Launch QT App from Custom Protocol - Windows

 

This is called URL Protocol Handler and you were following the right path of modifying the registry. HKEY_CLASSES_ROOT in fact maps to either HKEY_LOCAL_MACHINE\Software\Classes (which can have issues with write access) and HKEY_CURRENT_USER\Software\Classes, we use the latter.

Note  : Ensure that Qt is compiled, and build the application using the release mode of Qt Creator, not the debug mode.

Here's the complete example that works:

 

	#include <QApplication>
	#include <QSettings>
	#include <QDir>
	int main(int argc, char *argv[]) {
	QApplication a(argc, argv);
	QString path = QDir::toNativeSeparators(qApp->applicationFilePath());
	QSettings set("HKEY_CURRENT_USER\\Software\\Classes", QSettings::NativeFormat);
	set.beginGroup("YourApp");
	set.setValue("Default", "URL:YourApp Protocol");
	set.setValue("DefaultIcon/Default", path);
	set.setValue("URL Protocol", "");
	set.setValue("shell/open/command/Default", QString("\"%1\"").arg(path) + " \"%1\"");
	set.endGroup();
	return 0;
	}

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