Desktop auf den Kopf stellen?

[chris]

hi,

Zitat:

lpszDeviceName
[in] Pointer to a null-terminated string that specifies the display device whose graphics mode will change. Only display device names as returned by EnumDisplayDevices are valid. See EnumDisplayDevices for further information on the names associated with these display devices.

dann sollte es ja so klappen:

Delphi-Quellcode:

procedure TForm1.Button1Click(Sender: TObject);
var DisplayDevice: TDisplayDevice;
begin
  DisplayDevice.cb := sizeof(DisplayDevice);
  EnumDisplayDevices(nil, 0, DisplayDevice, 0);

  [..]
  ChangeDisplaySettingsEx(DisplayDevice.DeviceString, aDevMode, Handle, 0, nil); //.DeviceName
  [..]
end;

Klappt aber nicht

[edit]
kann ja auch nicht, bzw. tut es nicht das was wir wollen

Zitat:

dmOrientation
For printer devices only, selects the orientation of the paper. This member can be either DMORIENT_PORTRAIT (1) or DMORIENT_LANDSCAPE (2).

und:

Zitat:

dmDisplayOrientation
Windows XP: For display devices only, the orientation at which images should be presented. If DM_DISPLAYORIENTATION is not set, this member must be zero. If DM_DISPLAYORIENTATION is set, this member must be one of the following values Value Meaning
DMDO_DEFAULT The display orientation is the natural orientation of the display device; it should be used as the default.
DMDO_90 The display orientation is rotated 90 degrees (measured clockwise) from DMDO_DEFAULT.
DMDO_180 The display orientation is rotated 180 degrees (measured clockwise) from DMDO_DEFAULT.
DMDO_270 The display orientation is rotated 270 degrees (measured clockwise) from DMDO_DEFAULT.

[/edit]

[phlux]

Vielleicht aber auch nur vllt ist es nur für Handhelds vorbedacht

[scp]

Hier ist die offizielle Anlaufstelle denke ich, da steht

Zitat:

lpszDeviceName
[in] Pointer to a null-terminated string that specifies the display device whose graphics mode will change. Only display device names as returned by EnumDisplayDevices are valid. See EnumDisplayDevices for further information on the names associated with these display devices.
The lpszDeviceName parameter can be NULL. A NULL value specifies the default display device. The default device can be determined by calling EnumDisplayDevices and checking for the DISPLAY_DEVICE_PRIMARY_DEVICE flag.

Aber klappen tuts bei mir auch nicht.

EDIT: Der Fehler dürfte in der veralteten DevMode Struktur liegen, dmOrientation ist für Drucker, dmDisplayOrientation gibt es nur in der neuen Struktur, z.B. in der JEDI Win32 API JwaWinGDI.pas.

[paresy]

außerdem:

Zitat:

dmDisplayOrientation
Windows XP: For display devices only, the orientation at which images should be presented. If DM_DISPLAYORIENTATION is not set, this member must be zero. If DM_DISPLAYORIENTATION is set, this member must be one of the following values

WinXP only

[NicoDE]

Habe mal ein wenig rumgespielt, anbei (Delphi 6), vielleicht hilft es jemandem...
Bei mir kommt als Antwort immer 'unsupported' (bietet der Gfx-Treiber nicht an)...