Author Archives: dmitriano

How I fixed wrong colors in my QML app on Android

I removed android:theme from AndroidManifest.xml:

<activity android:name="net.geographx.MainActivity"
    android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation|mcc|mnc|density"
    android:label="@string/app_name"
    android:theme="@style/AppTheme"
    android:launchMode="singleTask"
    android:screenOrientation="portrait"
    android:exported="true">
    <!-- Splash screen -->
    <meta-data android:name="android.app.splash_screen_drawable" android:resource="@drawable/splash"/>
    <!-- Splash screen -->
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Checking my Binance API request logs

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Sending XRP with JavaScript

const read = require('read').read;
const send = require('./send');

async function asyncMain()
{
  const amount = await read({
    prompt: "Amount: "
  });

  const password = await read({
    prompt: "Password: ",
    silent: true,
    replace: "*" //optional, will print out an asterisk for every typed character 
  });

  // console.log("Amount: " + amount);
  // console.log("Your password: " + password);
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I nearly was margin called on Binance

UNFI/USDT grown in 280% and I nearly was margin called:

but, fortunately, I earned $30.

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Viewing image metadata on Ubuntu 22.04

sudo apt install imagemagick
identify -verbose my-image.jpg
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Make QML menu width fit the content

Found an implementation here and added two pixels:

import QtQuick
import QtQuick.Controls
import QtQuick.Layouts

Menu {
    width: {
        var result = 0;
        var padding = 0;
        for (var i = 0; i < count; ++i) {
            var item = itemAt(i);
            result = Math.max(item.contentItem.implicitWidth, result);
            padding = Math.max(item.padding, padding);
        }
        // It looks like two pixels are missing to remove the ellipsis.
        // My first idea was that it is leftInset + rightInset, but it does not work.
        var missing = 2;
        return result + padding * 2 + missing;
    }
}
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Converting MP4 to GIF with ffmpeg

I was able to convert MP4 to GIF with ffmpeg with the following commands on Ubuntu 22.04:

ffmpeg \
  -i iphone884.mp4 \
  -r 15 \
  -vf "scale=512:-1,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
  -ss 00:00:03 -to 00:00:06 \
  iphone884.gif

ffmpeg \
  -i iphone884.mp4 \
  -r 15 \
  -vf "scale=300:-1,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
  iphone884.gif

Move assignment operator in C++

Implicitly-declared move assignment operator

If no user-defined move assignment operators are provided for a class type, and all of the following is true:

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Earned $50 on Binance with my Trading Bot

I have a home made Trading Bot that short coins on Binance with some simple strategy:

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Examples of C++/Objective-C interop

From QT’s Purchasing:

//SKProductsRequestDelegate
-(void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
    NSArray<SKProduct *> *products = response.products;
    SKProduct *product = [products count] == 1 ? [[products firstObject] retain] : nil;

    if (product == nil) {
        //Invalid product ID
        NSString *invalidId = [response.invalidProductIdentifiers firstObject];
        QMetaObject::invokeMethod(backend, "registerQueryFailure", Qt::AutoConnection, Q_ARG(QString, QString::fromNSString(invalidId)));
    } else {
        //Valid product query
        //Create a IosInAppPurchaseProduct
        IosInAppPurchaseProduct *validProduct = new IosInAppPurchaseProduct(product, backend->productTypeForProductId(QString::fromNSString([product productIdentifier])));
        if (validProduct->thread() != backend->thread()) {
            validProduct->moveToThread(backend->thread());
            QMetaObject::invokeMethod(backend, "setParentToBackend", Qt::AutoConnection, Q_ARG(QObject*, validProduct));
        }
        QMetaObject::invokeMethod(backend, "registerProduct", Qt::AutoConnection, Q_ARG(IosInAppPurchaseProduct*, validProduct));
    }

    [request release];
}
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