FString not work well when containing Chinese characters

[mayaping]

I defined a function in my c++ class
FString UMyBlueprintFunctionLibrary::TestFString()
{
FString m = “你”;
return m;
}
Then I call this function in blueprint,and print the return value.It prints ?? rather than “你”.

[9KGameStudio]

This string literal you are passing cannot properly hold Chinese characters.

From https://docs.unrealengine.com/latest/INT/Programming/UnrealArchitecture/StringHandling/index.html

In general, you should be using the TEXT() macro when setting string variable literals. If you do not specify the TEXT() macro, your literal will be encoded using ANSI, which is highly limited in what characters it supports. Any ANSI literals being passed into FString need to undergo a conversion to TCHAR (native Unicode encoding), so it is more efficient to use TEXT().

You need to have the literal converted to wide characters otherwise it will try to parse it as a pure ansi string which will be invalid.

EDIT: so with an example:

FString m = TEXT(“你”);

[mayaping]

FString UMyBlueprintFunctionLibrary::TestFString(FString m)
{
return m;
}
If I call this function in blueprint and set the parameter of m as “你”,and print the return value.It prints ?? rather than “你”. How can i solve this problem?

[Paradox]

maya,

I think the FString data type can only contain ASCII / ASCI characters. You might need to do some encoding to produce the correct character type.

This document might help:

Character Encoding

• Paradox

[Anonymous_d69079b0d44958cd3dd73a5a736aed56]

楼主这个问题解决了吗

[Anonymous_22f547d62f00bac65c2343d67ba1c173]

       string UUtilityLib::GBKToUTF8(const string& strGBK)
{
	std::string strOutUTF8 = "";
	WCHAR* str1;
	int n = MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, NULL, 0);
	str1 = new WCHAR[n+1];
	memset(str1, 0, n * 2 + 2);
	MultiByteToWideChar(CP_ACP, 0, strGBK.c_str(), -1, str1, n);
	n = WideCharToMultiByte(CP_UTF8, 0, str1, -1, NULL, 0, NULL, NULL);
	char* str2 = new char[n+1];
	memset(str2, 0, n + 1);
	WideCharToMultiByte(CP_UTF8, 0, str1, -1, str2, n, NULL, NULL);
	strOutUTF8 = str2;
	delete[]str1;
	str1 = NULL;
	delete[]str2;
	str2 = NULL;
	return strOutUTF8;
}

      auto name = "mn名字";
	auto utf8=  UUtilityLib::GBKToUTF8(name);
	FString testName = UTF8_TO_TCHAR(utf8.c_str());