How to Determine the Current Screen Resolution Using WinAPI?

How to Ascertain Current Screen Resolution through Winapi

Determining the current screen resolution through Winapi is a crucial step when creating a fullscreen OpenGL window that matches the desktop's dimensions. This ensures optimal display by leveraging the screen's native resolution.

Primary Monitor Resolution

Retrieving the primary monitor's resolution can be achieved using:

• GetSystemMetrics with SM_CXSCREEN and SM_CYSCREEN parameters
• GetDeviceCaps with HORZRES and VERTRES parameters

Combined Resolution of All Monitors

To obtain the combined resolution of all connected monitors, use:

• GetSystemMetrics with SM_CXVIRTUALSCREEN and SM_CYVIRTUALSCREEN parameters

Work Area Resolution

For the work area on the primary monitor (excluding the taskbar and docked bars):

• SystemParametersInfo with SPI_GETWORKAREA parameter

Specific Monitor Resolution

To calculate the resolution of a specific monitor (including the work area and screen):

• GetMonitorInfo function

Additional Tips

• Since monitors may not always begin at 0x0, it's essential to use MonitorFromWindow to determine the monitor on which your window resides and then call GetMonitorInfo to gather the precise resolution.

• To access low-level functionality or modify the resolution, employ the following functions:

  • EnumDisplayDevices
  • EnumDisplaySettings
  • ChangeDisplaySettings
  • GetDeviceCaps (provides color depth)

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