XFetchName始终返回0 [英] XFetchName always returns 0
问题描述
有人可以告诉我我的代码有什么问题吗?
#include <X11/Xlib.h>
#include <stdio.h>
#include <stdarg.h>
int main( int argc, char* argv[] )
{
Display *display;
Window focus;
char *window_name;
int revert;
display = XOpenDisplay(NULL);
XGetInputFocus(display, &focus, &revert);
int ret = XFetchName(display, focus, &window_name);
printf("ret = %d\n", ret);
if (window_name) printf("Title = %s\n", window_name);
return 0;
}
谢谢.
您可以尝试使用 XFetchName 都说将返回WM_NAME属性，似乎它们彼此不同.有时，它们返回相同的名称.有时，只有XGetWMName返回名称.
您还可以使用xwininfo -root -tree获取所有窗口的名称，并将其与XFetchName和XGetWMName的结果进行比较.
此代码可以列出所有窗口，并打印窗口ID和XFetchName和XGetWMName的结果.您可以使用窗口ID在xwininfo -root -tree的输出中查找.
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
void enum_windows(Display* display, Window window, int depth) {
int i;
XTextProperty text;
XGetWMName(display, window, &text);
char* name;
XFetchName(display, window, &name);
for (i = 0; i < depth; i++)
printf("\t");
printf("id=0x%x, XFetchName=\"%s\", XGetWMName=\"%s\"\n", window, name != NULL ? name : "(no name)", text.value);
Window root, parent;
Window* children;
int n;
XQueryTree(display, window, &root, &parent, &children, &n);
if (children != NULL) {
for (i = 0; i < n; i++) {
enum_windows(display, children[i], depth + 1);
}
XFree(children);
}
}
int main() {
Display* display = XOpenDisplay(NULL);
Window root = XDefaultRootWindow(display);
enum_windows(display, root, 0);
}
以下是显示两个函数的结果可能不同的输出.
id=0x2c7, XFetchName="(no name)", XGetWMName="(null)"
id=0x400001, XFetchName="(no name)", XGetWMName="(null)"
id=0x800036, XFetchName="(no name)", XGetWMName="(null)"
id=0x1400001, XFetchName="(no name)", XGetWMName="c - XFetchName always returns 0 - Stack Overflow - Chromium"
id=0x1000001, XFetchName="terminator", XGetWMName="terminator"
id=0x1000002, XFetchName="(no name)", XGetWMName="(null)"
id=0x1200001, XFetchName="chromium", XGetWMName="chromium"
id=0x1200002, XFetchName="(no name)", XGetWMName="(null)"
这是xwininfo -root -tree的一部分输出，显示了这些窗口的名称.
xwininfo:窗口ID:0x2c7(根窗口)(没有名称)
Root window id: 0x2c7 (the root window) (has no name)
Parent window id: 0x0 (none)
29 children:
0x1200001 "chromium": ("chromium" "Chromium") 10x10+10+10 +10+10
1 child:
0x1200002 (has no name): () 1x1+-1+-1 +9+9
0x1000001 "terminator": ("terminator" "Terminator") 10x10+10+10 +10+10
1 child:
0x1000002 (has no name): () 1x1+-1+-1 +9+9
0x800036 (has no name): () 1364x741+0+25 +0+25
1 child:
0x1400001 "c - XFetchName always returns 0 - Stack Overflow - Chromium": ("Chromium" "Chromium") 1364x741+0+0 +1+26
0x400001 (has no name): () 10x10+-20+-20 +-20+-20
im trying to write a C code to get the title of the Active Window in my Linux System, but the Function XFetchName always returnes zero, i also tried XGetWMName, same result... but using xprop, i can see that there is a string in the "WM_NAME" property
can anyone tell me whats wrong with my code?
#include <X11/Xlib.h>
#include <stdio.h>
#include <stdarg.h>
int main( int argc, char* argv[] )
{
Display *display;
Window focus;
char *window_name;
int revert;
display = XOpenDisplay(NULL);
XGetInputFocus(display, &focus, &revert);
int ret = XFetchName(display, focus, &window_name);
printf("ret = %d\n", ret);
if (window_name) printf("Title = %s\n", window_name);
return 0;
}
thanks.
You can try using XGetWMName function. Although the discriptions of XGetWMName and XFetchName both say they will return the WM_NAME property, it seems that they are different from each other. Some times, they return the same name. Some times, only XGetWMName returns the name.
You can also use xwininfo -root -tree to get all the windows' name, and compare with the result of XFetchName and XGetWMName.
This code can list all the windows and print the window id and result of XFetchName and XGetWMName. You can use the window id to look up in the output of xwininfo -root -tree.
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
void enum_windows(Display* display, Window window, int depth) {
int i;
XTextProperty text;
XGetWMName(display, window, &text);
char* name;
XFetchName(display, window, &name);
for (i = 0; i < depth; i++)
printf("\t");
printf("id=0x%x, XFetchName=\"%s\", XGetWMName=\"%s\"\n", window, name != NULL ? name : "(no name)", text.value);
Window root, parent;
Window* children;
int n;
XQueryTree(display, window, &root, &parent, &children, &n);
if (children != NULL) {
for (i = 0; i < n; i++) {
enum_windows(display, children[i], depth + 1);
}
XFree(children);
}
}
int main() {
Display* display = XOpenDisplay(NULL);
Window root = XDefaultRootWindow(display);
enum_windows(display, root, 0);
}
Here's a piece of output showing that the result of two functions may be different.
id=0x2c7, XFetchName="(no name)", XGetWMName="(null)"
id=0x400001, XFetchName="(no name)", XGetWMName="(null)"
id=0x800036, XFetchName="(no name)", XGetWMName="(null)"
id=0x1400001, XFetchName="(no name)", XGetWMName="c - XFetchName always returns 0 - Stack Overflow - Chromium"
id=0x1000001, XFetchName="terminator", XGetWMName="terminator"
id=0x1000002, XFetchName="(no name)", XGetWMName="(null)"
id=0x1200001, XFetchName="chromium", XGetWMName="chromium"
id=0x1200002, XFetchName="(no name)", XGetWMName="(null)"
Here's a piece of the output of xwininfo -root -tree showing the name of these windows.
xwininfo: Window id: 0x2c7 (the root window) (has no name)
Root window id: 0x2c7 (the root window) (has no name)
Parent window id: 0x0 (none)
29 children:
0x1200001 "chromium": ("chromium" "Chromium") 10x10+10+10 +10+10
1 child:
0x1200002 (has no name): () 1x1+-1+-1 +9+9
0x1000001 "terminator": ("terminator" "Terminator") 10x10+10+10 +10+10
1 child:
0x1000002 (has no name): () 1x1+-1+-1 +9+9
0x800036 (has no name): () 1364x741+0+25 +0+25
1 child:
0x1400001 "c - XFetchName always returns 0 - Stack Overflow - Chromium": ("Chromium" "Chromium") 1364x741+0+0 +1+26
0x400001 (has no name): () 10x10+-20+-20 +-20+-20
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