我刚开始在C中使用Graphics,我在运行绘制同心圆的简单程序时遇到了这个错误:
user@user:~/Documents/C$ gcc circle.c -lX11 -lgraph
user@user:~/Documents/C$ ./a.out
[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that. a.out: ../../src/xcb_io.c:274: poll_for_event:
Assertion '!xcb_xlib_threads_sequence_lost' failed.
Aborted (core dumped)
和
[xcb] Unknown sequence number while processing queue
[xcb] Most likely this is a multi-threaded client and XInitThreads has not been called
[xcb] Aborting, sorry about that. a.out: ../../src/xcb_io.c:274: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed.
我在互联网上查找了一些论坛,他们建议在#include<X11/Xlib.h>
的开头添加XInitThreads()
并调用main()
可以解决问题,但我仍然可以获得运行时出现相同的错误。
我附上了代码:
#include<stdio.h>
#include<graphics.h>
#include<X11/Xlib.h>
int main()
{
XInitThreads();
int gd=DETECT, gm,r,x;
initgraph(&gd,&gm,NULL);
setbkcolor(WHITE);
setcolor(BLACK);
for(r=10;r<100;r+=10)
{
circle(150,150,r);
}
scanf("%d",&x);
closegraph();
return 0;
}
我使用Ubuntu 14.04和GCC进行编译。
答案 0 :(得分:3)
我在closegraph()
;
wait_for_char()
;
其中:
void wait_for_char()
{
//Wait for a key press
int in = 0;
while (in == 0) {
in = getchar();
}
}
这解决了问题,而无需致电XInitThreads()
。
不要问我为什么。但无论如何我用wait_for_key()
给我时间看!