ChangeDisplaySettings

ChangeDisplaySettings is a function in the Windows API that allows applications to modify display settings. It is part of the user32.dll library. This function can be used to change various aspects of the display, including screen resolution, color depth, and refresh rate.

The function takes a pointer to a DEVMODE structure as an argument, which contains the desired display settings. It can also take flags that specify how the settings should be applied. For example, a flag can indicate whether the changes should be permanent or temporary, and whether the display should be immediately updated.

When an application calls ChangeDisplaySettings, the operating system attempts to apply the requested settings. If the settings are valid and supported by the hardware, the display is updated accordingly. If the settings are invalid or not supported, the function returns an error code indicating the reason for failure.

Applications typically use ChangeDisplaySettings to configure the display for games, video playback, or other scenarios where specific display modes are required. It is important for developers to handle potential errors and provide a way for users to revert to previous settings if the new ones cause problems. Incorrectly using ChangeDisplaySettings can lead to a blank screen or other display issues.