To change the monitor resolution in Delphi, you can use the ChangeDisplaySettings function from the Windows API. This function allows you to change the display settings for the current desktop, including the screen resolution, color depth, and refresh rate.
Here is an example of how to use the ChangeDisplaySettings function to change the monitor resolution in Delphi
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uses Winapi.Windows; var DevMode: TDeviceMode; begin FillChar(DevMode, SizeOf(DevMode), 0); DevMode.dmSize := SizeOf(DevMode); DevMode.dmPelsWidth := 800; //Set the screen width to 800 pixels DevMode.dmPelsHeight := 600; //Set the screen height to 600 pixels DevMode.dmFields := DM_PELSWIDTH or DM_PELSHEIGHT; //Set the width and height fields ChangeDisplaySettings(DevMode, CDS_UPDATEREGISTRY); //Change the display settings end; |
In this example, the DevMode variable is a TDeviceMode record that holds the display settings. The dmSize, dmPelsWidth, and dmPelsHeight fields are used to specify the screen resolution, and the dmFields field is used to indicate which fields in the TDeviceMode record are being set.
The ChangeDisplaySettings function takes two arguments the TDeviceMode record containing the new display settings, and a flag indicating how the display settings should be changed. In this example, the CDS_UPDATEREGISTRY flag is used to update the display settings in the registry so that they persist after the application closes.
Note that the ChangeDisplaySettings function requires the winuser.h header file and the user32.dll library to be included in your Delphi project.
It is important to note that the ChangeDisplaySettings function may not work on all systems, and it may require the user to confirm the change in display settings. It is recommended to use this function with caution, and to provide a way for the user to revert to the original display settings if necessary.
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