X11 - Xrandr給我假監視器

Question

我試圖找到所有監視器和它們的座標（寬度w，高度h，x原點/左上角最x和y原點/左上角最y），並使用此代碼，它在一些系統上運行良好。但在其他系統上，我得到錯誤和重複的條目。如果我測試顯示器是否鏡像，我是否能夠避免這些重複/虛假的顯示器條目？如何測試它的鏡像？

所以這是我的代碼：

// start - get all monitor resolutions 
var screen = XRRGetScreenResources(getXOpenDisplay(), getDefaultRootWindow(getXOpenDisplay())); 

var noutputs = screen.noutput; 

for (var i=noutputs-1; i>=0; i--) { 
    var info = XRRGetOutputInfo(getXOpenDisplay(), screen, screen.outputs[i]); 
    if (info.connection == RR_Connected) { 
     var ncrtcs = info.ncrtc; 
     for (var j=ncrtcs-1; j>=0; j--) { 
      var crtc_info = XRRGetCrtcInfo(getXOpenDisplay(), screen, infoCrtcs[j]); 
      console.info('screen #' + i + ' mon#' + j + ' details:', crtc_info.x, crtc_info.y, crtc_info.width, crtc_info.height); 

      collMonInfos.push({ 
       x: crtc_info.x, 
       y: crtc_info.y, 
       w: crtc_info.width, 
       h: crtc_info.height 
      }); 

      XRRFreeCrtcInfo(crtc_info); 
     } 
    } 
    XRRFreeOutputInfo(info); 
} 
XRRFreeScreenResources(screen); 
console.info('JSON:', JSON.stringify(collMonInfos)); 
// end - get all monitor resolutions 

而這個輸出到日誌：

"screen #4 mon#0 details:" 0 0 0 0 
"screen #3 mon#1 details:" 0 0 1920 1200 
"screen #3 mon#0 details:" 1920 469 1366 768 
"screen #2 mon#1 details:" 0 0 1920 1200 
"screen #2 mon#0 details:" 1920 469 1366 768 
"screen #1 mon#1 details:" 0 0 1920 1200 
"screen #1 mon#0 details:" 1920 469 1366 768 
"screen #0 mon#1 details:" 0 0 1920 1200 
"screen #0 mon#0 details:" 1920 469 1366 768 

這是它的JSON格式：

[{ 
    "x": 0, 
    "y": 0, 
    "w": 0, 
    "h": 0 
}, { 
    "x": 0, 
    "y": 0, 
    "w": 1920, 
    "h": 1200 
}, { 
    "x": 1920, 
    "y": 469, 
    "w": 1366, 
    "h": 768 
}, { 
    "x": 0, 
    "y": 0, 
    "w": 1920, 
    "h": 1200 
}, { 
    "x": 1920, 
    "y": 469, 
    "w": 1366, 
    "h": 768 
}, { 
    "x": 0, 
    "y": 0, 
    "w": 1920, 
    "h": 1200 
}, { 
    "x": 1920, 
    "y": 469, 
    "w": 1366, 
    "h": 768 
}, { 
    "x": 0, 
    "y": 0, 
    "w": 1920, 
    "h": 1200 
}, { 
    "x": 1920, 
    "y": 469, 
    "w": 1366, 
    "h": 768 
}] 

我真的只有2顯示器，1920x1200一個和1366x768一個。如何進行所有其他條目以及如何測試以避免（而不是基於重複或0 h/w的回溯過濾掉）？

Answer 1

您不必要地遍歷每個輸出，然後通過每個監視器。所以你會收到重複的條目。您無需爲每個輸出調用XRRGetOutputInfo，因爲您需要的所有數據（監視器數量）都可以在由XRRGetScreenResources返回的結構中找到。 下面是可用的C代碼（至少對我來說）：

#include <stdio.h> 
#include <stdlib.h> 
#include <X11/Xlib.h> 
#include <X11/extensions/Xrandr.h> 

int main(void) { 
    Display *d = XOpenDisplay(getenv("DISPLAY")); 
    Window w = DefaultRootWindow(d); 
    XRRScreenResources *xrrr = XRRGetScreenResources(d, w); 
    XRRCrtcInfo *xrrci; 
    int i; 
    int ncrtc = xrrr->ncrtc; 
    for (i = 0; i < ncrtc; ++i) { 
     xrrci = XRRGetCrtcInfo(d, xrrr, xrrr->crtcs[i]); 
     printf("%dx%d+%d+%d\n", xrrci->width, xrrci->height, xrrci->x, xrrci->y); 
     XRRFreeCrtcInfo(xrrci); 
    } 
    XRRFreeScreenResources(xrrr); 
    return 0; 
}