I am using the below JAVA code to capture the desktop of a remote machine
Robot robot = new Robot();
BufferedImage screenShot = robot.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()));
ByteArrayOutputStream imageBytes = new ByteArrayOutputStream();
ImageIO.write(screenShot, "PNG", imageBytes);
return imageBytes.toByteArray();
However the captured image is blank, when the terminal session to the remote machine is either minimized or disconnected. I appreciate your help in resolving the issue, at the very least the minimized scenario.
Configuration: I have the same issues with a physical machine running windows 7 and a virtual machine running windows server 2008 R2.
More insights from MSDN:
Why you get black screen when you disconnect from RDP ? http://msdn.microsoft.com/en-us/library/aa383015%28VS.85%29.aspx
Here is my attempt to make things work, but none of the following did the trick:
How to get data when RDP window minimized ? You can force the RDP display driver to send data when minized, try these steps and let me know how it goes: 1) Add the following key HKEY_LOCAL_MACHINE\Software\Microsoft\Terminal Server Client\ Created a new DWORD value and named it RemoteDesktop_SuppressWhenMinimized. Specified 2 as the value data.
Note: Also tried adding the registry key to HKEY_LOCAL_MACHINE\Software\Wow6432Node\Microsoft\Terminal Server Client\ 2) Disable bitmap caching (http://technet.microsoft.com/en-us/library/cc737325(WS.10).aspx) In the Remote Desktop Connection window, click Options.
On the Experience tab, verify that the Bitmap caching check box is selected. Or