unreal-generate-qrcode-texture.cpp

#include "QrCode.hpp" // from https://github.com/nayuki/QR-Code-generator
#include "ImageUtils.h" // from Unreal Engine (4.24)

/// <summary>Generates a QR code texture from a string.</summary>
/// <param name="parent">UE parent (required)</param>
/// <param name="string">String to encode</param>
UTexture2D* UWebBuzzers::GenerateQrCode(UObject* parent, FString string)
{    
    qrcodegen::QrCode qr = qrcodegen::QrCode::encodeText(TCHAR_TO_UTF8(*string), qrcodegen::QrCode::Ecc::LOW);

    uint8 size = qr.getSize();
    TArray<FColor> pixels;
    pixels.SetNumZeroed(size * size);

    FColor black = FColor::Black;
    FColor white = FColor::White;

    for (uint8 x = 0; x < size; x++)
    {
        for (uint8 y = 0; y < size; y++)
        {
            FColor color = qr.getModule(x, y) ? white : black;
            pixels[x + y * size] = color;
        }
    }

    UTexture2D* texture = UTexture2D::CreateTransient(size, size, EPixelFormat::PF_B8G8R8A8, "QRCode");
    void* data = texture->PlatformData->Mips[0].BulkData.Lock(LOCK_WRITE);
    FMemory::Memcpy(data, pixels.GetData(), size * size * 4);
    texture->PlatformData->Mips[0].BulkData.Unlock();
    texture->UpdateResource();

    texture->Filter = TextureFilter::TF_Nearest;

    return texture;
}

For everyone using a more updated version of Unreal engine, getting compilation errors on:
void* data = texture->PlatformData->Mips[0].BulkData.Lock(LOCK_WRITE);
Try using:
void* data = texture->PlatformData->Mips[0].BulkData.Lock(LOCK_READ_WRITE); instead.

How can i implement this? I have no idea what to do with it.

@BustGame feel free to reach out here: alexandru AT outofthebox-plugins.com and I can take a look if this still works in your version of Unreal.

@BustGame feel free to reach out here: alexandru AT outofthebox-plugins.com and I can take a look if this still works in your version of Unreal.

I have no idea how can i contact you through this page but i cant implement library from nayuki into unreal engine. Tried many methods and still can't found solution. Any suggestions?