Python Get Win32 System DPI and Resolution
24 Mar 2017 | Python Win32I bumped into a problem when testing BingBest:
When performing unit test on my main PC, all things works fine; But at testing on other PCs, the resolution got by the screeninfo module is just not the same as the hardware. I once thought it may be caused by the different resolution of the testing PCs (Lenovo Y50, Surface Pro 4), but until today I tested with my X1 Carbon (5th gen), with a resolution of 1920x1080, the same as my main PC; The result shows it has a resolution of 1536x864. I started to wonder if it is caused by system DPI settings (which I changed this morning.)
Firstly, I tried with the pywin32 module:
import win32api
def get_screen_resolution():
return win32api.GetSystemMetrics(0), win32api.GetSystemMetrics(1)
But it failed to get the untransformed resolution.
Then I tried to get system DPI with win32print:
import win32print
def get_system_dpi():
hdc = win32gui.GetDC(0)
para_x = 88
para_y = 90
x_dpi = win32print.GetDeviceCaps(hdc, para_x)
y_dpi = win32print.GetDeviceCaps(hdc, para_y)
return x_dpi, y_dpi
But the return value were (96, 96), the default DPI of Windows.
Finally, at StackOverflow I found that Python is by default a “System DPI Aware” appliction; and with the help of the demo, I used the ctypes module to get the true values:
def get_screen_resolution():
user32 = ctypes.windll.user32
user32.SetProcessDPIAware()
return user32.GetSystemMetrics(0), user32.GetSystemMetrics(1)