Blueprint for writing a txt file storing an array

Kenjimenschi · January 15, 2015, 9:18pm

Hello guys,

im on my Bachelor thesis and created a demo which i like to monitor.

My question is: I’ve got a 2DVector Array/list with position datas and like to save them to a txt/csv/whatever file is possible. Im searching an easy way to store this variables externally.

Thanks for your help!
Kenji

ScottSpadea · January 15, 2015, 9:36pm

in a blueprintFunctionLibrary, you can save a string in a txt file like this:

.h

#include "Engine.h" 
...

UFUNCTION(BlueprintCallable, Category = "Save")
	static bool FileSaveString(FString SaveTextB, FString FileNameB);

UFUNCTION(BlueprintPure, Category = "Save")
	static bool FileLoadString(FString FileNameA, FString& SaveTextA);

.cpp

bool UOmniBlueprintFunctionLibrary::FileSaveString(FString SaveTextB, FString FileNameB)
{
	return FFileHelper::SaveStringToFile(SaveTextB, *(FPaths::GameDir() + FileNameB));
}

bool UOmniBlueprintFunctionLibrary::FileLoadString(FString FileNameA, FString& SaveTextA)
{
	return FFileHelper::LoadFileToString(SaveTextA, *(FPaths::GameDir() + FileNameA));
}

saving as a .csv is the same as a text file, you just separate the values by commas in a concatenated string, and save it with a .csv extension

anonymous_user_17ec24a01 · January 15, 2015, 9:42pm

I don’t think UE4 Blueprints let you write to text files out of the box, but there’s been a big plugin library written that adds support for it. You will have to convert your array of points to a string and look for SaveStringTextToFile

(39) 's Extra Blueprint Nodes for You as a Plugin, No C++ Required! - Blueprint - Epic Developer Community Forums!

Xanitsu · September 14, 2016, 6:19pm

you could also use rama’s victory plugin it has that support for blueprints

emperor_katax · November 16, 2017, 9:36am

this works fine on my side with 4.17.2 … many thanks man … : ) ,

Vorsering · February 8, 2019, 1:13pm

I resolved this problem today. You can add this in every class

.h
//Save Directory is where i want to save the file, FinalString is What I want to save

UFUNCTION(BlueprintCallable, Category = “custom”, meta = (Keywords = “Save”))
static bool SaveText(FString SaveDirectory,FString FinalString);

.cpp
bool ABaseActor::SaveText(FString SaveDirectory,FString FinalString)
{
UE_LOG(LogTemp, Warning, TEXT(“Salvato in: %s”), *SaveDirectory); //where i’m saving the file
UE_LOG(LogTemp, Warning, TEXT(“TestoSalvato: %s”), *FinalString); //what i’m saving
return FFileHelper::SaveStringToFile(FinalString, *SaveDirectory); //Saving

}