wjx0912

func makeCode() (code string) {
	code = strconv.Itoa(rand.New(rand.NewSource(time.Now().UnixNano())).Intn(899999) + 100000)
	return
}

wjx0912

package main

import (
	"fmt"
	"time"
)

func add(ch chan int) {
	for i := 0; i < 10; i++ {
		ch <- i

wjx0912

package main

import (
	"fmt"
	"time"
)

func add(ch chan int) {
	for i := 0; i < 10; i++ {
		ch <- i

wjx0912

func listHandler(w http.ResponseWriter, r *http.Request) {
    fileInfoArr, err := ioutil.ReadDir("./uploads")         
    check(err)
    locals := make(map[string]interface{})
    images := []string{}
    for _, fileInfo := range fileInfoArr {
        images = append(images, fileInfo.Name)
    }
    locals["images"] = images
    renderHtml(w, "list", locals)

wjx0912

std::vector<std::wstring> out_list;
boost::split(out_list, user_wstring1, boost::is_any_of(L" :;()[]<>,-+=/\\\r\n\t"), boost::token_compress_on);
if (2 != out_list.size())
	return;

int testvalue = _ttoi(out_list[0].c_str());

wjx0912

// send
PostMessage(MyhWnd, CWM_SOME_ERROR, 0, reinterpret_cast<LPARAM>(new string(the_exception.error_string)) );

// receive
LPARAM CMyDlg::OnMyMessage1(WPARAM, LPARAM lParam)  
{  
    // Put in shared_ptr so it is automatically destroyed.  
    shared_ptr<string> msg = reinterpret_cast<string*>(lParam);  
  
    // Do stuff with message  

wjx0912

// send
SendingMethod::SendMsgId( ... )  
{  
    ...  
  
    std::unique_ptr<MyParams> myParams( new MyParams(value1, value2, value3) );  
    if (PostThreadMessage(MSG_ID, 0, reinterpret_cast<LPARAM>(myParams.release())) {  
        myParams.release();　　　　// is postmessage failed  
    }  
  

wjx0912

char *buffer = (char *)malloc(len);  
  
std::shared_ptr<void> _free_ptr((void *)buffer, [](void *p){  
	free(p);  
});  

// 补充
// FILE *fp = fopen("filepath", "rw");
// use shared_ptr deleter do fclose(fp)

wjx0912

// 创建及获取元组内的对象  
std::tuple<double, std::string> tup1(3.14, "pi");  
auto tup2 = std::make_tuple("Hello World!", "abc", 3.14, 0);  
const char* data = std::get<1>(tup2);    // 得到abc  
double len = std::get<2>(tup2);        // 得到3.14  
  
// 拆箱：tie参数作为左值  
auto tup3 = std::make_tuple(3.14, 1, 'a');  
double a;  
int b;  

wjx0912

# 来自65010的请求转发到80
iptables -t nat -A PREROUTING -p tcp --dport 65010 -j REDIRECT --to-port 80

# 来自192.168.8.99的数据全部丢弃
iptables -A INPUT -s "192.168.8.99" -j DROP