Public Member Functions

# IDisplay Interface Reference

The IDisplay interface represents the virtual machine's display. More...

List of all members.

## Public Member Functions
void | getScreenResolution (in unsigned long screenId, out unsigned long width, out unsigned long height, out unsigned long bitsPerPixel)
| Queries display width, height and color depth for given screen.
void | setFramebuffer (in unsigned long screenId, in IFramebuffer framebuffer)
| Sets the framebuffer for given screen.
void | getFramebuffer (in unsigned long screenId, out IFramebuffer framebuffer, out long xOrigin, out long yOrigin)
| Queries the framebuffer for given screen.
void | setVideoModeHint (in unsigned long width, in unsigned long height, in unsigned long bitsPerPixel, in unsigned long display)
| Asks VirtualBox to request the given video mode from the guest.
void | setSeamlessMode (in boolean enabled)
| Enables or disables seamless guest display rendering (seamless desktop integration) mode.
void | takeScreenShot (in unsigned long screenId, in octetPtr address, in unsigned long width, in unsigned long height)
| Takes a screen shot of the requested size and copies it to the 32-bpp buffer allocated by the caller and pointed to by address.
void | takeScreenShotToArray (in unsigned long screenId, in unsigned long width, in unsigned long height,[retval] out octet[] screenData)
| Takes a guest screen shot of the requested size and returns it as an array of bytes in uncompressed 32-bit RGBA format.
void | takeScreenShotPNGToArray (in unsigned long screenId, in unsigned long width, in unsigned long height,[retval] out octet[] screenData)
| Takes a guest screen shot of the requested size and returns it as PNG image in array.
void | drawToScreen (in unsigned long screenId, in octetPtr address, in unsigned long x, in unsigned long y, in unsigned long width, in unsigned long height)
| Draws a 32-bpp image of the specified size from the given buffer to the given point on the VM display.
void | invalidateAndUpdate ()
| Does a full invalidation of the VM display and instructs the VM to update it.
void | resizeCompleted (in unsigned long screenId)
| Signals that a framebuffer has completed the resize operation.
void | completeVHWACommand (in octetPtr command)
| Signals that the Video HW Acceleration command has completed.

## Detailed Description

The IDisplay interface represents the virtual machine's display.

The object implementing this interface is contained in each IConsole::display attribute and represents the visual output of the virtual machine.

The virtual display supports pluggable output targets represented by the IFramebuffer interface. Examples of the output target are a window on the host computer or an RDP session's display on a remote computer.

Interface ID:
  `{09EED313-CD56-4D06-BD56-FAC0F716B5DD}`

## Member Function Documentation

void IDisplay::getScreenResolution | ( | in unsigned long | screenId,
|  | out unsigned long | width,
|  | out unsigned long | height,
|  | out unsigned long | bitsPerPixel |
| ) |  |  |

Queries display width, height and color depth for given screen.

void IDisplay::setFramebuffer | ( | in unsigned long | screenId,
|  | in IFramebuffer | framebuffer |
| ) |  |  |

Sets the framebuffer for given screen.

void IDisplay::getFramebuffer | ( | in unsigned long | screenId,
|  | out IFramebuffer | framebuffer,
|  | out long | xOrigin,
|  | out long | yOrigin |
| ) |  |  |

Queries the framebuffer for given screen.

void IDisplay::setVideoModeHint | ( | in unsigned long | width,
|  | in unsigned long | height,
|  | in unsigned long | bitsPerPixel,
|  | in unsigned long | display |
| ) |  |  |

Asks VirtualBox to request the given video mode from the guest.

This is just a hint and it cannot be guaranteed that the requested resolution will be used. Guest Additions are required for the request to be seen by guests. The caller should issue the request and wait for a resolution change and after a timeout retry.

Specifying `0` for either width, height or bitsPerPixel parameters means that the corresponding values should be taken from the current video mode (i.e. left unchanged).

If the guest OS supports multi-monitor configuration then the display parameter specifies the number of the guest display to send the hint to: `0` is the primary display, `1` is the first secondary and so on. If the multi-monitor configuration is not supported, display must be `0`.

Expected result codes:

  E_INVALIDARG | The display is not associated with any monitor.

void IDisplay::setSeamlessMode | ( | in boolean | enabled | ) |

Enables or disables seamless guest display rendering (seamless desktop integration) mode.

Note:
  Calling this method has no effect if IGuest::getFacilityStatus with facility `Seamless` does not return `Active`.

void IDisplay::takeScreenShot | ( | in unsigned long | screenId,
|  | in octetPtr | address,
|  | in unsigned long | width,
|  | in unsigned long | height |
| ) |  |  |

Takes a screen shot of the requested size and copies it to the 32-bpp buffer allocated by the caller and pointed to by address.

A pixel consists of 4 bytes in order: B, G, R, 0.

Expected result codes:

  E_NOTIMPL | Feature not implemented.
  VBOX_E_IPRT_ERROR | Could not take a screenshot.

Note:
  This API can be used only locally by a VM process through the COM/XPCOM C++ API as it requires pointer support. It is not available for scripting langages, Java or any webservice clients. Unless you are writing a new VM frontend use takeScreenShotToArray.

Warning:
  This method is non-scriptable. In particular, this also means that an attempt to call it from a process other than the process that has created and owns the object will most likely fail or crash your application.

void IDisplay::takeScreenShotToArray | ( | in unsigned long | screenId,
|  | in unsigned long | width,
|  | in unsigned long | height,
|  | [retval] out octet[] | screenData |
| ) |  |  |

Takes a guest screen shot of the requested size and returns it as an array of bytes in uncompressed 32-bit RGBA format.

A pixel consists of 4 bytes in order: R, G, B, 0xFF.

This API is slow, but could be the only option to get guest screenshot for scriptable languages not allowed to manipulate with addresses directly.

Parameters:

  | screenId | Monitor to take screenshot from.
  | width | Desired image width.
  | height | Desired image height.
  | screenData | Array with resulting screen data.

Expected result codes:

  E_NOTIMPL | Feature not implemented.
  VBOX_E_IPRT_ERROR | Could not take a screenshot.

void IDisplay::takeScreenShotPNGToArray | ( | in unsigned long | screenId,
|  | in unsigned long | width,
|  | in unsigned long | height,
|  | [retval] out octet[] | screenData |
| ) |  |  |

Takes a guest screen shot of the requested size and returns it as PNG image in array.

Parameters:

  | screenId | Monitor to take the screenshot from.
  | width | Desired image width.
  | height | Desired image height.
  | screenData | Array with resulting screen data.

Expected result codes:

  E_NOTIMPL | Feature not implemented.
  VBOX_E_IPRT_ERROR | Could not take a screenshot.

void IDisplay::drawToScreen | ( | in unsigned long | screenId,
|  | in octetPtr | address,
|  | in unsigned long | x,
|  | in unsigned long | y,
|  | in unsigned long | width,
|  | in unsigned long | height |
| ) |  |  |

Draws a 32-bpp image of the specified size from the given buffer to the given point on the VM display.

Parameters:

  | screenId | Monitor to take the screenshot from.
  | address | Address to store the screenshot to
  | x | Relative to the screen top left corner.
  | y | Relative to the screen top left corner.
  | width | Desired image width.
  | height | Desired image height.

Expected result codes:

  E_NOTIMPL | Feature not implemented.
  VBOX_E_IPRT_ERROR | Could not draw to screen.

Warning:
  This method is non-scriptable. In particular, this also means that an attempt to call it from a process other than the process that has created and owns the object will most likely fail or crash your application.

void IDisplay::invalidateAndUpdate | ( |  | ) |

Does a full invalidation of the VM display and instructs the VM to update it.

Expected result codes:

  VBOX_E_IPRT_ERROR | Could not invalidate and update screen.

void IDisplay::resizeCompleted | ( | in unsigned long | screenId | ) |

Signals that a framebuffer has completed the resize operation.

Expected result codes:

  VBOX_E_NOT_SUPPORTED | Operation only valid for external frame buffers.

void IDisplay::completeVHWACommand | ( | in octetPtr | command | ) |

Signals that the Video HW Acceleration command has completed.

Parameters:

  | command | Pointer to VBOXVHWACMD containing the completed command.

Warning:
  This method is non-scriptable. In particular, this also means that an attempt to call it from a process other than the process that has created and owns the object will most likely fail or crash your application.