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乐高机器人®组件 · App Inventor 2 中文网
...假设传感器类型已通过SetInputMode配置。
MessageRead 读取消息(mailbox)
从机器人上的邮箱（1-10）读取消息。
MessageWrite 写入消息(mailbox,message)
将消息写入机器人上的邮箱（1-10）。
PlaySoundFile 播放声音文件(fileName)
在机器人...
How to specify new GCC path for CMake
...
Do not overwrite CMAKE_C_COMPILER, but export CC (and CXX) before calling cmake:
export CC=/usr/local/bin/gcc
export CXX=/usr/local/bin/g++
cmake /path/to/your/project
make
The export only needs to be done once, the first time you configure the project, then those values will ...
Wrapping a C library in Python: C, Cython or ctypes?
...ped out, just trying to show you the gist of it):
from ctypes import *
d2xx = WinDLL('ftd2xx')
OK = 0
INVALID_HANDLE = 1
DEVICE_NOT_FOUND = 2
DEVICE_NOT_OPENED = 3
...
def openEx(serial):
serial = create_string_buffer(serial)
handle = c_int()
if d2xx.FT_OpenEx(serial, OPEN_BY_SERIAL...
Updating MySQL primary key
...e a single "alter table" statement to update the primary key.
alter table xx drop primary key, add primary key(k1, k2, k3);
To fix things:
create table fixit (user_2, user_1, type, timestamp, n, primary key( user_2, user_1, type) );
lock table fixit write, user_interactions u write, user_interac...
程序员才能听得懂的笑话 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...家里也有台电脑？CPU是什么型号的？”
13、北京程序员xx遭遇车祸成植物人，医生说活下来希望只有万分之一，唤醒更为渺茫。他的Leader和亲人没放弃，他们根据xx视工作如命的作风，每天都在他身边念：“xx！IE6侧边栏又乱了...
403 Forbidden vs 401 Unauthorized HTTP responses
...----
401 | |
403 NO | | YES
3xx v v
401 +-----------------------
(404 no reveal) | CAN ACCESS RESOURCE ? (permission, authorized, ...)
or +-----------------------
...
surface plots in matplotlib
... nv = 50
u = np.linspace(0, 2*np.pi, nu,)
v = np.linspace(0, np.pi, nv,)
xx = np.zeros((nu,nv),dtype='d')
yy = np.zeros((nu,nv),dtype='d')
zz = np.zeros((nu,nv),dtype='d')
# populate x,y,z arrays
for i in range(nu):
for j in range(nv):
xx[i,j] = np.sin(v[j])*np.cos(u[i])
yy[i,j] = np.si...
URL Fragment and 302 redirects
...nts from Section 7.1.2. Location:
If the Location value provided in a 3xx (Redirection) response does
not have a fragment component, a user agent MUST process the
redirection as if the value inherits the fragment component of the URI
reference used to generate the request target (i.e., the...
MFC CListCtrl使用方法详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
... 得到单击的listctrl的行列号
添加listctrl控件的NM_CLICK消息相应函数
void CTest6Dlg::OnClickList1(NMHDR* pNMHDR, LRESULT* pResult)
{
// 方法一：
/*
DWORD dwPos = GetMessagePos();
CPoint point( LOWORD(dwPos),...
你真的了解熊市有多么可怕吗？ - 创意 - 清泛网 - 专注C/C++及内核技术
...倒了吗，我开户的大鹏证券就倒闭了。我是在报纸上看到消息的，赶紧联系证券公司，好在长江证券接手，资金没有损失，不过要重新过户。
印象不深了，开始跌的急，大家都不愿撤退，后来阴跌了，没办法，都不怎么关注了...