On Mon, 24 Jun 2002, Zhicong Liang wrote:
> Hi all:
> I am a newbie for XFREE86 programming, now I am doing something with
> XFree86 in my project(software design recovery)... Can someone give me some
> hints to start my XFree programming career :) .
> Here is what I need to do, it sounds simple......
> I run an application, this application pops up a window.
> 1.I have the process ID for this application, how can convert this
> process ID to the windowsID of X??(I can get that window id from xwininfo
> though..)
You can't. There is no correlation between the process ID and
the window ID. A process can create any number of windows and any
process can render to any window.
> 2.I want to capture the screenshot of a given window (ID), it is easy by
> using xwd. However, any api can help me capture the screenshot in my
> code(rather than doing system call for xwd?)
The Xlib function used to copy image data from a drawable to system
memory is XGetImage or XShmGetImage. It is very low-level though.
There may be other functions in toolkits based on Xlib, but I'm
not familiar with them.
Mark.
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