar_t的封装
charANSI编码wchar_t宽字符的Unicode编码
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使用
TEXT()宏包裹作为字面值
TCHAR* TCharString = TEXT("Hello, World!");
// 引擎字符串(TCHAR*) -> ANSI字符串(char*)
char* CharString = TCHAR_TO_ANSI(TCharString);
// 引擎字符串(TCHAR*) -> std::string
std::string str = TCHAR_TO_UTF8(TCharString);
// 引擎字符串(TCHAR*) -> wchar_t*
wchar_t* WCharString = TCHAR_TO_WCHAR(TCharString);
// ANSI字符串(char*) -> 引擎字符串(TCHAR*)
TCHAR* TCharString1 = ANSI_TO_TCHAR(CharString);
// wchar_t* -> 引擎字符串(TCHAR*)
TCHAR* TCharString2 = UTF8_TO_TCHAR(WCharString);
TCHAR* TCharString3 = WCHAR_TO_TCHAR(WCharString);
FNames：常用作标识符等不变的字符串
常用作标识符等不变的字符串（如：资源路径/资源文件类型/骨骼名称/表格行名等）
- 比较字符串操作非常快
- 即使多个相同的字符串，也只在内存存储一份副本，避免了冗余的内存分配操作
- 不区分大小写
使用
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初始化
FName TestHUDName = FName(TEXT("ThisIsMyTestFName")); -
比较
CompareFloat = TestFName.Compare(OtherFName); -
搜索
if( FName(TEXT("pelvis"), FNAME_Find) != NAME_None ){} -
FString 与 FName 转换
TestHUDName = FName(*TestHUDString); TestHUDString = TestHUDName.ToString();
FText：静态字符串，处理文本本地化、UI 文本显示等
FText 是一种静态字符串，在UE4中可以负责处理文本本地化、UI 文本显示等
- 支持文本本地化
- 提高文本渲染的性能
- 较快的copy操作
使用
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FString <-> FText
TestHUDText = FText::FromString(TestHUDString); TestHUDString = TestHUDText.ToString(); -
FName -> FText
TestHUDText = FText::FromName(TestHUDName); -
比较
FString
初始化
FString str1("Hello!");
FString str2 = TEXT("Hello World!");
FString str3 = FString::Printf(TEXT("I am %d years old"), 18);
比较
if(MyFString.Equals(OtherFString, ESearchCase::CaseSensitive)){...} // 大小写敏感
if(MyFString.Equals(OtherFString, ESearchCase::IgnoreCase)){...}
if(MyFString == OtherFString){...}
拼接
FString str4 = TEXT("Hello World!");
str4 += FString("UE4");
float value = 1.0f;
FString str5 = FString::Printf(TEXT("Current Value: %f"),value);
分割
FString str6 = TEXT("Blueprint, C++, Material");
TArray<FString> strList;
str6.ParseIntoArray(strList, TEXT(","), true);FString 与其他类型字符串转换
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FString <-> int32/float
// FString -> int32/float FString TheString = "233"; int32 MyShinyNewInt = FCString::Atoi(*TheString); FString TheString = "233.3"; float MyStringtoFloat = FCString::Atof(*TheString); // int32/float -> FString FString NewString = FString::FromInt(233); FString NewString = FString::SanitizeFloat(233.3f); -
FString <-> TCHAR* 自动隐式转换
const FString MyFString; const TCHAR *TCharString = *MyFString; const FString MyFString=TCharString; -
FString → char *
// 1 char *plainText= TCHAR_TO_ANSI(*str); // 2 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()); -
FString <-> std::string
// FString -> std::string FString UE4Str = "Flowers"; std::string MyStdString(TCHAR_TO_UTF8(*UE4Str)); // std::string -> FString std::string TestString = "Happy"; FString HappyString(TestString.c_str()); -
FString <-> TArray
// FString -> TArray<uint8> FString JsonStr; TArray<uint8> content; content.SetNum(JsonStr.Len()); memcpy(content.GetData(), TCHAR_TO_ANSI(*JsonStr), JsonStr.Len()); //TArray<uint8> ****-> 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); -
FArrayReaderPtr -> FString
uint8 data[512]; FMemory::Memzero(data, 512); FMemory::Memcpy(data, ArrayReaderPtr->GetData(), ArrayReaderPtr->Num()); FString str = ((const char*)data); -
数值 -> 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 ); -
std::string <-> std::wstring
- WideCharToMultiByte
// std::wstring -> std::string
std::string WStringToString(const std::wstring wstr)
{
std::string str;
int len = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), wstr.size(), NULL, 0, NULL,NULL);
char*buffer = new char[len + 1];
WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), wstr.size(), buffer, len, NULL, NULL);
buffer[len] = '\0';
str.append(buffer);
delete[]buffer;
return str;
}
// std::string -> std::wstring
std::string str_path=TCHAR_TO_UTF8(*AppPath);
std::wstring wstr_path;
wstr_path.assign(str_path.begin(), str_path.end());