我创建了一个用于安装https://pypi.python.org/pypi/Adafruit-GPIO/1.0.3 python包的bitbake配方.以下是我的食谱
DESCRIPTION = "Library to provide a cross-platform GPIO interface on the Raspberry Pi and Beaglebone Black using the RPi.GPIO and Adafruit_BBIO libraries"
SECTION = "devel/python"
LICENSE = "CLOSED"
PR = "r1"
SRC_URI = "https://pypi.python.org/packages/db/1c/2dc8a674514219f287fa344e44cadfd77b3e2878d6ff602a8c2149b50dd8/Adafruit_GPIO-1.0.3.tar.gz"
inherit pypi setuptools
do_install_append() {
rm -f ${D}${libdir}/python*/site-packages/site.py*
}
do_compile_prepend() {
${STAGING_BINDIR_NATIVE}/python setup.py install ${DISTUTILS_BUILD_ARGS} || \
true
}
SRC_URI[md5sum] = "dfcdb1ba90188d18ba80b6d2958c8c33"
但每当我尝试咬食谱时,我总会收到以下错误
ERROR: Function failed: Fetcher failure for URL: 'https://pypi.python.org/packages/source/A/Adafruit-GPIO/Adafruit-GPIO-1.0.3.tar.gz'. Unable to fetch URL from any source
我的问题为什么当我在SRC_URI中有其他链接时,bitbake会尝试从其他链接下载？我怎样才能纠正我的食谱>
如何在超时时更改按钮文本？我尝试使用以下代码,但它无法正常工作.
private void button1_Click(object sender, EventArgs e)
{
Stopwatch sw = new Stopwatch();
sw.Start();
if (button1.Text == "Start")
{
//do something
button1.Text = "stop"
if (sw.ElapsedMilliseconds > 5000)
{
button1.Text = "Start";
}
}
我该如何更正我的代码？
我在串口上快速接收数据,而在其他线程中我正在处理串口上收到的数据包.因此,对于线程安全的读写操作,我使用concurrentqueue.以下是我在串行端口上接收数据的代码,我将其存储在concurrentqueue中.
System.Collections.Concurrent.ConcurrentQueue<byte> receivedData = new System.Collections.Concurrent.ConcurrentQueue<byte>();
private void receiveData(object sender, SerialDataReceivedEventArgs e)
{
while (connectComPort.BytesToRead > 0)
{
receivedData.Enqueue((byte)connectComPort.ReadByte());
}
}
以下是在后台线程中运行的concurrentqueue中处理数据的代码.
private void processBuffer()
{
while (1 == 1)
{
try
{
List<byte> storeData = new List<byte>();
if (startProcessState == 0)
{
storeData.Clear();
break;
}
if (receivedData.Count() > 7)
{
byte first = 0x00;
receivedData.TryPeek(out first);
if (startProcessState == 0)
{
storeData.Clear();
break;
}
if (first == 0x55)
{
first = 0x00;
receivedData.TryDequeue(out first);
storeData.Add(first);
receivedData.TryPeek(out first);
if (first …我正在为日期选择器使用以下示例代码
<html>
<head>
<!-- jQuery -->
<script type="text/javascript" src="https://code.jquery.com/jquery-1.11.3.min.js"></script>
<!-- Isolated Version of Bootstrap, not needed if your site already uses Bootstrap -->
<link rel="stylesheet" href="https://formden.com/static/cdn/bootstrap-iso.css" />
<!-- Bootstrap Date-Picker Plugin -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.4.1/js/bootstrap-datepicker.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-datepicker/1.4.1/css/bootstrap-datepicker3.css"/>
</head>
<body>
<div class="bootstrap-iso">
<div class="container-fluid">
<div class="row">
<div class="col-md-6 col-sm-6 col-xs-12">
<!-- Form code begins -->
<form method="post">
<div class="form-group"> <!-- Date input 1-->
<label class="control-label" for="date">Start Date</label>
<input class="form-control" id="date" name="date" placeholder="MM/DD/YYY" type="text"/>
</div>
<div class="form-group"> <!-- Date input 2--> …如何以最短和最有效的方法将各种字符串连接到字符串中.目前我正在以下列方式进行
string str1 = string.Format(BitConverter
.ToString(pass_packet, local_index + 511, 1) +
BitConverter.ToString(pass_packet, local_index + 510, 1) +
BitConverter.ToString(pass_packet, local_index + 509, 1) +
BitConverter.ToString(pass_packet, local_index + 508, 1) +
... + BitConverter.ToString(pass_packet, local_index + 400, 1));
我在表中有两列(groupID,memberID),我执行以下mysql查询
select `groupID` from `tbl_groupassign` where `memberID` = 'check1';
打印列groupID但我想在单行中显示groupID,每个groupID用逗号分隔.例如,我通过执行上面的查询得到以下结果
组ID
1组
第2组
但我希望将它显示为group1,group2