NoPixScal125Pct.cpp

//#define WITH_DEBUG_CONSOLE

#ifndef UNICODE
# define UNICODE
#endif

#define WIN32_LEAN_AND_MEAN

#include <Windows.h>

#ifdef WITH_DEBUG_CONSOLE
# define _CRT_SECURE_NO_WARNINGS
# include <stdio.h>
#else
# define printf(...) do {} while (0)
#endif

int WINAPI wWinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE, _In_ PWSTR pCmdLine, _In_ int nCmdShow)
{
#ifdef WITH_DEBUG_CONSOLE
	if (AllocConsole()) {
		// WARNING: this might not work with cout
		// NOTE: the doc of the so called secure alternative freopen_s makes no sense
		freopen("CONOUT$", "wt", stdout);
	}
#endif

	HKEY hkey_desktop;
	LONG res;

	res = RegOpenKeyExW(HKEY_CURRENT_USER,
						L"Control Panel\\Desktop",
						0,
						KEY_SET_VALUE,
						&hkey_desktop);

	if (res == ERROR_SUCCESS) {
		DWORD DpiScalingVer_val = 0x00001018;
		res = RegSetValueExW(hkey_desktop,
							 L"DpiScalingVer",
							 0,
							 REG_DWORD,
							 (BYTE*)&DpiScalingVer_val,
							 sizeof(DWORD));
		if (res)
			printf("setting DpiScalingVer failed: %lx\n", res);

		DWORD Win8DpiScaling_val = 1;
		res = RegSetValueExW(hkey_desktop,
							 L"Win8DpiScaling",
							 0,
							 REG_DWORD,
							 (BYTE*)&Win8DpiScaling_val,
							 sizeof(DWORD));
		if (res)
			printf("setting Win8DpiScaling failed: %lx\n", res);

		DWORD LogPixels_val = 0x00000078;
		res = RegSetValueExW(hkey_desktop,
							 L"LogPixels",
							 0,
							 REG_DWORD,
							 (BYTE*)&LogPixels_val,
							 sizeof(DWORD));
		if (res)
			printf("setting LogPixels failed: %lx\n", res);

		res = RegCloseKey(hkey_desktop);
		if (res)
			printf("RegCloseKey() failed: %lx\n", res);

		printf("this is only a test, do not attempt to leave the dance floor!\n");
	} else {
		printf("RegOpenKeyEx() failed: %lx\n", res);
	}

	//Sleep(5000);
	return 0;
}