c-用于X显示的QDesktopWidget

我有一个X显示说：2.我想在给定的X上显示我的qt小部件
显示.该显示与主要显示不同.因此,除了主要显示(由环境变量DISPLAY设置)之外,我还想访问其他X显示.

我知道QDekstopWidget具有屏幕功能().这不是我想要的.一世
当我想直接使用
显示编号.

让我知道是否有这样做的方法.
更新：尝试过

#include<QApplication>
#include<QWidget>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xresource.h>


int main(int argc, char *argv[])
{
QApplication a(argc, argv);

Display* display = XOpenDisplay(":1");

XSynchronize(display, True);
//XSetErrorHandler(myErrorHandler);

Window x11root = XDefaultRootWindow(display);

int x = 0;
int y = 0;
unsigned int width = 500;
unsigned int height = 500;
unsigned int borderWidth = 0;
long colorBlue = 0xff0000ff;

Window x11w = XCreateSimpleWindow(display, x11root, x, y, 
    width, height, borderWidth, 1 /*magic number*/, colorBlue);
XMapWindow(display, x11w); // must be performed after XReparentWindow, 
                           // otherwise the window is not visible.

QWidget w;
w.resize(200,200);
w.show();

XReparentWindow(display, w.winId(), x11w, 0, 0);

return a.exec();

}

根据建议尝试了qscreen测试.它检测到显示,但是两个窗口都在显示：3

shiva@RSV-HP-ENVY-15-Notebook-PC:/tmp/korvins-qtbase-6226fcdc3e4ace4636c58778ef53fbf69f46c36e-6226fcdc3e4ace4636c58778ef53fbf69f46c36e/tests/manual/qscreen$./qscreen -platform xcb::3::5
qt.core.logging: Loading "/home/shiva/.config/QtProject/qtlogging.ini" ...
qt.qpa.screen: Output VGA-1-0 is not connected
qt.qpa.screen: Output HDMI-1-0 is not connected
qt.qpa.screen: adding QXcbScreen(0x1b82f60, name="eDP-1-0", geometry=1366x768+0+0, availableGeometry=1309x744+57+24, devicePixelRatio=1.0, logicalDpi=QPair(96.0,96.0), physicalSize=344.0x194.0mm, screenNumber=0, virtualSize=1366x768 (1366.0x768.0mm), orientation=Qt::ScreenOrientation(LandscapeOrientation), depth=24, refreshRate=59.0, root=2c1, windowManagerName="Compiz") (Primary: true )
qt.qpa.screen: primary output is "eDP-1-0"
qt.qpa.screen: connecting to additional display: "" "3"
qt.qpa.screen: adding QXcbScreen(0x1bae540, name="TurboVNC", geometry=1024x716+0+0, availableGeometry=1024x664+0+28, devicePixelRatio=1.0, logicalDpi=QPair(96.0,96.0), physicalSize=271.0x189.0mm, screenNumber=0, virtualSize=1024x716 (1024.0x716.0mm), orientation=Qt::ScreenOrientation(LandscapeOrientation), depth=24, refreshRate=60.0, root=6a, windowManagerName="Metacity") (Primary: true )
qt.qpa.screen: primary output is "TurboVNC"
qt.qpa.screen: connecting to additional display: "" "5"
qt.qpa.screen: adding QXcbScreen(0x1bd6ca0, name="TurboVNC", geometry=1024x716+0+0, availableGeometry=1024x664+0+28, devicePixelRatio=1.0, logicalDpi=QPair(96.0,96.0), physicalSize=271.0x189.0mm, screenNumber=0, virtualSize=1024x716 (1024.0x716.0mm), orientation=Qt::ScreenOrientation(LandscapeOrientation), depth=24, refreshRate=60.0, root=6a, windowManagerName="Metacity") (Primary: true ) 
qt.qpa.screen: primary output is "TurboVNC"
Xlib: extension "GLX" missing on display ":5".
Xlib: extension "GLX" missing on display ":5".
Xlib: extension "GLX" missing on display ":5".
Xlib: extension "GLX" missing on display ":5".
Could not initialize OpenGL for RasterGLSurface, reverting to RasterSurface.
Xlib: extension "GLX" missing on display ":5".
Xlib: extension "GLX" missing on display ":5".
Xlib: extension "GLX" missing on display ":5".
Xlib: extension "GLX" missing on display ":5".
Could not initialize OpenGL for RasterGLSurface, reverting to RasterSurface.
Xlib: extension "GLX" missing on display ":5".
Xlib: extension "GLX" missing on display ":5".
Xlib: extension "GLX" missing on display ":5".
Xlib: extension "GLX" missing on display ":5".
Could not initialize OpenGL for RasterGLSurface, reverting to RasterSurface. 

解决方法:

QX11Info可以访问X Display信息.参考：QX11Info::display()

我假设您需要打开第二个显示器的第二个X连接,并将其传递给新创建的小部件.

Here也是一些信息.

标签：xserver,linux,c-4,qt
来源： https://codeday.me/bug/20191119/2032854.html