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POHow do I bring a processes window to the foreground on X Windows? (C++)
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copied!<p>I have the PID for the process (and the name), I want to bring it to the front on linux (ubuntu). On mac I would simply do <code>SetFrontProcess(pid)</code>, on windows I'd enumerate the windows, pick out the one I wanted, and call <code>SetWindowPos(hwnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);</code> but I'm at a loss of what to do on linux. I've looked at X Lib a bit, but most/all of those functions seem to operate on windows inside your process.</p> <hr> <p>Edit: Using bdk's answer I added these helpers to my code to get the Window</p> <pre><code>bool searchHelper(Display* display, Window w, Atom& atomPID, unsigned long pid, Window& result) { bool ret = false; Atom atomType; int format; unsigned long nItems; unsigned long bytesAfter; unsigned char* propPID = 0; if (Success == XGetWindowProperty(display,w,atomPID,0,1,False,XA_CARDINAL,&atomType,&format,&nItems,&bytesAfter,&propPID)) { if (propPID != 0) { if (pid == *((unsigned long *)propPID)) { result = w; ret = true; } XFree(propPID); } } if (ret) return ret; //we found we can stop //check the children of the window Window wRoot; Window wParent; Window *wChild=NULL; unsigned nChildren=0; if (XQueryTree(display, w, &wRoot, &wParent, &wChild, &nChildren) != 0 ) { for (unsigned i=0; i<nChildren; ++i) { ret = searchHelper(display, wChild[i], atomPID, pid, result); if (ret) break; } } return ret; } bool getWindowFromPid(unsigned long pid, Display* display, Window& result) { Window window = XDefaultRootWindow(display); Atom atomPID = XInternAtom(display, "_NET_WM_PID", true); if (atomPID == None) { qDebug("XInternAtom failure"); return false; } return searchHelper(display, window, atomPID, pid, result); } </code></pre> <p>Now I get the window successfully, but when I do the following</p> <pre><code>if (getWindowFromPid(pid,display,window)) { qDebug("Found window ID:%d", window); int result = XRaiseWindow(display,window); qDebug("XRaiseWindow returned:%d", result); } </code></pre> <p>XRaiseWindow returns 1 (BadRequest). The documentation for XRaiseWindow does not mention the return code of BadRequest being a possible result. I'm not sure what is wrong. Am I not allowed to call it for windows in a different process? Is this focus steeling prevention hampering me? Any thoughts?</p> <p>Edit edit:</p> <p>So looking at what xwininfo.c does when you call it with -frame I changed my code as follows based on bdk's suggestion.</p> <pre><code>if (getWindowFromPid(pid,display,window)) { qDebug("Found window ID:%d", window); //Need the windowmanger frame (or parent) id not window id Window root, parent; Window *childlist; unsigned int ujunk; int status = XQueryTree(display, window, &root, &parent, &childlist, &ujunk); if (status && parent && parent != root) { qDebug("Found frame window ID:%d",parent); window = parent; } XSetWindowAttributes xswa; xswa.override_redirect=True; int result = XChangeWindowAttributes (display,window,CWOverrideRedirect,&xswa); qDebug("XChangeWindowAttributes returned:%d", result); result = XRaiseWindow(display,window); qDebug("XRaiseWindow returned:%d", result); } else qDebug("unable to find the window for the pid"); </code></pre> <p>At this point I do find the window frame ID, but I get a return code of "1" from both XChangeWindowAttributes and XRaiseWindow. Am I just not allowed to modify another process' window?</p>

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