How Can I Get the Screen Resolution Using WinAPI?

Obtaining Screen Resolution Using WinAPI

In WinAPI, several functions exist to determine the current screen resolution. The appropriate choice depends on the specific requirement.

Retrieving Display Size

• Primary Monitor: Use GetSystemMetrics(SM_CXSCREEN) and GetSystemMetrics(SM_CYSCREEN) to obtain the width and height of the primary monitor.
• All Monitors: GetSystemMetrics(SM_CXVIRTUALSCREEN) and GetSystemMetrics(SM_CYVIRTUALSCREEN) provide the combined resolution of all attached monitors.
• Work Area: SystemParametersInfo(SPI_GETWORKAREA) returns the resolution of the work area on the primary monitor, excluding areas occupied by toolbars and other controls.

Specific Monitor Resolution

To get the resolution of a specific monitor, use GetMonitorInfo. This function requires the handle to the monitor, which can be obtained using MonitorFromWindow.

Advanced Display Information

For low-level access or to modify display settings, WinAPI provides functions such as EnumDisplayDevices, EnumDisplaySettings, and ChangeDisplaySettings. These allow for retrieval of refresh rates, color depths, and modification of display settings.

Note: It's crucial to consider that monitors may not always start at the (0, 0) coordinate. To position a window correctly, determine the monitor it is on using MonitorFromWindow and then call GetMonitorInfo to get the monitor's resolution and offset.

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