The EnumDisplaySettingsEx function retrieves information about one of the graphics modes for a display device. To retrieve information for all the graphics modes for a display device, make a series of calls to this function.
This function differs from EnumDisplaySettings in that there is a dwFlags parameter.
BOOL EnumDisplaySettingsEx( _In_ LPCTSTR lpszDeviceName, _In_ DWORD iModeNum, _Out_ DEVMODE *lpDevMode, _In_ DWORD dwFlags );
- lpszDeviceName [in]
A pointer to a null-terminated string that specifies the display device about which graphics mode the function will obtain information.
- iModeNum [in]
Indicates the type of information to be retrieved. This value can be a graphics mode index or one of the following values.
Retrieve the current settings for the display device.
Retrieve the settings for the display device that are currently stored in the registry.
Graphics mode indexes start at zero. To obtain information for all of a display device's graphics modes, make a series of calls to EnumDisplaySettingsEx, as follows: Set iModeNum to zero for the first call, and increment iModeNum by one for each subsequent call. Continue calling the function until the return value is zero.
When you call EnumDisplaySettingsEx with iModeNum set to zero, the operating system initializes and caches information about the display device. When you call EnumDisplaySettingsEx with iModeNum set to a nonzero value, the function returns the information that was cached the last time the function was called with iModeNum set to zero.
- lpDevMode [out]
A pointer to a DEVMODE structure into which the function stores information about the specified graphics mode. Before calling EnumDisplaySettingsEx, set the dmSize member to sizeof (DEVMODE), and set the dmDriverExtra member to indicate the size, in bytes, of the additional space available to receive private driver data.
The EnumDisplaySettingsEx function will populate the dmFields member of the lpDevMode and one or more other members of the DEVMODE structure. To determine which members were set by the call to EnumDisplaySettingsEx, inspect the dmFields bitmask. Some of the fields typically populated by this function include:
- dwFlags [in]
This parameter can be the following value.
If the function succeeds, the return value is nonzero.
If the function fails, the return value is zero.
The function fails if iModeNum is greater than the index of the display device's last graphics mode. As noted in the description of the iModeNum parameter, you can use this behavior to enumerate all of a display device's graphics modes.
Minimum supported client
|Windows 2000 Professional [desktop apps only]|
Minimum supported server
|Windows 2000 Server [desktop apps only]|
Unicode and ANSI names
|EnumDisplaySettingsExW (Unicode) and EnumDisplaySettingsExA (ANSI)|
- Device Contexts Overview
- Device Context Functions