DISPLAY_DEVICEA structure (wingdi.h)
The DISPLAY_DEVICE structure receives information about the display device specified by the iDevNum parameter of the EnumDisplayDevices function.
Syntax
typedef struct _DISPLAY_DEVICEA {
DWORD cb;
CHAR DeviceName[32];
CHAR DeviceString[128];
DWORD StateFlags;
CHAR DeviceID[128];
CHAR DeviceKey[128];
} DISPLAY_DEVICEA, *PDISPLAY_DEVICEA, *LPDISPLAY_DEVICEA;
Members
cb
Size, in bytes, of the DISPLAY_DEVICE structure. This must be initialized prior to calling EnumDisplayDevices.
DeviceName[32]
An array of characters identifying the device name. This is either the adapter device or the monitor device.
DeviceString[128]
An array of characters containing the device context string. This is either a description of the display adapter or of the display monitor.
StateFlags
Device state flags. It can be any reasonable combination of the following.
| Value | Meaning |
|---|---|
| DISPLAY_DEVICE_ACTIVE | DISPLAY_DEVICE_ACTIVE specifies whether a monitor is presented as being "on" by the respective GDI view. Windows Vista: EnumDisplayDevices will only enumerate monitors that can be presented as being "on." |
| DISPLAY_DEVICE_MIRRORING_DRIVER | Represents a pseudo device used to mirror application drawing for remoting or other purposes. An invisible pseudo monitor is associated with this device. For example, NetMeeting uses it. Note that GetSystemMetrics (SM_MONITORS) only accounts for visible display monitors. |
| DISPLAY_DEVICE_MODESPRUNED | The device has more display modes than its output devices support. |
| DISPLAY_DEVICE_PRIMARY_DEVICE | The primary desktop is on the device. For a system with a single display card, this is always set. For a system with multiple display cards, only one device can have this set. |
| DISPLAY_DEVICE_REMOVABLE | The device is removable; it cannot be the primary display. |
| DISPLAY_DEVICE_VGA_COMPATIBLE | The device is VGA compatible. |
DeviceID[128]
Not used.
DeviceKey[128]
Reserved.
Remarks
The four string members are set based on the parameters passed to EnumDisplayDevices. If the lpDevice param is NULL, then DISPLAY_DEVICE is filled in with information about the display adapter(s). If it is a valid device name, then it is filled in with information about the monitor(s) for that device.
Note
The wingdi.h header defines DISPLAY_DEVICE as an alias that automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows 2000 Professional [desktop apps only] |
| Minimum supported server | Windows 2000 Server [desktop apps only] |
| Header | wingdi.h (include Windows.h) |