How to open FileChooser dialog with high dpi in Console

Windows
1

I am learning how to play audio files by watching Tutorial: Build an audio player.
In a new Console juce project(I made), referring to the code of the tutorial, I made a FileChooser dialog.
However, the result is different from when I run the project file of the tutorial.
In the tutorial’s project, the FileChooser dialog runs at high dpi:

high dpi
high dpi1897×1190 123 KB

but, in my Console project, the FileChooser dialog runs at low dpi:

low dpi
low dpi1892×1190 235 KB

Why do I get these results?
Need additional settings?

+Additional questions
The callback lambda function is not executed.
Why?

using namespace std;
using namespace juce;

int main (int argc, char* argv[])
{
	system("chcp 65001");
	ScopedJuceInitialiser_GUI _SJI_GUI;

	auto chooser = make_unique<FileChooser>("Select a Wave file to play...",
		juce::File{},
		"*.wav");
	auto chooserFlags = juce::FileBrowserComponent::openMode
		| juce::FileBrowserComponent::canSelectFiles;

	chooser->launchAsync(chooserFlags, [](const FileChooser& fc)
	{
		cout << "---------" << endl;
		auto file = fc.getResult();
		cout << file.getFileName() << endl;
		DBG("message");
		
	});
	int ccc;
	cin >> ccc;
	return 0;
}
2

I think I found the answer to my Additional question.
After searching and studying all day, I found out that the lambda function is executed in the MessageManager.
I noticed the existence of runDispatchLoop and executed it in main(), but found that the main thread hangs.
I created a new Thread class (MainMessageThread) so that the runDispatchLoop function can be executed independently of the main thread.
Finally, the lambda function is executed.
If someone needs a message event in the console application, please refer to the code below.

class MainMessageThread : public juce::Thread
{
public:
    MainMessageThread() : Thread("MainMessageThread")
    {
        startThread();
        std::cout << (wait(1000) ? "MainMessageThread start" : "MainMessageThread fail") << std::endl;
    }
    ~MainMessageThread()
    {
        juce::MessageManager::getInstanceWithoutCreating()->stopDispatchLoop();
        stopThread(1000);
    }

    void run() override
    {
        juce::ScopedJuceInitialiser_GUI SJI_GUI;
        notify();
        juce::MessageManager::getInstance()->runDispatchLoop();
        std::cout << "MainMessageThread stop" << std::endl;
    }
};

int main (int argc, char* argv[])
{
    system("chcp 65001"); //UTF-8
    std::cout << "start main" << std::endl;
    MainMessageThread MMT; //An object that can handle message events independently of the main thread.

    std::unique_ptr<juce::FileChooser> chooser;
    juce::MessageManager::callAsync([&chooser]() {
        chooser = std::make_unique<juce::FileChooser>("Select a Wave file to play...",
            juce::File{},
            "*.wav");
        auto chooserFlags = juce::FileBrowserComponent::openMode | juce::FileBrowserComponent::canSelectFiles;

        chooser->launchAsync(chooserFlags, [](const juce::FileChooser& fc) {
            auto file = fc.getResult();
            std::cout << "lambda function" << std::endl;
        });
    });

    int wait;
    std::cin >> wait;
    return 0;
}

However, I wonder if this is the correct solution.
Can anyone answer this?

+Still not finding a solution to the main question.
Even a small hint is fine, please help me solve the problem.

3

I think I’ve found a solution to my main question.
Setting Project Properties > Configuration Properties > Manifest Tool > Input and Output > DPI Awareness > Per Monitor High Dpi Aware in Visual Studio solves the window dialog.
Other windows probably can be resolved with the Desktop::getInstance().setGlobalScaleFactor(DPI) function.
If you have a better way, please anytime to comment.

1 Like