Here's the same code using a do-while loop instead:

```

#include <QDir>
#include <QFileInfo>
#include <QTextStream>
#include <QDebug>

int main(int argc, char *argv[])
{
// Set the directory path
QString directoryPath = "./";

// Create a QDir object with the given directory path
QDir directory(directoryPath);

// Filter the files to only show regular files
directory.setFilter(QDir::Files | QDir::NoSymLinks);

// Sort the files in alphabetical order, starting from upper letters
directory.setSorting(QDir::Name | QDir::Reversed);

// Get a list of all the files in the directory
QFileInfoList fileList = directory.entryInfoList();

// Initialize the loop counter
int i = 0;

// Loop through each file in the list using a do-while loop
do
{
    // Get the file info for the current file
    QFileInfo fileInfo = fileList.at(i);

    // Open the file for reading
    QFile file(fileInfo.filePath());
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        qDebug() << "Failed to open file:" << fileInfo.fileName();
        continue;
    }

    // Read the contents of the file
    QTextStream stream(&file);
    QString fileContents = stream.readAll();

    // Close the file
    file.close();

    // Print the contents of the file
    qDebug() << "File contents:" << fileContents;

    // Increment the loop counter
    i++;
} while (i < fileList.size());

return 0;

}
```
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