XCreateWindow 在 CentOS 5.6 上失败并出现错误：BadValue
我使用以下代码为一些集成测试创建一个假窗口：
class CXWindowsClipboardTests
{
protected:
virtual void
SetUp()
{
m_display = XOpenDisplay(NULL);
int screen = DefaultScreen(m_display);
Window root = XRootWindow(m_display, screen);
XSetWindowAttributes attr;
attr.do_not_propagate_mask = 0;
attr.override_redirect = True;
attr.cursor = Cursor();
m_window = XCreateWindow(
m_display, root, 0, 0, 1, 1, 0, 0,
InputOnly, CopyFromParent,
CWDontPropagate | CWEventMask |
CWOverrideRedirect | CWCursor,
&attr);
}
virtual void
TearDown()
{
XDestroyWindow(m_display, m_window);
XCloseDisplay(m_display);
}
};
上面是原始代码的修改版本，以占用更少的空间（请参阅完整源代码）。
上面的代码在 CentOS 5.6 上间歇性失败，并出现以下错误：
X Error of failed request: BadValue
(integer parameter out of range for operation)
Major opcode of failed request: 1 (X_CreateWindow)
Value in failed request: 0x844b530
Serial number of failed request: 7
Current serial number in output stream: 8
那么，实际上有两个问题：
- 什么可能导致 XCreateWindow 在 CentOS 上以这种方式间歇性失败？
- 而且，我对 X 开发相当陌生，所以我不知道各种错误值的含义（例如失败请求中的值）或如何使用它们。有人可以为我简要解释一下这些吗？
I'm using the following code to create a fake window for some integration tests:
class CXWindowsClipboardTests
{
protected:
virtual void
SetUp()
{
m_display = XOpenDisplay(NULL);
int screen = DefaultScreen(m_display);
Window root = XRootWindow(m_display, screen);
XSetWindowAttributes attr;
attr.do_not_propagate_mask = 0;
attr.override_redirect = True;
attr.cursor = Cursor();
m_window = XCreateWindow(
m_display, root, 0, 0, 1, 1, 0, 0,
InputOnly, CopyFromParent,
CWDontPropagate | CWEventMask |
CWOverrideRedirect | CWCursor,
&attr);
}
virtual void
TearDown()
{
XDestroyWindow(m_display, m_window);
XCloseDisplay(m_display);
}
};
The above is a modified version of original code to take up less space (see full source code).
The above code fails intermittently on CentOS 5.6 with the following error:
X Error of failed request: BadValue
(integer parameter out of range for operation)
Major opcode of failed request: 1 (X_CreateWindow)
Value in failed request: 0x844b530
Serial number of failed request: 7
Current serial number in output stream: 8
So, two questions really:
- What could cause XCreateWindow to fail on CentOS intermittently in this way?
- And, I'm fairly new to X development, so I have no idea what the various error values mean (e.g. Value in failed request) or how to use them. Could someone briefly explain these for me?
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您正在使用
CWEventMask，但未初始化attr.event_mask。这可能是你的问题。 （由于该结构是在堆栈上创建的，因此它将在该字段中包含随机数据。）You're using the
CWEventMaskbut not initializingattr.event_mask. This could be your problem. (since the structure is created on stack, it'll contain random data in that field.)