How to use append in C++?

Development Programming & Scripting C++
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1

I’m trying to append the data table of a struct, I don’t know how… want to achieve the same as you can see in this blueprint graph.

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2

It is a simple FString::Append. So, similar code to that blueprint would be:

FString Str = HoldWeapon;
Str.Append("_");
Str.Append(Posture);
Str.Append("_");
Str.Append(MoveState);
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3

Thank You very much, You just solved the problem… I was trying to implement it using UKismet Library.

4

and the return value need to be converted to type Name and set to Data Table Row input

5

You can use UKismetStringLibrary::Conv_StringToName to convert FStringTo FName. Don’t forget to include Kismet/KismetStringLibrary.h.

FString Str = "smth";
FName Name = UKismetStringLibrary::Conv_StringToName(Str);
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6

So it is not possible to convert not using UKismet Library?

7

I think yes, it’s possible. Try to pass to FName constructor FString value (I don’t remember which is correct: FName(Str) or FName(*Str)).

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8

FString value(FName(*Str)); this works , so its mean now I have the return of the append is Str and I can set it to the (get data table by row) as connected in the bp graph ?

9

Well… I didn’t mean like this, just FName(*Str), but yes, append, cast to FName and there is a ready parameter for GetDataTableRow.
The full code example (you can write it in a different ways):

FString Str = HoldWeapon;
Str.Append("_");
Str.Append(Posture);
Str.Append("_");
Str.Append(MoveState);
FYourDataTableStructType* Data = YourDataTable->FindRow<FYourDataTableStructType>(FName(*Str), "");

(FindRow is a C++ version of blueprint GetDataTableRow)

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10

Thank You very very much for helping, still a little confusion, How to get the outerr row in which I have Forward and Other to set the walk speed.

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image_2022-05-04_2323116341193×326 82.8 KB 

	if (const UDataTable* DT_WalkSpeed{ LoadObject<UDataTable>(GetWorld(), TEXT("/Game/my data table")) })
	{
		if (const FST_WalkSpeed* Row { DT_WalkSpeed->FindRow<FST_WalkSpeed>(FName(*Str), "") })
		{
			if (MoveForwardAxis > 0.0f)
			{
				WalkSpeed = Forward;
			}
			else
			{
				WalkSpeed = Other;
			}
		}
	}
11

Function FindRow in sucsess return a pointer to structure. All you need to save this pointer (it’s
const FST_WalkSpeed* Row { DT_WalkSpeed->FindRow<FST_WalkSpeed>(FName(*Str), "") } in your code) and access the member of structure by operator -> (it’s because you have only pointer, not struct itself). So, try this:

if (const UDataTable* DT_WalkSpeed{ LoadObject<UDataTable>(GetWorld(), TEXT("/Game/my data table")) })
	{
		if (const FST_WalkSpeed* Row { DT_WalkSpeed->FindRow<FST_WalkSpeed>(FName(*Str), "") })
		{
			if (MoveForwardAxis > 0.0f)
			{
				WalkSpeed = Row->Forward;
			}
			else
			{
				WalkSpeed = Row->Other;
			}
		}
	}
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12

Thank You Sir very very much , You just solved my Problem and I really appreciate the time You have spent on this Issue to solve.
Really this is a big achievement , Thank You very much

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