linxu 线程独占CPU

2020/11/08 | 嵌入式笔记 | justchen | 暂无评论 | 1833 views

线程或进程独占CPU一般用来相对地提升实时性,但也不要指忘达到真正的实时操作系统的性能. 进程邦定CPU 我们通过系统调用sched_setaffinity进行绑定，通过sched_getaffinity获取绑定关系。注意这对方法是进程级别的绑定。代码中指定cpu0和cpu3，我们可以通过htop查看，两个cpu使用达到了100%，其他的……

qt network相关

2020/07/23 | QT | justchen | 暂无评论 | 2067 views

获取所有活动网卡

    int ipInc = 0;

    QStringList ipList;
    ipList.clear();

    QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses();
    QList<QNetworkInterface> ipDevList = QNetworkInterface::allInterfaces();

#ifdef Q_OS_ANDROID
    ipList << "Android Boardcast";
#endif

    for (int i = 0; i < ipDevList.size(); ++i) {
        bool ipReady = false;
        QList<QNetworkAddressEntry> tmpIPlist = ipDevList.at(i).addressEntries();


        // 排除所有未连接的网卡
        QNetworkInterface tmpNet = ipDevList.at(i);
        QNetworkInterface::InterfaceFlags interFlags;
        interFlags = tmpNet.flags();
        if(!((interFlags&QNetworkInterface::IsUp) &&
            (interFlags&QNetworkInterface::IsRunning) &&
            (interFlags&QNetworkInterface::CanBroadcast) &&
            (interFlags&QNetworkInterface::CanMulticast) &&
            !(interFlags&QNetworkInterface::IsLoopBack)))
        {
            continue;
        }

        QString tmpIp;
        for (int y=0; y<tmpIPlist.size(); ++y)
        {
            QNetworkAddressEntry xx = tmpIPlist.at(y);

            if (xx.ip() != QHostAddress::LocalHost && xx.ip().toIPv4Address() )
            {
                ipReady = true;
                tmpIp = xx.ip().toString();
                break;
            }
        }
        if( true == ipReady )
        {
            ipList << tmpIp + " (" + ipDevList.at(i).humanReadableName() + ")";
            if( tmpIp == lastUdpIp )
            {
                autoLinkIpSeqInList = ipInc;
            }
            ipInc++;
        }
    }
    qDebug() << "ipList:" << ipList;

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int ipInc = 0;

QStringList ipList;

ipList.clear();

QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses();

QList<QNetworkInterface> ipDevList = QNetworkInterface::allInterfaces();

#ifdef Q_OS_ANDROID

ipList << "Android Boardcast";

#endif

for (int i = 0; i < ipDevList.size(); ++i) {

bool ipReady = false;

QList<QNetworkAddressEntry> tmpIPlist = ipDevList.at(i).addressEntries();

// 排除所有未连接的网卡

QNetworkInterface tmpNet = ipDevList.at(i);

QNetworkInterface::InterfaceFlags interFlags;

interFlags = tmpNet.flags();

if(!((interFlags&QNetworkInterface::IsUp) &&

(interFlags&QNetworkInterface::IsRunning) &&

(interFlags&QNetworkInterface::CanBroadcast) &&

(interFlags&QNetworkInterface::CanMulticast) &&

!(interFlags&QNetworkInterface::IsLoopBack)))

{

continue;

}

QString tmpIp;

for (int y=0; y<tmpIPlist.size(); ++y)

{

QNetworkAddressEntry xx = tmpIPlist.at(y);

if (xx.ip() != QHostAddress::LocalHost && xx.ip().toIPv4Address() )

{

ipReady = true;

tmpIp = xx.ip().toString();

break;

}

if( true == ipReady )

{

ipList << tmpIp + " (" + ipDevList.at(i).humanReadableName() + ")";

if( tmpIp == lastUdpIp )

{

autoLinkIpSeqInList = ipInc;

}

ipInc++;

}

qDebug() << "ipList:" << ipList;

在TCP SERVER中获取CLIENT的IP及端口

//clientIP = tcpSocket->peerAddress().toString();  // 网上的这种方法不可用,会多出来一些字符
quint32 ipv4 = tcpSocket->peerAddress().toIPv4Address();
char xx[30];
sprintf(xx, "%d.%d.%d.%d",ipv4>>24,(ipv4>>16)&0xFF,(ipv4>>8)&0xFF ,ipv4&0xFF);
clientIP = xx;
clientPort = tcpSocket->peerPort();

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//clientIP = tcpSocket->peerAddress().toString(); // 网上的这种方法不可用,会多出来一些字符

quint32 ipv4 = tcpSocket->peerAddress().toIPv4Address();

char xx[30];

sprintf(xx, "%d.%d.%d.%d",ipv4>>24,(ipv4>>16)&0xFF,(ipv4>>8)&0xFF ,ipv4&0xFF);

clientIP = xx;

clientPort = tcpSocket->peerPort();

‘Access-Control-Allow-Origin’跨域问题解决 (vue axios)

2020/06/11 | node.js | justchen | 暂无评论 | 1844 views

在nodejs中使用AXIOS发送get请求到其他IP请求数据时,会报错Access-Control-Allow-Origin之类的错误. 要解决的需要前端与webserver端共同配合才行. 因为我的webserver是ARM板子,响应请求数据中HTTP HEAD信息只有HTTP/1.1 200 OK\n,这显然不够. 经过查找资料,增……

uboot下备份镜像

2020/04/22 | 海思 | justchen | 暂无评论 | 2425 views

当前仅适用于海思 1 、设置环境变量 setenv serverip 192.168.230.111 setenv ipaddr 192.168.230.124 sa ping 192.168.230.111 2、将要备份flash数据读入内存中 sf probe 0 sf read 82000000 100000 400000 s……

QT VirtualKeyboard 插件编译与使用

2020/02/19 | QT | justchen | 暂无评论 | 12199 views

编译安装正常情况下该插件都是需要自行编译的. 方法也简单得要死在QT源码中有qtvirtualkeyboard这样一个目录, 进入该目录然qmake对应的pro文件,生成makefile后make/make install就行了. qmake时需要加对应参数,比如 qmake ../ CONFIG+=”lang-en_GB lang-……

使用JavaScript对json数组的各种处理方法 filter map forEach..

2019/10/29 | node.js | justchen | 暂无评论 | 1718 views

filter方法介绍语法：array.filter(function(currentValue,index,arr), thisValue) 参数用处 function(currentValue,index,arr) 每个元素都回调用该方法 currentValue 必须。当前元素的值 index 可选。当前元素的索引值 arr 可选……

vue学习笔记

2019/10/24 | node.js | justchen | 暂无评论 | 1474 views

基本操作 js文件 <script src=”js/vue.js”></script> 就收工了.正式环境用 vue.min.js v-for对json数据的邦定当点击时某个按钮时，更改自已与其他对象的css

<div id="insource" class="col-xs-12">
    <hr>
    <span class="btn btn-app btn-sm btn-pink no-hover" v-for="abc in items">
        <P></P>
        <span class="line-height-1 smaller-90">{{ abc.alias }}</span>
        <p> <span class="line-height-1 smaller-60">{{ abc.id + ":" + abc.type }}</span> </p>
        <p> <span class="line-height-1 smaller-80">{{ abc.group }}</span> </p>
        <span class="badge badge-warning badge-left">电视墙</span>
    </span>
</div>

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<hr>

<P></P>

<span class="line-height-1 smaller-90">{{ abc.alias }}</span>

<p> <span class="line-height-1 smaller-80">{{ abc.group }}</span> </p>

</span>

</div>

[crayon-64266faedbb……

jQuery 学习笔记一

2019/10/14 | 未分类 | justchen | 暂无评论 | 1570 views

基本用法 get数据

function loadXMLDoc_justchen() {
    $.get("/action/led", function (data, status) {      //  GET 参数，回调函数(参数,状态)
        $("#NODE-SN").text(data);   // 查找到ID为NODE-SN的项目并将其更改为文本
        //console.log(data);
    });
}

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function loadXMLDoc_justchen() {

$.get("/action/led", function (data, status) { // GET 参数，回调函数(参数,状态)

$("#NODE-SN").text(data); // 查找到ID为NODE-SN的项目并将其更改为文本

//console.log(data);

});

}

当面页ready 后加载数据

$(document).ready(function () {
    loadXMLDoc_justchen();
});

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$(document).ready(function () {

loadXMLDoc_justchen();

});

定时刷新数据实际上就是加入 setInterval 方法 setInterval() 方法可按照指定的周期（以毫秒计）来调用函数或计算表达式。 setIn……

GoaHead 学习笔记

2019/10/14 | 嵌入式笔记 | justchen | 暂无评论 | 2600 views

初始化及基本流程

int goahdStart(void)
{
    char *argp, *auth, *home, *documents, *endpoints, *endpoint, *route, *tok, *lspec;
    int argind, duration;

    route = "route.txt";
    auth = "auth.txt";
    duration = 0;

    logSetPath("stdout:2");  // 打印

    documents = ME_GOAHEAD_DOCUMENTS;

    //initPlatform();
    if (websOpen(documents, route) < 0)
    {
        error("初始化WEB系统失败. Exiting.");
        return -1;
    }
    logHeader();
    if (websLoad(auth) < 0)
    {
        error("Cannot load %s", auth);
        return -1;
    }
    if (websListen("http://*:80") < 0)
    {
        return -1;
    }

    websDefineHandler("test", testHandler, nullptr, nullptr, 0);
    websAddRoute("/test", "test", 0);

    websDefineAction("exampleAction", (void*)exampleAction);

    if (websGetBackground()) {
        if (daemon(0, 0) < 0) {
            error("Cannot run as daemon");
            return -1;
        }
    }

    websServiceEvents(&finished);

    return 0;
}

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int goahdStart(void)

{

char *argp, *auth, *home, *documents, *endpoints, *endpoint, *route, *tok, *lspec;

int argind, duration;

route = "route.txt";

auth = "auth.txt";

duration = 0;

logSetPath("stdout:2"); // 打印

documents = ME_GOAHEAD_DOCUMENTS;

//initPlatform();

if (websOpen(documents, route) < 0)

{

error("初始化WEB系统失败. Exiting.");

return -1;

}

logHeader();

if (websLoad(auth) < 0)

{

error("Cannot load %s", auth);

return -1;

}

if (websListen("http://*:80") < 0)

{

return -1;

}

websDefineHandler("test", testHandler, nullptr, nullptr, 0);

websAddRoute("/test", "test", 0);

websDefineAction("exampleAction", (void*)exampleAction);

if (websGetBackground()) {

if (daemon(0, 0) < 0) {

error("Cannot run as daemon");

return -1;

}

websServiceEvents(&finished);

return 0;

}

goActions goActions定义

static void exampleAction(Webs *wp)
{
    const char *io_val;
    io_val = websGetVar(wp, "val_led", nullptr); // 获取POST过来的数据
    qDebug() << "on_led_set: " << io_val;

    websSetStatus(wp, 200);
    websWriteHeaders(wp, -1, nullptr);
    websWriteEndHeaders(wp);
    websWrite(wp, "%s", "<h4>hello GoAction!</h4>"); // 返回数据
    websDone(wp);
    return nullptr;
/****这句注册一个可以通过action/exampleGetAction访问的GoAction函数****/
websDefineAction("exampleAction", exampleGetAction);

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static void exampleAction(Webs *wp)

{

const char *io_val;

io_val = websGetVar(wp, "val_led", nullptr); // 获取POST过来的数据

qDebug() << "on_led_set: " << io_val;

websSetStatus(wp, 200);

websWriteHeaders(wp, -1, nullptr);

websWriteEndHeaders(wp);

websWrite(wp, "%s", "<h4>hello GoAction!</h4>"); // 返回数据

websDone(wp);

return nullptr;

/****这句注册一个可以通过action/exampleGetAction访问的GoAction函数****/

websDefineAction("exampleAction", exampleGetAction);

esxi 折腾记

2019/10/07 | 未分类 | justchen | 暂无评论 | 2075 views

启用VMRC或vmware workstation中的双向粘贴首先需要在客户机中安装vm tools,然后需要在虚拟机中的配置文件中增加两个值属性值 isolation.tools.copy.disable FALSE isolation.tools.paste.disable FALSE isolation.tools.setGU……

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