GetDpiForMonitor

GetDpiForMonitor is a function in the Windows API that retrieves the dots per inch (DPI) for a specified monitor. DPI is a measure of the resolution of a display, indicating the number of pixels per inch. This function is particularly useful in applications that need to adapt their user interface to different display settings, ensuring that elements appear correctly scaled on monitors with varying DPI values.

The function is defined in the Shcore.h header file and is part of the Windows Shell Scaling API. It takes three parameters: a handle to the monitor, a DPI type, and a pointer to a variable that will receive the DPI value. The DPI type parameter specifies whether to retrieve the effective DPI or the raw DPI. Effective DPI takes into account any scaling settings applied by the system, while raw DPI provides the actual hardware resolution of the monitor.

GetDpiForMonitor is typically used in conjunction with other scaling-related functions, such as GetScaleFactorForMonitor, to ensure that applications render correctly on high-DPI displays. By using this function, developers can create more responsive and visually consistent applications across different display configurations.